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 #ifdef CONFIG_CPU_CAVIUM_OCTEON
  23         case PM_8K:     return "8kb";
  24         case PM_32K:    return "32kb";
  25         case PM_128K:   return "128kb";
  26         case PM_512K:   return "512kb";
  27         case PM_2M:     return "2Mb";
  28         case PM_8M:     return "8Mb";
  29         case PM_32M:    return "32Mb";
  30 #endif
  31 #ifndef CONFIG_CPU_VR41XX
  32         case PM_1M:     return "1Mb";
  33         case PM_4M:     return "4Mb";
  34         case PM_16M:    return "16Mb";
  35         case PM_64M:    return "64Mb";
  36         case PM_256M:   return "256Mb";
  37         case PM_1G:     return "1Gb";
  38 #endif
  39         }
  40         return "";
  41 }
  42
  43 #define BARRIER()                                       \
  44         __asm__ __volatile__(                           \
  45                 ".set\tnoreorder\n\t"                   \
  46                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  47                 ".set\treorder");
  48
  49 static void dump_tlb(int first, int last)
  50 {
  51         unsigned long s_entryhi, entryhi, asid;
  52         unsigned long long entrylo0, entrylo1;
  53         unsigned int s_index, pagemask, c0, c1, i;
  54
  55         s_entryhi = read_c0_entryhi();
  56         s_index = read_c0_index();
  57         asid = s_entryhi & 0xff;
  58
  59         for (i = first; i <= last; i++) {
  60                 write_c0_index(i);
  61                 BARRIER();
  62                 tlb_read();
  63                 BARRIER();
  64                 pagemask = read_c0_pagemask();
  65                 entryhi  = read_c0_entryhi();
  66                 entrylo0 = read_c0_entrylo0();
  67                 entrylo1 = read_c0_entrylo1();
  68
  69                 /* Unused entries have a virtual address of CKSEG0.  */
  70                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  71                     && (entryhi & 0xff) == asid) {
  72 #ifdef CONFIG_32BIT
  73                         int width = 8;
  74 #else
  75                         int width = 11;
  76 #endif
  77                         /*
  78                          * Only print entries in use
  79                          */
  80                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  81
  82                         c0 = (entrylo0 >> 3) & 7;
  83                         c1 = (entrylo1 >> 3) & 7;
  84
  85                         printk("va=%0*lx asid=%02lx\n",
  86                                width, (entryhi & ~0x1fffUL),
  87                                entryhi & 0xff);
  88                         printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
  89                                width,
  90                                (entrylo0 << 6) & PAGE_MASK, c0,
  91                                (entrylo0 & 4) ? 1 : 0,
  92                                (entrylo0 & 2) ? 1 : 0,
  93                                (entrylo0 & 1) ? 1 : 0);
  94                         printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
  95                                width,
  96                                (entrylo1 << 6) & PAGE_MASK, c1,
  97                                (entrylo1 & 4) ? 1 : 0,
  98                                (entrylo1 & 2) ? 1 : 0,
  99                                (entrylo1 & 1) ? 1 : 0);
 100                 }
 101         }
 102         printk("\n");
 103
 104         write_c0_entryhi(s_entryhi);
 105         write_c0_index(s_index);
 106 }
 107
 108 void dump_tlb_all(void)
 109 {
 110         dump_tlb(0, current_cpu_data.tlbsize - 1);
 111 }