/* * linux/drivers/block/floppy.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1993, 1994 Alain Knaff * Copyright (C) 1998 Alan Cox */ /* * 02.12.91 - Changed to static variables to indicate need for reset * and recalibrate. This makes some things easier (output_byte reset * checking etc), and means less interrupt jumping in case of errors, * so the code is hopefully easier to understand. */ /* * This file is certainly a mess. I've tried my best to get it working, * but I don't like programming floppies, and I have only one anyway. * Urgel. I should check for more errors, and do more graceful error * recovery. Seems there are problems with several drives. I've tried to * correct them. No promises. */ /* * As with hd.c, all routines within this file can (and will) be called * by interrupts, so extreme caution is needed. A hardware interrupt * handler may not sleep, or a kernel panic will happen. Thus I cannot * call "floppy-on" directly, but have to set a special timer interrupt * etc. */ /* * 28.02.92 - made track-buffering routines, based on the routines written * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus. */ /* * Automatic floppy-detection and formatting written by Werner Almesberger * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with * the floppy-change signal detection. */ /* * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed * FDC data overrun bug, added some preliminary stuff for vertical * recording support. * * 1992/9/17: Added DMA allocation & DMA functions. -- hhb. * * TODO: Errors are still not counted properly. */ /* 1992/9/20 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl) * modeled after the freeware MS-DOS program fdformat/88 V1.8 by * Christoph H. Hochst\"atter. * I have fixed the shift values to the ones I always use. Maybe a new * ioctl() should be created to be able to modify them. * There is a bug in the driver that makes it impossible to format a * floppy as the first thing after bootup. */ /* * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and * this helped the floppy driver as well. Much cleaner, and still seems to * work. */ /* 1994/6/24 --bbroad-- added the floppy table entries and made * minor modifications to allow 2.88 floppies to be run. */ /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more * disk types. */ /* * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger * format bug fixes, but unfortunately some new bugs too... */ /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write * errors to allow safe writing by specialized programs. */ /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks * by defining bit 1 of the "stretch" parameter to mean put sectors on the * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's * drives are "upside-down"). */ /* * 1995/8/26 -- Andreas Busse -- added Mips support. */ /* * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent * features to asm/floppy.h. */ /* * 1998/1/21 -- Richard Gooch -- devfs support */ /* * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting & * use of '0' for NULL. */ /* * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation * failures. */ /* * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives. */ /* * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were * being used to store jiffies, which are unsigned longs). */ /* * 2000/08/28 -- Arnaldo Carvalho de Melo * - get rid of check_region * - s/suser/capable/ */ /* * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no * floppy controller (lingering task on list after module is gone... boom.) */ /* * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix * requires many non-obvious changes in arch dependent code. */ /* 2003/07/28 -- Daniele Bellucci . * Better audit of register_blkdev. */ #define FLOPPY_SANITY_CHECK #undef FLOPPY_SILENT_DCL_CLEAR #define REALLY_SLOW_IO #define DEBUGT 2 #define DCL_DEBUG /* debug disk change line */ /* do print messages for unexpected interrupts */ static int print_unex = 1; #include #include #include #include #include #include #define FDPATCHES #include #include #include #include #include #include #include #include #include #include #include /* CMOS defines */ #include #include #include #include #include #include /* for invalidate_buffers() */ /* * PS/2 floppies have much slower step rates than regular floppies. * It's been recommended that take about 1/4 of the default speed * in some more extreme cases. */ static int slow_floppy; #include #include #include #include #include static int FLOPPY_IRQ = 6; static int FLOPPY_DMA = 2; static int can_use_virtual_dma = 2; /* ======= * can use virtual DMA: * 0 = use of virtual DMA disallowed by config * 1 = use of virtual DMA prescribed by config * 2 = no virtual DMA preference configured. By default try hard DMA, * but fall back on virtual DMA when not enough memory available */ static int use_virtual_dma; /* ======= * use virtual DMA * 0 using hard DMA * 1 using virtual DMA * This variable is set to virtual when a DMA mem problem arises, and * reset back in floppy_grab_irq_and_dma. * It is not safe to reset it in other circumstances, because the floppy * driver may have several buffers in use at once, and we do currently not * record each buffers capabilities */ static DEFINE_SPINLOCK(floppy_lock); static struct completion device_release; static unsigned short virtual_dma_port = 0x3f0; irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs); static int set_dor(int fdc, char mask, char data); static void register_devfs_entries(int drive) __init; #define K_64 0x10000 /* 64KB */ /* the following is the mask of allowed drives. By default units 2 and * 3 of both floppy controllers are disabled, because switching on the * motor of these drives causes system hangs on some PCI computers. drive * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if * a drive is allowed. * * NOTE: This must come before we include the arch floppy header because * some ports reference this variable from there. -DaveM */ static int allowed_drive_mask = 0x33; #include static int irqdma_allocated; #define LOCAL_END_REQUEST #define DEVICE_NAME "floppy" #include #include #include /* for the compatibility eject ioctl */ #include static struct request *current_req; static struct request_queue *floppy_queue; static void do_fd_request(request_queue_t * q); #ifndef fd_get_dma_residue #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA) #endif /* Dma Memory related stuff */ #ifndef fd_dma_mem_free #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size)) #endif #ifndef fd_dma_mem_alloc #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size)) #endif static inline void fallback_on_nodma_alloc(char **addr, size_t l) { #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA if (*addr) return; /* we have the memory */ if (can_use_virtual_dma != 2) return; /* no fallback allowed */ printk ("DMA memory shortage. Temporarily falling back on virtual DMA\n"); *addr = (char *)nodma_mem_alloc(l); #else return; #endif } /* End dma memory related stuff */ static unsigned long fake_change; static int initialising = 1; #define ITYPE(x) (((x)>>2) & 0x1f) #define TOMINOR(x) ((x & 3) | ((x & 4) << 5)) #define UNIT(x) ((x) & 0x03) /* drive on fdc */ #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */ #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2)) /* reverse mapping from unit and fdc to drive */ #define DP (&drive_params[current_drive]) #define DRS (&drive_state[current_drive]) #define DRWE (&write_errors[current_drive]) #define FDCS (&fdc_state[fdc]) #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags)) #define SETF(x) (set_bit(x##_BIT, &DRS->flags)) #define TESTF(x) (test_bit(x##_BIT, &DRS->flags)) #define UDP (&drive_params[drive]) #define UDRS (&drive_state[drive]) #define UDRWE (&write_errors[drive]) #define UFDCS (&fdc_state[FDC(drive)]) #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags)) #define USETF(x) (set_bit(x##_BIT, &UDRS->flags)) #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags)) #define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args) #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2) #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH) #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x))) /* read/write */ #define COMMAND raw_cmd->cmd[0] #define DR_SELECT raw_cmd->cmd[1] #define TRACK raw_cmd->cmd[2] #define HEAD raw_cmd->cmd[3] #define SECTOR raw_cmd->cmd[4] #define SIZECODE raw_cmd->cmd[5] #define SECT_PER_TRACK raw_cmd->cmd[6] #define GAP raw_cmd->cmd[7] #define SIZECODE2 raw_cmd->cmd[8] #define NR_RW 9 /* format */ #define F_SIZECODE raw_cmd->cmd[2] #define F_SECT_PER_TRACK raw_cmd->cmd[3] #define F_GAP raw_cmd->cmd[4] #define F_FILL raw_cmd->cmd[5] #define NR_F 6 /* * Maximum disk size (in kilobytes). This default is used whenever the * current disk size is unknown. * [Now it is rather a minimum] */ #define MAX_DISK_SIZE 4 /* 3984 */ /* * globals used by 'result()' */ #define MAX_REPLIES 