+++ /dev/null
-/*
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
- * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-#include <linux/init.h>
-#include <asm/mmu_context.h>
-#include <asm/bootinfo.h>
-#include <asm/cpu.h>
-
-extern void build_tlb_refill_handler(void);
-
-#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
-
-/* Dump the current entry* and pagemask registers */
-static inline void dump_cur_tlb_regs(void)
-{
- unsigned int entryhihi, entryhilo, entrylo0hi, entrylo0lo, entrylo1hi;
- unsigned int entrylo1lo, pagemask;
-
- __asm__ __volatile__ (
- ".set push \n"
- ".set noreorder \n"
- ".set mips64 \n"
- ".set noat \n"
- " tlbr \n"
- " dmfc0 $1, $10 \n"
- " dsrl32 %0, $1, 0 \n"
- " sll %1, $1, 0 \n"
- " dmfc0 $1, $2 \n"
- " dsrl32 %2, $1, 0 \n"
- " sll %3, $1, 0 \n"
- " dmfc0 $1, $3 \n"
- " dsrl32 %4, $1, 0 \n"
- " sll %5, $1, 0 \n"
- " mfc0 %6, $5 \n"
- ".set pop \n"
- : "=r" (entryhihi), "=r" (entryhilo),
- "=r" (entrylo0hi), "=r" (entrylo0lo),
- "=r" (entrylo1hi), "=r" (entrylo1lo),
- "=r" (pagemask));
-
- printk("%08X%08X %08X%08X %08X%08X %08X",
- entryhihi, entryhilo,
- entrylo0hi, entrylo0lo,
- entrylo1hi, entrylo1lo,
- pagemask);
-}
-
-void sb1_dump_tlb(void)
-{
- unsigned long old_ctx;
- unsigned long flags;
- int entry;
- local_irq_save(flags);
- old_ctx = read_c0_entryhi();
- printk("Current TLB registers state:\n"
- " EntryHi EntryLo0 EntryLo1 PageMask Index\n"
- "--------------------------------------------------------------------\n");
- dump_cur_tlb_regs();
- printk(" %08X\n", read_c0_index());
- printk("\n\nFull TLB Dump:\n"
- "Idx EntryHi EntryLo0 EntryLo1 PageMask\n"
- "--------------------------------------------------------------\n");
- for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
- write_c0_index(entry);
- printk("\n%02i ", entry);
- dump_cur_tlb_regs();
- }
- printk("\n");
- write_c0_entryhi(old_ctx);
- local_irq_restore(flags);
-}
-
-void local_flush_tlb_all(void)
-{
- unsigned long flags;
- unsigned long old_ctx;
- int entry;
-
- local_irq_save(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = read_c0_entryhi();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
-
- entry = read_c0_wired();
- while (entry < current_cpu_data.tlbsize) {
- write_c0_entryhi(UNIQUE_ENTRYHI(entry));
- write_c0_index(entry);
- tlb_write_indexed();
- entry++;
- }
- write_c0_entryhi(old_ctx);
- local_irq_restore(flags);
-}
-
-
-/*
- * Use a bogus region of memory (starting at 0) to sanitize the TLB's.
- * Use increments of the maximum page size (16MB), and check for duplicate
- * entries before doing a given write. Then, when we're safe from collisions
- * with the firmware, go back and give all the entries invalid addresses with
- * the normal flush routine. Wired entries will be killed as well!
- */
-static void __init sb1_sanitize_tlb(void)
-{
- int entry;
- long addr = 0;
-
- long inc = 1<<24; /* 16MB */
- /* Save old context and create impossible VPN2 value */
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
- do {
- addr += inc;
- write_c0_entryhi(addr);
- tlb_probe();
- } while ((int)(read_c0_index()) >= 0);
- write_c0_index(entry);
- tlb_write_indexed();
- }
- /* Now that we know we're safe from collisions, we can safely flush
- the TLB with the "normal" routine. */
- local_flush_tlb_all();
-}
-
-void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
- int cpu = smp_processor_id();
-
- if (cpu_context(cpu, mm) != 0) {
- unsigned long flags;
- int size;
-
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- size = (size + 1) >> 1;
- local_irq_save(flags);
- if (size <= (current_cpu_data.tlbsize/2)) {
- int oldpid = read_c0_entryhi();
- int newpid = cpu_asid(cpu, mm);
-
- start &= (PAGE_MASK << 1);
- end += ((PAGE_SIZE << 1) - 1);
- end &= (PAGE_MASK << 1);
- while (start < end) {
- int idx;
-
- write_c0_entryhi(start | newpid);
- start += (PAGE_SIZE << 1);
- tlb_probe();
- idx = read_c0_index();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- if (idx < 0)
- continue;
- write_c0_entryhi(UNIQUE_ENTRYHI(idx));
- tlb_write_indexed();
- }
- write_c0_entryhi(oldpid);
- } else {
- drop_mmu_context(mm, cpu);
- }
- local_irq_restore(flags);
- }
-}
-
-void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
- unsigned long flags;
- int size;
-
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- size = (size + 1) >> 1;
- local_irq_save(flags);
- if (size <= (current_cpu_data.tlbsize/2)) {
- int pid = read_c0_entryhi();
-
- start &= (PAGE_MASK << 1);
- end += ((PAGE_SIZE << 1) - 1);
- end &= (PAGE_MASK << 1);
-
- while (start < end) {
- int idx;
-
- write_c0_entryhi(start);
- start += (PAGE_SIZE << 1);
- tlb_probe();
- idx = read_c0_index();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- if (idx < 0)
- continue;
- write_c0_entryhi(UNIQUE_ENTRYHI(idx));
- tlb_write_indexed();
- }
- write_c0_entryhi(pid);
- } else {
- local_flush_tlb_all();
- }
- local_irq_restore(flags);
-}
-
-void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
- int cpu = smp_processor_id();
-
- if (cpu_context(cpu, vma->vm_mm) != 0) {
- unsigned long flags;
- int oldpid, newpid, idx;
-
- newpid = cpu_asid(cpu, vma->vm_mm);
- page &= (PAGE_MASK << 1);
- local_irq_save(flags);
- oldpid = read_c0_entryhi();
- write_c0_entryhi(page | newpid);
- tlb_probe();
- idx = read_c0_index();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- if (idx < 0)
- goto finish;
- /* Make sure all entries differ. */
- write_c0_entryhi(UNIQUE_ENTRYHI(idx));
- tlb_write_indexed();
-
- finish:
- write_c0_entryhi(oldpid);
- local_irq_restore(flags);
- }
-}
-
-/*
- * Remove one kernel space TLB entry. This entry is assumed to be marked
- * global so we don't do the ASID thing.
