c-r4k.c
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上传日期:2013-04-10
资源大小:33168k
文件大小:36k
- /*
- * 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.
- *
- * r4xx0.c: R4000 processor variant specific MMU/Cache routines.
- *
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle ralf@gnu.org
- *
- * To do:
- *
- * - this code is a overbloated pig
- * - many of the bug workarounds are not efficient at all, but at
- * least they are functional ...
- */
- #include <linux/config.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <asm/bootinfo.h>
- #include <asm/cpu.h>
- #include <asm/bcache.h>
- #include <asm/io.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/system.h>
- #include <asm/mmu_context.h>
- #include <asm/war.h>
- /* Primary cache parameters. */
- static int icache_size, dcache_size; /* Size in bytes */
- static int ic_lsize, dc_lsize; /* LineSize in bytes */
- /* Secondary cache (if present) parameters. */
- static unsigned int scache_size, sc_lsize; /* Again, in bytes */
- #include <asm/cacheops.h>
- #include <asm/r4kcache.h>
- #undef DEBUG_CACHE
- /*
- * Dummy cache handling routines for machines without boardcaches
- */
- static void no_sc_noop(void) {}
- static struct bcache_ops no_sc_ops = {
- (void *)no_sc_noop, (void *)no_sc_noop,
- (void *)no_sc_noop, (void *)no_sc_noop
- };
- struct bcache_ops *bcops = &no_sc_ops;
- /*
- * On processors with QED R4600 style two set assosicative cache
- * this is the bit which selects the way in the cache for the
- * indexed cachops.
- */
- #define icache_waybit (icache_size >> 1)
- #define dcache_waybit (dcache_size >> 1)
- /*
- * If you think for one second that this stuff coming up is a lot
- * of bulky code eating too many kernel cache lines. Think _again_.
- *
- * Consider:
- * 1) Taken branches have a 3 cycle penalty on R4k
- * 2) The branch itself is a real dead cycle on even R4600/R5000.
- * 3) Only one of the following variants of each type is even used by
- * the kernel based upon the cache parameters we detect at boot time.
- *
- * QED.
- */
- static inline void r4k_flush_cache_all_s16d16i16(void)
- {
- blast_dcache16(); blast_icache16(); blast_scache16();
- }
- static inline void r4k_flush_cache_all_s32d16i16(void)
- {
- blast_dcache16(); blast_icache16(); blast_scache32();
- }
- static inline void r4k_flush_cache_all_s64d16i16(void)
- {
- blast_dcache16(); blast_icache16(); blast_scache64();
- }
- static inline void r4k_flush_cache_all_s128d16i16(void)
- {
- blast_dcache16(); blast_icache16(); blast_scache128();
- }
- static inline void r4k_flush_cache_all_s32d32i32(void)
- {
- blast_dcache32(); blast_icache32(); blast_scache32();
- }
- static inline void r4k_flush_cache_all_s64d32i32(void)
- {
- blast_dcache32(); blast_icache32(); blast_scache64();
- }
- static inline void r4k_flush_cache_all_s128d32i32(void)
- {
- blast_dcache32(); blast_icache32(); blast_scache128();
- }
- static inline void r4k_flush_cache_all_d16i16(void)
- {
- blast_dcache16(); blast_icache16();
- }
- static inline void r4k_flush_cache_all_d32i32(void)
- {
- blast_dcache32(); blast_icache32();
- }
- static void
- r4k_flush_cache_range_s16d16i16(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s16d16i16();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while (start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache16_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void
- r4k_flush_cache_range_s32d16i16(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s32d16i16();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache32_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_s64d16i16(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if(vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s64d16i16();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache64_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_s128d16i16(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s128d16i16();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache128_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_s32d32i32(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s32d32i32();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache32_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_s64d32i32(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s64d32i32();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache64_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_s128d32i32(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- struct vm_area_struct *vma;
- if (mm->context == 0)
- return;
- start &= PAGE_MASK;
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- vma = find_vma(mm, start);
- if (vma) {
- if (mm->context != current->active_mm->context) {
- r4k_flush_cache_all_s128d32i32();
- } else {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- while(start < end) {
- pgd = pgd_offset(mm, start);
- pmd = pmd_offset(pgd, start);
- pte = pte_offset(pmd, start);
- if(pte_val(*pte) & _PAGE_VALID)
- blast_scache128_page(start);
- start += PAGE_SIZE;
- }
- }
- }
- }
- static void r4k_flush_cache_range_d16i16(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- blast_dcache16(); blast_icache16();
- }
- }
- static void r4k_flush_cache_range_d32i32(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
- #endif
- blast_dcache32(); blast_icache32();
- }
- }
- /*
- * On architectures like the Sparc, we could get rid of lines in
- * the cache created only by a certain context, but on the MIPS
- * (and actually certain Sparc's) we cannot.
