1 files changed, 544 insertions, 0 deletions

diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
new file mode 100644
index 000000000000..6b7583f497d0
--- /dev/null
+++ b/drivers/pnp/pnpbios/bioscalls.c
@@ -0,0 +1,544 @@
+/*
+ * bioscalls.c - the lowlevel layer of the PnPBIOS driver
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/kernel.h>
+#include <linux/pnpbios.h>
+#include <linux/device.h>
+#include <linux/pnp.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+
+#include <asm/page.h>
+#include <asm/desc.h>
+#include <asm/system.h>
+#include <asm/byteorder.h>
+
+#include "pnpbios.h"
+
+static struct {
+        u16     offset;
+        u16     segment;
+} pnp_bios_callpoint;
+
+
+/* The PnP BIOS entries in the GDT */
+#define PNP_GDT    (GDT_ENTRY_PNPBIOS_BASE * 8)
+
+#define PNP_CS32   (PNP_GDT+0x00)       /* segment for calling fn */
+#define PNP_CS16   (PNP_GDT+0x08)       /* code segment for BIOS */
+#define PNP_DS     (PNP_GDT+0x10)       /* data segment for BIOS */
+#define PNP_TS1    (PNP_GDT+0x18)       /* transfer data segment */
+#define PNP_TS2    (PNP_GDT+0x20)       /* another data segment */
+
+/*
+ * These are some opcodes for a "static asmlinkage"
+ * As this code is *not* executed inside the linux kernel segment, but in a
+ * alias at offset 0, we need a far return that can not be compiled by
+ * default (please, prove me wrong! this is *really* ugly!)
+ * This is the only way to get the bios to return into the kernel code,
+ * because the bios code runs in 16 bit protected mode and therefore can only
+ * return to the caller if the call is within the first 64kB, and the linux
+ * kernel begins at offset 3GB...
+ */
+
+asmlinkage void pnp_bios_callfunc(void);
+
+__asm__(
+        ".text                  \n"
+        __ALIGN_STR "\n"
+        "pnp_bios_callfunc:\n"
+        "       pushl %edx      \n"
+        "       pushl %ecx      \n"
+        "       pushl %ebx      \n"
+        "       pushl %eax      \n"
+        "       lcallw *pnp_bios_callpoint\n"
+        "       addl $16, %esp  \n"
+        "       lret            \n"
+        ".previous              \n"
+);
+
+#define Q_SET_SEL(cpu, selname, address, size) \
+do { \
+set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], __va((u32)(address))); \
+set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
+} while(0)
+
+#define Q2_SET_SEL(cpu, selname, address, size) \
+do { \
+set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], (u32)(address)); \
+set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
+} while(0)
+
+static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
+
+/*
+ * At some point we want to use this stack frame pointer to unwind
+ * after PnP BIOS oopses.
+ */
+
+u32 pnp_bios_fault_esp;
+u32 pnp_bios_fault_eip;
+u32 pnp_bios_is_utter_crap = 0;
+
+static spinlock_t pnp_bios_lock;
+
+
+/*
+ * Support Functions
+ */
+
+static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
+                                u16 arg4, u16 arg5, u16 arg6, u16 arg7,
+                                void *ts1_base, u32 ts1_size,
+                                void *ts2_base, u32 ts2_size)
+{
+        unsigned long flags;
+        u16 status;
+        struct desc_struct save_desc_40;
+        int cpu;
+
+        /*
+         * PnP BIOSes are generally not terribly re-entrant.
+         * Also, don't rely on them to save everything correctly.
