Make struct boot_params a real structure, and remove obsolete fields

Make struct boot_params a real structure, and remove the handling of
some obsolete fields, in particular hd*_info, which was only used by
the ST-506 driver, and likely to be wrong for that driver on any
modern BIOS.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 91 insertions, 4 deletions

diff --git a/include/asm-i386/bootparam.h b/include/asm-i386/bootparam.h
new file mode 100644
index 000000000000..427d8652bfde
--- /dev/null
+++ b/include/asm-i386/bootparam.h
@@ -0,0 +1,85 @@
+#ifndef _ASM_BOOTPARAM_H
+#define _ASM_BOOTPARAM_H
+
+#include <linux/types.h>
+#include <linux/screen_info.h>
+#include <linux/apm_bios.h>
+#include <asm/e820.h>
+#include <linux/edd.h>
+#include <video/edid.h>
+
+struct setup_header {
+        u8      setup_sects;
+        u16     root_flags;
+        u32     syssize;
+        u16     ram_size;
+        u16     vid_mode;
+        u16     root_dev;
+        u16     boot_flag;
+        u16     jump;
+        u32     header;
+        u16     version;
+        u32     realmode_swtch;
+        u16     start_sys;
+        u16     kernel_version;
+        u8      type_of_loader;
+        u8      loadflags;
+#define LOADED_HIGH     0x01
+#define CAN_USE_HEAP    0x80
+        u16     setup_move_size;
+        u32     code32_start;
+        u32     ramdisk_image;
+        u32     ramdisk_size;
+        u32     bootsect_kludge;
+        u16     heap_end_ptr;
+        u16     _pad1;
+        u32     cmd_line_ptr;
+        u32     initrd_addr_max;
+        u32     kernel_alignment;
+        u8      relocatable_kernel;
+} __attribute__((packed));
+
+struct sys_desc_table {
+        u16 length;
+        u8  table[14];
+};
+
+struct efi_info {
+        u32 _pad1;
+        u32 efi_systab;
+        u32 efi_memdesc_size;
+        u32 efi_memdec_version;
+        u32 efi_memmap;
+        u32 fi_memmap_size;
+        u32 _pad2[2];
+};
+
+/* The so-called "zeropage" */
+struct boot_params {
+        struct screen_info screen_info;                 /* 0x000 */
+        struct apm_bios_info apm_bios_info;             /* 0x040 */
+        u8  _pad2[12];                                  /* 0x054 */
+        u32 speedstep_info[4];                          /* 0x060 */
+        u8  _pad3[16];                                  /* 0x070 */
+        u8  hd0_info[16];       /* obsolete! */         /* 0x080 */
+        u8  hd1_info[16];       /* obsolete! */         /* 0x090 */
+        struct sys_desc_table sys_desc_table;           /* 0x0a0 */
+        u8  _pad4[144];                                 /* 0x0b0 */
+        struct edid_info edid_info;                     /* 0x140 */
+        struct efi_info efi_info;                       /* 0x1c0 */
+        u32 alt_mem_k;                                  /* 0x1e0 */
+        u32 scratch;            /* Scratch field! */    /* 0x1e4 */
+        u8  e820_entries;                               /* 0x1e8 */
+        u8  eddbuf_entries;                             /* 0x1e9 */
+        u8  edd_mbr_sig_buf_entries;                    /* 0x1ea */
+        u8  _pad6[6];                                   /* 0x1eb */
+        struct setup_header hdr;    /* setup header */  /* 0x1f1 */
+        u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];
+        u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];        /* 0x290 */
+        struct e820entry e820_map[E820MAX];             /* 0x2d0 */
+        u8  _pad8[48];                                  /* 0xcd0 */
+        struct edd_info eddbuf[EDDMAXNR];               /* 0xd00 */
+        u8  _pad9[276];                                 /* 0xeec */
+} __attribute__((packed));
+
+#endif /* _ASM_BOOTPARAM_H */
diff --git a/include/asm-i386/setup.h b/include/asm-i386/setup.h
index 0e8077cbfdac..0d5bff9dc4a5 100644
--- a/include/asm-i386/setup.h
+++ b/include/asm-i386/setup.h
@@ -26,12 +26,15 @@
 #define NEW_CL_POINTER          0x228   /* Relative to real mode data */
 
 #ifndef __ASSEMBLY__
+
+#include <asm/bootparam.h>
+
 /*
  * This is set up by the setup-routine at boot-time
  */
-extern unsigned char boot_params[PARAM_SIZE];
+extern struct boot_params boot_params;
 
-#define PARAM   (boot_params)
+#define PARAM   ((char *)&boot_params)
 #define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
 #define EXT_MEM_K (*(unsigned short *) (PARAM+2))
 #define ALT_MEM_K (*(unsigned long *) (PARAM+0x1e0))
@@ -39,8 +42,7 @@ extern unsigned char boot_params[PARAM_SIZE];
 #define E820_MAP    ((struct e820entry *) (PARAM+E820MAP))
 #define APM_BIOS_INFO (*(struct apm_bios_info *) (PARAM+0x40))
 #define IST_INFO   (*(struct ist_info *) (PARAM+0x60))
-#define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
-#define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0xa0))
+#define SYS_DESC_TABLE (*(struct sys_desc_table *)(PARAM+0xa0))
 #define EFI_SYSTAB ((efi_system_table_t *) *((unsigned long *)(PARAM+0x1c4)))
 #define EFI_MEMDESC_SIZE (*((unsigned long *) (PARAM+0x1c8)))
 #define EFI_MEMDESC_VERSION (*((unsigned long *) (PARAM+0x1cc)))