- */
- static void r4k_flush_cache_mm_s16d16i16(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s16d16i16();
- }
- }
- static void r4k_flush_cache_mm_s32d16i16(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s32d16i16();
- }
- }
- static void r4k_flush_cache_mm_s64d16i16(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s64d16i16();
- }
- }
- static void r4k_flush_cache_mm_s128d16i16(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s128d16i16();
- }
- }
- static void r4k_flush_cache_mm_s32d32i32(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s32d32i32();
- }
- }
- static void r4k_flush_cache_mm_s64d32i32(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s64d32i32();
- }
- }
- static void r4k_flush_cache_mm_s128d32i32(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_s128d32i32();
- }
- }
- static void r4k_flush_cache_mm_d16i16(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_d16i16();
- }
- }
- static void r4k_flush_cache_mm_d32i32(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- #ifdef DEBUG_CACHE
- printk("cmm[%d]", (int)mm->context);
- #endif
- r4k_flush_cache_all_d32i32();
- }
- }
- static void r4k_flush_cache_page_s16d16i16(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache16_page_indexed(page);
- blast_scache16_page_indexed(page);
- } else
- blast_scache16_page(page);
- out:
- }
- static void r4k_flush_cache_page_s32d16i16(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /* If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache16_page_indexed(page);
- blast_scache32_page_indexed(page);
- } else
- blast_scache32_page(page);
- out:
- }
- static void r4k_flush_cache_page_s64d16i16(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /* If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache16_page_indexed(page);
- blast_scache64_page_indexed(page);
- } else
- blast_scache64_page(page);
- out:
- }
- static void r4k_flush_cache_page_s128d16i16(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache16_page_indexed(page);
- blast_scache128_page_indexed(page);
- } else
- blast_scache128_page(page);
- out:
- }
- static void r4k_flush_cache_page_s32d32i32(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache32_page_indexed(page);
- blast_scache32_page_indexed(page);
- } else
- blast_scache32_page(page);
- out:
- }
- static void r4k_flush_cache_page_s64d32i32(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache32_page_indexed(page);
- blast_scache64_page_indexed(page);
- } else
- blast_scache64_page(page);
- out:
- }
- static void r4k_flush_cache_page_s128d32i32(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm->context != current->active_mm->context) {
- /* Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (scache_size - 1)));
- blast_dcache32_page_indexed(page);
- blast_scache128_page_indexed(page);
- } else
- blast_scache128_page(page);
- out:
- }
- static void r4k_flush_cache_page_d16i16(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_VALID))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if (mm == current->active_mm) {
- blast_dcache16_page(page);
- } else {
- /* Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (dcache_size - 1)));
- blast_dcache16_page_indexed(page);
- }
- out:
- }
- static void r4k_flush_cache_page_d32i32(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_PRESENT))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
- blast_dcache32_page(page);
- } else {
- /*
- * Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (dcache_size - 1)));
- blast_dcache32_page_indexed(page);
- }
- out:
- }
- static void r4k_flush_cache_page_d32i32_r4600(struct vm_area_struct *vma,
- unsigned long page)
- {
- struct mm_struct *mm = vma->vm_mm;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- /*
- * If ownes no valid ASID yet, cannot possibly have gotten
- * this page into the cache.
- */
- if (mm->context == 0)
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- page &= PAGE_MASK;
- pgdp = pgd_offset(mm, page);
- pmdp = pmd_offset(pgdp, page);
- ptep = pte_offset(pmdp, page);
- /*
- * If the page isn't marked valid, the page cannot possibly be
- * in the cache.
- */
- if (!(pte_val(*ptep) & _PAGE_PRESENT))
- goto out;
- /*
- * Doing flushes for another ASID than the current one is
- * too difficult since stupid R4k caches do a TLB translation
- * for every cache flush operation. So we do indexed flushes
- * in that case, which doesn't overly flush the cache too much.