16 static unsigned char reply_buffer[MAX_REPLIES]; static int inr; /* size of reply buffer, when called from interrupt */ #define ST0 (reply_buffer[0]) #define ST1 (reply_buffer[1]) #define ST2 (reply_buffer[2]) #define ST3 (reply_buffer[0]) /* result of GETSTATUS */ #define R_TRACK (reply_buffer[3]) #define R_HEAD (reply_buffer[4]) #define R_SECTOR (reply_buffer[5]) #define R_SIZECODE (reply_buffer[6]) #define SEL_DLY (2*HZ/100) /* * this struct defines the different floppy drive types. */ static struct { struct floppy_drive_params params; const char *name; /* name printed while booting */ } default_drive_params[] = { /* NOTE: the time values in jiffies should be in msec! CMOS drive type | Maximum data rate supported by drive type | | Head load time, msec | | | Head unload time, msec (not used) | | | | Step rate interval, usec | | | | | Time needed for spinup time (jiffies) | | | | | | Timeout for spinning down (jiffies) | | | | | | | Spindown offset (where disk stops) | | | | | | | | Select delay | | | | | | | | | RPS | | | | | | | | | | Max number of tracks | | | | | | | | | | | Interrupt timeout | | | | | | | | | | | | Max nonintlv. sectors | | | | | | | | | | | | | -Max Errors- flags */ {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0, 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" }, {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0, 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/ {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0, 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/ {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/ {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/ {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/ {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/ /* | --autodetected formats--- | | | * read_track | | Name printed when booting * | Native format * Frequency of disk change checks */ }; static struct floppy_drive_params drive_params[N_DRIVE]; static struct floppy_drive_struct drive_state[N_DRIVE]; static struct floppy_write_errors write_errors[N_DRIVE]; static struct timer_list motor_off_timer[N_DRIVE]; static struct gendisk *disks[N_DRIVE]; static struct block_device *opened_bdev[N_DRIVE]; static DECLARE_MUTEX(open_lock); static struct floppy_raw_cmd *raw_cmd, default_raw_cmd; /* * This struct defines the different floppy types. * * Bit 0 of 'stretch' tells if the tracks need to be doubled for some * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch' * tells if the disk is in Commodore 1581 format, which means side 0 sectors * are located on side 1 of the disk but with a side 0 ID, and vice-versa. * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical * side 0 is on physical side 0 (but with the misnamed sector IDs). * 'stretch' should probably be renamed to something more general, like * 'options'. Other parameters should be self-explanatory (see also * setfdprm(8)). */ /* Size | Sectors per track | | Head | | | Tracks | | | | Stretch | | | | | Gap 1 size | | | | | | Data rate, | 0x40 for perp | | | | | | | Spec1 (stepping rate, head unload | | | | | | | | /fmt gap (gap2) */ static struct floppy_struct floppy_type[32] = { { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */ { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */ { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */ { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */ { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */ { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */ { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */ { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */ { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */ { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */ { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */ { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */ { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */ { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */ { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */ { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */ { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */ { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */ { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */ { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */ { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */ { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */ { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */ { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */ { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */ { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */ { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */ { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */ { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */ { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */ { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */ { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */ }; #define NUMBER(x) (sizeof(x) / sizeof(*(x))) #define SECTSIZE (_FD_SECTSIZE(*floppy)) /* Auto-detection: Disk type used until the next media change occurs. */ static struct floppy_struct *current_type[N_DRIVE]; /* * User-provided type information. current_type points to * the respective entry of this array. */ static struct floppy_struct user_params[N_DRIVE]; static sector_t floppy_sizes[256]; static char floppy_device_name[] = "floppy"; /* * The driver is trying to determine the correct media format * while probing is set. rw_interrupt() clears it after a * successful access. */ static int probing; /* Synchronization of FDC access. */ #define FD_COMMAND_NONE -1 #define FD_COMMAND_ERROR 2 #define FD_COMMAND_OKAY 3 static volatile int command_status = FD_COMMAND_NONE; static unsigned long fdc_busy; static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); static DECLARE_WAIT_QUEUE_HEAD(command_done); #define NO_SIGNAL (!interruptible || !signal_pending(current)) #define CALL(x) if ((x) == -EINTR) return -EINTR #define ECALL(x) if ((ret = (x))) return ret; #define _WAIT(x,i) CALL(ret=wait_til_done((x),i)) #define WAIT(x) _WAIT((x),interruptible) #define IWAIT(x) _WAIT((x),1) /* Errors during formatting are counted here. */ static int format_errors; /* Format request descriptor. */ static struct format_descr format_req; /* * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc), * H is head unload time (1=16ms, 2=32ms, etc) */ /* * Track buffer * Because these are written to by the DMA controller, they must * not contain a 64k byte boundary crossing, or data will be * corrupted/lost. */ static char *floppy_track_buffer; static int max_buffer_sectors; static int *errors; typedef void (*done_f) (int); static struct cont_t { void (*interrupt) (void); /* this is called after the interrupt of the * main command */ void (*redo) (void); /* this is called to retry the operation */ void (*error) (void); /* this is called to tally an error */ done_f done; /* this is called to say if the operation has * succeeded/failed */ } *cont; static void floppy_ready(void); static void floppy_start(void); static void process_fd_request(void); static void recalibrate_floppy(void); static void floppy_shutdown(unsigned long); static int floppy_grab_irq_and_dma(void); static void floppy_release_irq_and_dma(void); /* * The "reset" variable should be tested whenever an interrupt is scheduled, * after the commands have been sent. This is to ensure that the driver doesn't * get wedged when the interrupt doesn't come because of a failed command. * reset doesn't need to be tested before sending commands, because * output_byte is automatically disabled when reset is set. */ #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } } static void reset_fdc(void); /* * These are global variables, as that's the easiest way to give * information to interrupts. They are the data used for the current * request. */ #define NO_TRACK -1 #define NEED_1_RECAL -2 #define NEED_2_RECAL -3 static int usage_count; /* buffer related variables */ static int buffer_track = -1; static int buffer_drive = -1; static int buffer_min = -1; static int buffer_max = -1; /* fdc related variables, should end up in a struct */ static struct floppy_fdc_state fdc_state[N_FDC]; static int fdc; /* current fdc */ static struct floppy_struct *_floppy = floppy_type; static unsigned char current_drive; static long current_count_sectors; static unsigned char fsector_t; /* sector in track */ static unsigned char in_sector_offset; /* offset within physical sector, * expressed in units of 512 bytes */ #ifndef fd_eject static inline int fd_eject(int drive) { return -EINVAL; } #endif /* * Debugging * ========= */ #ifdef DEBUGT static long unsigned debugtimer; static inline void set_debugt(void) { debugtimer = jiffies; } static inline void debugt(const char *message) { if (DP->flags & DEBUGT) printk("%s dtime=%lu\n", message, jiffies - debugtimer); } #else static inline void