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Kernel/x86_64: Halt if we happen to boot on non-x86_64 machine

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Liav A 2021-07-03 19:17:22 +03:00 committed by Gunnar Beutner
parent e0cf6f3cf0
commit 458ac9bbba
Notes: sideshowbarker 2024-07-18 11:03:21 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/458ac9bbbae
Pull-request: https://github.com/SerenityOS/serenity/pull/8406
Reviewed-by: https://github.com/gunnarbeutner ✅
1 changed files with 17 additions and 0 deletions
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17
Kernel/Arch/x86/x86_64/Boot/boot.S
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@ -101,6 +101,23 @@ start:
cli
cld
/* test for long mode presence, save the most important registers from corruption */
pushl %eax
pushl %edx
pushl %ebx
movl $0x80000001, %eax
cpuid
testl $(1 << 29), %edx /* Test if the LM-bit, which is bit 29, is set in the edx register. */
jnz continue /* If LM-bit is not enabled, there is no long mode. */
hlt
continue:
/* restore the pushed registers */
popl %ebx
popl %edx
popl %eax
/* We don't know where the bootloader might have put the command line.
* It might be at an inconvenient location that we're not about to map,
* so let's just copy it to a convenient location while we have the whole