- */
- if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
- blast_dcache32_page(page);
- } else {
- /* Do indexed flush, too much work to get the (possible)
- * tlb refills to work correctly.
- */
- page = (KSEG0 + (page & (dcache_size - 1)));
- blast_dcache32_page_indexed(page);
- blast_dcache32_page_indexed(page ^ dcache_waybit);
- }
- out:
- }
- /* If the addresses passed to these routines are valid, they are
- * either:
- *
- * 1) In KSEG0, so we can do a direct flush of the page.
- * 2) In KSEG2, and since every process can translate those
- * addresses all the time in kernel mode we can do a direct
- * flush.
- * 3) In KSEG1, no flush necessary.
- */
- static void r4k_flush_page_to_ram_s16(struct page *page)
- {
- blast_scache16_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_s32(struct page *page)
- {
- blast_scache32_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_s64(struct page *page)
- {
- blast_scache64_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_s128(struct page *page)
- {
- blast_scache128_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_d16(struct page *page)
- {
- blast_dcache16_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_d32(struct page *page)
- {
- blast_dcache32_page((unsigned long)page_address(page));
- }
- static void r4k_flush_page_to_ram_d32_r4600(struct page *page)
- {
- #ifdef R4600_V1_HIT_DCACHE_WAR
- unsigned long flags;
- __save_and_cli(flags);
- __asm__ __volatile__("nop;nop;nop;nop");
- #endif
- blast_dcache32_page((unsigned long)page_address(page));
- #ifdef R4600_V1_HIT_DCACHE_WAR
- __restore_flags(flags);
- #endif
- }
- static void
- r4k_flush_icache_page_s(struct vm_area_struct *vma, struct page *page)
- {
- /*
- * We did an scache flush therefore PI is already clean.
- */
- }
- static void
- r4k_flush_icache_range(unsigned long start, unsigned long end)
- {
- flush_cache_all();
- }
- /*
- * Ok, this seriously sucks. We use them to flush a user page but don't
- * know the virtual address, so we have to blast away the whole icache
- * which is significantly more expensive than the real thing.
- */
- static void
- r4k_flush_icache_page_p(struct vm_area_struct *vma, struct page *page)
- {
- if (!(vma->vm_flags & VM_EXEC))
- return;
- flush_cache_all();
- }
- static void
- r4k_dma_cache_wback_inv_pc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- unsigned int flags;
- if (size >= dcache_size) {
- flush_cache_all();
- } else {
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- /* Workaround for R4600 bug. See comment in <asm/war>. */
- __save_and_cli(flags);
- *(volatile unsigned long *)KSEG1;
- #endif
- a = addr & ~(dc_lsize - 1);
- end = (addr + size) & ~(dc_lsize - 1);
- while (1) {
- flush_dcache_line(a); /* Hit_Writeback_Inv_D */
- if (a == end) break;
- a += dc_lsize;
- }
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- __restore_flags(flags);
- #endif
- }
- bc_wback_inv(addr, size);
- }
- static void
- r4k_dma_cache_wback_inv_sc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- if (size >= scache_size) {
- flush_cache_all();
- return;
- }
- a = addr & ~(sc_lsize - 1);
- end = (addr + size) & ~(sc_lsize - 1);
- while (1) {
- flush_scache_line(a); /* Hit_Writeback_Inv_SD */
- if (a == end) break;
- a += sc_lsize;
- }
- }
- static void
- r4k_dma_cache_inv_pc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- unsigned int flags;
- if (size >= dcache_size) {
- flush_cache_all();
- } else {
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- /* Workaround for R4600 bug. See comment above. */
- __save_and_cli(flags);
- *(volatile unsigned long *)KSEG1;
- #endif
- a = addr & ~(dc_lsize - 1);
- end = (addr + size) & ~(dc_lsize - 1);
- while (1) {
- flush_dcache_line(a); /* Hit_Writeback_Inv_D */
- if (a == end) break;
- a += dc_lsize;
- }
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- __restore_flags(flags);
- #endif
- }
- bc_inv(addr, size);
- }
- static void
- r4k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- if (size >= scache_size) {
- flush_cache_all();
- return;
- }
- a = addr & ~(sc_lsize - 1);
- end = (addr + size) & ~(sc_lsize - 1);
- while (1) {
- flush_scache_line(a); /* Hit_Writeback_Inv_SD */
- if (a == end) break;
- a += sc_lsize;
- }
- }
- /*
- * While we're protected against bad userland addresses we don't care
- * very much about what happens in that case. Usually a segmentation
- * fault will dump the process later on anyway ...
