arch/mips/lib-32/r3k_dump_tlb.c

   1 /*
   2  * Dump R3000 TLB for debugging purposes.
   3  *
   4  * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
   5  * Copyright (C) 1999 by Silicon Graphics, Inc.
   6  * Copyright (C) 1999 by Harald Koerfgen
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/sched.h>
  11 #include <linux/string.h>
  12
  13 #include <asm/bootinfo.h>
  14 #include <asm/cachectl.h>
  15 #include <asm/cpu.h>
  16 #include <asm/mipsregs.h>
  17 #include <asm/page.h>
  18 #include <asm/pgtable.h>
  19
  20 extern int r3k_have_wired_reg;  /* defined in tlb-r3k.c */
  21
  22 void dump_tlb(int first, int last)
  23 {
  24         int     i;
  25         unsigned int asid;
  26         unsigned long entryhi, entrylo0;
  27
  28         asid = read_c0_entryhi() & 0xfc0;
  29
  30         for (i = first; i <= last; i++) {
  31                 write_c0_index(i<<8);
  32                 __asm__ __volatile__(
  33                         ".set\tnoreorder\n\t"
  34                         "tlbr\n\t"
  35                         "nop\n\t"
  36                         ".set\treorder");
  37                 entryhi  = read_c0_entryhi();
  38                 entrylo0 = read_c0_entrylo0();
  39
  40                 /* Unused entries have a virtual address of KSEG0.  */
  41                 if ((entryhi & 0xffffe000) != 0x80000000
  42                     && (entryhi & 0xfc0) == asid) {
  43                         /*
  44                          * Only print entries in use
  45                          */
  46                         printk("Index: %2d ", i);
  47
  48                         printk("va=%08lx asid=%08lx"
  49                                "  [pa=%06lx n=%d d=%d v=%d g=%d]",
  50                                (entryhi & 0xffffe000),
  51                                entryhi & 0xfc0,
  52                                entrylo0 & PAGE_MASK,
  53                                (entrylo0 & (1 << 11)) ? 1 : 0,
  54                                (entrylo0 & (1 << 10)) ? 1 : 0,
  55                                (entrylo0 & (1 << 9)) ? 1 : 0,
  56                                (entrylo0 & (1 << 8)) ? 1 : 0);
  57                 }
  58         }
  59         printk("\n");
  60
  61         write_c0_entryhi(asid);
  62 }
  63
  64 void dump_tlb_all(void)
  65 {
  66         dump_tlb(0, current_cpu_data.tlbsize - 1);
  67 }
  68
  69 void dump_tlb_wired(void)
  70 {
  71         int wired = r3k_have_wired_reg ? read_c0_wired() : 8;
  72
  73         printk("Wired: %d", wired);
  74         dump_tlb(0, wired - 1);
  75 }
  76
  77 void dump_tlb_addr(unsigned long addr)
  78 {
  79         unsigned long flags, oldpid;
  80         int index;
  81
  82         local_irq_save(flags);
  83         oldpid = read_c0_entryhi() & 0xff;
  84         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
  85         tlb_probe();
  86         index = read_c0_index();
  87         write_c0_entryhi(oldpid);
  88         local_irq_restore(flags);
  89
  90         if (index < 0) {
  91                 printk("No entry for address 0x%08lx in TLB\n", addr);
  92                 return;
  93         }
  94
  95         printk("Entry %d maps address 0x%08lx\n", index, addr);
  96         dump_tlb(index, index);
  97 }
  98
  99 void dump_tlb_nonwired(void)
 100 {
 101         int wired = r3k_have_wired_reg ? read_c0_wired() : 8;
 102         dump_tlb(wired, current_cpu_data.tlbsize - 1);
 103 }
 104
 105 void dump_list_process(struct task_struct *t, void *address)
 106 {
 107         pgd_t   *page_dir, *pgd;
 108         pud_t   *pud;
 109         pmd_t   *pmd;
 110         pte_t   *pte, page;
 111         unsigned int addr;
 112         unsigned long val;
 113
 114         addr = (unsigned int) address;
 115
 116         printk("Addr                 == %08x\n", addr);
 117         printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 118
 119         page_dir = pgd_offset(t->mm, 0);
 120         printk("page_dir == %08x\n", (unsigned int) page_dir);
 121
 122         pgd = pgd_offset(t->mm, addr);
 123         printk("pgd == %08x, ", (unsigned int) pgd);
 124
 125         pud = pud_offset(pgd, addr);
 126         printk("pud == %08x, ", (unsigned int) pud);
 127
 128         pmd = pmd_offset(pud, addr);
 129         printk("pmd == %08x, ", (unsigned int) pmd);
 130
 131         pte = pte_offset(pmd, addr);
 132         printk("pte == %08x, ", (unsigned int) pte);
 133
 134         page = *pte;
 135         printk("page == %08x\n", (unsigned int) pte_val(page));
 136
 137         val = pte_val(page);
 138         if (val & _PAGE_PRESENT) printk("present ");
 139         if (val & _PAGE_READ) printk("read ");
 140         if (val & _PAGE_WRITE) printk("write ");
 141         if (val & _PAGE_ACCESSED) printk("accessed ");
 142         if (val & _PAGE_MODIFIED) printk("modified ");
 143         if (val & _PAGE_GLOBAL) printk("global ");
 144         if (val & _PAGE_VALID) printk("valid ");
 145         printk("\n");
 146 }
 147
 148 void dump_list_current(void *address)
 149 {
 150         dump_list_process(current, address);
 151 }
 152
 153 unsigned int vtop(void *address)
 154 {
 155         pgd_t   *pgd;
 156         pud_t   *pud;
 157         pmd_t   *pmd;
 158         pte_t   *pte;
 159         unsigned int addr, paddr;
 160
 161         addr = (unsigned long) address;
 162         pgd = pgd_offset(current->mm, addr);
 163         pud = pud_offset(pgd, addr);
 164         pmd = pmd_offset(pud, addr);
 165         pte = pte_offset(pmd, addr);
 166         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 167         paddr |= (addr & ~PAGE_MASK);
 168
 169         return paddr;
 170 }
 171
 172 void dump16(unsigned long *p)
 173 {
 174         int i;
 175
 176         for (i = 0; i < 8; i++) {
 177                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 178                 p++;
 179                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 180                 p++;
 181         }
 182 }