set_debugt(void) { } static inline void debugt(const char *message) { } #endif /* DEBUGT */ typedef void (*timeout_fn) (unsigned long); static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0); static const char *timeout_message; #ifdef FLOPPY_SANITY_CHECK static void is_alive(const char *message) { /* this routine checks whether the floppy driver is "alive" */ if (test_bit(0, &fdc_busy) && command_status < 2 && !timer_pending(&fd_timeout)) { DPRINT("timeout handler died: %s\n", message); } } #endif static void (*do_floppy) (void) = NULL; #ifdef FLOPPY_SANITY_CHECK #define OLOGSIZE 20 static void (*lasthandler) (void); static unsigned long interruptjiffies; static unsigned long resultjiffies; static int resultsize; static unsigned long lastredo; static struct output_log { unsigned char data; unsigned char status; unsigned long jiffies; } output_log[OLOGSIZE]; static int output_log_pos; #endif #define current_reqD -1 #define MAXTIMEOUT -2 static void __reschedule_timeout(int drive, const char *message, int marg) { if (drive == current_reqD) drive = current_drive; del_timer(&fd_timeout); if (drive < 0 || drive > N_DRIVE) { fd_timeout.expires = jiffies + 20UL * HZ; drive = 0; } else fd_timeout.expires = jiffies + UDP->timeout; add_timer(&fd_timeout); if (UDP->flags & FD_DEBUG) { DPRINT("reschedule timeout "); printk(message, marg); printk("\n"); } timeout_message = message; } static void reschedule_timeout(int drive, const char *message, int marg) { unsigned long flags; spin_lock_irqsave(&floppy_lock, flags); __reschedule_timeout(drive, message, marg); spin_unlock_irqrestore(&floppy_lock, flags); } #define INFBOUND(a,b) (a)=max_t(int, a, b) #define SUPBOUND(a,b) (a)=min_t(int, a, b) /* * Bottom half floppy driver. * ========================== * * This part of the file contains the code talking directly to the hardware, * and also the main service loop (seek-configure-spinup-command) */ /* * disk change. * This routine is responsible for maintaining the FD_DISK_CHANGE flag, * and the last_checked date. * * last_checked is the date of the last check which showed 'no disk change' * FD_DISK_CHANGE is set under two conditions: * 1. The floppy has been changed after some i/o to that floppy already * took place. * 2. No floppy disk is in the drive. This is done in order to ensure that * requests are quickly flushed in case there is no disk in the drive. It * follows that FD_DISK_CHANGE can only be cleared if there is a disk in * the drive. * * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet. * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on * each seek. If a disk is present, the disk change line should also be * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk * change line is set, this means either that no disk is in the drive, or * that it has been removed since the last seek. * * This means that we really have a third possibility too: * The floppy has been changed after the last seek. */ static int disk_change(int drive) { int fdc = FDC(drive); #ifdef FLOPPY_SANITY_CHECK if (jiffies - UDRS->select_date < UDP->select_delay) DPRINT("WARNING disk change called early\n"); if (!(FDCS->dor & (0x10 << UNIT(drive))) || (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) { DPRINT("probing disk change on unselected drive\n"); DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive), (unsigned int)FDCS->dor); } #endif #ifdef DCL_DEBUG if (UDP->flags & FD_DEBUG) { DPRINT("checking disk change line for drive %d\n", drive); DPRINT("jiffies=%lu\n", jiffies); DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80); DPRINT("flags=%lx\n", UDRS->flags); } #endif if (UDP->flags & FD_BROKEN_DCL) return UTESTF(FD_DISK_CHANGED); if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) { USETF(FD_VERIFY); /* verify write protection */ if (UDRS->maxblock) { /* mark it changed */ USETF(FD_DISK_CHANGED); } /* invalidate its geometry */ if (UDRS->keep_data >= 0) { if ((UDP->flags & FTD_MSG) && current_type[drive] != NULL) DPRINT("Disk type is undefined after " "disk change\n"); current_type[drive] = NULL; floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1; } /*USETF(FD_DISK_NEWCHANGE); */ return 1; } else { UDRS->last_checked = jiffies; UCLEARF(FD_DISK_NEWCHANGE); } return 0; } static inline int is_selected(int dor, int unit) { return ((dor & (0x10 << unit)) && (dor & 3) == unit); } static int set_dor(int fdc, char mask, char data) { register unsigned char drive, unit, newdor, olddor; if (FDCS->address == -1) return -1; olddor = FDCS->dor; newdor = (olddor & mask) | data; if (newdor != olddor) { unit = olddor & 0x3; if (is_selected(olddor, unit) && !is_selected(newdor, unit)) { drive = REVDRIVE(fdc, unit); #ifdef DCL_DEBUG if (UDP->flags & FD_DEBUG) { DPRINT("calling disk change from set_dor\n"); } #endif disk_change(drive); } FDCS->dor = newdor; fd_outb(newdor, FD_DOR); unit = newdor & 0x3; if (!is_selected(olddor, unit) && is_selected(newdor, unit)) { drive = REVDRIVE(fdc, unit); UDRS->select_date = jiffies; } } /* * We should propagate failures to grab the resources back * nicely from here. Actually we ought to rewrite the fd * driver some day too. */ if (newdor & FLOPPY_MOTOR_MASK) floppy_grab_irq_and_dma(); if (olddor & FLOPPY_MOTOR_MASK) floppy_release_irq_and_dma(); return olddor; } static void twaddle(void) { if (DP->select_delay) return; fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR); fd_outb(FDCS->dor, FD_DOR); DRS->select_date = jiffies; } /* reset all driver information about the current fdc. This is needed after * a reset, and after a raw command. */ static void reset_fdc_info(int mode) { int drive; FDCS->spec1 = FDCS->spec2 = -1; FDCS->need_configure = 1; FDCS->perp_mode = 1; FDCS->rawcmd = 0; for (drive = 0; drive < N_DRIVE; drive++) if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL)) UDRS->track = NEED_2_RECAL; } /* selects the fdc and drive, and enables the fdc's input/dma. */ static void set_fdc(int drive) { if (drive >= 0 && drive < N_DRIVE) { fdc = FDC(drive); current_drive = drive; } if (fdc != 1 && fdc != 0) { printk("bad fdc value\n"); return; } set_dor(fdc, ~0, 8); #if N_FDC > 1 set_dor(1 - fdc, ~8, 0); #endif if (FDCS->rawcmd == 2) reset_fdc_info(1); if (fd_inb(FD_STATUS) != STATUS_READY) FDCS->reset = 1; } /* locks the driver */ static int _lock_fdc(int drive, int interruptible, int line) { if (!usage_count) { printk(KERN_ERR "Trying to lock fdc while usage count=0 at line %d\n", line); return -1; } if (floppy_grab_irq_and_dma() == -1) return -EBUSY; if (test_and_set_bit(0, &fdc_busy)) { DECLARE_WAITQUEUE(wait, current); add_wait_queue(&fdc_wait, &wait); for (;;) { set_current_state(TASK_INTERRUPTIBLE); if (!test_and_set_bit(0, &fdc_busy)) break; schedule(); if (!NO_SIGNAL) { remove_wait_queue(&fdc_wait, &wait); return -EINTR; } } set_current_state(TASK_RUNNING); remove_wait_queue(&fdc_wait, &wait); } command_status = FD_COMMAND_NONE; __reschedule_timeout(drive, "lock fdc", 0); set_fdc(drive); return 0; } #define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__) #define LOCK_FDC(drive,interruptible) \ if (lock_fdc(drive,interruptible)) return -EINTR; /* unlocks the driver */ static inline void unlock_fdc(void) { unsigned long flags; raw_cmd = NULL; if (!test_bit(0, &fdc_busy)) DPRINT("FDC access conflict!\n"); if (do_floppy) DPRINT("device interrupt still active at FDC release: %p!\n", do_floppy); command_status = FD_COMMAND_NONE; spin_lock_irqsave(&floppy_lock, flags); del_timer(&fd_timeout); cont = NULL; clear_bit(0, &fdc_busy); if (elv_next_request(floppy_queue)) do_fd_request(floppy_queue); spin_unlock_irqrestore(&floppy_lock, flags); floppy_release_irq_and_dma(); wake_up(&fdc_wait); } /* switches the motor off after a given timeout */ static void motor_off_callback(unsigned long nr) { unsigned char mask = ~(0x10 << UNIT(nr)); set_dor(FDC(nr), mask, 0); } /* schedules motor off */ static void floppy_off(unsigned int drive) { unsigned long volatile delta; register int fdc = FDC(drive); if (!