X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Favr32%2Fmm%2Ftlb.c;h=06677be98ffba5fcb0143dac626bf96235fd1e16;hb=82638844d9a8581bbf33201cc209a14876eca167;hp=cd12edbea9f26c403bdc5a3c85f034e76766fc9a;hpb=38e80121bd7d0c493072442ac7eddcba165a07a8;p=pandora-kernel.git diff --git a/arch/avr32/mm/tlb.c b/arch/avr32/mm/tlb.c index cd12edbea9f2..06677be98ffb 100644 --- a/arch/avr32/mm/tlb.c +++ b/arch/avr32/mm/tlb.c @@ -11,21 +11,21 @@ #include -#define _TLBEHI_I 0x100 +/* TODO: Get the correct number from the CONFIG1 system register */ +#define NR_TLB_ENTRIES 32 -void show_dtlb_entry(unsigned int index) +static void show_dtlb_entry(unsigned int index) { - unsigned int tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save; + u32 tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save; unsigned long flags; local_irq_save(flags); mmucr_save = sysreg_read(MMUCR); tlbehi_save = sysreg_read(TLBEHI); - mmucr = mmucr_save & 0x13; - mmucr |= index << 14; + mmucr = SYSREG_BFINS(DRP, index, mmucr_save); sysreg_write(MMUCR, mmucr); - asm volatile("tlbr" : : : "memory"); + __builtin_tlbr(); cpu_sync_pipeline(); tlbehi = sysreg_read(TLBEHI); @@ -33,15 +33,17 @@ void show_dtlb_entry(unsigned int index) printk("%2u: %c %c %02x %05x %05x %o %o %c %c %c %c\n", index, - (tlbehi & 0x200)?'1':'0', - (tlbelo & 0x100)?'1':'0', - (tlbehi & 0xff), - (tlbehi >> 12), (tlbelo >> 12), - (tlbelo >> 4) & 7, (tlbelo >> 2) & 3, - (tlbelo & 0x200)?'1':'0', - (tlbelo & 0x080)?'1':'0', - (tlbelo & 0x001)?'1':'0', - (tlbelo & 0x002)?'1':'0'); + SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0', + SYSREG_BFEXT(G, tlbelo) ? '1' : '0', + SYSREG_BFEXT(ASID, tlbehi), + SYSREG_BFEXT(VPN, tlbehi) >> 2, + SYSREG_BFEXT(PFN, tlbelo) >> 2, + SYSREG_BFEXT(AP, tlbelo), + SYSREG_BFEXT(SZ, tlbelo), + SYSREG_BFEXT(TLBELO_C, tlbelo) ? 'C' : ' ', + SYSREG_BFEXT(B, tlbelo) ? 'B' : ' ', + SYSREG_BFEXT(W, tlbelo) ? 'W' : ' ', + SYSREG_BFEXT(TLBELO_D, tlbelo) ? 'D' : ' '); sysreg_write(MMUCR, mmucr_save); sysreg_write(TLBEHI, tlbehi_save); @@ -54,29 +56,33 @@ void dump_dtlb(void) unsigned int i; printk("ID V G ASID VPN PFN AP SZ C B W D\n"); - for (i = 0; i < 32; i++) + for (i = 0; i < NR_TLB_ENTRIES; i++) show_dtlb_entry(i); } -static unsigned long last_mmucr; - -static inline void set_replacement_pointer(unsigned shift) +static void update_dtlb(unsigned long address, pte_t pte) { - unsigned long mmucr, mmucr_save; + u32 tlbehi; + u32 mmucr; - mmucr = mmucr_save = sysreg_read(MMUCR); + /* + * We're not changing the ASID here, so no need to flush the + * pipeline. + */ + tlbehi = sysreg_read(TLBEHI); + tlbehi = SYSREG_BF(ASID, SYSREG_BFEXT(ASID, tlbehi)); + tlbehi |= address & MMU_VPN_MASK; + tlbehi |= SYSREG_BIT(TLBEHI_V); + sysreg_write(TLBEHI, tlbehi); /* Does this mapping already exist? */ - __asm__ __volatile__( - " tlbs\n" - " mfsr %0, %1" - : "=r"(mmucr) - : "i"(SYSREG_MMUCR)); + __builtin_tlbs(); + mmucr = sysreg_read(MMUCR); if (mmucr & SYSREG_BIT(MMUCR_N)) { /* Not