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         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 int pagemask, c0, c1, asid;
  48         unsigned long long entrylo0, entrylo1;
  49         unsigned long entryhi;
  50         int     i;
  51
  52         asid = read_c0_entryhi() & 0xff;
  53
  54         printk("\n");
  55         for (i = first; i <= last; i++) {
  56                 write_c0_index(i);
  57                 BARRIER();
  58                 tlb_read();
  59                 BARRIER();
  60                 pagemask = read_c0_pagemask();
  61                 entryhi  = read_c0_entryhi();
  62                 entrylo0 = read_c0_entrylo0();
  63                 entrylo1 = read_c0_entrylo1();
  64
  65                 /* Unused entries have a virtual address in KSEG0.  */
  66                 if ((entryhi & 0xf0000000) != 0x80000000
  67                     && (entryhi & 0xff) == asid) {
  68                         /*
  69                          * Only print entries in use
  70                          */
  71                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  72
  73                         c0 = (entrylo0 >> 3) & 7;
  74                         c1 = (entrylo1 >> 3) & 7;
  75
  76                         printk("va=%08lx asid=%02lx\n",
  77                                (entryhi & 0xffffe000), (entryhi & 0xff));
  78                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  79                                (entrylo0 << 6) & PAGE_MASK, c0,
  80                                (entrylo0 & 4) ? 1 : 0,
  81                                (entrylo0 & 2) ? 1 : 0,
  82                                (entrylo0 & 1));
  83                         printk("\t\t\t[pa=%08Lx 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                         printk("\n");
  89                 }
  90         }
  91
  92         write_c0_entryhi(asid);
  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         pmd_t   *pmd;
 143         pte_t   *pte, page;
 144         unsigned long addr, val;
 145
 146         addr = (unsigned long) address;
 147
 148         printk("Addr                 == %08lx\n", addr);
 149         printk("task                 == %8p\n", t);
 150         printk("task->mm             == %8p\n", t->mm);
 151         //printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 152
 153         if (addr > KSEG0)
 154                 page_dir = pgd_offset_k(0);
 155         else
 156                 page_dir = pgd_offset(t->mm, 0);
 157         printk("page_dir == %08x\n", (unsigned int) page_dir);
 158
 159         if (addr > KSEG0)
 160                 pgd = pgd_offset_k(addr);
 161         else
 162                 pgd = pgd_offset(t->mm, addr);
 163         printk("pgd == %08x, ", (unsigned int) pgd);
 164
 165         pmd = pmd_offset(pgd, addr);
 166         printk("pmd == %08x, ", (unsigned int) pmd);
 167
 168         pte = pte_offset(pmd, addr);
 169         printk("pte == %08x, ", (unsigned int) pte);
 170
 171         page = *pte;
 172 #ifdef CONFIG_64BIT_PHYS_ADDR
 173         printk("page == %08Lx\n", pte_val(page));
 174 #else
 175         printk("page == %08lx\n", pte_val(page));
 176 #endif
 177
 178         val = pte_val(page);
 179         if (val & _PAGE_PRESENT) printk("present ");
 180         if (val & _PAGE_READ) printk("read ");
 181         if (val & _PAGE_WRITE) printk("write ");
 182         if (val & _PAGE_ACCESSED) printk("accessed ");
 183         if (val & _PAGE_MODIFIED) printk("modified ");
 184         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 185         if (val & _PAGE_GLOBAL) printk("global ");
 186         if (val & _PAGE_VALID) printk("valid ");
 187         printk("\n");
 188 }
 189
 190 void dump_list_current(void *address)
 191 {
 192         dump_list_process(current, address);
 193 }
 194
 195 unsigned int vtop(void *address)
 196 {
 197         pgd_t   *pgd;
 198         pmd_t   *pmd;
 199         pte_t   *pte;
 200         unsigned int addr, paddr;
 201
 202         addr = (unsigned long) address;
 203         pgd = pgd_offset(current->mm, addr);
 204         pmd = pmd_offset(pgd, addr);
 205         pte = pte_offset(pmd, addr);
 206         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 207         paddr |= (addr & ~PAGE_MASK);
 208
 209         return paddr;
 210 }
 211
 212 void dump16(unsigned long *p)
 213 {
 214         int i;
 215
 216         for (i = 0; i < 8; i++) {
 217                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 218                 p++;
 219                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 220                 p++;
 221         }
 222 }