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