Messages in this thread Patch in this message | | | Date | Thu, 14 Apr 2005 22:35:57 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH] Fix reloading GDT on ACPI S3 wakeup (fwd) |
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Hi!
> This patch - based on > http://marc.theaimsgroup.com/?l=linux-kernel&m=110055503031009&w=2 - > makes ACPI S3 wakeup work for me on a ThinkPad T40p laptop with a SMP > kernel. Without it only UP kernels work. I've been using the patch for > three months now without any issues. > > The ACPI resume code currently uses a real-mode 16-bit lgdt instruction > to reload the GDT. This only restores the lower 24 bits of the GDT base > address. In recent SMP kernels, the GDT seems to have moved out of the > lower 16 megs, thereby causing the ACPI resume to fail -- an invalid GDT > was being loaded. >
Actually x86-64 needs this, too. Any testers? Pavel
--- clean/arch/x86_64/kernel/acpi/wakeup.S 2005-01-22 21:24:51.000000000 +0100 +++ linux/arch/x86_64/kernel/acpi/wakeup.S 2005-04-14 22:34:18.000000000 +0200 @@ -67,7 +67,7 @@ shll $4, %eax addl $(gdta - wakeup_code), %eax movl %eax, gdt_48a +2 - wakeup_code - lgdt %ds:gdt_48a - wakeup_code # load gdt with whatever is + lgdtl %ds:gdt_48a - wakeup_code # load gdt with whatever is # appropriate movl $1, %eax # protected mode (PE) bit
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