- */
- static void r4k_flush_cache_sigtramp(unsigned long addr)
- {
- #ifdef R4600_V1_HIT_DCACHE_WAR
- unsigned long flags;
- __save_and_cli(flags);
- __asm__ __volatile__("nop;nop;nop;nop");
- #endif
- protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
- protected_flush_icache_line(addr & ~(ic_lsize - 1));
- #ifdef R4600_V1_HIT_DCACHE_WAR
- __restore_flags(flags);
- #endif
- }
- static void r4600v20k_flush_cache_sigtramp(unsigned long addr)
- {
- unsigned int flags;
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- __save_and_cli(flags);
- /* Clear internal cache refill buffer */
- *(volatile unsigned int *)KSEG1;
- #endif
- protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
- protected_flush_icache_line(addr & ~(ic_lsize - 1));
- #ifdef R4600_V2_HIT_CACHEOP_WAR
- __restore_flags(flags);
- #endif
- }
- /* Detect and size the various r4k caches. */
- static void __init probe_icache(unsigned long config)
- {
- switch (mips_cpu.cputype) {
- case CPU_VR41XX:
- case CPU_VR4111:
- case CPU_VR4121:
- case CPU_VR4122:
- case CPU_VR4131:
- case CPU_VR4181:
- case CPU_VR4181A:
- icache_size = 1 << (10 + ((config >> 9) & 7));
- break;
- default:
- icache_size = 1 << (12 + ((config >> 9) & 7));
- break;
- }
- ic_lsize = 16 << ((config >> 5) & 1);
- printk("Primary instruction cache %dkb, linesize %d bytes.n",
- icache_size >> 10, ic_lsize);
- }
- static void __init probe_dcache(unsigned long config)
- {
- switch (mips_cpu.cputype) {
- case CPU_VR41XX:
- case CPU_VR4111:
- case CPU_VR4121:
- case CPU_VR4122:
- case CPU_VR4131:
- case CPU_VR4181:
- case CPU_VR4181A:
- dcache_size = 1 << (10 + ((config >> 6) & 7));
- break;
- default:
- dcache_size = 1 << (12 + ((config >> 6) & 7));
- break;
- }
- dc_lsize = 16 << ((config >> 4) & 1);
- printk("Primary data cache %dkb, linesize %d bytes.n",
- dcache_size >> 10, dc_lsize);
- }
- /* If you even _breathe_ on this function, look at the gcc output
- * and make sure it does not pop things on and off the stack for
- * the cache sizing loop that executes in KSEG1 space or else
- * you will crash and burn badly. You have been warned.
- */
- static int __init probe_scache(unsigned long config)
- {
- extern unsigned long stext;
- unsigned long flags, addr, begin, end, pow2;
- int tmp;
- tmp = ((config >> 17) & 1);
- if(tmp)
- return 0;
- tmp = ((config >> 22) & 3);
- switch(tmp) {
- case 0:
- sc_lsize = 16;
- break;
- case 1:
- sc_lsize = 32;
- break;
- case 2:
- sc_lsize = 64;
- break;
- case 3:
- sc_lsize = 128;
- break;
- }
- begin = (unsigned long) &stext;
- begin &= ~((4 * 1024 * 1024) - 1);
- end = begin + (4 * 1024 * 1024);
- /* This is such a bitch, you'd think they would make it
- * easy to do this. Away you daemons of stupidity!
