summaryrefslogtreecommitdiff
path: root/arch/avr32/mm/tlb.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/avr32/mm/tlb.c')
-rw-r--r--arch/avr32/mm/tlb.c375
1 files changed, 0 insertions, 375 deletions
diff --git a/arch/avr32/mm/tlb.c b/arch/avr32/mm/tlb.c
deleted file mode 100644
index 0da23109f817..000000000000
--- a/arch/avr32/mm/tlb.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * AVR32 TLB operations
- *
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/mm.h>
-
-#include <asm/mmu_context.h>
-
-/* TODO: Get the correct number from the CONFIG1 system register */
-#define NR_TLB_ENTRIES 32
-
-static void show_dtlb_entry(unsigned int index)
-{
- 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 = SYSREG_BFINS(DRP, index, mmucr_save);
- sysreg_write(MMUCR, mmucr);
-
- __builtin_tlbr();
- cpu_sync_pipeline();
-
- tlbehi = sysreg_read(TLBEHI);
- tlbelo = sysreg_read(TLBELO);
-
- printk("%2u: %c %c %02x %05x %05x %o %o %c %c %c %c\n",
- 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) ? '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);
- cpu_sync_pipeline();
- local_irq_restore(flags);
-}
-
-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 < NR_TLB_ENTRIES; i++)
- show_dtlb_entry(i);
-}
-
-static void update_dtlb(unsigned long address, pte_t pte)
-{
- u32 tlbehi;
- u32 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? */
- __builtin_tlbs();
- mmucr = sysreg_read(MMUCR);
-
- if (mmucr & SYSREG_BIT(MMUCR_N)) {
- /* Not found -- pick a not-recently-accessed entry */
- unsigned int rp;
- u32 tlbar = sysreg_read(TLBARLO);
-
- rp = 32 - fls(tlbar);
- if (rp == 32) {
- rp = 0;
- sysreg_write(TLBARLO, -1L);
- }
-
- mmucr = SYSREG_BFINS(DRP, rp, mmucr);
- sysreg_write(MMUCR, mmucr);
- }
-
- sysreg_write(TLBELO, pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK);
-
- /* Let's go */
- __builtin_tlbw();
-}
-
-void update_mmu_cache(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep)
-{
- unsigned long flags;
-
- /* ptrace may call this routine */
- if (vma && current->active_mm != vma->vm_mm)
- return;
-
- local_irq_save(flags);
- update_dtlb(address, *ptep);
- local_irq_restore(flags);
-}
-
-static void __flush_tlb_page(unsigned long asid, unsigned long page)
-{
- u32 mmucr, tlbehi;
-
- /*
- * 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 int entry;
- u32 tlbarlo;
-
- /* Clear the "valid" bit */
- sysreg_write(TLBEHI, tlbehi);
-
- /* mark the entry as "not accessed" */
- entry = SYSREG_BFEXT(DRP, mmucr);
- tlbarlo = sysreg_read(TLBARLO);
- tlbarlo |= (0x80000000UL >> entry);
- sysreg_write(TLBARLO, tlbarlo);
-
- /* update the entry with valid bit clear */
- __builtin_tlbw();
- }
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
- if (vma->vm_mm && vma->vm_mm->context != NO_CONTEXT) {
- unsigned long flags, asid;
- unsigned long saved_asid = MMU_NO_ASID;
-
- asid = vma->vm_mm->context & MMU_CONTEXT_ASID_MASK;
- page &= PAGE_MASK;
-
- local_irq_save(flags);
- if (vma->vm_mm != current->mm) {
- saved_asid = get_asid();
- set_asid(asid);
- }
-
- __flush_tlb_page(asid, page);
-
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
-
- if (mm->context != NO_CONTEXT) {
- 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 */
- mm->context = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm);
- } else {
- 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);
- }
-
- while (start < end) {
- __flush_tlb_page(asid, start);
- start += PAGE_SIZE;
- }
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- }
- local_irq_restore(flags);
- }
-}
-
-/*
- * 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;
-
- 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;
-
- local_irq_save(flags);
- asid = get_asid();
-
- start &= PAGE_MASK;
- end += (PAGE_SIZE - 1);
- end &= PAGE_MASK;
-
- while (start < end) {
- __flush_tlb_page(asid, start);
- start += PAGE_SIZE;
- }
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
- /* Invalidate all TLB entries of this process by getting a new ASID */
- if (mm->context != NO_CONTEXT) {
- unsigned long flags;
-
- local_irq_save(flags);
- mm->context = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm);
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_all(void)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- sysreg_write(MMUCR, sysreg_read(MMUCR) | SYSREG_BIT(MMUCR_I));
- local_irq_restore(flags);
-}
-
-#ifdef CONFIG_PROC_FS
-
-#include <linux/seq_file.h>
-#include <linux/proc_fs.h>
-#include <linux/init.h>
-
-static void *tlb_start(struct seq_file *tlb, loff_t *pos)
-{
- static unsigned long tlb_index;
-
- if (*pos >= NR_TLB_ENTRIES)
- return NULL;
-
- tlb_index = 0;
- return &tlb_index;
-}
-
-static void *tlb_next(struct seq_file *tlb, void *v, loff_t *pos)
-{
- unsigned long *index = v;
-
- if (*index >= NR_TLB_ENTRIES - 1)
- return NULL;
-
- ++*pos;
- ++*index;
- return index;
-}
-
-static void tlb_stop(struct seq_file *tlb, void *v)
-{
-
-}
-
-static int tlb_show(struct seq_file *tlb, void *v)
-{
- unsigned int tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save;
- unsigned long flags;
- unsigned long *index = v;
-
- if (*index == 0)
- seq_puts(tlb, "ID V G ASID VPN PFN AP SZ C B W D\n");
-
- BUG_ON(*index >= NR_TLB_ENTRIES);
-
- local_irq_save(flags);
- mmucr_save = sysreg_read(MMUCR);
- tlbehi_save = sysreg_read(TLBEHI);
- mmucr = SYSREG_BFINS(DRP, *index, mmucr_save);
- sysreg_write(MMUCR, mmucr);
-
- /* TLBR might change the ASID */
- __builtin_tlbr();
- cpu_sync_pipeline();
-
- tlbehi = sysreg_read(TLBEHI);
- tlbelo = sysreg_read(TLBELO);
-
- sysreg_write(MMUCR, mmucr_save);
- sysreg_write(TLBEHI, tlbehi_save);
- cpu_sync_pipeline();
- local_irq_restore(flags);
-
- seq_printf(tlb, "%2lu: %c %c %02x %05x %05x %o %o %c %c %c %c\n",
- *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;
-}
-
-static const struct seq_operations tlb_ops = {
- .start = tlb_start,
- .next = tlb_next,
- .stop = tlb_stop,
- .show = tlb_show,
-};
-
-static int tlb_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &tlb_ops);
-}
-
-static const struct file_operations proc_tlb_operations = {
- .open = tlb_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static int __init proctlb_init(void)
-{
- proc_create("tlb", 0, NULL, &proc_tlb_operations);
- return 0;
-}
-late_initcall(proctlb_init);
-#endif /* CONFIG_PROC_FS */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 06:20:47 +0300