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Bootloader: Implement better memset and memcpy for 32 bit addresses

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Bananymous
2024-04-20 17:57:16 +03:00
parent 0e405755ad
commit 9ac3f48fcb
6 changed files with 138 additions and 43 deletions
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12
bootloader/bios/boot.S
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@@ -1,3 +1,5 @@
.include "common.S"
.code16
#########################################
@@ -103,12 +105,12 @@ stage2_main:
movl %edx, %cr0
# jump to protected mode
ljmpl $0x18, $protected_mode
ljmpl $GDT_CODE32, $protected_mode
.code32
protected_mode:
# setup protected mode segments
movw $0x10, %dx
movw $GDT_DATA32, %dx
movw %dx, %ds
movw %dx, %es
movw %dx, %fs
@@ -127,15 +129,15 @@ enter_unreal_mode:
movl %cr0, %eax
orb $1, %al
movl %eax, %cr0
ljmpl $0x8, $.enter_unreal_mode_pmode
ljmpl $GDT_CODE16, $.enter_unreal_mode_pmode
.enter_unreal_mode_pmode:
movw $0x10, %bx
movw $GDT_DATA32, %bx
movw %bx, %ds
andb $0xFE, %al
movl %eax, %cr0
ljmpl $0x0, $.enter_unreal_mode_unreal
ljmpl $0x00, $.enter_unreal_mode_unreal
.enter_unreal_mode_unreal:
popw %ds