- */
-void local_flush_tlb_one(unsigned long page)
-{
- unsigned long flags;
- int oldpid, idx;
-
- local_irq_save(flags);
- oldpid = read_c0_entryhi();
- page &= (PAGE_MASK << 1);
- write_c0_entryhi(page);
- tlb_probe();
- idx = read_c0_index();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- if (idx >= 0) {
- /* Make sure all entries differ. */
- write_c0_entryhi(UNIQUE_ENTRYHI(idx));
- tlb_write_indexed();
- }
-
- write_c0_entryhi(oldpid);
- local_irq_restore(flags);
-}
-
-/* All entries common to a mm share an asid. To effectively flush
- these entries, we just bump the asid. */
-void local_flush_tlb_mm(struct mm_struct *mm)
-{
- int cpu;
-
- preempt_disable();
-
- cpu = smp_processor_id();
-
- if (cpu_context(cpu, mm) != 0) {
- drop_mmu_context(mm, cpu);
- }
-
- preempt_enable();
-}
-
-/* Stolen from mips32 routines */
-
-void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
-{
- unsigned long flags;
- pgd_t *pgdp;
- pud_t *pudp;
- pmd_t *pmdp;
- pte_t *ptep;
- int idx, pid;
-
- /*
- * Handle debugger faulting in for debugee.
- */
- if (current->active_mm != vma->vm_mm)
- return;
-
- local_irq_save(flags);
-
- pid = read_c0_entryhi() & ASID_MASK;
- address &= (PAGE_MASK << 1);
- write_c0_entryhi(address | pid);
- pgdp = pgd_offset(vma->vm_mm, address);
- tlb_probe();
- pudp = pud_offset(pgdp, address);
- pmdp = pmd_offset(pudp, address);
- idx = read_c0_index();
- ptep = pte_offset_map(pmdp, address);
-
-#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
- write_c0_entrylo0(ptep->pte_high);
- ptep++;
- write_c0_entrylo1(ptep->pte_high);
-#else
- write_c0_entrylo0(pte_val(*ptep++) >> 6);
- write_c0_entrylo1(pte_val(*ptep) >> 6);
-#endif
- if (idx < 0)
- tlb_write_random();
- else
- tlb_write_indexed();
- local_irq_restore(flags);
-}
-
-void __init add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
- unsigned long entryhi, unsigned long pagemask)
-{
- unsigned long flags;
- unsigned long wired;
- unsigned long old_pagemask;
- unsigned long old_ctx;
-
- local_irq_save(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = read_c0_entryhi();
- old_pagemask = read_c0_pagemask();
- wired = read_c0_wired();
- write_c0_wired(wired + 1);
- write_c0_index(wired);
-
- write_c0_pagemask(pagemask);
- write_c0_entryhi(entryhi);
- write_c0_entrylo0(entrylo0);
- write_c0_entrylo1(entrylo1);
- tlb_write_indexed();
-
- write_c0_entryhi(old_ctx);
- write_c0_pagemask(old_pagemask);
-
- local_flush_tlb_all();
- local_irq_restore(flags);
-}
-
-/*
- * This is called from loadmmu.c. We have to set up all the
- * memory management function pointers, as well as initialize
- * the caches and tlbs
- */
-void tlb_init(void)
-{
- write_c0_pagemask(PM_DEFAULT_MASK);
- write_c0_wired(0);
-
- /*
- * We don't know what state the firmware left the TLB's in, so this is
- * the ultra-conservative way to flush the TLB's and avoid machine
- * check exceptions due to duplicate TLB entries
- */
- sb1_sanitize_tlb();
-
- build_tlb_refill_handler();
-}
projects / karo-tx-linux.git / commitdiff