diff options
Diffstat (limited to 'include/asm-parisc/cacheflush.h')
| -rw-r--r-- | include/asm-parisc/cacheflush.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/include/asm-parisc/cacheflush.h b/include/asm-parisc/cacheflush.h new file mode 100644 index 0000000..0673271 --- /dev/null +++ b/include/asm-parisc/cacheflush.h @@ -0,0 +1,182 @@ +#ifndef _PARISC_CACHEFLUSH_H +#define _PARISC_CACHEFLUSH_H + +#include <linux/config.h> +#include <linux/mm.h> + +/* The usual comment is "Caches aren't brain-dead on the <architecture>". + * Unfortunately, that doesn't apply to PA-RISC. */ + +/* Cache flush operations */ + +#ifdef CONFIG_SMP +#define flush_cache_mm(mm) flush_cache_all() +#else +#define flush_cache_mm(mm) flush_cache_all_local() +#endif + +#define flush_kernel_dcache_range(start,size) \ + flush_kernel_dcache_range_asm((start), (start)+(size)); + +extern void flush_cache_all_local(void); + +static inline void cacheflush_h_tmp_function(void *dummy) +{ + flush_cache_all_local(); +} + +static inline void flush_cache_all(void) +{ + on_each_cpu(cacheflush_h_tmp_function, NULL, 1, 1); +} + +#define flush_cache_vmap(start, end) flush_cache_all() +#define flush_cache_vunmap(start, end) flush_cache_all() + +extern int parisc_cache_flush_threshold; +void parisc_setup_cache_timing(void); + +static inline void +flush_user_dcache_range(unsigned long start, unsigned long end) +{ + if ((end - start) < parisc_cache_flush_threshold) + flush_user_dcache_range_asm(start,end); + else + flush_data_cache(); +} + +static inline void +flush_user_icache_range(unsigned long start, unsigned long end) +{ + if ((end - start) < parisc_cache_flush_threshold) + flush_user_icache_range_asm(start,end); + else + flush_instruction_cache(); +} + +extern void flush_dcache_page(struct page *page); + +#define flush_dcache_mmap_lock(mapping) \ + write_lock_irq(&(mapping)->tree_lock) +#define flush_dcache_mmap_unlock(mapping) \ + write_unlock_irq(&(mapping)->tree_lock) + +#define flush_icache_page(vma,page) do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0) + +#define flush_icache_range(s,e) do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0) + +#define copy_to_user_page(vma, page, vaddr, dst, src, len) \ +do { \ + flush_cache_page(vma, vaddr, page_to_pfn(page)); \ + memcpy(dst, src, len); \ + flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \ +} while (0) + +#define copy_from_user_page(vma, page, vaddr, dst, src, len) \ +do { \ + flush_cache_page(vma, vaddr, page_to_pfn(page)); \ + memcpy(dst, src, len); \ +} while (0) + +static inline void flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + int sr3; + + if (!vma->vm_mm->context) { + BUG(); + return; + } + + sr3 = mfsp(3); + if (vma->vm_mm->context == sr3) { + flush_user_dcache_range(start,end); + flush_user_icache_range(start,end); + } else { + flush_cache_all(); + } +} + +/* Simple function to work out if we have an existing address translation + * for a user space vma. */ +static inline pte_t *__translation_exists(struct mm_struct *mm, + unsigned long addr) +{ + pgd_t *pgd = pgd_offset(mm, addr); + pmd_t *pmd; + pte_t *pte; + + if(pgd_none(*pgd)) + return NULL; + + pmd = pmd_offset(pgd, addr); + if(pmd_none(*pmd) || pmd_bad(*pmd)) + return NULL; + + pte = pte_offset_map(pmd, addr); + + /* The PA flush mappings show up as pte_none, but they're + * valid none the less */ + if(pte_none(*pte) && ((pte_val(*pte) & _PAGE_FLUSH) == 0)) + return NULL; + return pte; +} +#define translation_exists(vma, addr) __translation_exists((vma)->vm_mm, addr) + + +/* Private function to flush a page from the cache of a non-current + * process. cr25 contains the Page Directory of the current user + * process; we're going to hijack both it and the user space %sr3 to + * temporarily make the non-current process current. We have to do + * this because cache flushing may cause a non-access tlb miss which + * the handlers have to fill in from the pgd of the non-current + * process. */ +static inline void +flush_user_cache_page_non_current(struct vm_area_struct *vma, + unsigned long vmaddr) +{ + /* save the current process space and pgd */ + unsigned long space = mfsp(3), pgd = mfctl(25); + + /* we don't mind taking interrups since they may not + * do anything with user space, but we can't + * be preempted here */ + preempt_disable(); + + /* make us current */ + mtctl(__pa(vma->vm_mm->pgd), 25); + mtsp(vma->vm_mm->context, 3); + + flush_user_dcache_page(vmaddr); + if(vma->vm_flags & VM_EXEC) + flush_user_icache_page(vmaddr); + + /* put the old current process back */ + mtsp(space, 3); + mtctl(pgd, 25); + preempt_enable(); +} + +static inline void +__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr) +{ + if (likely(vma->vm_mm->context == mfsp(3))) { + flush_user_dcache_page(vmaddr); + if (vma->vm_flags & VM_EXEC) + flush_user_icache_page(vmaddr); + } else { + flush_user_cache_page_non_current(vma, vmaddr); + } +} + +static inline void +flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn) +{ + BUG_ON(!vma->vm_mm->context); + + if(likely(translation_exists(vma, vmaddr))) + __flush_cache_page(vma, vmaddr); + +} +#endif + |
