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| author | David Woodhouse <dwmw2@infradead.org> | 2007-01-18 10:34:51 +1100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-01-18 10:34:51 +1100 |
| commit | 9cdf083f981b8d37b3212400a359368661385099 (patch) | |
| tree | aa15a6a08ad87e650dea40fb59b3180bef0d345b /include/asm-s390/page.h | |
| parent | e499e01d234a31d59679b7b1e1cf628d917ba49a (diff) | |
| parent | a8b3485287731978899ced11f24628c927890e78 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-s390/page.h')
| -rw-r--r-- | include/asm-s390/page.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h index 363ea761d5e..05ea6f17278 100644 --- a/include/asm-s390/page.h +++ b/include/asm-s390/page.h @@ -127,6 +127,26 @@ page_get_storage_key(unsigned long addr) return skey; } +extern unsigned long max_pfn; + +static inline int pfn_valid(unsigned long pfn) +{ + unsigned long dummy; + int ccode; + + if (pfn >= max_pfn) + return 0; + + asm volatile( + " lra %0,0(%2)\n" + " ipm %1\n" + " srl %1,28\n" + : "=d" (dummy), "=d" (ccode) + : "a" (pfn << PAGE_SHIFT) + : "cc"); + return !ccode; +} + #endif /* !__ASSEMBLY__ */ /* to align the pointer to the (next) page boundary */ @@ -138,8 +158,6 @@ page_get_storage_key(unsigned long addr) #define __va(x) (void *)(unsigned long)(x) #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) - -#define pfn_valid(pfn) ((pfn) < max_mapnr) #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ |