4 * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
5 * Copyright (C) 2002 - 2009 Paul Mundt
7 * Released under the terms of the GNU GPL v2.0.
10 #include <linux/init.h>
11 #include <linux/mutex.h>
13 #include <linux/smp.h>
14 #include <linux/highmem.h>
15 #include <linux/module.h>
16 #include <asm/mmu_context.h>
17 #include <asm/cacheflush.h>
19 void (*local_flush_cache_all)(void *args) = cache_noop;
20 void (*local_flush_cache_mm)(void *args) = cache_noop;
21 void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
22 void (*local_flush_cache_page)(void *args) = cache_noop;
23 void (*local_flush_cache_range)(void *args) = cache_noop;
24 void (*local_flush_dcache_page)(void *args) = cache_noop;
25 void (*local_flush_icache_range)(void *args) = cache_noop;
26 void (*local_flush_icache_page)(void *args) = cache_noop;
27 void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
29 void (*__flush_wback_region)(void *start, int size);
30 EXPORT_SYMBOL(__flush_wback_region);
31 void (*__flush_purge_region)(void *start, int size);
32 EXPORT_SYMBOL(__flush_purge_region);
33 void (*__flush_invalidate_region)(void *start, int size);
34 EXPORT_SYMBOL(__flush_invalidate_region);
36 static inline void noop__flush_region(void *start, int size)
40 static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
44 smp_call_function(func, info, wait);
49 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
50 unsigned long vaddr, void *dst, const void *src,
53 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
54 !test_bit(PG_dcache_dirty, &page->flags)) {
55 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
56 memcpy(vto, src, len);
59 memcpy(dst, src, len);
60 if (boot_cpu_data.dcache.n_aliases)
61 set_bit(PG_dcache_dirty, &page->flags);
64 if (vma->vm_flags & VM_EXEC)
65 flush_cache_page(vma, vaddr, page_to_pfn(page));
68 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
69 unsigned long vaddr, void *dst, const void *src,
72 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
73 !test_bit(PG_dcache_dirty, &page->flags)) {
74 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
75 memcpy(dst, vfrom, len);
76 kunmap_coherent(vfrom);
78 memcpy(dst, src, len);
79 if (boot_cpu_data.dcache.n_aliases)
80 set_bit(PG_dcache_dirty, &page->flags);
84 void copy_user_highpage(struct page *to, struct page *from,
85 unsigned long vaddr, struct vm_area_struct *vma)
89 vto = kmap_atomic(to, KM_USER1);
91 if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
92 !test_bit(PG_dcache_dirty, &from->flags)) {
93 vfrom = kmap_coherent(from, vaddr);
94 copy_page(vto, vfrom);
95 kunmap_coherent(vfrom);
97 vfrom = kmap_atomic(from, KM_USER0);
98 copy_page(vto, vfrom);
99 kunmap_atomic(vfrom, KM_USER0);
102 if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
103 __flush_purge_region(vto, PAGE_SIZE);
105 kunmap_atomic(vto, KM_USER1);
106 /* Make sure this page is cleared on other CPU's too before using it */
109 EXPORT_SYMBOL(copy_user_highpage);
111 void clear_user_highpage(struct page *page, unsigned long vaddr)
113 void *kaddr = kmap_atomic(page, KM_USER0);
117 if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
118 __flush_purge_region(kaddr, PAGE_SIZE);
120 kunmap_atomic(kaddr, KM_USER0);
122 EXPORT_SYMBOL(clear_user_highpage);
124 void __update_cache(struct vm_area_struct *vma,
125 unsigned long address, pte_t pte)
128 unsigned long pfn = pte_pfn(pte);
130 if (!boot_cpu_data.dcache.n_aliases)
133 page = pfn_to_page(pfn);
134 if (pfn_valid(pfn)) {
135 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
137 unsigned long addr = (unsigned long)page_address(page);
139 if (pages_do_alias(addr, address & PAGE_MASK))
140 __flush_purge_region((void *)addr, PAGE_SIZE);
145 void __flush_anon_page(struct page *page, unsigned long vmaddr)
147 unsigned long addr = (unsigned long) page_address(page);
149 if (pages_do_alias(addr, vmaddr)) {
150 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
151 !test_bit(PG_dcache_dirty, &page->flags)) {
154 kaddr = kmap_coherent(page, vmaddr);
155 /* XXX.. For now kunmap_coherent() does a purge */
156 /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