(FDCS->dor & (0x10 << UNIT(drive)))) return; del_timer(motor_off_timer + drive); /* make spindle stop in a position which minimizes spinup time * next time */ if (UDP->rps) { delta = jiffies - UDRS->first_read_date + HZ - UDP->spindown_offset; delta = ((delta * UDP->rps) % HZ) / UDP->rps; motor_off_timer[drive].expires = jiffies + UDP->spindown - delta; } add_timer(motor_off_timer + drive); } /* * cycle through all N_DRIVE floppy drives, for disk change testing. * stopping at current drive. This is done before any long operation, to * be sure to have up to date disk change information. */ static void scandrives(void) { int i, drive, saved_drive; if (DP->select_delay) return; saved_drive = current_drive; for (i = 0; i < N_DRIVE; i++) { drive = (saved_drive + i + 1) % N_DRIVE; if (UDRS->fd_ref == 0 || UDP->select_delay != 0) continue; /* skip closed drives */ set_fdc(drive); if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) & (0x10 << UNIT(drive)))) /* switch the motor off again, if it was off to * begin with */ set_dor(fdc, ~(0x10 << UNIT(drive)), 0); } set_fdc(saved_drive); } static void empty(void) { } static DECLARE_WORK(floppy_work, NULL, NULL); static void schedule_bh(void (*handler) (void)) { PREPARE_WORK(&floppy_work, (void (*)(void *))handler, NULL); schedule_work(&floppy_work); } static DEFINE_TIMER(fd_timer, NULL, 0, 0); static void cancel_activity(void) { unsigned long flags; spin_lock_irqsave(&floppy_lock, flags); do_floppy = NULL; PREPARE_WORK(&floppy_work, (void *)empty, NULL); del_timer(&fd_timer); spin_unlock_irqrestore(&floppy_lock, flags); } /* this function makes sure that the disk stays in the drive during the * transfer */ static void fd_watchdog(void) { #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT("calling disk change from watchdog\n"); } #endif if (disk_change(current_drive)) { DPRINT("disk removed during i/o\n"); cancel_activity(); cont->done(0); reset_fdc(); } else { del_timer(&fd_timer); fd_timer.function = (timeout_fn) fd_watchdog; fd_timer.expires = jiffies + HZ / 10; add_timer(&fd_timer); } } static void main_command_interrupt(void) { del_timer(&fd_timer); cont->interrupt(); } /* waits for a delay (spinup or select) to pass */ static int fd_wait_for_completion(unsigned long delay, timeout_fn function) { if (FDCS->reset) { reset_fdc(); /* do the reset during sleep to win time * if we don't need to sleep, it's a good * occasion anyways */ return 1; } if ((signed)(jiffies - delay) < 0) { del_timer(&fd_timer); fd_timer.function = function; fd_timer.expires = delay; add_timer(&fd_timer); return 1; } return 0; } static DEFINE_SPINLOCK(floppy_hlt_lock); static int hlt_disabled; static void floppy_disable_hlt(void) { unsigned long flags; spin_lock_irqsave(&floppy_hlt_lock, flags); if (!hlt_disabled) { hlt_disabled = 1; #ifdef HAVE_DISABLE_HLT disable_hlt(); #endif } spin_unlock_irqrestore(&floppy_hlt_lock, flags); } static void floppy_enable_hlt(void) { unsigned long flags; spin_lock_irqsave(&floppy_hlt_lock, flags); if (hlt_disabled) { hlt_disabled = 0; #ifdef HAVE_DISABLE_HLT enable_hlt(); #endif } spin_unlock_irqrestore(&floppy_hlt_lock, flags); } static void setup_DMA(void) { unsigned long f; #ifdef FLOPPY_SANITY_CHECK if (raw_cmd->length == 0) { int i; printk("zero dma transfer size:"); for (i = 0; i < raw_cmd->cmd_count; i++) printk("%x,", raw_cmd->cmd[i]); printk("\n"); cont->done(0); FDCS->reset = 1; return; } if (((unsigned long)raw_cmd->kernel_data) % 512) { printk("non aligned address: %p\n", raw_cmd->kernel_data); cont->done(0); FDCS->reset = 1; return; } #endif f = claim_dma_lock(); fd_disable_dma(); #ifdef fd_dma_setup if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, (raw_cmd->flags & FD_RAW_READ) ? DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) { release_dma_lock(f); cont->done(0); FDCS->reset = 1; return; } release_dma_lock(f); #else fd_clear_dma_ff(); fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? DMA_MODE_READ : DMA_MODE_WRITE); fd_set_dma_addr(raw_cmd->kernel_data); fd_set_dma_count(raw_cmd->length); virtual_dma_port = FDCS->address; fd_enable_dma(); release_dma_lock(f); #endif floppy_disable_hlt(); } static void show_floppy(void); /* waits until the fdc becomes ready */ static int wait_til_ready(void) { int counter, status; if (FDCS->reset) return -1; for (counter = 0; counter < 10000; counter++) { status = fd_inb(FD_STATUS); if (status & STATUS_READY) return status; } if (!initialising) { DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); show_floppy(); } FDCS->reset = 1; return -1; } /* sends a command byte to the fdc */ static int output_byte(char byte) { int status; if ((status = wait_til_ready()) < 0) return -1; if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) { fd_outb(byte, FD_DATA); #ifdef FLOPPY_SANITY_CHECK output_log[output_log_pos].data = byte; output_log[output_log_pos].status = status; output_log[output_log_pos].jiffies = jiffies; output_log_pos = (output_log_pos + 1) % OLOGSIZE; #endif return 0; } FDCS->reset = 1; if (!initialising) { DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", byte, fdc, status); show_floppy(); } return -1; } #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;} /* gets the response from the fdc */ static int result(void) { int i, status = 0; for (i = 0; i < MAX_REPLIES; i++) { if ((status = wait_til_ready()) < 0) break; status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; if ((status & ~STATUS_BUSY) == STATUS_READY) { #ifdef FLOPPY_SANITY_CHECK resultjiffies = jiffies; resultsize = i; #endif return i; } if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) reply_buffer[i] = fd_inb(FD_DATA); else break; } if (!initialising) { DPRINT ("get result error. Fdc=%d Last status=%x Read bytes=%d\n", fdc, status, i); show_floppy(); } FDCS->reset = 1; return -1; } #define MORE_OUTPUT -2 /* does the fdc need more output? */ static int need_more_output(void) { int status; if ((status = wait_til_ready()) < 0) return -1; if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) return MORE_OUTPUT; return result(); } /* Set perpendicular mode as required, based on data rate, if supported. * 82077 Now tested. 1Mbps data rate only possible with 82077-1. */ static inline void perpendicular_mode(void) { unsigned char perp_mode; if (raw_cmd->rate & 0x40) { switch (raw_cmd->rate & 3) { case 0: perp_mode = 2; break; case 3: perp_mode = 3; break; default: DPRINT("Invalid data rate for perpendicular mode!\n"); cont->done(0); FDCS->reset = 1; /* convenient way to return to * redo without to much hassle (deep * stack et al. */ return; } } else perp_mode = 0; if (FDCS->perp_mode == perp_mode) return; if (FDCS->version >= FDC_82077_ORIG) { output_byte(FD_PERPENDICULAR); output_byte(perp_mode); FDCS->perp_mode = perp_mode; } else if (perp_mode) { DPRINT("perpendicular mode not supported by this FDC.\n"); } } /* perpendicular_mode */ static int fifo_depth = 0xa; static int no_fifo; static int fdc_configure(void) { /* Turn on FIFO */ output_byte(FD_CONFIGURE); if (need_more_output() != MORE_OUTPUT) return 0; output_byte(0); output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); output_byte(0); /* pre-compensation from track 0 upwards */ return 1; } #define NOMINAL_DTR 500 /* Issue a "SPECIFY" command to set the step rate time, head unload time, * head load time, and DMA disable flag to values needed by floppy. * * The value "dtr" is the data transfer rate in Kbps. It is needed * to account for the data rate-based scaling done by the 82072 and 82077 * FDC types. This parameter is ignored for other types of FDCs (i.e. * 8272a). * * Note that changing the data transfer rate has a (probably deleterious) * effect on the parameters subject to scaling for 82072/82077 FDCs, so * fdc_specify is called again after each data transfer rate * change. * * srt: 1000 to 16000 in microseconds * hut: 16 to 240 milliseconds * hlt: 2 to 254 milliseconds * * These values are rounded up to the next highest available delay time. */ static void fdc_specify(void) { unsigned char spec1, spec2; unsigned long srt, hlt, hut; unsigned long dtr = NOMINAL_DTR; unsigned long scale_dtr = NOMINAL_DTR; int hlt_max_code = 0x7f; int hut_max_code = 0xf; if (FDCS->need_configure && FDCS->version >= FDC_82072A) { fdc_configure(); FDCS->need_configure = 0; /*DPRINT("FIFO enabled\n"); */ } switch (raw_cmd->rate & 0x03) { case 3: dtr = 1000; break; case 1: dtr = 300; if (FDCS->version >= FDC_82078) { /* chose the default rate table, not the one * where 1 = 2 Mbps */ output_byte(FD_DRIVESPEC); if (need_more_output() == MORE_OUTPUT) { output_byte(UNIT(current_drive)); output_byte(0xc0); } } break; case 2: dtr = 250; break; } if (FDCS->version >= FDC_82072) { scale_dtr = dtr; hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ } /* Convert step rate from microseconds to milliseconds and 4 bits */ srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR; if (slow_floppy) { srt = srt / 4; } SUPBOUND(srt, 0xf); INFBOUND(srt, 0); hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR; if (hlt < 0x01) hlt = 0x01; else if (hlt > 0x7f) hlt = hlt_max_code; hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR; if (hut < 0x1) hut = 0x1; else if (hut > 0xf) hut = hut_max_code; spec1 = (srt << 4) | hut; spec2 = (hlt << 1) | (use_virtual_dma & 1); /* If these parameters did not change, just return with success */ if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) { /* Go ahead and set spec1 and spec2 */ output_byte(FD_SPECIFY); output_byte(FDCS->spec1 = spec1); output_byte(FDCS->spec2 = spec2); } } /* fdc_specify */ /* Set the FDC's data transfer rate on behalf of the specified drive. * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue * of the specify command (i.e. using the fdc_specify function). */ static int fdc_dtr(void) { /* If data rate not already set to desired value, set it. */ if ((raw_cmd->rate & 3) == FDCS->dtr) return 0; /* Set dtr */ fd_outb(raw_cmd->rate & 