diff options
Diffstat (limited to 'arch/mips/lib/dump_tlb.c')
| -rw-r--r-- | arch/mips/lib/dump_tlb.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/arch/mips/lib/dump_tlb.c b/arch/mips/lib/dump_tlb.c new file mode 100644 index 000000000000..fbf4b72f4306 --- /dev/null +++ b/arch/mips/lib/dump_tlb.c @@ -0,0 +1,242 @@ +/* + * 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/cpu.h> +#include <asm/mipsregs.h> +#include <asm/page.h> +#include <asm/pgtable.h> + +static inline const char *msk2str(unsigned int mask) +{ + switch (mask) { + case PM_4K: return "4kb"; + case PM_16K: return "16kb"; + case PM_64K: return "64kb"; + case PM_256K: return "256kb"; +#ifndef CONFIG_CPU_VR41XX + case PM_1M: return "1Mb"; + case PM_4M: return "4Mb"; + case PM_16M: return "16Mb"; + case PM_64M: return "64Mb"; + case PM_256M: return "256Mb"; +#endif + } + return ""; +} + +#define BARRIER() \ + __asm__ __volatile__( \ + ".set\tnoreorder\n\t" \ + "nop;nop;nop;nop;nop;nop;nop\n\t" \ + ".set\treorder"); + +void dump_tlb(int first, int last) +{ + unsigned long s_entryhi, entryhi, asid; + unsigned long long entrylo0, entrylo1; + unsigned int s_index, pagemask, c0, c1, i; + + s_entryhi = read_c0_entryhi(); + s_index = read_c0_index(); + asid = s_entryhi & 0xff; + + for (i = first; i <= last; i++) { + write_c0_index(i); + BARRIER(); + tlb_read(); + BARRIER(); + pagemask = read_c0_pagemask(); + entryhi = read_c0_entryhi(); + entrylo0 = read_c0_entrylo0(); + entrylo1 = read_c0_entrylo1(); + + /* Unused entries have a virtual address of CKSEG0. */ + if ((entryhi & ~0x1ffffUL) != CKSEG0 + && (entryhi & 0xff) == asid) { +#ifdef CONFIG_32BIT + int width = 8; +#else + int width = 11; +#endif + /* + * Only print entries in use + */ + printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); + + c0 = (entrylo0 >> 3) & 7; + c1 = (entrylo1 >> 3) & 7; + + printk("va=%0*lx asid=%02lx\n", + width, (entryhi & ~0x1fffUL), + entryhi & 0xff); + printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ", + width, + (entrylo0 << 6) & PAGE_MASK, c0, + (entrylo0 & 4) ? 1 : 0, + (entrylo0 & 2) ? 1 : 0, + (entrylo0 & 1) ? 1 : 0); + printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n", + width, + (entrylo1 << 6) & PAGE_MASK, c1, + (entrylo1 & 4) ? 1 : 0, + (entrylo1 & 2) ? 1 : 0, + (entrylo1 & 1) ? 1 : 0); + } + } + printk("\n"); + + write_c0_entryhi(s_entryhi); + write_c0_index(s_index); +} + +void dump_tlb_all(void) +{ + dump_tlb(0, current_cpu_data.tlbsize - 1); +} + +void dump_tlb_wired(void) +{ + int wired; + + wired = read_c0_wired(); + printk("Wired: %d", wired); + dump_tlb(0, read_c0_wired()); +} + +void dump_tlb_addr(unsigned long addr) +{ + unsigned int flags, oldpid; + int index; + + local_irq_save(flags); + oldpid = read_c0_entryhi() & 0xff; + BARRIER(); + write_c0_entryhi((addr & PAGE_MASK) | oldpid); + BARRIER(); + tlb_probe(); + BARRIER(); + index = read_c0_index(); + write_c0_entryhi(oldpid); + local_irq_restore(flags); + + if (index < 0) { + printk("No entry for address 0x%08lx in TLB\n", addr); + return; + } + + printk("Entry %d maps address 0x%08lx\n", index, addr); + dump_tlb(index, index); +} + +void dump_tlb_nonwired(void) +{ + dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1); +} + +void dump_list_process(struct task_struct *t, void *address) +{ + pgd_t *page_dir, *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte, page; + unsigned long addr, val; + int width = sizeof(long) * 2; + + addr = (unsigned long) address; + + printk("Addr == %08lx\n", addr); +#ifdef CONFIG_64BIT + printk("tasks->mm.pgd == %08lx\n", (unsigned long) t->mm->pgd); +#endif + +#ifdef CONFIG_64BIT + page_dir = pgd_offset(t->mm, 0UL); + pgd = pgd_offset(t->mm, addr); +#else + if (addr > KSEG0) { + page_dir = pgd_offset_k(0); + pgd = pgd_offset_k(addr); + } else if (t->mm) { + page_dir = pgd_offset(t->mm, 0); + pgd = pgd_offset(t->mm, addr); + } else { + printk("Current thread has no mm\n"); + return; + } +#endif + printk("page_dir == %0*lx\n", width, (unsigned long) page_dir); + printk("pgd == %0*lx\n", width, (unsigned long) pgd); + + pud = pud_offset(pgd, addr); + printk("pud == %0*lx\n", width, (unsigned long) pud); + + pmd = pmd_offset(pud, addr); + printk("pmd == %0*lx\n", width, (unsigned long) pmd); + + pte = pte_offset(pmd, addr); + printk("pte == %0*lx\n", width, (unsigned long) pte); + + page = *pte; +#ifdef CONFIG_64BIT_PHYS_ADDR + printk("page == %08Lx\n", pte_val(page)); +#else + printk("page == %0*lx\n", width, pte_val(page)); +#endif + + 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 long vtop(void *address) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + unsigned long addr, paddr; + + addr = (unsigned long) address; + pgd = pgd_offset(current->mm, addr); + pud = pud_offset(pgd, addr); + pmd = pmd_offset(pud, addr); + pte = pte_offset(pmd, addr); + paddr = (CKSEG1 | (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, *p); + p++; + printk("*%08lx == %08lx\n", (unsigned long)p, *p); + p++; + } +} |