1#ifndef __ASM_SH_PGTABLE_2LEVEL_H 2#define __ASM_SH_PGTABLE_2LEVEL_H 3 4/* 5 * traditional two-level paging structure: 6 */ 7 8#define PGDIR_SHIFT 22 9#define PTRS_PER_PGD 1024 10 11/* 12 * this is two-level, so we don't really have any 13 * PMD directory physically. 14 */ 15#define PMD_SHIFT 22 16#define PTRS_PER_PMD 1 17 18#define PTRS_PER_PTE 1024 19 20#ifndef __ASSEMBLY__ 21#define pte_ERROR(e) \ 22 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 23#define pmd_ERROR(e) \ 24 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 25#define pgd_ERROR(e) \ 26 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 27 28/* 29 * The "pgd_xxx()" functions here are trivial for a folded two-level 30 * setup: the pgd is never bad, and a pmd always exists (as it's folded 31 * into the pgd entry) 32 */ 33static inline int pgd_none(pgd_t pgd) { return 0; } 34static inline int pgd_bad(pgd_t pgd) { return 0; } 35static inline int pgd_present(pgd_t pgd) { return 1; } 36static inline void pgd_clear (pgd_t * pgdp) { } 37 38/* 39 * Certain architectures need to do special things when PTEs 40 * within a page table are directly modified. Thus, the following 41 * hook is made available. 42 */ 43#define set_pte(pteptr, pteval) (*(pteptr) = pteval) 44/* 45 * (pmds are folded into pgds so this doesn't get actually called, 46 * but the define is needed for a generic inline function.) 47 */ 48#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) 49#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval) 50 51#define pgd_page(pgd) \ 52((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) 53 54static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) 55{ 56 return (pmd_t *) dir; 57} 58#endif /* !__ASSEMBLY__ */ 59 60#endif /* __ASM_SH_PGTABLE_2LEVEL_H */ 61