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2006-05-20 Yoshinori K. Okuji <okuji@enbug.org>

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* boot/i386/pc/boot.S (real_start): Set %si earlier to eliminate
        duplication.
        (lba_mode): Use %eax more intensively to reduce the code size.
This commit is contained in:
okuji 2006-05-20 14:54:45 +00:00
parent da2eb1812e
commit 75c8f25836
2 changed files with 15 additions and 11 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2006-05-20 Yoshinori K. Okuji <okuji@enbug.org>
* boot/i386/pc/boot.S (real_start): Set %si earlier to eliminate
duplication.
(lba_mode): Use %eax more intensively to reduce the code size.
2006-05-20 Marco Gerards <marco@gnu.org> 2006-05-20 Marco Gerards <marco@gnu.org>
* normal/lexer.c (grub_script_yylex): Don't filter out newlines. * normal/lexer.c (grub_script_yylex): Don't filter out newlines.

20
boot/i386/pc/boot.S
View file

@ -176,6 +176,9 @@ real_start:
cmpw $0xaa55, %bx cmpw $0xaa55, %bx
jne chs_mode jne chs_mode
/* set %si to the disk address packet */
movw $ABS(disk_address_packet), %si
/* check if AH=0x42 is supported if FORCE_LBA is zero */ /* check if AH=0x42 is supported if FORCE_LBA is zero */
MOV_MEM_TO_AL(ABS(force_lba)) /* movb ABS(force_lba), %al */ MOV_MEM_TO_AL(ABS(force_lba)) /* movb ABS(force_lba), %al */
testb %al, %al testb %al, %al
@ -184,11 +187,13 @@ real_start:
jz chs_mode jz chs_mode
lba_mode: lba_mode:
/* set %si to the disk address packet */ xorl %eax, %eax
movw $ABS(disk_address_packet), %si movw %ax, 4(%si)
movl %eax, 12(%si)
incw %ax
/* set the mode to non-zero */ /* set the mode to non-zero */
movb $1, -1(%si) movb %al, -1(%si)
movl ABS(kernel_sector), %ebx movl ABS(kernel_sector), %ebx
@ -196,7 +201,7 @@ lba_mode:
movw $0x0010, (%si) movw $0x0010, (%si)
/* the blocks */ /* the blocks */
movw $1, 2(%si) movw %ax, 2(%si)
/* the absolute address (low 32 bits) */ /* the absolute address (low 32 bits) */
movl %ebx, 8(%si) movl %ebx, 8(%si)
@ -204,10 +209,6 @@ lba_mode:
/* the segment of buffer address */ /* the segment of buffer address */
movw $GRUB_BOOT_MACHINE_BUFFER_SEG, 6(%si) movw $GRUB_BOOT_MACHINE_BUFFER_SEG, 6(%si)
xorl %eax, %eax
movw %ax, 4(%si)
movl %eax, 12(%si)
/* /*
* BIOS call "INT 0x13 Function 0x42" to read sectors from disk into memory * BIOS call "INT 0x13 Function 0x42" to read sectors from disk into memory
* Call with %ah = 0x42 * Call with %ah = 0x42
@ -245,9 +246,6 @@ chs_mode:
jmp hd_probe_error jmp hd_probe_error
final_init: final_init:
movw $ABS(sectors), %si
/* set the mode to zero */ /* set the mode to zero */
movb $0, -1(%si) movb $0, -1(%si)