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| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:07 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:07 +0100 |
| commit | f62d0f008e889915c93631c04d4c7d871f05bea7 (patch) | |
| tree | 36eb08ed99de278c77ef58df06b282736ff19b08 /arch/x86/mm/pageattr.c | |
| parent | d806e5ee20f62a892b09aa59559f143d465285db (diff) | |
| download | lwn-f62d0f008e889915c93631c04d4c7d871f05bea7.tar.gz lwn-f62d0f008e889915c93631c04d4c7d871f05bea7.zip | |
x86: cpa: set_memory_notpresent()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index fcd96125c5ae..e5910ac37e59 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -357,8 +357,6 @@ int change_page_attr_clear(unsigned long addr, int numpages, pgprot_t prot) return change_page_attr_addr(addr, numpages, prot); } - - int set_memory_uc(unsigned long addr, int numpages) { pgprot_t uncached; @@ -402,7 +400,6 @@ int set_memory_ro(unsigned long addr, int numpages) pgprot_val(rw) = _PAGE_RW; return change_page_attr_clear(addr, numpages, rw); } -EXPORT_SYMBOL(set_memory_ro); int set_memory_rw(unsigned long addr, int numpages) { @@ -411,7 +408,14 @@ int set_memory_rw(unsigned long addr, int numpages) pgprot_val(rw) = _PAGE_RW; return change_page_attr_set(addr, numpages, rw); } -EXPORT_SYMBOL(set_memory_rw); + +int set_memory_np(unsigned long addr, int numpages) +{ + pgprot_t present; + + pgprot_val(present) = _PAGE_PRESENT; + return change_page_attr_clear(addr, numpages, present); +} int set_pages_uc(struct page *page, int numpages) { @@ -461,7 +465,6 @@ int set_pages_ro(struct page *page, int numpages) pgprot_val(rw) = _PAGE_RW; return change_page_attr_clear(addr, numpages, rw); } -EXPORT_SYMBOL(set_pages_ro); int set_pages_rw(struct page *page, int numpages) { @@ -471,8 +474,6 @@ int set_pages_rw(struct page *page, int numpages) pgprot_val(rw) = _PAGE_RW; return change_page_attr_set(addr, numpages, rw); } -EXPORT_SYMBOL(set_pages_rw); - void clflush_cache_range(void *addr, int size) { @@ -503,6 +504,20 @@ void global_flush_tlb(void) EXPORT_SYMBOL(global_flush_tlb); #ifdef CONFIG_DEBUG_PAGEALLOC + +static int __set_pages_p(struct page *page, int numpages) +{ + unsigned long addr = (unsigned long)page_address(page); + return change_page_attr_set(addr, numpages, + __pgprot(_PAGE_PRESENT | _PAGE_RW)); +} + +static int __set_pages_np(struct page *page, int numpages) +{ + unsigned long addr = (unsigned long)page_address(page); + return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_PRESENT)); +} + void kernel_map_pages(struct page *page, int numpages, int enable) { if (PageHighMem(page)) @@ -522,7 +537,10 @@ void kernel_map_pages(struct page *page, int numpages, int enable) * The return value is ignored - the calls cannot fail, * large pages are disabled at boot time: */ - change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); + if (enable) + __set_pages_p(page, numpages); + else + __set_pages_np(page, numpages); /* * We should perform an IPI and flush all tlbs, |