3, FD_DCR); /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) * need a stabilization period of several milliseconds to be * enforced after data rate changes before R/W operations. * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) */ FDCS->dtr = raw_cmd->rate & 3; return (fd_wait_for_completion(jiffies + 2UL * HZ / 100, (timeout_fn) floppy_ready)); } /* fdc_dtr */ static void tell_sector(void) { printk(": track %d, head %d, sector %d, size %d", R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE); } /* tell_sector */ /* * OK, this error interpreting routine is called after a * DMA read/write has succeeded * or failed, so we check the results, and copy any buffers. * hhb: Added better error reporting. * ak: Made this into a separate routine. */ static int interpret_errors(void) { char bad; if (inr != 7) { DPRINT("-- FDC reply error"); FDCS->reset = 1; return 1; } /* check IC to find cause of interrupt */ switch (ST0 & ST0_INTR) { case 0x40: /* error occurred during command execution */ if (ST1 & ST1_EOC) return 0; /* occurs with pseudo-DMA */ bad = 1; if (ST1 & ST1_WP) { DPRINT("Drive is write protected\n"); CLEARF(FD_DISK_WRITABLE); cont->done(0); bad = 2; } else if (ST1 & ST1_ND) { SETF(FD_NEED_TWADDLE); } else if (ST1 & ST1_OR) { if (DP->flags & FTD_MSG) DPRINT("Over/Underrun - retrying\n"); bad = 0; } else if (*errors >= DP->max_errors.reporting) { DPRINT(""); if (ST0 & ST0_ECE) { printk("Recalibrate failed!"); } else if (ST2 & ST2_CRC) { printk("data CRC error"); tell_sector(); } else if (ST1 & ST1_CRC) { printk("CRC error"); tell_sector(); } else if ((ST1 & (ST1_MAM | ST1_ND)) || (ST2 & ST2_MAM)) { if (!probing) { printk("sector not found"); tell_sector(); } else printk("probe failed..."); } else if (ST2 & ST2_WC) { /* seek error */ printk("wrong cylinder"); } else if (ST2 & ST2_BC) { /* cylinder marked as bad */ printk("bad cylinder"); } else { printk ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2); tell_sector(); } printk("\n"); } if (ST2 & ST2_WC || ST2 & ST2_BC) /* wrong cylinder => recal */ DRS->track = NEED_2_RECAL; return bad; case 0x80: /* invalid command given */ DPRINT("Invalid FDC command given!\n"); cont->done(0); return 2; case 0xc0: DPRINT("Abnormal termination caused by polling\n"); cont->error(); return 2; default: /* (0) Normal command termination */ return 0; } } /* * This routine is called when everything should be correctly set up * for the transfer (i.e. floppy motor is on, the correct floppy is * selected, and the head is sitting on the right track). */ static void setup_rw_floppy(void) { int i, r, flags, dflags; unsigned long ready_date; timeout_fn function; flags = raw_cmd->flags; if (flags & (FD_RAW_READ | FD_RAW_WRITE)) flags |= FD_RAW_INTR; if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { ready_date = DRS->spinup_date + DP->spinup; /* If spinup will take a long time, rerun scandrives * again just before spinup completion. Beware that * after scandrives, we must again wait for selection. */ if ((signed)(ready_date - jiffies) > DP->select_delay) { ready_date -= DP->select_delay; function = (timeout_fn) floppy_start; } else function = (timeout_fn) setup_rw_floppy; /* wait until the floppy is spinning fast enough */ if (fd_wait_for_completion(ready_date, function)) return; } dflags = DRS->flags; if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) setup_DMA(); if (flags & FD_RAW_INTR) do_floppy = main_command_interrupt; r = 0; for (i = 0; i < raw_cmd->cmd_count; i++) r |= output_byte(raw_cmd->cmd[i]); debugt("rw_command: "); if (r) { cont->error(); reset_fdc(); return; } if (!(flags & FD_RAW_INTR)) { inr = result(); cont->interrupt(); } else if (flags & FD_RAW_NEED_DISK) fd_watchdog(); } static int blind_seek; /* * This is the routine called after every seek (or recalibrate) interrupt * from the floppy controller. */ static void seek_interrupt(void) { debugt("seek interrupt:"); if (inr != 2 || (ST0 & 0xF8) != 0x20) { DPRINT("seek failed\n"); DRS->track = NEED_2_RECAL; cont->error(); cont->redo(); return; } if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) { #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT ("clearing NEWCHANGE flag because of effective seek\n"); DPRINT("jiffies=%lu\n", jiffies); } #endif CLEARF(FD_DISK_NEWCHANGE); /* effective seek */ DRS->select_date = jiffies; } DRS->track = ST1; floppy_ready(); } static void check_wp(void) { if (TESTF(FD_VERIFY)) { /* check write protection */ output_byte(FD_GETSTATUS); output_byte(UNIT(current_drive)); if (result() != 1) { FDCS->reset = 1; return; } CLEARF(FD_VERIFY); CLEARF(FD_NEED_TWADDLE); #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT("checking whether disk is write protected\n"); DPRINT("wp=%x\n", ST3 & 0x40); } #endif if (!(ST3 & 0x40)) SETF(FD_DISK_WRITABLE); else CLEARF(FD_DISK_WRITABLE); } } static void seek_floppy(void) { int track; blind_seek = 0; #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT("calling disk change from seek\n"); } #endif if (!TESTF(FD_DISK_NEWCHANGE) && disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { /* the media changed flag should be cleared after the seek. * If it isn't, this means that there is really no disk in * the drive. */ SETF(FD_DISK_CHANGED); cont->done(0); cont->redo(); return; } if (DRS->track <= NEED_1_RECAL) { recalibrate_floppy(); return; } else if (TESTF(FD_DISK_NEWCHANGE) && (raw_cmd->flags & FD_RAW_NEED_DISK) && (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) { /* we seek to clear the media-changed condition. Does anybody * know a more elegant way, which works on all drives? */ if (raw_cmd->track) track = raw_cmd->track - 1; else { if (DP->flags & FD_SILENT_DCL_CLEAR) { set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0); blind_seek = 1; raw_cmd->flags |= FD_RAW_NEED_SEEK; } track = 1; } } else { check_wp(); if (raw_cmd->track != DRS->track && (raw_cmd->flags & FD_RAW_NEED_SEEK)) track = raw_cmd->track; else { setup_rw_floppy(); return; } } do_floppy = seek_interrupt; output_byte(FD_SEEK); output_byte(UNIT(current_drive)); LAST_OUT(track); debugt("seek command:"); } static void recal_interrupt(void) { debugt("recal interrupt:"); if (inr != 2) FDCS->reset = 1; else if (ST0 & ST0_ECE) { switch (DRS->track) { case NEED_1_RECAL: debugt("recal interrupt need 1 recal:"); /* after a second recalibrate, we still haven't * reached track 0. Probably no drive. Raise an * error, as failing immediately might upset * computers possessed by the Devil :-) */ cont->error(); cont->redo(); return; case NEED_2_RECAL: debugt("recal interrupt need 2 recal:"); /* If we already did a recalibrate, * and we are not at track 0, this * means we have moved. (The only way * not to move at recalibration is to * be already at track 0.) Clear the * new change flag */ #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT ("clearing NEWCHANGE flag because of second recalibrate\n"); } #endif CLEARF(FD_DISK_NEWCHANGE); DRS->select_date = jiffies; /* fall through */ default: debugt("recal interrupt default:"); /* Recalibrate moves the head by at * most 80 steps. If after one * recalibrate we don't have reached * track 0, this might mean that we * started beyond track 80. Try * again. */ DRS->track = NEED_1_RECAL; break; } } else DRS->track = ST1; floppy_ready(); } static void print_result(char *message, int inr) { int i; DPRINT("%s ", message); if (inr >= 0) for (i = 0; i < inr; i++) printk("repl[%d]=%x ", i, reply_buffer[i]); printk("\n"); } /* interrupt handler. Note that this can be called externally on the Sparc */ irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs) { void (*handler) (void) = do_floppy; int do_print; unsigned long f; lasthandler = handler; interruptjiffies = jiffies; f = claim_dma_lock(); fd_disable_dma(); release_dma_lock(f); floppy_enable_hlt(); do_floppy = NULL; if (fdc >= N_FDC || FDCS->address == -1) { /* we don't even know which FDC is the culprit */ printk("DOR0=%x\n", fdc_state[0].dor); printk("floppy interrupt on bizarre fdc %d\n", fdc); printk("handler=%p\n", handler); is_alive("bizarre fdc"); return IRQ_NONE; } FDCS->reset = 0; /* We have to clear the reset flag here, because apparently on boxes * with level triggered interrupts (PS/2, Sparc, ...), it is needed to * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the * emission of the SENSEI's. * It is OK to emit floppy commands because we are in an interrupt * handler here, and thus we have to fear no interference of other * activity. */ do_print = !handler && print_unex && !initialising; inr = result(); if (do_print) print_result("unexpected interrupt", inr); if (inr == 0) { int max_sensei = 4; do { output_byte(FD_SENSEI); inr = result(); if (do_print) print_result("sensei", inr); max_sensei--; } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2 && max_sensei); } if (!handler) { FDCS->reset = 1; return IRQ_NONE; } schedule_bh(handler); is_alive("normal interrupt end"); /* FIXME! Was it really for us? */ return IRQ_HANDLED; } static void recalibrate_floppy(void) { debugt("recalibrate