arch/mips64/lib/dump_tlb.c

   1 /*
   2  * Dump R4x00 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  */
   7 #include <linux/kernel.h>
   8 #include <linux/mm.h>
   9 #include <linux/sched.h>
  10 #include <linux/string.h>
  11
  12 #include <asm/bootinfo.h>
  13 #include <asm/cachectl.h>
  14 #include <asm/cpu.h>
  15 #include <asm/mipsregs.h>
  16 #include <asm/page.h>
  17 #include <asm/pgtable.h>
  18
  19 static inline const char *msk2str(unsigned int mask)
  20 {
  21         switch (mask) {
  22         case PM_4K:     return "4kb";
  23         case PM_16K:    return "16kb";
  24         case PM_64K:    return "64kb";
  25         case PM_256K:   return "256kb";
  26         case PM_1M:     return "1Mb";
  27         case PM_4M:     return "4Mb";
  28         case PM_16M:    return "16Mb";
  29         case PM_64M:    return "64Mb";
  30         case PM_256M:   return "256Mb";
  31         }
  32 }
  33
  34 void dump_tlb(int first, int last)
  35 {
  36         unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
  37         unsigned int s_index, pagemask, c0, c1, i;
  38
  39         s_entryhi = read_c0_entryhi();
  40         s_index = read_c0_index();
  41         asid = s_entryhi & 0xff;
  42
  43         for (i = first; i <= last; i++) {
  44                 write_c0_index(i);
  45                 __asm__ __volatile__(
  46                         ".set\tnoreorder\n\t"
  47                         "nop;nop;nop;nop\n\t"
  48                         "tlbr\n\t"
  49                         "nop;nop;nop;nop\n\t"
  50                         ".set\treorder");
  51                 pagemask = read_c0_pagemask();
  52                 entryhi  = read_c0_entryhi();
  53                 entrylo0 = read_c0_entrylo0();
  54                 entrylo1 = read_c0_entrylo1();
  55
  56                 /* Unused entries have a virtual address of CKSEG0.  */
  57                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  58                     && (entryhi & 0xff) == asid) {
  59                         /*
  60                          * Only print entries in use
  61                          */
  62                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  63
  64                         c0 = (entrylo0 >> 3) & 7;
  65                         c1 = (entrylo1 >> 3) & 7;
  66
  67                         printk("va=%011lx asid=%02lx\n",
  68                                (entryhi & ~0x1fffUL),
  69                                entryhi & 0xff);
  70                         printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ",
  71                                (entrylo0 << 6) & PAGE_MASK, c0,
  72                                (entrylo0 & 4) ? 1 : 0,
  73                                (entrylo0 & 2) ? 1 : 0,
  74                                (entrylo0 & 1));
  75                         printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n",
  76                                (entrylo1 << 6) & PAGE_MASK, c1,
  77                                (entrylo1 & 4) ? 1 : 0,
  78                                (entrylo1 & 2) ? 1 : 0,
  79                                (entrylo1 & 1));
  80                 }
  81         }
  82         printk("\n");
  83
  84         write_c0_entryhi(s_entryhi);
  85         write_c0_index(s_index);
  86 }
  87
  88 void dump_tlb_all(void)
  89 {
  90         dump_tlb(0, current_cpu_data.tlbsize - 1);
  91 }
  92
  93 void dump_tlb_wired(void)
  94 {
  95         int     wired;
  96
  97         wired = read_c0_wired();
  98         printk("Wired: %d", wired);
  99         dump_tlb(0, read_c0_wired());
 100 }
 101
 102 #define BARRIER                                         \
 103         __asm__ __volatile__(                           \
 104                 ".set\tnoreorder\n\t"                   \
 105                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
 106                 ".set\treorder");
 107
 108 void dump_tlb_addr(unsigned long addr)
 109 {
 110         unsigned int flags, oldpid;
 111         int index;
 112
 113         local_irq_save(flags);
 114         oldpid = read_c0_entryhi() & 0xff;
 115         BARRIER;
 116         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 117         BARRIER;
 118         tlb_probe();
 119         BARRIER;
 120         index = read_c0_index();
 121         write_c0_entryhi(oldpid);
 122         local_irq_restore(flags);
 123
 124         if (index < 0) {
 125                 printk("No entry for address 0x%08lx in TLB\n", addr);
 126                 return;
 127         }
 128
 129         printk("Entry %d maps address 0x%08lx\n", index, addr);
 130         dump_tlb(index, index);
 131 }
 132
 133 void dump_tlb_nonwired(void)
 134 {
 135         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 136 }
 137
 138 void dump_list_process(struct task_struct *t, void *address)
 139 {
 140         pgd_t   *page_dir, *pgd;
 141         pmd_t   *pmd;
 142         pte_t   *pte, page;
 143         unsigned long addr;
 144         unsigned long val;
 145
 146         addr = (unsigned long) address;
 147
 148         printk("Addr                 == %08lx\n", addr);
 149         printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
 150
 151         page_dir = pgd_offset(t->mm, 0);
 152         printk("page_dir == %08lx\n", (unsigned long) page_dir);
 153
 154         pgd = pgd_offset(t->mm, addr);
 155         printk("pgd == %08lx, ", (unsigned long) pgd);
 156
 157         pmd = pmd_offset(pgd, addr);
 158         printk("pmd == %08lx, ", (unsigned long) pmd);
 159
 160         pte = pte_offset(pmd, addr);
 161         printk("pte == %08lx, ", (unsigned long) pte);
 162
 163         page = *pte;
 164         printk("page == %08lx\n", pte_val(page));
 165
 166         val = pte_val(page);
 167         if (val & _PAGE_PRESENT) printk("present ");
 168         if (val & _PAGE_READ) printk("read ");
 169         if (val & _PAGE_WRITE) printk("write ");
 170         if (val & _PAGE_ACCESSED) printk("accessed ");
 171         if (val & _PAGE_MODIFIED) printk("modified ");
 172         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 173         if (val & _PAGE_GLOBAL) printk("global ");
 174         if (val & _PAGE_VALID) printk("valid ");
 175         printk("\n");
 176 }
 177
 178 void dump_list_current(void *address)
 179 {
 180         dump_list_process(current, address);
 181 }
 182
 183 unsigned int vtop(void *address)
 184 {
 185         pgd_t   *pgd;
 186         pmd_t   *pmd;
 187         pte_t   *pte;
 188         unsigned int addr, paddr;
 189
 190         addr = (unsigned long) address;
 191         pgd = pgd_offset(current->mm, addr);
 192         pmd = pmd_offset(pgd, addr);
 193         pte = pte_offset(pmd, addr);
 194         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 195         paddr |= (addr & ~PAGE_MASK);
 196
 197         return paddr;
 198 }
 199
 200 void dump16(unsigned long *p)
 201 {
 202         int i;
 203
 204         for(i = 0; i < 8; i++) {
 205                 printk("*%08lx == %08lx, ",
 206                        (unsigned long)p, (unsigned long)*p);
 207                 p++;
 208                 printk("*%08lx == %08lx\n",
 209                        (unsigned long)p, (unsigned long)*p);
 210                 p++;
 211         }
 212 }