+         */
+        if(pnp_bios_is_utter_crap)
+                return PNP_FUNCTION_NOT_SUPPORTED;
+
+        cpu = get_cpu();
+        save_desc_40 = per_cpu(cpu_gdt_table,cpu)[0x40 / 8];
+        per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = bad_bios_desc;
+
+        /* On some boxes IRQ's during PnP BIOS calls are deadly.  */
+        spin_lock_irqsave(&pnp_bios_lock, flags);
+
+        /* The lock prevents us bouncing CPU here */
+        if (ts1_size)
+                Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
+        if (ts2_size)
+                Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
+
+        __asm__ __volatile__(
+                "pushl %%ebp\n\t"
+                "pushl %%edi\n\t"
+                "pushl %%esi\n\t"
+                "pushl %%ds\n\t"
+                "pushl %%es\n\t"
+                "pushl %%fs\n\t"
+                "pushl %%gs\n\t"
+                "pushfl\n\t"
+                "movl %%esp, pnp_bios_fault_esp\n\t"
+                "movl $1f, pnp_bios_fault_eip\n\t"
+                "lcall %5,%6\n\t"
+                "1:popfl\n\t"
+                "popl %%gs\n\t"
+                "popl %%fs\n\t"
+                "popl %%es\n\t"
+                "popl %%ds\n\t"
+                "popl %%esi\n\t"
+                "popl %%edi\n\t"
+                "popl %%ebp\n\t"
+                : "=a" (status)
+                : "0" ((func) | (((u32)arg1) << 16)),
+                  "b" ((arg2) | (((u32)arg3) << 16)),
+                  "c" ((arg4) | (((u32)arg5) << 16)),
+                  "d" ((arg6) | (((u32)arg7) << 16)),
+                  "i" (PNP_CS32),
+                  "i" (0)
+                : "memory"
+        );
+        spin_unlock_irqrestore(&pnp_bios_lock, flags);
+
+        per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = save_desc_40;
+        put_cpu();
+
+        /* If we get here and this is set then the PnP BIOS faulted on us. */
+        if(pnp_bios_is_utter_crap)
+        {
+                printk(KERN_ERR "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
+                printk(KERN_ERR "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
+                printk(KERN_ERR "PnPBIOS: Check with your vendor for an updated BIOS\n");
+        }
+
+        return status;
+}
+
+void pnpbios_print_status(const char * module, u16 status)
+{
+        switch(status) {
+        case PNP_SUCCESS:
+                printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
+                break;
+        case PNP_NOT_SET_STATICALLY:
+                printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", module);
+                break;
+        case PNP_UNKNOWN_FUNCTION:
+                printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", module);
+                break;
+        case PNP_FUNCTION_NOT_SUPPORTED:
+                printk(KERN_ERR "PnPBIOS: %s: function not supported on this system\n", module);
+                break;
+        case PNP_INVALID_HANDLE:
+                printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
+                break;
+        case PNP_BAD_PARAMETER:
+                printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", module);
+                break;
+        case PNP_SET_FAILED:
+                printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", module);
+                break;
+        case PNP_EVENTS_NOT_PENDING:
+                printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
+                break;
+        case PNP_SYSTEM_NOT_DOCKED:
+                printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", module);
+                break;
+        case PNP_NO_ISA_PNP_CARDS:
+                printk(KERN_ERR "PnPBIOS: %s: no isapnp cards are installed on this system\n", module);
+                break;
+        case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
+                printk(KERN_ERR "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", module);
+                break;
+        case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
+                printk(KERN_ERR "PnPBIOS: %s: unable to undock, the system does not have a battery\n", module);
+                break;
+        case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
+                printk(KERN_ERR "PnPBIOS: %s: could not dock due to resource conflicts\n", module);
+                break;
+        case PNP_BUFFER_TOO_SMALL:
+                printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", module);
+                break;
+        case PNP_USE_ESCD_SUPPORT:
+                printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
+                break;
+        case PNP_MESSAGE_NOT_SUPPORTED:
+                printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", module);
+                break;
+        case PNP_HARDWARE_ERROR:
+                printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n", module);
+                break;
+        default:
+                printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, status);
+                break;
+        }
+}
+
+
+/*
+ * PnP BIOS Low Level Calls
+ */
+
+#define PNP_GET_NUM_SYS_DEV_NODES               0x00
+#define PNP_GET_SYS_DEV_NODE                    0x01
+#define PNP_SET_SYS_DEV_NODE                    0x02
+#define PNP_GET_EVENT                           0x03
+#define PNP_SEND_MESSAGE                        0x04
+#define PNP_GET_DOCKING_STATION_INFORMATION     0x05
+#define PNP_SET_STATIC_ALLOCED_RES_INFO         0x09
+#define PNP_GET_STATIC_ALLOCED_RES_INFO         0x0a
+#define PNP_GET_APM_ID_TABLE                    0x0b
+#define PNP_GET_PNP_ISA_CONFIG_STRUC            0x40
+#define PNP_GET_ESCD_INFO                       0x41
+#define PNP_READ_ESCD                           0x42
+#define PNP_WRITE_ESCD                          0x43
+
+/*
+ * Call PnP BIOS with function 0x00, "get number of system device nodes"
+ */
+static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1, PNP_DS, 0, 0,
+                               data, sizeof(struct pnp_dev_node_info), NULL, 0);
+        data->no_nodes &= 0xff;
+        return status;
+}
+
+int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
+{
+        int status = __pnp_bios_dev_node_info( data );
+        if ( status )
+                pnpbios_print_status( "dev_node_info", status );
+        return status;
+}
+
+/*
+ * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
+ * death if they are asked to access the "current" configuration.
