| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org) |
| * Copyright (C) 2007 MIPS Technologies, Inc. |
| */ |
| #include <linux/fs.h> |
| #include <linux/fcntl.h> |
| #include <linux/kernel.h> |
| #include <linux/linkage.h> |
| #include <linux/export.h> |
| #include <linux/sched.h> |
| #include <linux/syscalls.h> |
| #include <linux/mm.h> |
| |
| #include <asm/cacheflush.h> |
| #include <asm/highmem.h> |
| #include <asm/processor.h> |
| #include <asm/cpu.h> |
| #include <asm/cpu-features.h> |
| #include <asm/setup.h> |
| |
| /* Cache operations. */ |
| void (*flush_cache_all)(void); |
| void (*__flush_cache_all)(void); |
| EXPORT_SYMBOL_GPL(__flush_cache_all); |
| void (*flush_cache_mm)(struct mm_struct *mm); |
| void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end); |
| void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, |
| unsigned long pfn); |
| void (*flush_icache_range)(unsigned long start, unsigned long end); |
| EXPORT_SYMBOL_GPL(flush_icache_range); |
| void (*local_flush_icache_range)(unsigned long start, unsigned long end); |
| EXPORT_SYMBOL_GPL(local_flush_icache_range); |
| void (*__flush_icache_user_range)(unsigned long start, unsigned long end); |
| EXPORT_SYMBOL_GPL(__flush_icache_user_range); |
| void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end); |
| EXPORT_SYMBOL_GPL(__local_flush_icache_user_range); |
| |
| void (*__flush_cache_vmap)(void); |
| void (*__flush_cache_vunmap)(void); |
| |
| void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); |
| EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); |
| |
| /* MIPS specific cache operations */ |
| void (*flush_cache_sigtramp)(unsigned long addr); |
| void (*local_flush_data_cache_page)(void * addr); |
| void (*flush_data_cache_page)(unsigned long addr); |
| void (*flush_icache_all)(void); |
| |
| EXPORT_SYMBOL_GPL(local_flush_data_cache_page); |
| EXPORT_SYMBOL(flush_data_cache_page); |
| EXPORT_SYMBOL(flush_icache_all); |
| |
| #ifdef CONFIG_DMA_NONCOHERENT |
| |
| /* DMA cache operations. */ |
| void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); |
| void (*_dma_cache_wback)(unsigned long start, unsigned long size); |
| void (*_dma_cache_inv)(unsigned long start, unsigned long size); |
| |
| EXPORT_SYMBOL(_dma_cache_wback_inv); |
| |
| #endif /* CONFIG_DMA_NONCOHERENT */ |
| |
| /* |
| * We could optimize the case where the cache argument is not BCACHE but |
| * that seems very atypical use ... |
| */ |
| SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, |
| unsigned int, cache) |
| { |
| if (bytes == 0) |
| return 0; |
| if (!access_ok((void __user *) addr, bytes)) |
| return -EFAULT; |
| |
| __flush_icache_user_range(addr, addr + bytes); |
| |
| return 0; |
| } |
| |
| void __flush_dcache_page(struct page *page) |
| { |
| struct address_space *mapping = page_mapping_file(page); |
| unsigned long addr; |
| |
| if (mapping && !mapping_mapped(mapping)) { |
| SetPageDcacheDirty(page); |
| return; |
| } |
| |
| /* |
| * We could delay the flush for the !page_mapping case too. But that |
| * case is for exec env/arg pages and those are %99 certainly going to |
| * get faulted into the tlb (and thus flushed) anyways. |
| */ |
| if (PageHighMem(page)) |
| addr = (unsigned long)kmap_atomic(page); |
| else |
| addr = (unsigned long)page_address(page); |
| |
| flush_data_cache_page(addr); |
| |
| if (PageHighMem(page)) |
| __kunmap_atomic((void *)addr); |
| } |
| |
| EXPORT_SYMBOL(__flush_dcache_page); |
| |
| void __flush_anon_page(struct page *page, unsigned long vmaddr) |
