diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-parisc/pgalloc.h |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-parisc/pgalloc.h')
-rw-r--r-- | include/asm-parisc/pgalloc.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/include/asm-parisc/pgalloc.h b/include/asm-parisc/pgalloc.h new file mode 100644 index 000000000000..6291d6692e5d --- /dev/null +++ b/include/asm-parisc/pgalloc.h @@ -0,0 +1,143 @@ +#ifndef _ASM_PGALLOC_H +#define _ASM_PGALLOC_H + +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/fixmap.h> + +#include <asm/cache.h> + +/* Allocate the top level pgd (page directory) + * + * Here (for 64 bit kernels) we implement a Hybrid L2/L3 scheme: we + * allocate the first pmd adjacent to the pgd. This means that we can + * subtract a constant offset to get to it. The pmd and pgd sizes are + * arranged so that a single pmd covers 4GB (giving a full LP64 + * process access to 8TB) so our lookups are effectively L2 for the + * first 4GB of the kernel (i.e. for all ILP32 processes and all the + * kernel for machines with under 4GB of memory) */ +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, + PGD_ALLOC_ORDER); + pgd_t *actual_pgd = pgd; + + if (likely(pgd != NULL)) { + memset(pgd, 0, PAGE_SIZE<<PGD_ALLOC_ORDER); +#ifdef __LP64__ + actual_pgd += PTRS_PER_PGD; + /* Populate first pmd with allocated memory. We mark it + * with PxD_FLAG_ATTACHED as a signal to the system that this + * pmd entry may not be cleared. */ + __pgd_val_set(*actual_pgd, (PxD_FLAG_PRESENT | + PxD_FLAG_VALID | + PxD_FLAG_ATTACHED) + + (__u32)(__pa((unsigned long)pgd) >> PxD_VALUE_SHIFT)); + /* The first pmd entry also is marked with _PAGE_GATEWAY as + * a signal that this pmd may not be freed */ + __pgd_val_set(*pgd, PxD_FLAG_ATTACHED); +#endif + } + return actual_pgd; +} + +static inline void pgd_free(pgd_t *pgd) +{ +#ifdef __LP64__ + pgd -= PTRS_PER_PGD; +#endif + free_pages((unsigned long)pgd, PGD_ALLOC_ORDER); +} + +#if PT_NLEVELS == 3 + +/* Three Level Page Table Support for pmd's */ + +static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd) +{ + __pgd_val_set(*pgd, (PxD_FLAG_PRESENT | PxD_FLAG_VALID) + + (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)); +} + +static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) +{ + pmd_t *pmd = (pmd_t *)__get_free_pages(GFP_KERNEL|__GFP_REPEAT, + PMD_ORDER); + if (pmd) + memset(pmd, 0, PAGE_SIZE<<PMD_ORDER); + return pmd; +} + +static inline void pmd_free(pmd_t *pmd) +{ +#ifdef __LP64__ + if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED) + /* This is the permanent pmd attached to the pgd; + * cannot free it */ + return; +#endif + free_pages((unsigned long)pmd, PMD_ORDER); +} + +#else + +/* Two Level Page Table Support for pmd's */ + +/* + * allocating and freeing a pmd is trivial: the 1-entry pmd is + * inside the pgd, so has no extra memory associated with it. + */ + +#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); }) +#define pmd_free(x) do { } while (0) +#define pgd_populate(mm, pmd, pte) BUG() + +#endif + +static inline void +pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) +{ +#ifdef __LP64__ + /* preserve the gateway marker if this is the beginning of + * the permanent pmd */ + if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED) + __pmd_val_set(*pmd, (PxD_FLAG_PRESENT | + PxD_FLAG_VALID | + PxD_FLAG_ATTACHED) + + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)); + else +#endif + __pmd_val_set(*pmd, (PxD_FLAG_PRESENT | PxD_FLAG_VALID) + + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)); +} + +#define pmd_populate(mm, pmd, pte_page) \ + pmd_populate_kernel(mm, pmd, page_address(pte_page)) + +static inline struct page * +pte_alloc_one(struct mm_struct *mm, unsigned long address) +{ + struct page *page = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + return page; +} + +static inline pte_t * +pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) +{ + pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + return pte; +} + +static inline void pte_free_kernel(pte_t *pte) +{ + free_page((unsigned long)pte); +} + +#define pte_free(page) pte_free_kernel(page_address(page)) + +extern int do_check_pgt_cache(int, int); +#define check_pgt_cache() do { } while (0) + +#endif |