dump_tlb.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- /*
- * Dump R4x00 TLB for debugging purposes.
- *
- * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
- * Copyright (C) 1999 by Silicon Graphics, Inc.
- */
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <asm/bootinfo.h>
- #include <asm/cachectl.h>
- #include <asm/mipsregs.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #define mips_tlb_entries 64
- void
- dump_tlb(int first, int last)
- {
- unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
- unsigned int s_index, pagemask, c0, c1, i;
- s_entryhi = get_entryhi();
- s_index = get_index();
- asid = s_entryhi & 0xff;
- for (i = first; i <= last; i++) {
- write_32bit_cp0_register(CP0_INDEX, i);
- __asm__ __volatile__(
- ".settnoreordernt"
- "nop;nop;nop;nopnt"
- "tlbrnt"
- "nop;nop;nop;nopnt"
- ".settreorder");
- pagemask = read_32bit_cp0_register(CP0_PAGEMASK);
- entryhi = get_entryhi();
- entrylo0 = get_entrylo0();
- entrylo1 = get_entrylo1();
- /* Unused entries have a virtual address of CKSEG0. */
- if ((entryhi & ~0x1ffffUL) != CKSEG0
- && (entryhi & 0xff) == asid) {
- /*
- * Only print entries in use
- */
- printk("Index: %2d pgmask=%08x ", i, pagemask);
- c0 = (entrylo0 >> 3) & 7;
- c1 = (entrylo1 >> 3) & 7;
- printk("va=%08lx asid=%02lx"
- " [pa=%06lx c=%d d=%d v=%d g=%ld]"
- " [pa=%06lx c=%d d=%d v=%d g=%ld]n",
- (entryhi & ~0x1fffUL),
- entryhi & 0xff,
- entrylo0 & PAGE_MASK, c0,
- (entrylo0 & 4) ? 1 : 0,
- (entrylo0 & 2) ? 1 : 0,
- (entrylo0 & 1),
- entrylo1 & PAGE_MASK, c1,
- (entrylo1 & 4) ? 1 : 0,
- (entrylo1 & 2) ? 1 : 0,
- (entrylo1 & 1));
-
- }
- }
- printk("n");
- set_entryhi(s_entryhi);
- set_index(s_index);
- }
- void
- dump_tlb_all(void)
- {
- dump_tlb(0, mips_tlb_entries - 1);
- }
- void
- dump_tlb_wired(void)
- {
- int wired;
- wired = read_32bit_cp0_register(CP0_WIRED);
- printk("Wired: %d", wired);
- dump_tlb(0, read_32bit_cp0_register(CP0_WIRED));
- }
- #define BARRIER
- __asm__ __volatile__(
- ".settnoreordernt"
- "nop;nop;nop;nop;nop;nop;nopnt"
- ".settreorder");
- void
- dump_tlb_addr(unsigned long addr)
- {
- unsigned int flags, oldpid;
- int index;
- __save_and_cli(flags);
- oldpid = get_entryhi() & 0xff;
- BARRIER;
- set_entryhi((addr & PAGE_MASK) | oldpid);
- BARRIER;
- tlb_probe();
- BARRIER;
- index = get_index();
- set_entryhi(oldpid);
- __restore_flags(flags);
- if (index < 0) {
- printk("No entry for address 0x%08lx in TLBn", addr);
- return;
- }
- printk("Entry %d maps address 0x%08lxn", index, addr);
- dump_tlb(index, index);
- }
- void
- dump_tlb_nonwired(void)
- {
- dump_tlb(read_32bit_cp0_register(CP0_WIRED), mips_tlb_entries - 1);
- }
- void
- dump_list_process(struct task_struct *t, void *address)
- {
- pgd_t *page_dir, *pgd;
- pmd_t *pmd;
- pte_t *pte, page;
- unsigned long addr;
- unsigned long val;
- addr = (unsigned long) address;
- printk("Addr == %08lxn", addr);
- printk("tasks->mm.pgd == %08lxn", (unsigned long) t->mm->pgd);
- page_dir = pgd_offset(t->mm, 0);
- printk("page_dir == %08lxn", (unsigned long) page_dir);
- pgd = pgd_offset(t->mm, addr);
- printk("pgd == %08lx, ", (unsigned long) pgd);
- pmd = pmd_offset(pgd, addr);
- printk("pmd == %08lx, ", (unsigned long) pmd);
- pte = pte_offset(pmd, addr);
- printk("pte == %08lx, ", (unsigned long) pte);
- page = *pte;
- printk("page == %08lxn", (unsigned long) pte_val(page));
- val = pte_val(page);
- if (val & _PAGE_PRESENT) printk("present ");
- if (val & _PAGE_READ) printk("read ");
- if (val & _PAGE_WRITE) printk("write ");
- if (val & _PAGE_ACCESSED) printk("accessed ");
- if (val & _PAGE_MODIFIED) printk("modified ");
- if (val & _PAGE_R4KBUG) printk("r4kbug ");
- if (val & _PAGE_GLOBAL) printk("global ");
- if (val & _PAGE_VALID) printk("valid ");
- printk("n");
- }
- void dump_list_current(void *address)
- {
- dump_list_process(current, address);
- }
- unsigned int vtop(void *address)
- {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- unsigned int addr, paddr;
- addr = (unsigned long) address;
- pgd = pgd_offset(current->mm, addr);
- pmd = pmd_offset(pgd, addr);
- pte = pte_offset(pmd, addr);
- paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
- paddr |= (addr & ~PAGE_MASK);
- return paddr;
- }
- void dump16(unsigned long *p)
- {
- int i;
- for(i=0;i<8;i++)
- {
- printk("*%08lx == %08lx, ",
- (unsigned long)p, (unsigned long)*p);
- p++;
- printk("*%08lx == %08lxn",
- (unsigned long)p, (unsigned long)*p);
- p++;
- }
- }