- */
- __save_and_cli(flags);
- /* Fill each size-multiple cache line with a valid tag. */
- pow2 = (64 * 1024);
- for(addr = begin; addr < end; addr = (begin + pow2)) {
- unsigned long *p = (unsigned long *) addr;
- __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
- pow2 <<= 1;
- }
- /* Load first line with zero (therefore invalid) tag. */
- set_taglo(0);
- set_taghi(0);
- __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
- __asm__ __volatile__("nt.set noreordernt"
- ".set mips3nt"
- "cache 8, (%0)nt"
- ".set mips0nt"
- ".set reordernt" : : "r" (begin));
- __asm__ __volatile__("nt.set noreordernt"
- ".set mips3nt"
- "cache 9, (%0)nt"
- ".set mips0nt"
- ".set reordernt" : : "r" (begin));
- __asm__ __volatile__("nt.set noreordernt"
- ".set mips3nt"
- "cache 11, (%0)nt"
- ".set mips0nt"
- ".set reordernt" : : "r" (begin));
- /* Now search for the wrap around point. */
- pow2 = (128 * 1024);
- tmp = 0;
- for(addr = (begin + (128 * 1024)); addr < (end); addr = (begin + pow2)) {
- __asm__ __volatile__("nt.set noreordernt"
- ".set mips3nt"
- "cache 7, (%0)nt"
- ".set mips0nt"
- ".set reordernt" : : "r" (addr));
- __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
- if(!get_taglo())
- break;
- pow2 <<= 1;
- }
- __restore_flags(flags);
- addr -= begin;
- printk("Secondary cache sized at %dK linesize %d bytes.n",
- (int) (addr >> 10), sc_lsize);
- scache_size = addr;
- return 1;
- }
- static void __init setup_noscache_funcs(void)
- {
- unsigned int prid;
- switch(dc_lsize) {
- case 16:
- _clear_page = r4k_clear_page_d16;
- _copy_page = r4k_copy_page_d16;
- _flush_cache_all = r4k_flush_cache_all_d16i16;
- _flush_cache_mm = r4k_flush_cache_mm_d16i16;
- _flush_cache_range = r4k_flush_cache_range_d16i16;
- _flush_cache_page = r4k_flush_cache_page_d16i16;
- _flush_page_to_ram = r4k_flush_page_to_ram_d16;
- break;
- case 32:
- prid = read_32bit_cp0_register(CP0_PRID) & 0xfff0;
- if (prid == 0x2010) { /* R4600 V1.7 */
- _clear_page = r4k_clear_page_r4600_v1;
- _copy_page = r4k_copy_page_r4600_v1;
- _flush_page_to_ram = r4k_flush_page_to_ram_d32_r4600;
- } else if (prid == 0x2020) { /* R4600 V2.0 */
- _clear_page = r4k_clear_page_r4600_v2;
- _copy_page = r4k_copy_page_r4600_v2;
- _flush_page_to_ram = r4k_flush_page_to_ram_d32;
- } else {
- _clear_page = r4k_clear_page_d32;
- _copy_page = r4k_copy_page_d32;
- _flush_page_to_ram = r4k_flush_page_to_ram_d32;
- }
- _flush_cache_all = r4k_flush_cache_all_d32i32;
- _flush_cache_mm = r4k_flush_cache_mm_d32i32;
- _flush_cache_range = r4k_flush_cache_range_d32i32;
- _flush_cache_page = r4k_flush_cache_page_d32i32;
- break;
- }
- ___flush_cache_all = _flush_cache_all;
- _flush_icache_page = r4k_flush_icache_page_p;
- _dma_cache_wback_inv = r4k_dma_cache_wback_inv_pc;
- _dma_cache_wback = r4k_dma_cache_wback_inv_pc;
- _dma_cache_inv = r4k_dma_cache_inv_pc;
- }
- static void __init setup_scache_funcs(void)
- {
- switch(sc_lsize) {
- case 16:
- switch(dc_lsize) {
- case 16:
- _flush_cache_all = r4k_flush_cache_all_s16d16i16;
- _flush_cache_mm = r4k_flush_cache_mm_s16d16i16;
- _flush_cache_range = r4k_flush_cache_range_s16d16i16;
- _flush_cache_page = r4k_flush_cache_page_s16d16i16;
- break;
- case 32:
- panic("Invalid cache configuration detected");
- };
- _flush_page_to_ram = r4k_flush_page_to_ram_s16;
- _clear_page = r4k_clear_page_s16;
- _copy_page = r4k_copy_page_s16;
- break;
- case 32:
- switch(dc_lsize) {
