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x86: use invd instead of wbinvd in real mode start code

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I do not know why the boot code immediately after the system reset
should write-back the cache content. I think the cache invalidation
should be enough.

I tested this commit with qemu-x86_defconfig, and it worked for me.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Masahiro Yamada
2020-01-08 20:08:44 +09:00
committed by Bin Meng
parent a6302b7085
commit 0d67fac29f
2 changed files with 2 additions and 2 deletions
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2
arch/x86/cpu/start.S
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@@ -50,7 +50,7 @@ _x86boot_start:
movl %cr0, %eax movl %cr0, %eax
orl $(X86_CR0_NW | X86_CR0_CD), %eax orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0 movl %eax, %cr0
wbinvd invd
/* /*
* Zero the BIST (Built-In Self Test) value since we don't have it. * Zero the BIST (Built-In Self Test) value since we don't have it.

2
arch/x86/cpu/start16.S
View File

@@ -28,7 +28,7 @@ start16:
movl %cr0, %eax movl %cr0, %eax
orl $(X86_CR0_NW | X86_CR0_CD), %eax orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0 movl %eax, %cr0
wbinvd invd
/* load the temporary Global Descriptor Table */ /* load the temporary Global Descriptor Table */
data32 cs lidt idt_ptr data32 cs lidt idt_ptr