157 kunmap_coherent(kaddr);
159 __flush_purge_region((void *)addr, PAGE_SIZE);
163 void flush_cache_all(void)
165 cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
167 EXPORT_SYMBOL(flush_cache_all);
169 void flush_cache_mm(struct mm_struct *mm)
171 if (boot_cpu_data.dcache.n_aliases == 0)
174 cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
177 void flush_cache_dup_mm(struct mm_struct *mm)
179 if (boot_cpu_data.dcache.n_aliases == 0)
182 cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
185 void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
188 struct flusher_data data;
194 cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1);
197 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
200 struct flusher_data data;
206 cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1);
208 EXPORT_SYMBOL(flush_cache_range);
210 void flush_dcache_page(struct page *page)
212 cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
214 EXPORT_SYMBOL(flush_dcache_page);
216 void flush_icache_range(unsigned long start, unsigned long end)
218 struct flusher_data data;
224 cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1);
227 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
229 /* Nothing uses the VMA, so just pass the struct page along */
230 cacheop_on_each_cpu(local_flush_icache_page, page, 1);
233 void flush_cache_sigtramp(unsigned long address)
235 cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
238 static void compute_alias(struct cache_info *c)
240 c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
241 c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
244 static void __init emit_cache_params(void)
246 printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
247 boot_cpu_data.icache.ways,
248 boot_cpu_data.icache.sets,
249 boot_cpu_data.icache.way_incr);
250 printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
251 boot_cpu_data.icache.entry_mask,
252 boot_cpu_data.icache.alias_mask,
253 boot_cpu_data.icache.n_aliases);
254 printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
255 boot_cpu_data.dcache.ways,
256 boot_cpu_data.dcache.sets,
257 boot_cpu_data.dcache.way_incr);
258 printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
259 boot_cpu_data.dcache.entry_mask,
260 boot_cpu_data.dcache.alias_mask,
261 boot_cpu_data.dcache.n_aliases);
264 * Emit Secondary Cache parameters if the CPU has a probed L2.
266 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
267 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
268 boot_cpu_data.scache.ways,
269 boot_cpu_data.scache.sets,
270 boot_cpu_data.scache.way_incr);
271 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
272 boot_cpu_data.scache.entry_mask,
273 boot_cpu_data.scache.alias_mask,
274 boot_cpu_data.scache.n_aliases);
278 void __init cpu_cache_init(void)
280 unsigned int cache_disabled = 0;
283 cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE);
286 compute_alias(&boot_cpu_data.icache);
287 compute_alias(&boot_cpu_data.dcache);
288 compute_alias(&boot_cpu_data.scache);
290 __flush_wback_region = noop__flush_region;
291 __flush_purge_region = noop__flush_region;
292 __flush_invalidate_region = noop__flush_region;
295 * No flushing is necessary in the disabled cache case so we can
296 * just keep the noop functions in local_flush_..() and __flush_..()
298 if (unlikely(cache_disabled))
301 if (boot_cpu_data.family == CPU_FAMILY_SH2) {
302 extern void __weak sh2_cache_init(void);
307 if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
308 extern void __weak sh2a_cache_init(void);
313 if (boot_cpu_data.family == CPU_FAMILY_SH3) {
314 extern void __weak sh3_cache_init(void);
318 if ((boot_cpu_data.type == CPU_SH7705) &&
319 (boot_cpu_data.dcache.sets == 512)) {
320 extern void __weak sh7705_cache_init(void);
326 if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
327 (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
328 (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
329 extern void __weak sh4_cache_init(void);
334 if (boot_cpu_data.family == CPU_FAMILY_SH5) {
335 extern void __weak sh5_cache_init(void);