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/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 #ifndef CONFIG_CPU_VR41XX
  27         case PM_1M:     return "1Mb";
  28         case PM_4M:     return "4Mb";
  29         case PM_16M:    return "16Mb";
  30         case PM_64M:    return "64Mb";
  31         case PM_256M:   return "256Mb";
  32 #endif
  33         }
  34
  35         return "unknown";
  36 }
  37
  38 #define BARRIER()                                       \
  39         __asm__ __volatile__(                           \
  40                 ".set\tnoreorder\n\t"                   \
  41                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  42                 ".set\treorder");
  43
  44 void dump_tlb(int first, int last)
  45 {
  46         unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
  47         unsigned int s_index, pagemask, c0, c1, i;
  48
  49         s_entryhi = read_c0_entryhi();
  50         s_index = read_c0_index();
  51         asid = s_entryhi & 0xff;
  52
  53         for (i = first; i <= last; i++) {
  54                 write_c0_index(i);
  55                 BARRIER();
  56                 tlb_read();
  57                 BARRIER();
  58                 pagemask = read_c0_pagemask();
  59                 entryhi  = read_c0_entryhi();
  60                 entrylo0 = read_c0_entrylo0();
  61                 entrylo1 = read_c0_entrylo1();
  62
  63                 /* Unused entries have a virtual address of CKSEG0.  */
  64                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  65                     && (entryhi & 0xff) == asid) {
  66                         /*
  67                          * Only print entries in use
  68                          */
  69                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  70
  71                         c0 = (entrylo0 >> 3) & 7;
  72                         c1 = (entrylo1 >> 3) & 7;
  73
  74                         printk("va=%011lx asid=%02lx\n",
  75                                (entryhi & ~0x1fffUL),
  76                                entryhi & 0xff);
  77                         printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ",
  78                                (entrylo0 << 6) & PAGE_MASK, c0,
  79                                (entrylo0 & 4) ? 1 : 0,
  80                                (entrylo0 & 2) ? 1 : 0,
  81                                (entrylo0 & 1));
  82                         printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n",
  83                                (entrylo1 << 6) & PAGE_MASK, c1,
  84                                (entrylo1 & 4) ? 1 : 0,
  85                                (entrylo1 & 2) ? 1 : 0,
  86                                (entrylo1 & 1));
  87                 }
  88         }
  89         printk("\n");
  90
  91         write_c0_entryhi(s_entryhi);
  92         write_c0_index(s_index);
  93 }
  94
  95 void dump_tlb_all(void)
  96 {
  97         dump_tlb(0, current_cpu_data.tlbsize - 1);
  98 }
  99
 100 void dump_tlb_wired(void)
 101 {
 102         int     wired;
 103
 104         wired = read_c0_wired();
 105         printk("Wired: %d", wired);
 106         dump_tlb(0, read_c0_wired());
 107 }
 108
 109 void dump_tlb_addr(unsigned long addr)
 110 {
 111         unsigned int flags, oldpid;
 112         int index;
 113
 114         local_irq_save(flags);
 115         oldpid = read_c0_entryhi() & 0xff;
 116         BARRIER();
 117         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 118         BARRIER();
 119         tlb_probe();
 120         BARRIER();
 121         index = read_c0_index();
 122         write_c0_entryhi(oldpid);
 123         local_irq_restore(flags);
 124
 125         if (index < 0) {
 126                 printk("No entry for address 0x%08lx in TLB\n", addr);
 127                 return;
 128         }
 129
 130         printk("Entry %d maps address 0x%08lx\n", index, addr);
 131         dump_tlb(index, index);
 132 }
 133
 134 void dump_tlb_nonwired(void)
 135 {
 136         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 137 }
 138
 139 void dump_list_process(struct task_struct *t, void *address)
 140 {
 141         pgd_t   *page_dir, *pgd;
 142         pud_t   *pud;
 143         pmd_t   *pmd;
 144         pte_t   *pte, page;
 145         unsigned long addr, val;
 146
 147         addr = (unsigned long) address;
 148
 149         printk("Addr                 == %08lx\n", addr);
 150         printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
 151
 152         page_dir = pgd_offset(t->mm, 0UL);
 153         printk("page_dir == %016lx\n", (unsigned long) page_dir);
 154
 155         pgd = pgd_offset(t->mm, addr);
 156         printk("pgd == %016lx\n", (unsigned long) pgd);
 157
 158         pud = pud_offset(pgd, addr);
 159         printk("pud == %016lx\n", (unsigned long) pud);
 160
 161         pmd = pmd_offset(pud, addr);
 162         printk("pmd == %016lx\n", (unsigned long) pmd);
 163
 164         pte = pte_offset(pmd, addr);
 165         printk("pte == %016lx\n", (unsigned long) pte);
 166
 167         page = *pte;
 168         printk("page == %08lx\n", pte_val(page));
 169
 170         val = pte_val(page);
 171         if (val & _PAGE_PRESENT) printk("present ");
 172         if (val & _PAGE_READ) printk("read ");
 173         if (val & _PAGE_WRITE) printk("write ");
 174         if (val & _PAGE_ACCESSED) printk("accessed ");
 175         if (val & _PAGE_MODIFIED) printk("modified ");
 176         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 177         if (val & _PAGE_GLOBAL) printk("global ");
 178         if (val & _PAGE_VALID) printk("valid ");
 179         printk("\n");
 180 }
 181
 182 void dump_list_current(void *address)
 183 {
 184         dump_list_process(current, address);
 185 }
 186
 187 unsigned long vtop(void *address)
 188 {
 189         pgd_t   *pgd;
 190         pud_t   *pud;
 191         pmd_t   *pmd;
 192         pte_t   *pte;
 193         unsigned long addr, paddr;
 194
 195         addr = (unsigned long) address;
 196         pgd = pgd_offset(current->mm, addr);
 197         pud = pud_offset(pgd, addr);
 198         pmd = pmd_offset(pud, addr);
 199         pte = pte_offset(pmd, addr);
 200         paddr = (CKSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 201         paddr |= (addr & ~PAGE_MASK);
 202
 203         return paddr;
 204 }
 205
 206 void dump16(unsigned long *p)
 207 {
 208         int i;
 209
 210         for (i = 0; i < 8; i++) {
 211                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 212                 p++;
 213                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 214                 p++;
 215         }
 216 }