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
  10 #include <asm/mipsregs.h>
  11 #include <asm/page.h>
  12 #include <asm/pgtable.h>
  13 #include <asm/tlbdebug.h>
  14
  15 static inline const char *msk2str(unsigned int mask)
  16 {
  17         switch (mask) {
  18         case PM_4K:     return "4kb";
  19         case PM_16K:    return "16kb";
  20         case PM_64K:    return "64kb";
  21         case PM_256K:   return "256kb";
  22 #ifndef CONFIG_CPU_VR41XX
  23         case PM_1M:     return "1Mb";
  24         case PM_4M:     return "4Mb";
  25         case PM_16M:    return "16Mb";
  26         case PM_64M:    return "64Mb";
  27         case PM_256M:   return "256Mb";
  28         case PM_1G:     return "1Gb";
  29 #endif
  30         }
  31         return "";
  32 }
  33
  34 #define BARRIER()                                       \
  35         __asm__ __volatile__(                           \
  36                 ".set\tnoreorder\n\t"                   \
  37                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  38                 ".set\treorder");
  39
  40 static void dump_tlb(int first, int last)
  41 {
  42         unsigned long s_entryhi, entryhi, asid;
  43         unsigned long long entrylo0, entrylo1;
  44         unsigned int s_index, pagemask, c0, c1, i;
  45
  46         s_entryhi = read_c0_entryhi();
  47         s_index = read_c0_index();
  48         asid = s_entryhi & 0xff;
  49
  50         for (i = first; i <= last; i++) {
  51                 write_c0_index(i);
  52                 BARRIER();
  53                 tlb_read();
  54                 BARRIER();
  55                 pagemask = read_c0_pagemask();
  56                 entryhi  = read_c0_entryhi();
  57                 entrylo0 = read_c0_entrylo0();
  58                 entrylo1 = read_c0_entrylo1();
  59
  60                 /* Unused entries have a virtual address of CKSEG0.  */
  61                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  62                     && (entryhi & 0xff) == asid) {
  63 #ifdef CONFIG_32BIT
  64                         int width = 8;
  65 #else
  66                         int width = 11;
  67 #endif
  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=%0*lx asid=%02lx\n",
  77                                width, (entryhi & ~0x1fffUL),
  78                                entryhi & 0xff);
  79                         printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
  80                                width,
  81                                (entrylo0 << 6) & PAGE_MASK, c0,
  82                                (entrylo0 & 4) ? 1 : 0,
  83                                (entrylo0 & 2) ? 1 : 0,
  84                                (entrylo0 & 1) ? 1 : 0);
  85                         printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
  86                                width,
  87                                (entrylo1 << 6) & PAGE_MASK, c1,
  88                                (entrylo1 & 4) ? 1 : 0,
  89                                (entrylo1 & 2) ? 1 : 0,
  90                                (entrylo1 & 1) ? 1 : 0);
  91                 }
  92         }
  93         printk("\n");
  94
  95         write_c0_entryhi(s_entryhi);
  96         write_c0_index(s_index);
  97 }
  98
  99 void dump_tlb_all(void)
 100 {
 101         dump_tlb(0, current_cpu_data.tlbsize - 1);
 102 }