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add extended regs support in bios_interrupt

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-01-17 21:16:05 +01:00
parent eb3f57d3c4
commit 1453b2ec7f
3 changed files with 97 additions and 72 deletions
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28
disk/i386/pc/biosdisk.c
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@ -33,29 +33,29 @@ static int grub_biosdisk_rw_int13_extensions (int ah, int drive, void *dap);
static int grub_biosdisk_get_num_floppies (void)
{
struct grub_cpu_int_registers regs;
struct grub_bios_int_registers regs;
int drive;
/* reset the disk system first */
regs.ax = 0;
regs.dx = 0;
regs.eax = 0;
regs.edx = 0;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_cpu_interrupt (0x13, &regs);
grub_bios_interrupt (0x13, &regs);
for (drive = 0; drive < 2; drive++)
{
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT | GRUB_CPU_INT_FLAGS_CARRY;
regs.dx = drive;
regs.edx = drive;
/* call GET DISK TYPE */
regs.ax = 0x1500;
grub_cpu_interrupt (0x13, &regs);
regs.eax = 0x1500;
grub_bios_interrupt (0x13, &regs);
if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
break;
/* check if this drive exists */
if (!(regs.ax & 0x300))
if (!(regs.eax & 0x300))
break;
}
@ -71,16 +71,16 @@ static int grub_biosdisk_get_num_floppies (void)
static int
grub_biosdisk_rw_int13_extensions (int ah, int drive, void *dap)
{
struct grub_cpu_int_registers regs;
regs.ax = ah << 8;
struct grub_bios_int_registers regs;
regs.eax = ah << 8;
/* compute the address of disk_address_packet */
regs.ds = (((grub_addr_t) dap) & 0xffff0000) >> 4;
regs.si = (((grub_addr_t) dap) & 0xffff);
regs.dx = drive;
regs.esi = (((grub_addr_t) dap) & 0xffff);
regs.edx = drive;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_cpu_interrupt (0x13, &regs);
return regs.ax >> 8;
grub_bios_interrupt (0x13, &regs);
return (regs.eax >> 8) & 0xff;
}
static int