arch/mips/lib/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/mipsregs.h>
  16 #include <asm/page.h>
  17 #include <asm/pgtable.h>
  18
  19 #define mips_tlb_entries 64
  20
  21 void
  22 dump_tlb(int first, int last)
  23 {
  24         int     i;
  25         unsigned int asid;
  26         unsigned long entryhi, entrylo0;
  27
  28         asid = get_entryhi() & 0xfc0;
  29
  30         for(i=first;i<=last;i++)
  31         {
  32                 write_32bit_cp0_register(CP0_INDEX, i<<8);
  33                 __asm__ __volatile__(
  34                         ".set\tnoreorder\n\t"
  35                         "tlbr\n\t"
  36                         "nop\n\t"
  37                         ".set\treorder");
  38                 entryhi  = read_32bit_cp0_register(CP0_ENTRYHI);
  39                 entrylo0 = read_32bit_cp0_register(CP0_ENTRYLO0);
  40
  41                 /* Unused entries have a virtual address of KSEG0.  */
  42                 if ((entryhi & 0xffffe000) != 0x80000000
  43                     && (entryhi & 0xfc0) == asid) {
  44                         /*
  45                          * Only print entries in use
  46                          */
  47                         printk("Index: %2d ", i);
  48
  49                         printk("va=%08lx asid=%08lx"
  50                                "  [pa=%06lx n=%d d=%d v=%d g=%d]",
  51                                (entryhi & 0xffffe000),
  52                                entryhi & 0xfc0,
  53                                entrylo0 & PAGE_MASK,
  54                                (entrylo0 & (1 << 11)) ? 1 : 0,
  55                                (entrylo0 & (1 << 10)) ? 1 : 0,
  56                                (entrylo0 & (1 << 9)) ? 1 : 0,
  57                                (entrylo0 & (1 << 8)) ? 1 : 0);
  58                 }
  59         }
  60         printk("\n");
  61
  62         set_entryhi(asid);
  63 }
  64
  65 void
  66 dump_tlb_all(void)
  67 {
  68         dump_tlb(0, mips_tlb_entries - 1);
  69 }
  70
  71 void
  72 dump_tlb_wired(void)
  73 {
  74         int     wired = 7;
  75
  76         printk("Wired: %d", wired);
  77         dump_tlb(0, read_32bit_cp0_register(CP0_WIRED));
  78 }
  79
  80 void
  81 dump_tlb_addr(unsigned long addr)
  82 {
  83         unsigned int flags, oldpid;
  84         int index;
  85
  86         __save_and_cli(flags);
  87         oldpid = get_entryhi() & 0xff;
  88         set_entryhi((addr & PAGE_MASK) | oldpid);
  89         tlb_probe();
  90         index = get_index();
  91         set_entryhi(oldpid);
  92         __restore_flags(flags);
  93
  94         if (index < 0) {
  95                 printk("No entry for address 0x%08lx in TLB\n", addr);
  96                 return;
  97         }
  98
  99         printk("Entry %d maps address 0x%08lx\n", index, addr);
 100         dump_tlb(index, index);
 101 }
 102
 103 void
 104 dump_tlb_nonwired(void)
 105 {
 106         dump_tlb(8, mips_tlb_entries - 1);
 107 }
 108
 109 void
 110 dump_list_process(struct task_struct *t, void *address)
 111 {
 112         pgd_t   *page_dir, *pgd;
 113         pmd_t   *pmd;
 114         pte_t   *pte, page;
 115         unsigned int addr;
 116         unsigned long val;
 117
 118         addr = (unsigned int) address;
 119
 120         printk("Addr                 == %08x\n", addr);
 121         printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 122
 123         page_dir = pgd_offset(t->mm, 0);
 124         printk("page_dir == %08x\n", (unsigned int) page_dir);
 125
 126         pgd = pgd_offset(t->mm, addr);
 127         printk("pgd == %08x, ", (unsigned int) pgd);
 128
 129         pmd = pmd_offset(pgd, addr);
 130         printk("pmd == %08x, ", (unsigned int) pmd);
 131
 132         pte = pte_offset(pmd, addr);
 133         printk("pte == %08x, ", (unsigned int) pte);
 134
 135         page = *pte;
 136         printk("page == %08x\n", (unsigned int) pte_val(page));
 137
 138         val = pte_val(page);
 139         if (val & _PAGE_PRESENT) printk("present ");
 140         if (val & _PAGE_READ) printk("read ");
 141         if (val & _PAGE_WRITE) printk("write ");
 142         if (val & _PAGE_ACCESSED) printk("accessed ");
 143         if (val & _PAGE_MODIFIED) printk("modified ");
 144         if (val & _PAGE_GLOBAL) printk("global ");
 145         if (val & _PAGE_VALID) printk("valid ");
 146         printk("\n");
 147 }
 148
 149 void
 150 dump_list_current(void *address)
 151 {
 152         dump_list_process(current, address);
 153 }
 154
 155 unsigned int
 156 vtop(void *address)
 157 {
 158         pgd_t   *pgd;
 159         pmd_t   *pmd;
 160         pte_t   *pte;
 161         unsigned int addr, paddr;
 162
 163         addr = (unsigned long) address;
 164         pgd = pgd_offset(current->mm, addr);
 165         pmd = pmd_offset(pgd, addr);
 166         pte = pte_offset(pmd, addr);
 167         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 168         paddr |= (addr & ~PAGE_MASK);
 169
 170         return paddr;
 171 }
 172
 173 void
 174 dump16(unsigned long *p)
 175 {
 176         int i;
 177
 178         for(i=0;i<8;i++)
 179         {
 180                 printk("*%08lx == %08lx, ",
 181                        (unsigned long)p, (unsigned long)*p++);
 182                 printk("*%08lx == %08lx\n",
 183                        (unsigned long)p, (unsigned long)*p++);
 184         }
 185 }