arch/mips/lib-64/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/config.h>
   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 static inline const char *msk2str(unsigned int mask)
  21 {
  22         switch (mask) {
  23         case PM_4K:     return "4kb";
  24         case PM_16K:    return "16kb";
  25         case PM_64K:    return "64kb";
  26         case PM_256K:   return "256kb";
  27 #ifndef CONFIG_CPU_VR41XX
  28         case PM_1M:     return "1Mb";
  29         case PM_4M:     return "4Mb";
  30         case PM_16M:    return "16Mb";
  31         case PM_64M:    return "64Mb";
  32         case PM_256M:   return "256Mb";
  33 #endif
  34         }
  35 }
  36
  37 #define BARRIER()                                       \
  38         __asm__ __volatile__(                           \
  39                 ".set\tnoreorder\n\t"                   \
  40                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  41                 ".set\treorder");
  42
  43 void dump_tlb(int first, int last)
  44 {
  45         unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
  46         unsigned int s_index, pagemask, c0, c1, i;
  47
  48         s_entryhi = read_c0_entryhi();
  49         s_index = read_c0_index();
  50         asid = s_entryhi & 0xff;
  51
  52         for (i = first; i <= last; i++) {
  53                 write_c0_index(i);
  54                 BARRIER();
  55                 tlb_read();
  56                 BARRIER();
  57                 pagemask = read_c0_pagemask();
  58                 entryhi  = read_c0_entryhi();
  59                 entrylo0 = read_c0_entrylo0();
  60                 entrylo1 = read_c0_entrylo1();
  61
  62                 /* Unused entries have a virtual address of CKSEG0.  */
  63                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  64                     && (entryhi & 0xff) == asid) {
  65                         /*
  66                          * Only print entries in use
  67                          */
  68                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  69
  70                         c0 = (entrylo0 >> 3) & 7;
  71                         c1 = (entrylo1 >> 3) & 7;
  72
  73                         printk("va=%011lx asid=%02lx\n",
  74                                (entryhi & ~0x1fffUL),
  75                                entryhi & 0xff);
  76                         printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ",
  77                                (entrylo0 << 6) & PAGE_MASK, c0,
  78                                (entrylo0 & 4) ? 1 : 0,
  79                                (entrylo0 & 2) ? 1 : 0,
  80                                (entrylo0 & 1));
  81                         printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n",
  82                                (entrylo1 << 6) & PAGE_MASK, c1,
  83                                (entrylo1 & 4) ? 1 : 0,
  84                                (entrylo1 & 2) ? 1 : 0,
  85                                (entrylo1 & 1));
  86                 }
  87         }
  88         printk("\n");
  89
  90         write_c0_entryhi(s_entryhi);
  91         write_c0_index(s_index);
  92 }
  93
  94 void dump_tlb_all(void)
  95 {
  96         dump_tlb(0, current_cpu_data.tlbsize - 1);
  97 }
  98
  99 void dump_tlb_wired(void)
 100 {
 101         int     wired;
 102
 103         wired = read_c0_wired();
 104         printk("Wired: %d", wired);
 105         dump_tlb(0, read_c0_wired());
 106 }
 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, val;
 144
 145         addr = (unsigned long) address;
 146
 147         printk("Addr                 == %08lx\n", addr);
 148         printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
 149
 150         page_dir = pgd_offset(t->mm, 0);
 151         printk("page_dir == %08lx\n", (unsigned long) page_dir);
 152
 153         pgd = pgd_offset(t->mm, addr);
 154         printk("pgd == %08lx, ", (unsigned long) pgd);
 155
 156         pmd = pmd_offset(pgd, addr);
 157         printk("pmd == %08lx, ", (unsigned long) pmd);
 158
 159         pte = pte_offset(pmd, addr);
 160         printk("pte == %08lx, ", (unsigned long) pte);
 161
 162         page = *pte;
 163         printk("page == %08lx\n", pte_val(page));
 164
 165         val = pte_val(page);
 166         if (val & _PAGE_PRESENT) printk("present ");
 167         if (val & _PAGE_READ) printk("read ");
 168         if (val & _PAGE_WRITE) printk("write ");
 169         if (val & _PAGE_ACCESSED) printk("accessed ");
 170         if (val & _PAGE_MODIFIED) printk("modified ");
 171         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 172         if (val & _PAGE_GLOBAL) printk("global ");
 173         if (val & _PAGE_VALID) printk("valid ");
 174         printk("\n");
 175 }
 176
 177 void dump_list_current(void *address)
 178 {
 179         dump_list_process(current, address);
 180 }
 181
 182 unsigned int vtop(void *address)
 183 {
 184         pgd_t   *pgd;
 185         pmd_t   *pmd;
 186         pte_t   *pte;
 187         unsigned int addr, paddr;
 188
 189         addr = (unsigned long) address;
 190         pgd = pgd_offset(current->mm, addr);
 191         pmd = pmd_offset(pgd, addr);
 192         pte = pte_offset(pmd, addr);
 193         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 194         paddr |= (addr & ~PAGE_MASK);
 195
 196         return paddr;
 197 }
 198
 199 void dump16(unsigned long *p)
 200 {
 201         int i;
 202
 203         for (i = 0; i < 8; i++) {
 204                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 205                 p++;
 206                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 207                 p++;
 208         }
 209 }