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Date: Fri, 8 Feb 2008 23:01:51 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Pavel Machek <pavel@....cz>
Cc: "H. Peter Anvin" <hpa@...or.com>,
kernel list <linux-kernel@...r.kernel.org>,
Linux-pm mailing list <linux-pm@...ts.osdl.org>
Subject: Re: [rft] s2ram wakeup moves to .c, could fix few machines
On Friday, 8 of February 2008, Pavel Machek wrote:
> Hi!
>
> Rafael, this is for you.
Thanks.
> My cleanups, relative to your cleanup patch. You may need manual patching
> around rep/stosd.
OK, I'll try to merge it.
Rafael
> diff --git a/arch/x86/kernel/acpi/realmode/Makefile b/arch/x86/kernel/acpi/realmode/Makefile
> index b239f0f..0e4742b 100644
> --- a/arch/x86/kernel/acpi/realmode/Makefile
> +++ b/arch/x86/kernel/acpi/realmode/Makefile
> @@ -46,7 +46,10 @@ KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__AS
> WAKEUP_OBJS = $(addprefix $(obj)/,$(wakeup-y))
>
> LDFLAGS_wakeup.elf := -T
> -$(obj)/wakeup.elf: $(src)/wakeup.ld $(WAKEUP_OBJS) FORCE
> +
> +CPPFLAGS_wakeup.lds += -P -C
> +
> +$(obj)/wakeup.elf: $(src)/wakeup.lds $(WAKEUP_OBJS) FORCE
> $(call if_changed,ld)
>
> OBJCOPYFLAGS_wakeup.bin := -O binary
> diff --git a/arch/x86/kernel/acpi/realmode/wakeup.S b/arch/x86/kernel/acpi/realmode/wakeup.S
> index 26145c0..edff763 100644
> --- a/arch/x86/kernel/acpi/realmode/wakeup.S
> +++ b/arch/x86/kernel/acpi/realmode/wakeup.S
> @@ -56,14 +56,6 @@ _start:
> cmpl $0x65a22c82, %eax
> jne bogus_real_magic
>
> - /* Zero the bss */
> - xorl %eax, %eax
> - movw $__bss_start, %di
> - movw $__bss_end + 3, %cx
> - subw %di, %cx
> - shrw $2, %cx
> - rep; stosl
> -
> /* Call the C code */
> calll main
>
> diff --git a/arch/x86/kernel/acpi/realmode/wakeup.h b/arch/x86/kernel/acpi/realmode/wakeup.h
> index 4a26e27..6a49435 100644
> --- a/arch/x86/kernel/acpi/realmode/wakeup.h
> +++ b/arch/x86/kernel/acpi/realmode/wakeup.h
> @@ -6,12 +6,11 @@
> #ifndef ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
> #define ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
>
> +#ifndef __ASSEMBLY__
> #include <linux/types.h>
>
> /* This must match data at wakeup.S */
> struct wakeup_header {
> - u16 entry; /* unused */
> - u16 total; /* unused */
> u16 video_mode; /* Video mode number */
> u16 _jmp1;
> u32 pmode_entry; /* Protected mode resume point */
> @@ -27,5 +26,10 @@ struct wakeup_header {
> u16 trampoline_segment;
> u32 signature; /* To check we have correct structure */
> } __attribute__((__packed__));
> +#endif
> +
> +#define HEADER_OFFSET 0x3f00
> +#define WAKEUP_SIZE 0x4000
> +
>
> #endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
> diff --git a/arch/x86/kernel/acpi/realmode/wakeup.ld b/arch/x86/kernel/acpi/realmode/wakeup.ld
> deleted file mode 100644
> index 5dff2f0..0000000
> --- a/arch/x86/kernel/acpi/realmode/wakeup.ld
> +++ /dev/null
> @@ -1,51 +0,0 @@
> -/*
> - * wakeup.ld
> - *
> - * Linker script for the real-mode wakeup code
> - */
> -OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
> -OUTPUT_ARCH(i386)
> -ENTRY(_start)
> -
> -SECTIONS
