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Verified as working

This commit is contained in:
Michael Brown 2006-05-02 14:04:21 +00:00
parent d081d65d48
commit 5463169c1a
1 changed files with 9 additions and 6 deletions
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15
src/arch/i386/prefix/libprefix.S
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@ -79,9 +79,10 @@ install_block:
*/
.section ".prefix.lib"
.code16
.globl alloc_basemem
alloc_basemem:
/* FBMS => %ax as segment address */
movw $40, %ax
movw $0x40, %ax
movw %ax, %fs
movw %fs:0x13, %ax
shlw $6, %ax
@ -120,6 +121,7 @@ alloc_basemem:
*/
.section ".prefix.lib"
.code16
.globl install_basemem
install_basemem:
/* Preserve registers */
pushw %es
@ -137,7 +139,7 @@ install_basemem:
/* Install .data16 */
movw %bx, %es
xorl %edi, %edi
movl $_data16_load_offset_pgh, %esi
movl $_data16_load_offset, %esi
movl $_data16_progbits_size, %ecx
call install_block
@ -199,7 +201,7 @@ set_segment_limits:
/* Set GDT base and load GDT */
xorl %eax, %eax
movw %cs, %ax
shrl $4, %eax
shll $4, %eax
addl $gdt, %eax
movl %eax, %cs:gdt_base
lgdt %cs:gdt
@ -235,6 +237,7 @@ set_segment_limits:
*/
.section ".prefix.lib"
.code16
.globl install_highmem
install_highmem:
/* Preserve registers and interrupt status */
pushfl
@ -248,10 +251,10 @@ install_highmem:
call set_segment_limits
/* Install .text and .data to specified address */
xorw %ax, %ax
movw %ax, %es
xorw %cx, %cx
movw %cx, %es
movl $_text_load_offset, %esi
movl $_text_and_data_progbits_size, %ecx
movl $_text_progbits_size, %ecx
call install_block
/* Unflatten real mode */