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Fix up LBA support.

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gord 1999-03-10 15:33:14 +00:00
parent d34ac5a182
commit 3f99b1e9c0
3 changed files with 18 additions and 7 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
1999-03-10 Gordon Matzigkeit <gord@trick.fig.org>
* shared_src/asm.S (biosdisk): Make LBA mode work correctly. From
OKUJI Yoshinori.
Unconditionally define NO_INT13_FALLBACK until we release GRUB
0.6. This will help debug any problems with the LBA support until
then.
1999-03-09 Gordon Matzigkeit <gord@trick.fig.org>
* shared_src/asm.S (biosdisk): Compute location of

2
NEWS
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@ -1,7 +1,7 @@
NEWS - list of user-visible changes between releases of GRUB
New in XXX:
* Preliminary LBA and AWARD BIOS disk extension support. Please
* LBA and AWARD BIOS disk extension support. Please
contact bug-grub@gnu.org if you know you have a machine for which
this support would be useful, and would like to help in debugging.

15
shared_src/asm.S
View file

@ -355,7 +355,7 @@ ENTRY(biosdisk)
/* Check whether we have LBA. */
movb 0x13(%ebp), %al
shrb $4, %al
andb $0x10, %al
jz disk_compute_args /* nope. */
/* set up disk address packet for extended calls (LBA mode) */
@ -370,12 +370,13 @@ ENTRY(biosdisk)
/* set up the buffer address */
xorl %eax, %eax
movw 0x1c(%ebp), %ax /* segment */
shll $4, %eax
shll $16, %eax
movl %eax, dap_buffer
/* compute the address of disk_address_packet */
movl $disk_address_packet, %eax
movw %ax, %si
xorw %ax, %ax
shrl $4, %eax
movw %ax, %cx /* save the segment to cx */
@ -392,6 +393,8 @@ ENTRY(biosdisk)
movw %bx, %ax
int $0x13 /* do the operation */
/* FIXME: force people to help test LBA support before releasing 0.6 */
#define NO_INT13_FALLBACK 1
#ifdef NO_INT13_FALLBACK
/* Save return value. */
movb %ah, %bl
@ -623,11 +626,11 @@ hard_drive:
jc 1f /* invalid function */
cmpw $0xaa55, %bx
data32
jnz 1f /* failed magic */
jne 1f /* failed magic */
andb $1, %cx
data32
jnz 1f /* LBA not supported */
jz 1f /* LBA not supported */
/* Wahoo! Got LBA! */
movb $0x1, %bh
@ -657,8 +660,8 @@ probe_success:
#ifdef AWARD_INT13_EXTENSIONS
movb %dh, %al /* bits 10,11 of cylinder count */
andb $0xc0, %al
shlw $2, %ax /* << 2 */
#endif
shlw $2, %ax /* << 2 */
movb %cl, %al /* bits 8,9 of cylinder count */
andb $0xc0, %al
shlw $2, %ax /* << 2 */