floppy:"); do_floppy = recal_interrupt; output_byte(FD_RECALIBRATE); LAST_OUT(UNIT(current_drive)); } /* * Must do 4 FD_SENSEIs after reset because of ``drive polling''. */ static void reset_interrupt(void) { debugt("reset interrupt:"); result(); /* get the status ready for set_fdc */ if (FDCS->reset) { printk("reset set in interrupt, calling %p\n", cont->error); cont->error(); /* a reset just after a reset. BAD! */ } cont->redo(); } /* * reset is done by pulling bit 2 of DOR low for a while (old FDCs), * or by setting the self clearing bit 7 of STATUS (newer FDCs) */ static void reset_fdc(void) { unsigned long flags; do_floppy = reset_interrupt; FDCS->reset = 0; reset_fdc_info(0); /* Pseudo-DMA may intercept 'reset finished' interrupt. */ /* Irrelevant for systems with true DMA (i386). */ flags = claim_dma_lock(); fd_disable_dma(); release_dma_lock(flags); if (FDCS->version >= FDC_82072A) fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS); else { fd_outb(FDCS->dor & ~0x04, FD_DOR); udelay(FD_RESET_DELAY); fd_outb(FDCS->dor, FD_DOR); } } static void show_floppy(void) { int i; printk("\n"); printk("floppy driver state\n"); printk("-------------------\n"); printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n", jiffies, interruptjiffies, jiffies - interruptjiffies, lasthandler); #ifdef FLOPPY_SANITY_CHECK printk("timeout_message=%s\n", timeout_message); printk("last output bytes:\n"); for (i = 0; i < OLOGSIZE; i++) printk("%2x %2x %lu\n", output_log[(i + output_log_pos) % OLOGSIZE].data, output_log[(i + output_log_pos) % OLOGSIZE].status, output_log[(i + output_log_pos) % OLOGSIZE].jiffies); printk("last result at %lu\n", resultjiffies); printk("last redo_fd_request at %lu\n", lastredo); for (i = 0; i < resultsize; i++) { printk("%2x ", reply_buffer[i]); } printk("\n"); #endif printk("status=%x\n", fd_inb(FD_STATUS)); printk("fdc_busy=%lu\n", fdc_busy); if (do_floppy) printk("do_floppy=%p\n", do_floppy); if (floppy_work.pending) printk("floppy_work.func=%p\n", floppy_work.func); if (timer_pending(&fd_timer)) printk("fd_timer.function=%p\n", fd_timer.function); if (timer_pending(&fd_timeout)) { printk("timer_function=%p\n", fd_timeout.function); printk("expires=%lu\n", fd_timeout.expires - jiffies); printk("now=%lu\n", jiffies); } printk("cont=%p\n", cont); printk("current_req=%p\n", current_req); printk("command_status=%d\n", command_status); printk("\n"); } static void floppy_shutdown(unsigned long data) { unsigned long flags; if (!initialising) show_floppy(); cancel_activity(); floppy_enable_hlt(); flags = claim_dma_lock(); fd_disable_dma(); release_dma_lock(flags); /* avoid dma going to a random drive after shutdown */ if (!initialising) DPRINT("floppy timeout called\n"); FDCS->reset = 1; if (cont) { cont->done(0); cont->redo(); /* this will recall reset when needed */ } else { printk("no cont in shutdown!\n"); process_fd_request(); } is_alive("floppy shutdown"); } /*typedef void (*timeout_fn)(unsigned long);*/ /* start motor, check media-changed condition and write protection */ static int start_motor(void (*function) (void)) { int mask, data; mask = 0xfc; data = UNIT(current_drive); if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) { set_debugt(); /* no read since this drive is running */ DRS->first_read_date = 0; /* note motor start time if motor is not yet running */ DRS->spinup_date = jiffies; data |= (0x10 << UNIT(current_drive)); } } else if (FDCS->dor & (0x10 << UNIT(current_drive))) mask &= ~(0x10 << UNIT(current_drive)); /* starts motor and selects floppy */ del_timer(motor_off_timer + current_drive); set_dor(fdc, mask, data); /* wait_for_completion also schedules reset if needed. */ return (fd_wait_for_completion(DRS->select_date + DP->select_delay, (timeout_fn) function)); } static void floppy_ready(void) { CHECK_RESET; if (start_motor(floppy_ready)) return; if (fdc_dtr()) return; #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT("calling disk change from floppy_ready\n"); } #endif if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && disk_change(current_drive) && !DP->select_delay) twaddle(); /* this clears the dcl on certain drive/controller * combinations */ #ifdef fd_chose_dma_mode if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { unsigned long flags = claim_dma_lock(); fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); release_dma_lock(flags); } #endif if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { perpendicular_mode(); fdc_specify(); /* must be done here because of hut, hlt ... */ seek_floppy(); } else { if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) fdc_specify(); setup_rw_floppy(); } } static void floppy_start(void) { reschedule_timeout(current_reqD, "floppy start", 0); scandrives(); #ifdef DCL_DEBUG if (DP->flags & FD_DEBUG) { DPRINT("setting NEWCHANGE in floppy_start\n"); } #endif SETF(FD_DISK_NEWCHANGE); floppy_ready(); } /* * ======================================================================== * here ends the bottom half. Exported routines are: * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, * start_motor, reset_fdc, reset_fdc_info, interpret_errors. * Initialization also uses output_byte, result, set_dor, floppy_interrupt * and set_dor. * ======================================================================== */ /* * General purpose continuations. * ============================== */ static void do_wakeup(void) { reschedule_timeout(MAXTIMEOUT, "do wakeup", 0); cont = NULL; command_status += 2; wake_up(&command_done); } static struct cont_t wakeup_cont = { .interrupt = empty, .redo = do_wakeup, .error = empty, .done = (done_f) empty }; static struct cont_t intr_cont = { .interrupt = empty, .redo = process_fd_request, .error = empty, .done = (done_f) empty }; static int wait_til_done(void (*handler) (void), int interruptible) { int ret; schedule_bh(handler); if (command_status < 2 && NO_SIGNAL) { DECLARE_WAITQUEUE(wait, current); add_wait_queue(&command_done, &wait); for (;;) { set_current_state(interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE); if (command_status >= 2 || !NO_SIGNAL) break; is_alive("wait_til_done"); schedule(); } set_current_state(TASK_RUNNING); remove_wait_queue(&command_done, &wait); } if (command_status < 2) { cancel_activity(); cont = &intr_cont; reset_fdc(); return -EINTR; } if (FDCS->reset) command_status = FD_COMMAND_ERROR; if (command_status == FD_COMMAND_OKAY) ret = 0; else ret = -EIO; command_status = FD_COMMAND_NONE; return ret; } static void generic_done(int result) { command_status = result; cont = &wakeup_cont; } static void generic_success(void) { cont->done(1); } static void generic_failure(void) { cont->done(0); } static void success_and_wakeup(void) { generic_success(); cont->redo(); } /* * formatting and rw support. * ========================== */ static int next_valid_format(void) { int probed_format; probed_format = DRS->probed_format; while (1) { if (probed_format >= 8 || !DP->autodetect[probed_format]) { DRS->probed_format = 0; return 1; } if (floppy_type[DP->autodetect[probed_format]].sect) { DRS->probed_format = probed_format; return 0; } probed_format++; } } static void bad_flp_intr(void) { int err_count; if (probing) { DRS->probed_format++; if (!next_valid_format()) return; } err_count = ++(*errors); INFBOUND(DRWE->badness, err_count); if (err_count > DP->max_errors.abort) cont->done(0); if (err_count > DP->max_errors.reset) FDCS->reset = 1; else if (err_count > DP->max_errors.recal) DRS->track = NEED_2_RECAL; } static void set_floppy(int drive) { int type = ITYPE(UDRS->fd_device); if (type) _floppy = floppy_type + type; else _floppy = current_type[drive]; } /* * formatting support. * =================== */ static void format_interrupt(void) { switch (interpret_errors()) { case 1: cont->error(); case 2: break; case 0: cont->done(1); } cont->redo(); } #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2) #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1)) #define CT(x) ((x) | 0xc0) static void setup_format_params(int track) { struct fparm { unsigned char track, head, sect, size; } *here = (struct fparm *)floppy_track_buffer; int il, n; int count, head_shift, track_shift; raw_cmd = &default_raw_cmd; raw_cmd->track = track; raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK; raw_cmd->rate = _floppy->rate & 0x43; raw_cmd->cmd_count = NR_F; COMMAND = FM_MODE(_floppy, FD_FORMAT); DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); F_SIZECODE = FD_SIZECODE(_floppy); F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE; F_GAP = _floppy->fmt_gap; F_FILL = FD_FILL_BYTE; raw_cmd->kernel_data = floppy_track_buffer; raw_cmd->length = 4 * F_SECT_PER_TRACK; /* allow for about 30ms for data transport per track */ head_shift = (F_SECT_PER_TRACK + 5) / 6; /* a ``cylinder'' is two tracks plus a little stepping time */ track_shift = 2 * head_shift + 3; /* position of logical sector 1 on this track */ n = (track_shift * format_req.track + head_shift * format_req.head) % F_SECT_PER_TRACK; /* determine interleave */ il = 1; if (_floppy->fmt_gap < 0x22) il++; /* initialize field */ for (count = 0; count < F_SECT_PER_TRACK; ++count) { here[count].track = format_req.track; here[count].head = format_req.head; here[count].sect = 0; here[count].size = F_SIZECODE; } /* place logical sectors */ for (count = 1; count <= F_SECT_PER_TRACK; ++count) { here[n].sect = count; n = (n + il) % F_SECT_PER_TRACK; if (here[n].sect) { /* sector busy, find next free sector */ ++n; if (n >= F_SECT_PER_TRACK) { n -= F_SECT_PER_TRACK; while (here[n].sect) ++n; } } } if (_floppy->stretch & FD_ZEROBASED) { for (count = 0; count < F_SECT_PER_TRACK; count++) here[count].sect--; } } static void redo_format(void) { buffer_track = -1; setup_format_params(format_req.track << STRETCH(_floppy)); floppy_start(); debugt("queue format request"); } static struct cont_t format_cont = { .interrupt = format_interrupt, .redo = redo_format, .error = bad_flp_intr, .done = generic_done }; static int do_format(int drive, struct format_descr *tmp_format_req) { int ret; LOCK_FDC(drive, 1); set_floppy(drive); if (!