found -- pick a not-recently-accessed entry */ - unsigned long rp; - unsigned long tlbar = sysreg_read(TLBARLO); + unsigned int rp; + u32 tlbar = sysreg_read(TLBARLO); rp = 32 - fls(tlbar); if (rp == 32) { @@ -84,30 +90,14 @@ static inline void set_replacement_pointer(unsigned shift) sysreg_write(TLBARLO, -1L); } - mmucr &= 0x13; - mmucr |= (rp << shift); - + mmucr = SYSREG_BFINS(DRP, rp, mmucr); sysreg_write(MMUCR, mmucr); } - last_mmucr = mmucr; -} - -static void update_dtlb(unsigned long address, pte_t pte, unsigned long asid) -{ - unsigned long vpn; - - vpn = (address & MMU_VPN_MASK) | _TLBEHI_VALID | asid; - sysreg_write(TLBEHI, vpn); - cpu_sync_pipeline(); - - set_replacement_pointer(14); - sysreg_write(TLBELO, pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK); /* Let's go */ - asm volatile("nop\n\ttlbw" : : : "memory"); - cpu_sync_pipeline(); + __builtin_tlbw(); } void update_mmu_cache(struct vm_area_struct *vma, @@ -120,39 +110,40 @@ void update_mmu_cache(struct vm_area_struct *vma, return; local_irq_save(flags); - update_dtlb(address, pte, get_asid()); + update_dtlb(address, pte); local_irq_restore(flags); } -void __flush_tlb_page(unsigned long asid, unsigned long page) +static void __flush_tlb_page(unsigned long asid, unsigned long page) { - unsigned long mmucr, tlbehi; + u32 mmucr, tlbehi; - page |= asid; - sysreg_write(TLBEHI, page); - cpu_sync_pipeline(); - asm volatile("tlbs"); + /* + * Caller is responsible for masking out non-PFN bits in page + * and changing the current ASID if necessary. This means that + * we don't need to flush the pipeline after writing TLBEHI. + */ + tlbehi = page | asid; + sysreg_write(TLBEHI, tlbehi); + + __builtin_tlbs(); mmucr = sysreg_read(MMUCR); if (!(mmucr & SYSREG_BIT(MMUCR_N))) { - unsigned long tlbarlo; - unsigned long entry; + unsigned int entry; + u32 tlbarlo; /* Clear the "valid" bit */ - tlbehi = sysreg_read(TLBEHI); - tlbehi &= ~_TLBEHI_VALID; sysreg_write(TLBEHI, tlbehi); - cpu_sync_pipeline(); /* mark the entry as "not accessed" */ - entry = (mmucr >> 14) & 0x3f; + entry = SYSREG_BFEXT(DRP, mmucr); tlbarlo = sysreg_read(TLBARLO); - tlbarlo |= (0x80000000 >> entry); + tlbarlo |= (0x80000000UL >> entry); sysreg_write(TLBARLO, tlbarlo); /* update the entry with valid bit clear */ - asm volatile("tlbw"); - cpu_sync_pipeline(); + __builtin_tlbw(); } } @@ -190,17 +181,22 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, local_irq_save(flags); size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT; + if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */ mm->context = NO_CONTEXT; if (mm == current->mm) activate_context(mm); } else { - unsigned long asid = mm->context & MMU_CONTEXT_ASID_MASK; - unsigned long saved_asid = MMU_NO_ASID; + unsigned long asid; + unsigned long saved_asid; + + asid = mm->context & MMU_CONTEXT_ASID_MASK; + saved_asid = MMU_NO_ASID; start &= PAGE_MASK; end += (PAGE_SIZE - 1); end &= PAGE_MASK; + if (mm != current->mm) { saved_asid = get_asid(); set_asid(asid); @@ -218,33 +214,34 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, } /* - * TODO: If this is only called for addresses > TASK_SIZE, we can probably - * skip the ASID stuff and just use the Global bit... + * This function depends on the pages to be flushed having the G + * (global) bit set in their pte. This is true for all + * PAGE_KERNEL(_RO) pages. */ void flush_tlb_kernel_range(unsigned long start, unsigned long end) { unsigned long flags; int size; - local_irq_save(flags); size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT; if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */ flush_tlb_all(); } else { - unsigned long asid = init_mm.context & MMU_CONTEXT_ASID_MASK; - unsigned long saved_asid = get_asid(); + unsigned long asid; + + local_irq_save(flags); + asid = get_asid(); start &= PAGE_MASK; end += (PAGE_SIZE - 1); end &= PAGE_MASK; - set_asid(asid); + while (start < end) { __flush_tlb_page(asid, start); start += PAGE_SIZE; } - set_asid(saved_asid); + local_irq_restore(flags); } - local_irq_restore(flags); } void flush_tlb_mm(struct mm_struct *mm) @@ -280,7 +277,7 @@ static void *tlb_start(struct seq_file *tlb, loff_t *pos) { static unsigned long tlb_index; - if (*pos >= 32) + if (*pos >= NR_TLB_ENTRIES) return NULL; tlb_index = 0; @@ -291,7 +288,7 @@ static void *tlb_next(struct seq_file *tlb, void *v, loff_t *pos) { unsigned long *index = v; - if (*index >= 31) + if (*index >= NR_TLB_ENTRIES - 1) return NULL; ++*pos; @@ -313,16 +310,16 @@ static int tlb_show(struct seq_file *tlb, void *v) if (*index == 0) seq_puts(tlb, "ID V G ASID VPN PFN AP SZ C B W D\n"); - BUG_ON(*index >= 32); + BUG_ON(*index >= NR_TLB_ENTRIES); local_irq_save(flags); mmucr_save = sysreg_read(MMUCR); tlbehi_save = sysreg_read(TLBEHI); - mmucr = mmucr_save & 0x13; - mmucr |= *index << 14; + mmucr = SYSREG_BFINS(DRP, *index, mmucr_save); sysreg_write(MMUCR, mmucr); - asm volatile("tlbr" : : : "memory"); + /* TLBR might change the ASID */ + __builtin_tlbr(); cpu_sync_pipeline(); tlbehi = sysreg_read(TLBEHI); @@ -334,16 +331,18 @@ static int tlb_show(struct seq_file *tlb, void *v) local_irq_restore(flags); seq_printf(tlb, "%2lu: %c %c %02x %05x %05x %o %o %c %c %c %c\n", - *index, - (tlbehi & 0x200)?'1':'0', - (tlbelo & 0x100)?'1':'0', - (tlbehi & 0xff), - (tlbehi >> 12), (tlbelo >> 12), - (tlbelo >> 4) & 7, (tlbelo >> 2) & 3, - (tlbelo & 0x200)?'1':'0', - (tlbelo & 0x080)?'1':'0', - (tlbelo & 0x001)?'1':'0', - (tlbelo & 0x002)?'1':'0'); + *index, + SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0', + SYSREG_BFEXT(G, tlbelo) ? '1' : '0', + SYSREG_BFEXT(ASID, tlbehi), + SYSREG_BFEXT(VPN, tlbehi) >> 2, + SYSREG_BFEXT(PFN, tlbelo) >> 2, + SYSREG_BFEXT(AP, tlbelo), + SYSREG_BFEXT(SZ, tlbelo), + SYSREG_BFEXT(TLBELO_C, tlbelo) ? '1' : '0', + SYSREG_BFEXT(B, tlbelo) ? '1' : '0', + SYSREG_BFEXT(W, tlbelo) ? '1' : '0', + SYSREG_BFEXT(TLBELO_D, tlbelo) ? '1' : '0'); return 0; }