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Boot: Fix undefined Multiboot behaviors

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Both ESP and GDTR are left undefined by the Multiboot specification and
OS images must not rely on these values to be valid. Fix the undefined
behaviors so that booting with PXELINUX does not triple-fault the CPU.
This commit is contained in:
Jean-Baptiste Boric 2021-01-18 20:24:25 +01:00 committed by Andreas Kling
parent cb29dca029
commit 6677ab1ccd
Notes: sideshowbarker 2024-07-18 23:03:29 +09:00 
Author: https://github.com/boricj
Commit: https://github.com/SerenityOS/serenity/commit/6677ab1ccd2
Pull-request: https://github.com/SerenityOS/serenity/pull/5002
1 changed files with 7 additions and 7 deletions
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14
Kernel/Arch/i386/Boot/boot.S
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@ -194,10 +194,13 @@ start:
orl $0x80000000, %eax
movl %eax, %cr0
/* set up stack */
mov $stack_top, %esp
and $-16, %esp
/* jmp to an address above the 3GB mark */
push %cs
push $1f
retf
movl $1f,%eax
jmp *%eax
1:
movl %cr3, %eax
movl %eax, %cr3
@ -212,10 +215,7 @@ start:
addl $8, %edi
loop 1b
/* set up initial stack and jump into C++ land */
mov $stack_top, %esp
and $-16, %esp
/* jump into C++ land */
addl $0xc0000000, %ebx
movl %ebx, multiboot_info_ptr