_floppy || _floppy->track > DP->tracks || tmp_format_req->track >= _floppy->track || tmp_format_req->head >= _floppy->head || (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || !_floppy->fmt_gap) { process_fd_request(); return -EINVAL; } format_req = *tmp_format_req; format_errors = 0; cont = &format_cont; errors = &format_errors; IWAIT(redo_format); process_fd_request(); return ret; } /* * Buffer read/write and support * ============================= */ static void floppy_end_request(struct request *req, int uptodate) { unsigned int nr_sectors = current_count_sectors; /* current_count_sectors can be zero if transfer failed */ if (!uptodate) nr_sectors = req->current_nr_sectors; if (end_that_request_first(req, uptodate, nr_sectors)) return; add_disk_randomness(req->rq_disk); floppy_off((long)req->rq_disk->private_data); blkdev_dequeue_request(req); end_that_request_last(req); /* We're done with the request */ current_req = NULL; } /* new request_done. Can handle physical sectors which are smaller than a * logical buffer */ static void request_done(int uptodate) { struct request_queue *q = floppy_queue; struct request *req = current_req; unsigned long flags; int block; probing = 0; reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate); if (!req) { printk("floppy.c: no request in request_done\n"); return; } if (uptodate) { /* maintain values for invalidation on geometry * change */ block = current_count_sectors + req->sector; INFBOUND(DRS->maxblock, block); if (block > _floppy->sect) DRS->maxtrack = 1; /* unlock chained buffers */ spin_lock_irqsave(q->queue_lock, flags); floppy_end_request(req, 1); spin_unlock_irqrestore(q->queue_lock, flags); } else { if (rq_data_dir(req) == WRITE) { /* record write error information */ DRWE->write_errors++; if (DRWE->write_errors == 1) { DRWE->first_error_sector = req->sector; DRWE->first_error_generation = DRS->generation; } DRWE->last_error_sector = req->sector; DRWE->last_error_generation = DRS->generation; } spin_lock_irqsave(q->queue_lock, flags); floppy_end_request(req, 0); spin_unlock_irqrestore(q->queue_lock, flags); } } /* Interrupt handler evaluating the result of the r/w operation */ static void rw_interrupt(void) { int nr_sectors, ssize, eoc, heads; if (R_HEAD >= 2) { /* some Toshiba floppy controllers occasionnally seem to * return bogus interrupts after read/write operations, which * can be recognized by a bad head number (>= 2) */ return; } if (!DRS->first_read_date) DRS->first_read_date = jiffies; nr_sectors = 0; CODE2SIZE; if (ST1 & ST1_EOC) eoc = 1; else eoc = 0; if (COMMAND & 0x80) heads = 2; else heads = 1; nr_sectors = (((R_TRACK - TRACK) * heads + R_HEAD - HEAD) * SECT_PER_TRACK + R_SECTOR - SECTOR + eoc) << SIZECODE >> 2; #ifdef FLOPPY_SANITY_CHECK if (nr_sectors / ssize > (in_sector_offset + current_count_sectors + ssize - 1) / ssize) { DPRINT("long rw: %x instead of %lx\n", nr_sectors, current_count_sectors); printk("rs=%d s=%d\n", R_SECTOR, SECTOR); printk("rh=%d h=%d\n", R_HEAD, HEAD); printk("rt=%d t=%d\n", R_TRACK, TRACK); printk("heads=%d eoc=%d\n", heads, eoc); printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK, fsector_t, ssize); printk("in_sector_offset=%d\n", in_sector_offset); } #endif nr_sectors -= in_sector_offset; INFBOUND(nr_sectors, 0); SUPBOUND(current_count_sectors, nr_sectors); switch (interpret_errors()) { case 2: cont->redo(); return; case 1: if (!current_count_sectors) { cont->error(); cont->redo(); return; } break; case 0: if (!current_count_sectors) { cont->redo(); return; } current_type[current_drive] = _floppy; floppy_sizes[TOMINOR(current_drive)] = _floppy->size; break; } if (probing) { if (DP->flags & FTD_MSG) DPRINT("Auto-detected floppy type %s in fd%d\n", _floppy->name, current_drive); current_type[current_drive] = _floppy; floppy_sizes[TOMINOR(current_drive)] = _floppy->size; probing = 0; } if (CT(COMMAND) != FD_READ || raw_cmd->kernel_data == current_req->buffer) { /* transfer directly from buffer */ cont->done(1); } else if (CT(COMMAND) == FD_READ) { buffer_track = raw_cmd->track; buffer_drive = current_drive; INFBOUND(buffer_max, nr_sectors + fsector_t); } cont->redo(); } /* Compute maximal contiguous buffer size. */ static int buffer_chain_size(void) { struct bio *bio; struct bio_vec *bv; int size, i; char *base; base = bio_data(current_req->bio); size = 0; rq_for_each_bio(bio, current_req) { bio_for_each_segment(bv, bio, i) { if (page_address(bv->bv_page) + bv->bv_offset != base + size) break; size += bv->bv_len; } } return size >> 9; } /* Compute the maximal transfer size */ static int transfer_size(int ssize, int max_sector, int max_size) { SUPBOUND(max_sector, fsector_t + max_size); /* alignment */ max_sector -= (max_sector % _floppy->sect) % ssize; /* transfer size, beginning not aligned */ current_count_sectors = max_sector - fsector_t; return max_sector; } /* * Move data from/to the track buffer to/from the buffer cache. */ static void copy_buffer(int ssize, int max_sector, int max_sector_2) { int remaining; /* number of transferred 512-byte sectors */ struct bio_vec *bv; struct bio *bio; char *buffer, *dma_buffer; int size, i; max_sector = transfer_size(ssize, min(max_sector, max_sector_2), current_req->nr_sectors); if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE && buffer_max > fsector_t + current_req->nr_ else #endif *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { /* * orig_gpr2 is stored on the kernel stack */ task_pt_regs(child)->orig_gpr2 = data; } else if (addr < (addr_t) &dummy->regs.fp_regs) { /* * prevent writes of padding hole between * orig_gpr2 and fp_regs on s390. */ return 0; } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { /* * floating point regs. are stored in the thread structure */ if (addr == (addr_t) &dummy->regs.fp_regs.fpc && (data & ~((unsigned long) FPC_VALID_MASK << (BITS_PER_LONG - 32))) != 0) return -EINVAL; offset = addr - (addr_t) &dummy->regs.fp_regs; *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { /* * per_info is found in the thread structure */ offset = addr - (addr_t) &dummy->regs.per_info; *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; } FixPerRegisters(child); return 0; } static int poke_user(struct task_struct *child, addr_t addr, addr_t data) { addr_t mask; /* * Stupid gdb peeks/pokes the access registers in 64 bit with * an alignment of 4. Programmers from hell indeed... */ mask = __ADDR_MASK; #ifdef CONFIG_64BIT if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) mask = 3; #endif if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) return -EIO; return __poke_user(child, addr, data); } long arch_ptrace(struct task_struct *child, long request, long addr, long data) { ptrace_area parea; int copied, ret; switch (request) { case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: /* Remove high order bit from address (only for 31 bit). */ addr &= PSW_ADDR_INSN; /* read word at location addr. */ return generic_ptrace_peekdata(child, addr, data); case PTRACE_PEEKUSR: /* read the word at location addr in the USER area. */ return peek_user(child, addr, data); case PTRACE_POKETEXT: case PTRACE_POKEDATA: /* Remove high order bit from address (only for 31 bit). */ addr &= PSW_ADDR_INSN; /* write the word at location addr. */ return generic_ptrace_pokedata(child, addr, data); case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ return poke_user(child, addr, data); case PTRACE_PEEKUSR_AREA: case PTRACE_POKEUSR_AREA: if (copy_from_user(&parea, (void __force __user *) addr, sizeof(parea))) return -EFAULT; addr = parea.kernel_addr; data = parea.process_addr; copied = 0; while (copied < parea.len) { if (request == PTRACE_PEEKUSR_AREA) ret = peek_user(child, addr, data); else { addr_t utmp; if (get_user(utmp, (addr_t __force __user *) data)) return -EFAULT; ret = poke_user(child, addr, utmp); } if (ret) return