37443ef3f0
This paves the way for allowing individual CPUs to overload the individual flushing routines that they care about without having to depend on weak aliases. SH-4 is converted over initially, as it wires up pretty much everything. The majority of the other CPUs will simply use the default no-op implementation with their own region flushers wired up. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
257 lines
7.2 KiB
C
257 lines
7.2 KiB
C
/*
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* arch/sh/mm/pg-mmu.c
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*
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* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
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* Copyright (C) 2002 - 2009 Paul Mundt
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*
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* Released under the terms of the GNU GPL v2.0.
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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void (*flush_cache_all)(void);
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void (*flush_cache_mm)(struct mm_struct *mm);
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void (*flush_cache_dup_mm)(struct mm_struct *mm);
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void (*flush_cache_page)(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn);
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void (*flush_cache_range)(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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void (*flush_dcache_page)(struct page *page);
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void (*flush_icache_range)(unsigned long start, unsigned long end);
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void (*flush_icache_page)(struct vm_area_struct *vma,
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struct page *page);
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void (*flush_cache_sigtramp)(unsigned long address);
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void (*__flush_wback_region)(void *start, int size);
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void (*__flush_purge_region)(void *start, int size);
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void (*__flush_invalidate_region)(void *start, int size);
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static inline void noop_flush_cache_all(void)
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{
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}
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static inline void noop_flush_cache_mm(struct mm_struct *mm)
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{
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}
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static inline void noop_flush_cache_page(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn)
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{
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}
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static inline void noop_flush_cache_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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}
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static inline void noop_flush_dcache_page(struct page *page)
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{
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}
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static inline void noop_flush_icache_range(unsigned long start,
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unsigned long end)
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{
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}
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static inline void noop_flush_icache_page(struct vm_area_struct *vma,
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struct page *page)
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{
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}
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static inline void noop_flush_cache_sigtramp(unsigned long address)
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{
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}
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static inline void noop__flush_region(void *start, int size)
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{
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}
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
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!test_bit(PG_dcache_dirty, &page->flags)) {
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void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(vto, src, len);
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kunmap_coherent();
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} else {
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memcpy(dst, src, len);
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if (boot_cpu_data.dcache.n_aliases)
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set_bit(PG_dcache_dirty, &page->flags);
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}
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if (vma->vm_flags & VM_EXEC)
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flush_cache_page(vma, vaddr, page_to_pfn(page));
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}
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void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
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!test_bit(PG_dcache_dirty, &page->flags)) {
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void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(dst, vfrom, len);
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kunmap_coherent();
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} else {
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memcpy(dst, src, len);
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if (boot_cpu_data.dcache.n_aliases)
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set_bit(PG_dcache_dirty, &page->flags);
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}
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}
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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void *vfrom, *vto;
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vto = kmap_atomic(to, KM_USER1);
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if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
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!test_bit(PG_dcache_dirty, &from->flags)) {
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vfrom = kmap_coherent(from, vaddr);
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copy_page(vto, vfrom);
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kunmap_coherent();
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} else {
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vfrom = kmap_atomic(from, KM_USER0);
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copy_page(vto, vfrom);
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kunmap_atomic(vfrom, KM_USER0);
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}
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if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
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__flush_wback_region(vto, PAGE_SIZE);
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kunmap_atomic(vto, KM_USER1);
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/* Make sure this page is cleared on other CPU's too before using it */
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smp_wmb();
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}
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EXPORT_SYMBOL(copy_user_highpage);
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void clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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void *kaddr = kmap_atomic(page, KM_USER0);
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clear_page(kaddr);
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if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
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__flush_wback_region(kaddr, PAGE_SIZE);
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kunmap_atomic(kaddr, KM_USER0);
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}
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EXPORT_SYMBOL(clear_user_highpage);
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void __update_cache(struct vm_area_struct *vma,
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unsigned long address, pte_t pte)
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{
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struct page *page;
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unsigned long pfn = pte_pfn(pte);
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if (!boot_cpu_data.dcache.n_aliases)
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return;
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page = pfn_to_page(pfn);
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if (pfn_valid(pfn) && page_mapping(page)) {
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int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
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if (dirty) {
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unsigned long addr = (unsigned long)page_address(page);
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if (pages_do_alias(addr, address & PAGE_MASK))
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__flush_wback_region((void *)addr, PAGE_SIZE);
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}
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}
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}
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void __flush_anon_page(struct page *page, unsigned long vmaddr)
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{
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unsigned long addr = (unsigned long) page_address(page);
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if (pages_do_alias(addr, vmaddr)) {
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if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
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!test_bit(PG_dcache_dirty, &page->flags)) {
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void *kaddr;
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kaddr = kmap_coherent(page, vmaddr);
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__flush_wback_region((void *)kaddr, PAGE_SIZE);
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kunmap_coherent();
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} else
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__flush_wback_region((void *)addr, PAGE_SIZE);
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}
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}
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static void compute_alias(struct cache_info *c)
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{
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c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
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c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
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}
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static void __init emit_cache_params(void)
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{
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printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
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boot_cpu_data.icache.ways,
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boot_cpu_data.icache.sets,
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boot_cpu_data.icache.way_incr);
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printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
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boot_cpu_data.icache.entry_mask,
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boot_cpu_data.icache.alias_mask,
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boot_cpu_data.icache.n_aliases);
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printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
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boot_cpu_data.dcache.ways,
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boot_cpu_data.dcache.sets,
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boot_cpu_data.dcache.way_incr);
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printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
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boot_cpu_data.dcache.entry_mask,
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boot_cpu_data.dcache.alias_mask,
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boot_cpu_data.dcache.n_aliases);
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/*
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* Emit Secondary Cache parameters if the CPU has a probed L2.
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*/
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if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
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printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
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boot_cpu_data.scache.ways,
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boot_cpu_data.scache.sets,
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boot_cpu_data.scache.way_incr);
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printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
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boot_cpu_data.scache.entry_mask,
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boot_cpu_data.scache.alias_mask,
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boot_cpu_data.scache.n_aliases);
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}
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}
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void __init cpu_cache_init(void)
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{
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compute_alias(&boot_cpu_data.icache);
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compute_alias(&boot_cpu_data.dcache);
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compute_alias(&boot_cpu_data.scache);
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flush_cache_all = noop_flush_cache_all;
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flush_cache_mm = noop_flush_cache_mm;
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flush_cache_dup_mm = noop_flush_cache_mm;
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flush_cache_page = noop_flush_cache_page;
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flush_cache_range = noop_flush_cache_range;
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flush_dcache_page = noop_flush_dcache_page;
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flush_icache_range = noop_flush_icache_range;
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flush_icache_page = noop_flush_icache_page;
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flush_cache_sigtramp = noop_flush_cache_sigtramp;
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__flush_wback_region = noop__flush_region;
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__flush_purge_region = noop__flush_region;
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__flush_invalidate_region = noop__flush_region;
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if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
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(boot_cpu_data.family == CPU_FAMILY_SH4A) ||
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(boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
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extern void __weak sh4_cache_init(void);
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sh4_cache_init();
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}
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emit_cache_params();
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}
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