diff options
| author |   Vivek Goyal <vgoyal@in.ibm.com> | 2007-05-02 19:27:07 +0200 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:07 +0200 |
| commit | 49c3df6aaa6a51071fc135273d1a2515d019099f (patch) | |
| tree | cbd2fb611d14c9c859f7f417dfafae36ebebe29b /arch/x86_64/kernel | |
| parent | [PATCH] x86-64: Remove the identity mapping as early as possible (diff) | |
| download | linux-dev-49c3df6aaa6a51071fc135273d1a2515d019099f.tar.xz linux-dev-49c3df6aaa6a51071fc135273d1a2515d019099f.zip | |
[PATCH] x86: Move swsusp __pa() dependent code to arch portion
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>
Diffstat (limited to 'arch/x86_64/kernel')
| -rw-r--r-- | arch/x86_64/kernel/suspend.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c index fe865ea4df52..4ca523d58a5b 100644 --- a/arch/x86_64/kernel/suspend.c +++ b/arch/x86_64/kernel/suspend.c @@ -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 */ |