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[PATCH] x86: Move swsusp __pa() dependent code to arch portion

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o __pa() should be used only on kernel linearly mapped virtual addresses
  and not on kernel text and data addresses.

o Hibernation code needs to determine the physical address associated
  with kernel symbol to mark a section boundary which contains pages which
  don't have to be saved and restored during hibernate/resume operation.

o Move this piece of code in arch dependent section. So that architectures
  which don't have kernel text/data mapped into kernel linearly mapped
  region can come up with their own ways of determining physical addresses
  associated with a kernel text.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Vivek Goyal 2007-05-02 19:27:07 +02:00 committed by Andi Kleen
parent cfd243d4af
commit 49c3df6aaa
6 changed files with 55 additions and 14 deletions
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14
arch/i386/power/suspend.c
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@ -16,6 +16,9 @@
/* Defined in arch/i386/power/swsusp.S */
extern int restore_image(void);
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
/* Pointer to the temporary resume page tables */
pgd_t *resume_pg_dir;
@ -156,3 +159,14 @@ int swsusp_arch_resume(void)
restore_image();
return 0;
}
/*
* pfn_is_nosave - check if given pfn is in the 'nosave' section
*/
int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}

1
arch/powerpc/kernel/Makefile
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@ -37,6 +37,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_6xx) += idle_6xx.o l2cr_6xx.o cpu_setup_6xx.o
obj-$(CONFIG_TAU) += tau_6xx.o
obj32-$(CONFIG_SOFTWARE_SUSPEND) += swsusp_32.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o
obj32-$(CONFIG_MODULES) += module_32.o
ifeq ($(CONFIG_PPC_MERGE),y)

24
arch/powerpc/kernel/suspend.c Normal file
View File

@ -0,0 +1,24 @@
/*
* Suspend support specific for power.
*
* Distribute under GPLv2
*
* Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
*/
#include <asm/page.h>
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
/*
* pfn_is_nosave - check if given pfn is in the 'nosave' section
*/
int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}

14
arch/x86_64/kernel/suspend.c
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@ -13,6 +13,9 @@
#include <asm/page.h>
#include <asm/pgtable.h>
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
struct saved_context saved_context;
unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
@ -220,4 +223,15 @@ int swsusp_arch_resume(void)
restore_image();
return 0;
}
/*
* pfn_is_nosave - check if given pfn is in the 'nosave' section
*/
int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}
#endif /* CONFIG_SOFTWARE_SUSPEND */

5
kernel/power/power.h
View File

@ -23,6 +23,8 @@ static inline int pm_suspend_disk(void)
}
#endif
extern int pfn_is_nosave(unsigned long);
extern struct mutex pm_mutex;
#define power_attr(_name) \
@ -37,9 +39,6 @@ static struct subsys_attribute _name##_attr = { \
extern struct subsystem power_subsys;
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
extern int in_suspend;

11
kernel/power/snapshot.c
View File

@ -650,17 +650,6 @@ static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
static inline unsigned int count_highmem_pages(void) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
* pfn_is_nosave - check if given pfn is in the 'nosave' section
*/
static inline int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}
/**
* saveable - Determine whether a non-highmem page should be included in
* the suspend image.