arch/mips/lib-32/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 int pagemask, c0, c1, asid;
  46         unsigned long long entrylo0, entrylo1;
  47         unsigned long entryhi;
  48         int     i;
  49
  50         asid = read_c0_entryhi() & 0xff;
  51
  52         printk("\n");
  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 in KSEG0.  */
  64                 if ((entryhi & 0xf0000000) != 0x80000000
  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=%08lx asid=%02lx\n",
  75                                (entryhi & 0xffffe000), (entryhi & 0xff));
  76                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  77                                (entrylo0 << 6) & PAGE_MASK, c0,
  78                                (entrylo0 & 4) ? 1 : 0,
  79                                (entrylo0 & 2) ? 1 : 0,
  80                                (entrylo0 & 1));
  81                         printk("\t\t\t[pa=%08Lx 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                         printk("\n");
  87                 }
  88         }
  89
  90         write_c0_entryhi(asid);
  91 }
  92
  93 void dump_tlb_all(void)
  94 {
  95         dump_tlb(0, current_cpu_data.tlbsize - 1);
  96 }
  97
  98 void dump_tlb_wired(void)
  99 {
 100         int     wired;
 101
 102         wired = read_c0_wired();
 103         printk("Wired: %d", wired);
 104         dump_tlb(0, read_c0_wired());
 105 }
 106
 107 void dump_tlb_addr(unsigned long addr)
 108 {
 109         unsigned int flags, oldpid;
 110         int index;
 111
 112         local_irq_save(flags);
 113         oldpid = read_c0_entryhi() & 0xff;
 114         BARRIER();
 115         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 116         BARRIER();
 117         tlb_probe();
 118         BARRIER();
 119         index = read_c0_index();
 120         write_c0_entryhi(oldpid);
 121         local_irq_restore(flags);
 122
 123         if (index < 0) {
 124                 printk("No entry for address 0x%08lx in TLB\n", addr);
 125                 return;
 126         }
 127
 128         printk("Entry %d maps address 0x%08lx\n", index, addr);
 129         dump_tlb(index, index);
 130 }
 131
 132 void dump_tlb_nonwired(void)
 133 {
 134         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 135 }
 136
 137 void dump_list_process(struct task_struct *t, void *address)
 138 {
 139         pgd_t   *page_dir, *pgd;
 140         pmd_t   *pmd;
 141         pte_t   *pte, page;
 142         unsigned long addr, val;
 143
 144         addr = (unsigned long) address;
 145
 146         printk("Addr                 == %08lx\n", addr);
 147         printk("task                 == %8p\n", t);
 148         printk("task->mm             == %8p\n", t->mm);
 149         //printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 150
 151         if (addr > KSEG0)
 152                 page_dir = pgd_offset_k(0);
 153         else
 154                 page_dir = pgd_offset(t->mm, 0);
 155         printk("page_dir == %08x\n", (unsigned int) page_dir);
 156
 157         if (addr > KSEG0)
 158                 pgd = pgd_offset_k(addr);
 159         else
 160                 pgd = pgd_offset(t->mm, addr);
 161         printk("pgd == %08x, ", (unsigned int) pgd);
 162
 163         pmd = pmd_offset(pgd, addr);
 164         printk("pmd == %08x, ", (unsigned int) pmd);
 165
 166         pte = pte_offset(pmd, addr);
 167         printk("pte == %08x, ", (unsigned int) pte);
 168
 169         page = *pte;
 170 #ifdef CONFIG_64BIT_PHYS_ADDR
 171         printk("page == %08Lx\n", pte_val(page));
 172 #else
 173         printk("page == %08lx\n", pte_val(page));
 174 #endif
 175
 176         val = pte_val(page);
 177         if (val & _PAGE_PRESENT) printk("present ");
 178         if (val & _PAGE_READ) printk("read ");
 179         if (val & _PAGE_WRITE) printk("write ");
 180         if (val & _PAGE_ACCESSED) printk("accessed ");
 181         if (val & _PAGE_MODIFIED) printk("modified ");
 182         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 183         if (val & _PAGE_GLOBAL) printk("global ");
 184         if (val & _PAGE_VALID) printk("valid ");
 185         printk("\n");
 186 }
 187
 188 void dump_list_current(void *address)
 189 {
 190         dump_list_process(current, address);
 191 }
 192
 193 unsigned int vtop(void *address)
 194 {
 195         pgd_t   *pgd;
 196         pmd_t   *pmd;
 197         pte_t   *pte;
 198         unsigned int addr, paddr;
 199
 200         addr = (unsigned long) address;
 201         pgd = pgd_offset(current->mm, addr);
 202         pmd = pmd_offset(pgd, addr);
 203         pte = pte_offset(pmd, addr);
 204         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 205         paddr |= (addr & ~PAGE_MASK);
 206
 207         return paddr;
 208 }
 209
 210 void dump16(unsigned long *p)
 211 {
 212         int i;
 213
 214         for (i = 0; i < 8; i++) {
 215                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 216                 p++;
 217                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 218                 p++;
 219         }
 220 }