| { |
| unsigned long addr = (unsigned long) page_address(page); |
| |
| if (pages_do_alias(addr, vmaddr)) { |
| if (page_mapcount(page) && !Page_dcache_dirty(page)) { |
| void *kaddr; |
| |
| kaddr = kmap_coherent(page, vmaddr); |
| flush_data_cache_page((unsigned long)kaddr); |
| kunmap_coherent(); |
| } else |
| flush_data_cache_page(addr); |
| } |
| } |
| |
| EXPORT_SYMBOL(__flush_anon_page); |
| |
| void __update_cache(unsigned long address, pte_t pte) |
| { |
| struct page *page; |
| unsigned long pfn, addr; |
| int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc; |
| |
| pfn = pte_pfn(pte); |
| if (unlikely(!pfn_valid(pfn))) |
| return; |
| page = pfn_to_page(pfn); |
| if (Page_dcache_dirty(page)) { |
| if (PageHighMem(page)) |
| addr = (unsigned long)kmap_atomic(page); |
| else |
| addr = (unsigned long)page_address(page); |
| |
| if (exec || pages_do_alias(addr, address & PAGE_MASK)) |
| flush_data_cache_page(addr); |
| |
| if (PageHighMem(page)) |
| __kunmap_atomic((void *)addr); |
| |
| ClearPageDcacheDirty(page); |
| } |
| } |
| |
| unsigned long _page_cachable_default; |
| EXPORT_SYMBOL(_page_cachable_default); |
| |
| static inline void setup_protection_map(void) |
| { |
| if (cpu_has_rixi) { |
| protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); |
| protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); |
| protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); |
| protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); |
| protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| |
| protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); |
| protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); |
| protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); |
| protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); |
| protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); |
| protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); |
| protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); |
| |
| } else { |
| protection_map[0] = PAGE_NONE; |
| protection_map[1] = PAGE_READONLY; |
| protection_map[2] = PAGE_COPY; |
| protection_map[3] = PAGE_COPY; |
| protection_map[4] = PAGE_READONLY; |
| protection_map[5] = PAGE_READONLY; |
| protection_map[6] = PAGE_COPY; |
| protection_map[7] = PAGE_COPY; |
| protection_map[8] = PAGE_NONE; |
| protection_map[9] = PAGE_READONLY; |
| protection_map[10] = PAGE_SHARED; |
| protection_map[11] = PAGE_SHARED; |
| protection_map[12] = PAGE_READONLY; |
| protection_map[13] = PAGE_READONLY; |
| protection_map[14] = PAGE_SHARED; |
| protection_map[15] = PAGE_SHARED; |
| } |
| } |
| |
| void cpu_cache_init(void) |
| { |
| if (cpu_has_3k_cache) { |
| extern void __weak r3k_cache_init(void); |
| |
| r3k_cache_init(); |
| } |
| if (cpu_has_6k_cache) { |
| extern void __weak r6k_cache_init(void); |
| |
| r6k_cache_init(); |
| } |
| if (cpu_has_4k_cache) { |
| extern void __weak r4k_cache_init(void); |
| |
| r4k_cache_init(); |
| } |
| if (cpu_has_8k_cache) { |
| extern void __weak r8k_cache_init(void); |
| |
| r8k_cache_init(); |
| } |
| if (cpu_has_tx39_cache) { |
| extern void __weak tx39_cache_init(void); |
| |
| tx39_cache_init(); |
| } |
| |
| if (cpu_has_octeon_cache) { |
| extern void __weak octeon_cache_init(void); |
| |
| octeon_cache_init(); |
| } |
| |
| setup_protection_map(); |
| } |
| |
| int __weak __uncached_access(struct file *file, unsigned long addr) |
| { |
| if (file->f_flags & O_DSYNC) |
| return 1; |
| |
| return addr >= __pa(high_memory); |
| } |