diff options
Diffstat (limited to 'arch/sh/mm/init.c')
| -rw-r--r-- | arch/sh/mm/init.c | 68 |
1 files changed, 53 insertions, 15 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index d5e160da64b..2918c6b1465 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -23,9 +23,7 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); pgd_t swapper_pg_dir[PTRS_PER_PGD]; - -void (*copy_page)(void *from, void *to); -void (*clear_page)(void *to); +unsigned long cached_to_uncached = 0; void show_mem(void) { @@ -102,7 +100,8 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); - flush_tlb_one(get_asid(), addr); + if (cached_to_uncached) + flush_tlb_one(get_asid(), addr); } /* @@ -131,6 +130,37 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) set_pte_phys(address, phys, prot); } + +void __init page_table_range_init(unsigned long start, unsigned long end, + pgd_t *pgd_base) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + int pgd_idx; + unsigned long vaddr; + + vaddr = start & PMD_MASK; + end = (end + PMD_SIZE - 1) & PMD_MASK; + pgd_idx = pgd_index(vaddr); + pgd = pgd_base + pgd_idx; + + for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { + BUG_ON(pgd_none(*pgd)); + pud = pud_offset(pgd, 0); + BUG_ON(pud_none(*pud)); + pmd = pmd_offset(pud, 0); + + if (!pmd_present(*pmd)) { + pte_t *pte_table; + pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); + memset(pte_table, 0, PAGE_SIZE); + pmd_populate_kernel(&init_mm, pmd, pte_table); + } + + vaddr += PMD_SIZE; + } +} #endif /* CONFIG_MMU */ /* @@ -150,6 +180,11 @@ void __init paging_init(void) * check for a null value. */ set_TTB(swapper_pg_dir); + /* Populate the relevant portions of swapper_pg_dir so that + * we can use the fixmap entries without calling kmalloc. + * pte's will be filled in by __set_fixmap(). */ + page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir); + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); for_each_online_node(nid) { @@ -167,9 +202,22 @@ void __init paging_init(void) } free_area_init_nodes(max_zone_pfns); + + /* Set up the uncached fixmap */ + set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start)); + +#ifdef CONFIG_29BIT + /* + * Handle trivial transitions between cached and uncached + * segments, making use of the 1:1 mapping relationship in + * 512MB lowmem. + */ + cached_to_uncached = P2SEG - P1SEG; +#endif } static struct kcore_list kcore_mem, kcore_vmalloc; +int after_bootmem = 0; void __init mem_init(void) { @@ -202,17 +250,7 @@ void __init mem_init(void) memset(empty_zero_page, 0, PAGE_SIZE); __flush_wback_region(empty_zero_page, PAGE_SIZE); - /* - * Setup wrappers for copy/clear_page(), these will get overridden - * later in the boot process if a better method is available. - */ -#ifdef CONFIG_MMU - copy_page = copy_page_slow; - clear_page = clear_page_slow; -#else - copy_page = copy_page_nommu; - clear_page = clear_page_nommu; -#endif + after_bootmem = 1; codesize = (unsigned long) &_etext - (unsigned long) &_text; datasize = (unsigned long) &_edata - (unsigned long) &_etext; |