ret; addr += sizeof(unsigned long); data += sizeof(unsigned long); copied += sizeof(unsigned long); } return 0; } return ptrace_request(child, request, addr, data); } #ifdef CONFIG_COMPAT /* * Now the fun part starts... a 31 bit program running in the * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy * to handle, the difference to the 64 bit versions of the requests * is that the access is done in multiples of 4 byte instead of * 8 bytes (sizeof(unsigned long) on 31/64 bit). * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program * is a 31 bit program too, the content of struct user can be * emulated. A 31 bit program peeking into the struct user of * a 64 bit program is a no-no. */ /* * Same as peek_user but for a 31 bit program. */ static u32 __peek_user_compat(struct task_struct *child, addr_t addr) { struct user32 *dummy32 = NULL; per_struct32 *dummy_per32 = NULL; addr_t offset; __u32 tmp; if (addr < (addr_t) &dummy32->regs.acrs) { /* * psw and gprs are stored on the stack */ if (addr == (addr_t) &dummy32->regs.psw.mask) { /* Fake a 31 bit psw mask. */ tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); } else if (addr == (addr_t) &dummy32->regs.psw.addr) { /* Fake a 31 bit psw address. */ tmp = (__u32) task_pt_regs(child)->psw.addr | PSW32_ADDR_AMODE31; } else { /* gpr 0-15 */ tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + addr*2 + 4); } } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { /* * access registers are stored in the thread structure */ offset = addr - (addr_t) &dummy32->regs.acrs; tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { /* * orig_gpr2 is stored on the kernel stack */ tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); } else if (addr < (addr_t) &dummy32->regs.fp_regs) { /* * prevent reads of padding hole between * orig_gpr2 and fp_regs on s390. */ tmp = 0; } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { /* * floating point regs. are stored in the thread structure */ offset = addr - (addr_t) &dummy32->regs.fp_regs; tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { /* * per_info is found in the thread structure */ offset = addr - (addr_t) &dummy32->regs.per_info; /* This is magic. See per_struct and per_struct32. */ if ((offset >= (addr_t) &dummy_per32->control_regs && offset < (addr_t) (&dummy_per32->control_regs + 1)) || (offset >= (addr_t) &dummy_per32->starting_addr && offset <= (addr_t) &dummy_per32->ending_addr) || offset == (addr_t) &dummy_per32->lowcore.words.address) offset = offset*2 + 4; else offset = offset*2; tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); } else tmp = 0; return tmp; } static int peek_user_compat(struct task_struct *child, addr_t addr, addr_t data) { __u32 tmp; if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) return -EIO; tmp = __peek_user_compat(child, addr); return put_user(tmp, (__u32 __user *) data); } /* * Same as poke_user but for a 31 bit program. */ static int __poke_user_compat(struct task_struct *child, addr_t addr, addr_t data) { struct user32 *dummy32 = NULL; per_struct32 *dummy_per32 = NULL; __u32 tmp = (__u32) data; addr_t offset; if (addr < (addr_t) &dummy32->regs.acrs) { /* * psw, gprs, acrs and orig_gpr2 are stored on the stack */ if (addr == (addr_t) &dummy32->regs.psw.mask) { /* Build a 64 bit psw mask from 31 bit mask. */ if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) /* Invalid psw mask. */ return -EINVAL; task_pt_regs(child)->psw.mask = PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); } else if (addr == (addr_t) &dummy32->regs.psw.addr) { /* Build a 64 bit psw address from 31 bit address. */ task_pt_regs(child)->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; } else { /* gpr 0-15 */ *(__u32*)((addr_t) &task_pt_regs(child)->psw + addr*2 + 4) = tmp; } } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { /* * access registers are stored in the thread structure */ offset = addr - (addr_t) &dummy32->regs.acrs; *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { /* * orig_gpr2 is stored on the kernel stack */ *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; } else if (addr < (addr_t) &dummy32->regs.fp_regs) { /* * prevent writess of padding hole between * orig_gpr2 and fp_regs on s390. */ return 0; } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { /* * floating point regs. are stored in the thread structure */ if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && (tmp & ~FPC_VALID_MASK) != 0) /* Invalid floating point control. */ return -EINVAL; offset = addr - (addr_t) &dummy32->regs.fp_regs; *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { /* * per_info is found in the thread structure. */ offset = addr - (addr_t) &dummy32->regs.per_info; /* * This is magic. See per_struct and per_struct32. * By incident the offsets in per_struct are exactly * twice the offsets in per_struct32 for all fields. * The 8 byte fields need special handling though, * because the second half (bytes 4-7) is needed and * not the first half. */ if ((offset >= (addr_t) &dummy_per32->control_regs && offset < (addr_t) (&dummy_per32->control_regs + 1)) || (offset >= (addr_t) &dummy_per32->starting_addr && offset <= (addr_t) &dummy_per32->ending_addr) || offset == (addr_t) &dummy_per32->lowcore.words.address) offset = offset*2 + 4; else offset = offset*2; *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; } FixPerRegisters(child); return 0; } static int poke_user_compat(struct task_struct *child, addr_t addr, addr_t data) { if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) return -EIO; return __poke_user_compat(child, addr, data); } long compat_arch_ptrace(struct task_struct *child, compat_long_t request, compat_ulong_t caddr, compat_ulong_t cdata) { unsigned long addr = caddr; unsigned long data = cdata; ptrace_area_emu31 parea; int copied, ret; switch (request) { case PTRACE_PEEKUSR: /* read the word at location addr in the USER area. */ return peek_user_compat(child, addr, data); case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ return poke_user_compat(child, addr, data); case PTRACE_PEEKUSR_AREA: case PTRACE_POKEUSR_AREA: if (copy_from_user(&parea, (void __force __user *) addr, sizeof(parea))) return -EFAULT; addr = parea.kernel_addr; data = parea.process_addr; copied = 0; while (copied < parea.len) { if (request == PTRACE_PEEKUSR_AREA) ret = peek_user_compat(child, addr, data); else { __u32 utmp; if (get_user(utmp, (__u32 __force __user *) data)) return -EFAULT; ret = poke_user_compat(child, addr, utmp); } if (ret) return ret; addr += sizeof(unsigned int); data += sizeof(unsigned int); copied += sizeof(unsigned int); } return 0; } return compat_ptrace_request(child, request, addr, data); } #endif asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) { long ret; /* Do the secure computing check first. */ secure_computing(regs->gprs[2]); /* * The sysc_tracesys code in entry.S stored the system * call number to gprs[2]. */ ret = regs->gprs[2]; if (test_thread_flag(TIF_SYSCALL_TRACE) && (tracehook_report_syscall_entry(regs) || regs->gprs[2] >= NR_syscalls)) { /* * Tracing decided this syscall should not happen or the * debugger stored an invalid system call number. Skip * the system call and the system call restart handling. */ regs->svcnr = 0; ret = -1; } if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) ftrace_syscall_enter(regs); if (unlikely(current->audit_context)) audit_syscall_entry(is_compat_task() ? AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, regs->gprs[2], regs->orig_gpr2, regs->gprs[3], regs->gprs[4], regs->gprs[5]); return ret; } asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) { if (unlikely(current->audit_context)) audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]); if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) ftrace_syscall_exit(regs); if (test_thread_flag(TIF_SYSCALL_TRACE)) tracehook_report_syscall_exit(regs, 0); } /* * user_regset definitions. */ static int s390_regs_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf) { if (target == current) save_access_regs(target->thread.acrs); if (kbuf) { unsigned long *k = kbuf; while (count > 0) { *k++ = __peek_user(target, pos); count -= sizeof(*k); pos += sizeof(*k); } } else { unsigned long __user *u = ubuf; while (count > 0) { if (__put_user(__peek_user(target, pos), u++)) return -EFAULT; count -= sizeof(*u); pos += sizeof(*u); } } return 0; } static int s390_regs_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { int rc = 0; if (target == current) save_access_regs(target->thread.acrs); if (kbuf) { const unsigned long *k = kbuf; while (count > 0 && !rc) { rc = __poke_user(target, pos, *k++); count -= sizeof(*k); pos += sizeof(*k); } } else { const unsigned long __user *u = ubuf; while (count > 0 && !rc) { unsigned long word; rc = __get_user(word, u++); if (rc) break; rc = __poke_user(target, pos, word); count -= sizeof(*u); pos += sizeof(*u); } } if (rc == 0 && target == current) restore_access_regs(target->thread.acrs<