+ * Therefore, if it's a matter of indifference, it's better to call
+ * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
+ */
+
+/* 
+ * Call PnP BIOS with function 0x01, "get system device node"
+ * Input: *nodenum = desired node,
+ *        boot = whether to get nonvolatile boot (!=0)
+ *               or volatile current (0) config
+ * Output: *nodenum=next node or 0xff if no more nodes
+ */
+static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        if ( !boot && pnpbios_dont_use_current_config )
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0,
+                               nodenum, sizeof(char), data, 65536);
+        return status;
+}
+
+int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
+{
+        int status;
+        status =  __pnp_bios_get_dev_node( nodenum, boot, data );
+        if ( status )
+                pnpbios_print_status( "get_dev_node", status );
+        return status;
+}
+
+
+/*
+ * Call PnP BIOS with function 0x02, "set system device node"
+ * Input: *nodenum = desired node, 
+ *        boot = whether to set nonvolatile boot (!=0)
+ *               or volatile current (0) config
+ */
+static int __pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        if ( !boot && pnpbios_dont_use_current_config )
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, boot ? 2 : 1, PNP_DS, 0, 0,
+                               data, 65536, NULL, 0);
+        return status;
+}
+
+int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
+{
+        int status;
+        status =  __pnp_bios_set_dev_node( nodenum, boot, data );
+        if ( status ) {
+                pnpbios_print_status( "set_dev_node", status );
+                return status;
+        }
+        if ( !boot ) { /* Update devlist */
+                status =  pnp_bios_get_dev_node( &nodenum, boot, data );
+                if ( status )
+                        return status;
+        }
+        return status;
+}
+
+#if needed
+/*
+ * Call PnP BIOS with function 0x03, "get event"
+ */
+static int pnp_bios_get_event(u16 *event)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0,
+                               event, sizeof(u16), NULL, 0);
+        return status;
+}
+#endif
+
+#if needed
+/*
+ * Call PnP BIOS with function 0x04, "send message"
+ */
+static int pnp_bios_send_message(u16 message)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0);
+        return status;
+}
+#endif
+
+/*
+ * Call PnP BIOS with function 0x05, "get docking station information"
+ */
+int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
+                               data, sizeof(struct pnp_docking_station_info), NULL, 0);
+        return status;
+}
+
+#if needed
+/*
+ * Call PnP BIOS with function 0x09, "set statically allocated resource
+ * information"
+ */
+static int pnp_bios_set_stat_res(char *info)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
+                               info, *((u16 *) info), 0, 0);
+        return status;
+}
+#endif
+
+/*
+ * Call PnP BIOS with function 0x0a, "get statically allocated resource
+ * information"
+ */
+static int __pnp_bios_get_stat_res(char *info)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
+                               info, 65536, NULL, 0);
+        return status;
+}
+
+int pnp_bios_get_stat_res(char *info)
+{
+        int status;
+        status = __pnp_bios_get_stat_res( info );
+        if ( status )
+                pnpbios_print_status( "get_stat_res", status );
+        return status;
+}
+
+#if needed
+/*
+ * Call PnP BIOS with function 0x0b, "get APM id table"
+ */
+static int pnp_bios_apm_id_table(char *table, u16 *size)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0,
+                               table, *size, size, sizeof(u16));
+        return status;
+}
+#endif
+
+/*
+ * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
+ */
+static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return PNP_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
+                               data, sizeof(struct pnp_isa_config_struc), NULL, 0);
+        return status;
+}
+
+int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
+{
+        int status;
+        status = __pnp_bios_isapnp_config( data );
+        if ( status )
+                pnpbios_print_status( "isapnp_config", status );
+        return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x41, "get ESCD info"
+ */
+static int __pnp_bios_escd_info(struct escd_info_struc *data)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return ESCD_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1, PNP_DS,
+                               data, sizeof(struct escd_info_struc), NULL, 0);
+        return status;
+}
+
+int pnp_bios_escd_info(struct escd_info_struc *data)
+{
+        int status;
+        status = __pnp_bios_escd_info( data );
+        if ( status )
+                pnpbios_print_status( "escd_info", status );
+        return status;
+}
+
+/*
+ * Call PnP BIOS function 0x42, "read ESCD"
+ * nvram_base is determined by calling escd_info
+ */
+static int __pnp_bios_read_escd(char *data, u32 nvram_base)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return ESCD_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
+                               data, 65536, __va(nvram_base), 65536);
+        return status;
+}
+
+int pnp_bios_read_escd(char *data, u32 nvram_base)
+{
+        int status;
+        status = __pnp_bios_read_escd( data, nvram_base );
+        if ( status )
+                pnpbios_print_status( "read_escd", status );
+        return status;
+}
+
+#if needed
+/*
+ * Call PnP BIOS function 0x43, "write ESCD"
+ */
+static int pnp_bios_write_escd(char *data, u32 nvram_base)
+{
+        u16 status;
+        if (!pnp_bios_present())
+                return ESCD_FUNCTION_NOT_SUPPORTED;
+        status = call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
+                               data, 65536, __va(nvram_base), 65536);
+        return status;
+}
+#endif
+
+
+/*
+ * Initialization
+ */
+
+void pnpbios_calls_init(union pnp_bios_install_struct *header)
+{
+        int i;
+        spin_lock_init(&pnp_bios_lock);
+        pnp_bios_callpoint.offset = header->fields.pm16offset;
+        pnp_bios_callpoint.segment = PNP_CS16;
+
+        set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
+        _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
+        for(i=0; i < NR_CPUS; i++)
+        {
+                Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
+                Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024);
+                Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024);
+        }
+}