diff options
Diffstat (limited to 'arch/parisc/mm/kmap.c')
| -rw-r--r-- | arch/parisc/mm/kmap.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/parisc/mm/kmap.c b/arch/parisc/mm/kmap.c new file mode 100644 index 000000000000..1b1acd5e2f6e --- /dev/null +++ b/arch/parisc/mm/kmap.c @@ -0,0 +1,166 @@ +/* + * kmap/page table map and unmap support routines + * + * Copyright 1999,2000 Hewlett-Packard Company + * Copyright 2000 John Marvin <jsm at hp.com> + * Copyright 2000 Grant Grundler <grundler at parisc-linux.org> + * Copyright 2000 Philipp Rumpf <prumpf@tux.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +/* +** Stolen mostly from arch/parisc/kernel/pci-dma.c +*/ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pci.h> + +#include <linux/slab.h> +#include <linux/vmalloc.h> + +#include <asm/uaccess.h> +#include <asm/pgalloc.h> + +#include <asm/io.h> +#include <asm/page.h> /* get_order */ + +#undef flush_cache_all +#define flush_cache_all flush_all_caches + +typedef void (*pte_iterator_t) (pte_t * pte, unsigned long arg); + +#if 0 +/* XXX This routine could be used with iterate_page() to replace + * unmap_uncached_page() and save a little code space but I didn't + * do that since I'm not certain whether this is the right path. -PB + */ +static void unmap_cached_pte(pte_t * pte, unsigned long addr, unsigned long arg) +{ + pte_t page = *pte; + pte_clear(&init_mm, addr, pte); + if (!pte_none(page)) { + if (pte_present(page)) { + unsigned long map_nr = pte_pagenr(page); + if (map_nr < max_mapnr) + __free_page(mem_map + map_nr); + } else { + printk(KERN_CRIT + "Whee.. Swapped out page in kernel page table\n"); + } + } +} +#endif + +/* These two routines should probably check a few things... */ +static void set_uncached(pte_t * pte, unsigned long arg) +{ + pte_val(*pte) |= _PAGE_NO_CACHE; +} + +static void set_cached(pte_t * pte, unsigned long arg) +{ + pte_val(*pte) &= ~_PAGE_NO_CACHE; +} + +static inline void iterate_pte(pmd_t * pmd, unsigned long address, + unsigned long size, pte_iterator_t op, + unsigned long arg) +{ + pte_t *pte; + unsigned long end; + + if (pmd_none(*pmd)) + return; + if (pmd_bad(*pmd)) { + pmd_ERROR(*pmd); + pmd_clear(pmd); + return; + } + pte = pte_offset(pmd, address); + address &= ~PMD_MASK; + end = address + size; + if (end > PMD_SIZE) + end = PMD_SIZE; + do { + op(pte, arg); + address += PAGE_SIZE; + pte++; + } while (address < end); +} + +static inline void iterate_pmd(pgd_t * dir, unsigned long address, + unsigned long size, pte_iterator_t op, + unsigned long arg) +{ + pmd_t *pmd; + unsigned long end; + + if (pgd_none(*dir)) + return; + if (pgd_bad(*dir)) { + pgd_ERROR(*dir); + pgd_clear(dir); + return; + } + pmd = pmd_offset(dir, address); + address &= ~PGDIR_MASK; + end = address + size; + if (end > PGDIR_SIZE) + end = PGDIR_SIZE; + do { + iterate_pte(pmd, address, end - address, op, arg); + address = (address + PMD_SIZE) & PMD_MASK; + pmd++; + } while (address < end); +} + +static void iterate_pages(unsigned long address, unsigned long size, + pte_iterator_t op, unsigned long arg) +{ + pgd_t *dir; + unsigned long end = address + size; + + dir = pgd_offset_k(address); + flush_cache_all(); + do { + iterate_pmd(dir, address, end - address, op, arg); + address = (address + PGDIR_SIZE) & PGDIR_MASK; + dir++; + } while (address && (address < end)); + flush_tlb_all(); +} + +void +kernel_set_cachemode(unsigned long vaddr, unsigned long size, int what) +{ + switch (what) { + case IOMAP_FULL_CACHING: + iterate_pages(vaddr, size, set_cached, 0); + flush_tlb_range(NULL, vaddr, size); + break; + case IOMAP_NOCACHE_SER: + iterate_pages(vaddr, size, set_uncached, 0); + flush_tlb_range(NULL, vaddr, size); + break; + default: + printk(KERN_CRIT + "kernel_set_cachemode mode %d not understood\n", + what); + break; + } +} |