diff options
Diffstat (limited to 'arch/sparc/mm/highmem.c')
| -rw-r--r-- | arch/sparc/mm/highmem.c | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c index 055c66cf1bf..449f864f0ce 100644 --- a/arch/sparc/mm/highmem.c +++ b/arch/sparc/mm/highmem.c @@ -22,13 +22,31 @@ * shared by CPUs, and so precious, and establishing them requires IPI. * Atomic kmaps are lightweight and we may have NCPUS more of them. */ -#include <linux/mm.h> #include <linux/highmem.h> #include <linux/export.h> -#include <asm/pgalloc.h> +#include <linux/mm.h> + #include <asm/cacheflush.h> #include <asm/tlbflush.h> -#include <asm/fixmap.h> +#include <asm/pgalloc.h> +#include <asm/vaddrs.h> + +pgprot_t kmap_prot; + +static pte_t *kmap_pte; + +void __init kmap_init(void) +{ + unsigned long address; + pmd_t *dir; + + address = __fix_to_virt(FIX_KMAP_BEGIN); + dir = pmd_offset(pgd_offset_k(address), address); + + /* cache the first kmap pte */ + kmap_pte = pte_offset_kernel(dir, address); + kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); +} void *kmap_atomic(struct page *page) { @@ -110,21 +128,3 @@ void __kunmap_atomic(void *kvaddr) pagefault_enable(); } EXPORT_SYMBOL(__kunmap_atomic); - -/* We may be fed a pagetable here by ptep_to_xxx and others. */ -struct page *kmap_atomic_to_page(void *ptr) -{ - unsigned long idx, vaddr = (unsigned long)ptr; - pte_t *pte; - - if (vaddr < SRMMU_NOCACHE_VADDR) - return virt_to_page(ptr); - if (vaddr < PKMAP_BASE) - return pfn_to_page(__nocache_pa(vaddr) >> PAGE_SHIFT); - BUG_ON(vaddr < FIXADDR_START); - BUG_ON(vaddr > FIXADDR_TOP); - - idx = virt_to_fix(vaddr); - pte = kmap_pte - (idx - FIX_KMAP_BEGIN); - return pte_page(*pte); -} |