arch/mips/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/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 void dump_tlb(int first, int last)
  38 {
  39         unsigned int pagemask, c0, c1, asid;
  40         unsigned long long entrylo0, entrylo1;
  41         unsigned long entryhi;
  42         int     i;
  43
  44         asid = read_c0_entryhi() & 0xff;
  45
  46         printk("\n");
  47         for (i = first; i <= last; i++) {
  48                 write_c0_index(i);
  49                 __asm__ __volatile__(
  50                         ".set\tmips3\n\t"
  51                         ".set\tnoreorder\n\t"
  52                         "nop;nop;nop;nop\n\t"
  53                         "tlbr\n\t"
  54                         "nop;nop;nop;nop\n\t"
  55                         ".set\treorder\n\t"
  56                         ".set\tmips0\n\t");
  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 in KSEG0.  */
  63                 if ((entryhi & 0xf0000000) != 0x80000000
  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=%08lx asid=%02lx\n",
  74                                (entryhi & 0xffffe000), (entryhi & 0xff));
  75                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  76                                (entrylo0 << 6) & PAGE_MASK, c0,
  77                                (entrylo0 & 4) ? 1 : 0,
  78                                (entrylo0 & 2) ? 1 : 0,
  79                                (entrylo0 & 1));
  80                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  81                                (entrylo1 << 6) & PAGE_MASK, c1,
  82                                (entrylo1 & 4) ? 1 : 0,
  83                                (entrylo1 & 2) ? 1 : 0,
  84                                (entrylo1 & 1));
  85                         printk("\n");
  86                 }
  87         }
  88
  89         write_c0_entryhi(asid);
  90 }
  91
  92 void dump_tlb_all(void)
  93 {
  94         dump_tlb(0, current_cpu_data.tlbsize - 1);
  95 }
  96
  97 void dump_tlb_wired(void)
  98 {
  99         int     wired;
 100
 101         wired = read_c0_wired();
 102         printk("Wired: %d", wired);
 103         dump_tlb(0, read_c0_wired());
 104 }
 105
 106 #define BARRIER                                         \
 107         __asm__ __volatile__(                           \
 108                 ".set\tnoreorder\n\t"                   \
 109                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
 110                 ".set\treorder");
 111
 112 void dump_tlb_addr(unsigned long addr)
 113 {
 114         unsigned long flags, oldpid;
 115         int index;
 116
 117         local_irq_save(flags);
 118         oldpid = read_c0_entryhi() & 0xff;
 119         BARRIER;
 120         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 121         BARRIER;
 122         tlb_probe();
 123         BARRIER;
 124         index = read_c0_index();
 125         write_c0_entryhi(oldpid);
 126         local_irq_restore(flags);
 127
 128         if (index < 0) {
 129                 printk("No entry for address 0x%08lx in TLB\n", addr);
 130                 return;
 131         }
 132
 133         printk("Entry %d maps address 0x%08lx\n", index, addr);
 134         dump_tlb(index, index);
 135 }
 136
 137 void dump_tlb_nonwired(void)
 138 {
 139         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 140 }
 141
 142 void dump_list_process(struct task_struct *t, void *address)
 143 {
 144         pgd_t   *page_dir, *pgd;
 145         pmd_t   *pmd;
 146         pte_t   *pte, page;
 147         unsigned int addr;
 148         unsigned long val;
 149
 150         addr = (unsigned int) address;
 151
 152         printk("Addr                 == %08x\n", addr);
 153         printk("task                 == %8p\n", t);
 154         printk("task->mm             == %8p\n", t->mm);
 155         //printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 156
 157         if (addr > KSEG0)
 158                 page_dir = pgd_offset_k(0);
 159         else
 160                 page_dir = pgd_offset(t->mm, 0);
 161         printk("page_dir == %08x\n", (unsigned int) page_dir);
 162
 163         if (addr > KSEG0)
 164                 pgd = pgd_offset_k(addr);
 165         else
 166                 pgd = pgd_offset(t->mm, addr);
 167         printk("pgd == %08x, ", (unsigned int) pgd);
 168
 169         pmd = pmd_offset(pgd, addr);
 170         printk("pmd == %08x, ", (unsigned int) pmd);
 171
 172         pte = pte_offset(pmd, addr);
 173         printk("pte == %08x, ", (unsigned int) pte);
 174
 175         page = *pte;
 176 #ifdef CONFIG_64BIT_PHYS_ADDR
 177         printk("page == %08Lx\n", pte_val(page));
 178 #else
 179         printk("page == %08lx\n", pte_val(page));
 180 #endif
 181
 182         val = pte_val(page);
 183         if (val & _PAGE_PRESENT) printk("present ");
 184         if (val & _PAGE_READ) printk("read ");
 185         if (val & _PAGE_WRITE) printk("write ");
 186         if (val & _PAGE_ACCESSED) printk("accessed ");
 187         if (val & _PAGE_MODIFIED) printk("modified ");
 188         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 189         if (val & _PAGE_GLOBAL) printk("global ");
 190         if (val & _PAGE_VALID) printk("valid ");
 191         printk("\n");
 192 }
 193
 194 void dump_list_current(void *address)
 195 {
 196         dump_list_process(current, address);
 197 }
 198
 199 unsigned int vtop(void *address)
 200 {
 201         pgd_t   *pgd;
 202         pmd_t   *pmd;
 203         pte_t   *pte;
 204         unsigned int addr, paddr;
 205
 206         addr = (unsigned long) address;
 207         pgd = pgd_offset(current->mm, addr);
 208         pmd = pmd_offset(pgd, addr);
 209         pte = pte_offset(pmd, addr);
 210         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 211         paddr |= (addr & ~PAGE_MASK);
 212
 213         return paddr;
 214 }
 215
 216 void dump16(unsigned long *p)
 217 {
 218         int i;
 219
 220         for (i = 0; i < 8; i++) {
 221                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 222                 p++;
 223                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 224                 p++;
 225         }
 226 }