- case 16:
- _flush_cache_all = r4k_flush_cache_all_s32d16i16;
- _flush_cache_mm = r4k_flush_cache_mm_s32d16i16;
- _flush_cache_range = r4k_flush_cache_range_s32d16i16;
- _flush_cache_page = r4k_flush_cache_page_s32d16i16;
- break;
- case 32:
- _flush_cache_all = r4k_flush_cache_all_s32d32i32;
- _flush_cache_mm = r4k_flush_cache_mm_s32d32i32;
- _flush_cache_range = r4k_flush_cache_range_s32d32i32;
- _flush_cache_page = r4k_flush_cache_page_s32d32i32;
- break;
- };
- _flush_page_to_ram = r4k_flush_page_to_ram_s32;
- _clear_page = r4k_clear_page_s32;
- _copy_page = r4k_copy_page_s32;
- break;
- case 64:
- switch(dc_lsize) {
- case 16:
- _flush_cache_all = r4k_flush_cache_all_s64d16i16;
- _flush_cache_mm = r4k_flush_cache_mm_s64d16i16;
- _flush_cache_range = r4k_flush_cache_range_s64d16i16;
- _flush_cache_page = r4k_flush_cache_page_s64d16i16;
- break;
- case 32:
- _flush_cache_all = r4k_flush_cache_all_s64d32i32;
- _flush_cache_mm = r4k_flush_cache_mm_s64d32i32;
- _flush_cache_range = r4k_flush_cache_range_s64d32i32;
- _flush_cache_page = r4k_flush_cache_page_s64d32i32;
- break;
- };
- _flush_page_to_ram = r4k_flush_page_to_ram_s64;
- _clear_page = r4k_clear_page_s64;
- _copy_page = r4k_copy_page_s64;
- break;
- case 128:
- switch(dc_lsize) {
- case 16:
- _flush_cache_all = r4k_flush_cache_all_s128d16i16;
- _flush_cache_mm = r4k_flush_cache_mm_s128d16i16;
- _flush_cache_range = r4k_flush_cache_range_s128d16i16;
- _flush_cache_page = r4k_flush_cache_page_s128d16i16;
- break;
- case 32:
- _flush_cache_all = r4k_flush_cache_all_s128d32i32;
- _flush_cache_mm = r4k_flush_cache_mm_s128d32i32;
- _flush_cache_range = r4k_flush_cache_range_s128d32i32;
- _flush_cache_page = r4k_flush_cache_page_s128d32i32;
- break;
- };
- _flush_page_to_ram = r4k_flush_page_to_ram_s128;
- _clear_page = r4k_clear_page_s128;
- _copy_page = r4k_copy_page_s128;
- break;
- }
- ___flush_cache_all = _flush_cache_all;
- _flush_icache_page = r4k_flush_icache_page_s;
- _dma_cache_wback_inv = r4k_dma_cache_wback_inv_sc;
- _dma_cache_wback = r4k_dma_cache_wback_inv_sc;
- _dma_cache_inv = r4k_dma_cache_inv_sc;
- }
- typedef int (*probe_func_t)(unsigned long);
- static inline void __init setup_scache(unsigned int config)
- {
- probe_func_t probe_scache_kseg1;
- int sc_present = 0;
- /* Maybe the cpu knows about a l2 cache? */
- probe_scache_kseg1 = (probe_func_t) (KSEG1ADDR(&probe_scache));
- sc_present = probe_scache_kseg1(config);
- if (!sc_present) {
- setup_noscache_funcs();
- return;
- }
- switch(mips_cpu.cputype) {
- case CPU_R5000:
- case CPU_NEVADA:
- setup_noscache_funcs();
- #if defined(CONFIG_CPU_R5000) || defined(CONFIG_CPU_NEVADA)
- r5k_sc_init();
- #endif
- break;
- default:
- setup_scache_funcs();
- }
- }
- void __init ld_mmu_r4xx0(void)
- {
- unsigned long config = read_32bit_cp0_register(CP0_CONFIG);
- change_cp0_config(CONF_CM_CMASK | CONF_CU, CONF_CM_DEFAULT);
- probe_icache(config);
- probe_dcache(config);
- setup_scache(config);
- switch(mips_cpu.cputype) {
- case CPU_R4600: /* QED style two way caches? */
- case CPU_R4700:
- case CPU_R5000:
- case CPU_NEVADA:
- _flush_cache_page = r4k_flush_cache_page_d32i32_r4600;
- }
- _flush_cache_sigtramp = r4k_flush_cache_sigtramp;
- _flush_icache_range = r4k_flush_icache_range; /* Ouch */
- if ((read_32bit_cp0_register(CP0_PRID) & 0xfff0) == 0x2020) {
- _flush_cache_sigtramp = r4600v20k_flush_cache_sigtramp;
- }
- __flush_cache_all();
- }