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/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         return "";
  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 long s_entryhi, entryhi, asid;
  46         unsigned long long entrylo0, entrylo1;
  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 #ifdef CONFIG_32BIT
  67                         int width = 8;
  68 #else
  69                         int width = 11;
  70 #endif
  71                         /*
  72                          * Only print entries in use
  73                          */
  74                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  75
  76                         c0 = (entrylo0 >> 3) & 7;
  77                         c1 = (entrylo1 >> 3) & 7;
  78
  79                         printk("va=%0*lx asid=%02lx\n",
  80                                width, (entryhi & ~0x1fffUL),
  81                                entryhi & 0xff);
  82                         printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
  83                                width,
  84                                (entrylo0 << 6) & PAGE_MASK, c0,
  85                                (entrylo0 & 4) ? 1 : 0,
  86                                (entrylo0 & 2) ? 1 : 0,
  87                                (entrylo0 & 1) ? 1 : 0);
  88                         printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
  89                                width,
  90                                (entrylo1 << 6) & PAGE_MASK, c1,
  91                                (entrylo1 & 4) ? 1 : 0,
  92                                (entrylo1 & 2) ? 1 : 0,
  93                                (entrylo1 & 1) ? 1 : 0);
  94                 }
  95         }
  96         printk("\n");
  97
  98         write_c0_entryhi(s_entryhi);
  99         write_c0_index(s_index);
 100 }
 101
 102 void dump_tlb_all(void)
 103 {
 104         dump_tlb(0, current_cpu_data.tlbsize - 1);
 105 }
 106
 107 void dump_tlb_wired(void)
 108 {
 109         int     wired;
 110
 111         wired = read_c0_wired();
 112         printk("Wired: %d", wired);
 113         dump_tlb(0, read_c0_wired());
 114 }
 115
 116 void dump_tlb_addr(unsigned long addr)
 117 {
 118         unsigned int flags, oldpid;
 119         int index;
 120
 121         local_irq_save(flags);
 122         oldpid = read_c0_entryhi() & 0xff;
 123         BARRIER();
 124         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 125         BARRIER();
 126         tlb_probe();
 127         BARRIER();
 128         index = read_c0_index();
 129         write_c0_entryhi(oldpid);
 130         local_irq_restore(flags);
 131
 132         if (index < 0) {
 133                 printk("No entry for address 0x%08lx in TLB\n", addr);
 134                 return;
 135         }
 136
 137         printk("Entry %d maps address 0x%08lx\n", index, addr);
 138         dump_tlb(index, index);
 139 }
 140
 141 void dump_tlb_nonwired(void)
 142 {
 143         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 144 }
 145
 146 void dump_list_process(struct task_struct *t, void *address)
 147 {
 148         pgd_t   *page_dir, *pgd;
 149         pud_t   *pud;
 150         pmd_t   *pmd;
 151         pte_t   *pte, page;
 152         unsigned long addr, val;
 153         int width = sizeof(long) * 2;
 154
 155         addr = (unsigned long) address;
 156
 157         printk("Addr                 == %08lx\n", addr);
 158 #ifdef CONFIG_64BIT
 159         printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
 160 #endif
 161
 162 #ifdef CONFIG_64BIT
 163         page_dir = pgd_offset(t->mm, 0UL);
 164         pgd = pgd_offset(t->mm, addr);
 165 #else
 166         if (addr > KSEG0) {
 167                 page_dir = pgd_offset_k(0);
 168                 pgd = pgd_offset_k(addr);
 169         } else if (t->mm) {
 170                 page_dir = pgd_offset(t->mm, 0);
 171                 pgd = pgd_offset(t->mm, addr);
 172         } else {
 173                 printk("Current thread has no mm\n");
 174                 return;
 175         }
 176 #endif
 177         printk("page_dir == %0*lx\n", width, (unsigned long) page_dir);
 178         printk("pgd == %0*lx\n", width, (unsigned long) pgd);
 179
 180         pud = pud_offset(pgd, addr);
 181         printk("pud == %0*lx\n", width, (unsigned long) pud);
 182
 183         pmd = pmd_offset(pud, addr);
 184         printk("pmd == %0*lx\n", width, (unsigned long) pmd);
 185
 186         pte = pte_offset(pmd, addr);
 187         printk("pte == %0*lx\n", width, (unsigned long) pte);
 188
 189         page = *pte;
 190 #ifdef CONFIG_64BIT_PHYS_ADDR
 191         printk("page == %08Lx\n", pte_val(page));
 192 #else
 193         printk("page == %0*lx\n", width, pte_val(page));
 194 #endif
 195
 196         val = pte_val(page);
 197         if (val & _PAGE_PRESENT) printk("present ");
 198         if (val & _PAGE_READ) printk("read ");
 199         if (val & _PAGE_WRITE) printk("write ");
 200         if (val & _PAGE_ACCESSED) printk("accessed ");
 201         if (val & _PAGE_MODIFIED) printk("modified ");
 202         if (val & _PAGE_R4KBUG) printk("r4kbug ");
 203         if (val & _PAGE_GLOBAL) printk("global ");
 204         if (val & _PAGE_VALID) printk("valid ");
 205         printk("\n");
 206 }
 207
 208 void dump_list_current(void *address)
 209 {
 210         dump_list_process(current, address);
 211 }
 212
 213 unsigned long vtop(void *address)
 214 {
 215         pgd_t   *pgd;
 216         pud_t   *pud;
 217         pmd_t   *pmd;
 218         pte_t   *pte;
 219         unsigned long addr, paddr;
 220
 221         addr = (unsigned long) address;
 222         pgd = pgd_offset(current->mm, addr);
 223         pud = pud_offset(pgd, addr);
 224         pmd = pmd_offset(pud, addr);
 225         pte = pte_offset(pmd, addr);
 226         paddr = (CKSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 227         paddr |= (addr & ~PAGE_MASK);
 228
 229         return paddr;
 230 }
 231
 232 void dump16(unsigned long *p)
 233 {
 234         int i;
 235
 236         for (i = 0; i < 8; i++) {
 237                 printk("*%08lx == %08lx, ", (unsigned long)p, *p);
 238                 p++;
 239                 printk("*%08lx == %08lx\n", (unsigned long)p, *p);
 240                 p++;
 241         }
 242 }