> -{
> - . = 0x3f00;
> - .header : { *(.header) }
> -
> - . = 0;
> - .text : { *(.text*) }
> -
> - . = ALIGN(16);
> - .rodata : { *(.rodata*) }
> -
> - .videocards : {
> - video_cards = .;
> - *(.videocards)
> - video_cards_end = .;
> - }
> -
> - . = ALIGN(16);
> - .data : { *(.data*) }
> -
> - .signature : {
> - end_signature = .;
> - LONG(0x65a22c82)
> - }
> -
> - . = ALIGN(16);
> - .bss :
> - {
> - __bss_start = .;
> - *(.bss)
> - __bss_end = .;
> - }
> -
> - . = ALIGN(16);
> - _end = .;
> -
> - /DISCARD/ : { *(.note*) }
> -
> - /* Adjust this as appropriate */
> - /* This allows 4 pages (16K) */
> - . = ASSERT(_end <= 0x4000, "Wakeup too big!");
> -}
> diff --git a/arch/x86/kernel/acpi/realmode/wakeup.lds.S b/arch/x86/kernel/acpi/realmode/wakeup.lds.S
> new file mode 100644
> index 0000000..22fab6c
> --- /dev/null
> +++ b/arch/x86/kernel/acpi/realmode/wakeup.lds.S
> @@ -0,0 +1,61 @@
> +/*
> + * wakeup.ld
> + *
> + * Linker script for the real-mode wakeup code
> + */
> +#undef i386
> +#include "wakeup.h"
> +
> +OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
> +OUTPUT_ARCH(i386)
> +ENTRY(_start)
> +
> +SECTIONS
> +{
> + . = HEADER_OFFSET;
> + .header : {
> + *(.header)
> + }
> +
> + . = 0;
> + .text : {
> + *(.text*)
> + }
> +
> + . = ALIGN(16);
> + .rodata : {
> + *(.rodata*)
> + }
> +
> + .videocards : {
> + video_cards = .;
> + *(.videocards)
> + video_cards_end = .;
> + }
> +
> + . = ALIGN(16);
> + .data : {
> + *(.data*)
> + }
> +
> + .signature : {
> + end_signature = .;
> + LONG(0x65a22c82)
> + }
> +
> + . = ALIGN(16);
> + .bss : {
> + __bss_start = .;
> + *(.bss)
> + __bss_end = .;
> + }
> +
> + . = ALIGN(16);
> + _end = .;
> +
> + /DISCARD/ : {
> + *(.note*)
> + }
> +
> + . = ASSERT(_end <= WAKEUP_SIZE, "Wakeup too big!");
> +}
> diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
> index 1b282b1..561565e 100644
> --- a/arch/x86/kernel/acpi/sleep.c
> +++ b/arch/x86/kernel/acpi/sleep.c
> @@ -53,9 +53,9 @@ int acpi_save_state_mem(void)
> "S3 disabled\n");
> return -ENOMEM;
> }
> - memcpy((void *)acpi_realmode, &wakeup_code_start, 4*PAGE_SIZE);
> + memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
>
> - header = (struct wakeup_header *)(acpi_realmode + 0x3f00);
> + header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
> if (header->signature != 0x51ee1111) {
> printk(KERN_ERR "wakeup header does not match\n");
> return -EINVAL;
> @@ -111,13 +111,13 @@ void acpi_restore_state_mem(void)
> */
> void __init acpi_reserve_bootmem(void)
> {
> - if ((&wakeup_code_end - &wakeup_code_start) > PAGE_SIZE*4) {
> + if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
> printk(KERN_ERR
> "ACPI: Wakeup code way too big, S3 disabled.\n");
> return;
> }
>
> - acpi_realmode = (unsigned long)alloc_bootmem_low(PAGE_SIZE*4);
> + acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
>
> if (!acpi_realmode) {
> printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
>
>
--
"Premature optimization is the root of all evil." - Donald Knuth
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