| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 Cache flushing routines |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/mman.h> |
| 14 | #include <linux/threads.h> |
| 15 | #include <asm/page.h> |
| 16 | #include <asm/pgtable.h> |
| 17 | #include <asm/processor.h> |
| 18 | #include <asm/cacheflush.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | |
| 22 | EXPORT_SYMBOL(mn10300_icache_inv); |
| 23 | EXPORT_SYMBOL(mn10300_dcache_inv); |
| 24 | EXPORT_SYMBOL(mn10300_dcache_inv_range); |
| 25 | EXPORT_SYMBOL(mn10300_dcache_inv_range2); |
| 26 | EXPORT_SYMBOL(mn10300_dcache_inv_page); |
| 27 | |
| 28 | #ifdef CONFIG_MN10300_CACHE_WBACK |
| 29 | EXPORT_SYMBOL(mn10300_dcache_flush); |
| 30 | EXPORT_SYMBOL(mn10300_dcache_flush_inv); |
| 31 | EXPORT_SYMBOL(mn10300_dcache_flush_inv_range); |
| 32 | EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2); |
| 33 | EXPORT_SYMBOL(mn10300_dcache_flush_inv_page); |
| 34 | EXPORT_SYMBOL(mn10300_dcache_flush_range); |
| 35 | EXPORT_SYMBOL(mn10300_dcache_flush_range2); |
| 36 | EXPORT_SYMBOL(mn10300_dcache_flush_page); |
| 37 | #endif |
| 38 | |
| 39 | /* |
| 40 | * write a page back from the dcache and invalidate the icache so that we can |
| 41 | * run code from it that we've just written into it |
| 42 | */ |
| 43 | void flush_icache_page(struct vm_area_struct *vma, struct page *page) |
| 44 | { |
| 45 | mn10300_dcache_flush_page(page_to_phys(page)); |
| 46 | mn10300_icache_inv(); |
| 47 | } |
| 48 | EXPORT_SYMBOL(flush_icache_page); |
| 49 | |
| 50 | /* |
| 51 | * write some code we've just written back from the dcache and invalidate the |
| 52 | * icache so that we can run that code |
| 53 | */ |
| 54 | void flush_icache_range(unsigned long start, unsigned long end) |
| 55 | { |
| 56 | #ifdef CONFIG_MN10300_CACHE_WBACK |
| 57 | unsigned long addr, size, off; |
| 58 | struct page *page; |
| 59 | pgd_t *pgd; |
| 60 | pud_t *pud; |
| 61 | pmd_t *pmd; |
| 62 | pte_t *ppte, pte; |
| 63 | |
| 64 | for (; start < end; start += size) { |
| 65 | /* work out how much of the page to flush */ |
| 66 | off = start & (PAGE_SIZE - 1); |
| 67 | |
| 68 | size = end - start; |
| 69 | if (size > PAGE_SIZE - off) |
| 70 | size = PAGE_SIZE - off; |
| 71 | |
| 72 | /* get the physical address the page is mapped to from the page |
| 73 | * tables */ |
| 74 | pgd = pgd_offset(current->mm, start); |
| 75 | if (!pgd || !pgd_val(*pgd)) |
| 76 | continue; |
| 77 | |
| 78 | pud = pud_offset(pgd, start); |
| 79 | if (!pud || !pud_val(*pud)) |
| 80 | continue; |
| 81 | |
| 82 | pmd = pmd_offset(pud, start); |
| 83 | if (!pmd || !pmd_val(*pmd)) |
| 84 | continue; |
| 85 | |
| 86 | ppte = pte_offset_map(pmd, start); |
| 87 | if (!ppte) |
| 88 | continue; |
| 89 | pte = *ppte; |
| 90 | pte_unmap(ppte); |
| 91 | |
| 92 | if (pte_none(pte)) |
| 93 | continue; |
| 94 | |
| 95 | page = pte_page(pte); |
| 96 | if (!page) |
| 97 | continue; |
| 98 | |
| 99 | addr = page_to_phys(page); |
| 100 | |
| 101 | /* flush the dcache and invalidate the icache coverage on that |
| 102 | * region */ |
| 103 | mn10300_dcache_flush_range2(addr + off, size); |
| 104 | } |
| 105 | #endif |
| 106 | |
| 107 | mn10300_icache_inv(); |
| 108 | } |
| 109 | EXPORT_SYMBOL(flush_icache_range); |
| 110 | |
| 111 | /* |
| 112 | * allow userspace to flush the instruction cache |
| 113 | */ |
| 114 | asmlinkage long sys_cacheflush(unsigned long start, unsigned long end) |
| 115 | { |
| 116 | if (end < start) |
| 117 | return -EINVAL; |
| 118 | |
| 119 | flush_icache_range(start, end); |
| 120 | return 0; |
| 121 | } |