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/hazards.h>
  11 #include <asm/mipsregs.h>
  12 #include <asm/page.h>
  13 #include <asm/pgtable.h>
  14 #include <asm/tlbdebug.h>
  15
  16 static inline const char *msk2str(unsigned int mask)
  17 {
  18         switch (mask) {
  19         case PM_4K:     return "4kb";
  20         case PM_16K:    return "16kb";
  21         case PM_64K:    return "64kb";
  22         case PM_256K:   return "256kb";
  23 #ifdef CONFIG_CPU_CAVIUM_OCTEON
  24         case PM_8K:     return "8kb";
  25         case PM_32K:    return "32kb";
  26         case PM_128K:   return "128kb";
  27         case PM_512K:   return "512kb";
  28         case PM_2M:     return "2Mb";
  29         case PM_8M:     return "8Mb";
  30         case PM_32M:    return "32Mb";
  31 #endif
  32 #ifndef CONFIG_CPU_VR41XX
  33         case PM_1M:     return "1Mb";
  34         case PM_4M:     return "4Mb";
  35         case PM_16M:    return "16Mb";
  36         case PM_64M:    return "64Mb";
  37         case PM_256M:   return "256Mb";
  38         case PM_1G:     return "1Gb";
  39 #endif
  40         }
  41         return "";
  42 }
  43
  44 static void dump_tlb(int first, int last)
  45 {
  46         unsigned long s_entryhi, entryhi, asid;
  47         unsigned long long entrylo0, entrylo1;
  48         unsigned int s_index, s_pagemask, pagemask, c0, c1, i;
  49
  50         s_pagemask = read_c0_pagemask();
  51         s_entryhi = read_c0_entryhi();
  52         s_index = read_c0_index();
  53         asid = s_entryhi & 0xff;
  54
  55         for (i = first; i <= last; i++) {
  56                 write_c0_index(i);
  57                 mtc0_tlbr_hazard();
  58                 tlb_read();
  59                 tlb_read_hazard();
  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 of CKSEG0.  */
  66                 if ((entryhi & ~0x1ffffUL) != CKSEG0
  67                     && (entryhi & 0xff) == asid) {
  68 #ifdef CONFIG_32BIT
  69                         int width = 8;
  70 #else
  71                         int width = 11;
  72 #endif
  73                         /*
  74                          * Only print entries in use
  75                          */
  76                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  77
  78                         c0 = (entrylo0 >> 3) & 7;
  79                         c1 = (entrylo1 >> 3) & 7;
  80
  81                         printk("va=%0*lx asid=%02lx\n",
  82                                width, (entryhi & ~0x1fffUL),
  83                                entryhi & 0xff);
  84                         printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
  85                                width,
  86                                (entrylo0 << 6) & PAGE_MASK, c0,
  87                                (entrylo0 & 4) ? 1 : 0,
  88                                (entrylo0 & 2) ? 1 : 0,
  89                                (entrylo0 & 1) ? 1 : 0);
  90                         printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
  91                                width,
  92                                (entrylo1 << 6) & PAGE_MASK, c1,
  93                                (entrylo1 & 4) ? 1 : 0,
  94                                (entrylo1 & 2) ? 1 : 0,
  95                                (entrylo1 & 1) ? 1 : 0);
  96                 }
  97         }
  98         printk("\n");
  99
 100         write_c0_entryhi(s_entryhi);
 101         write_c0_index(s_index);
 102         write_c0_pagemask(s_pagemask);
 103 }
 104
 105 void dump_tlb_all(void)
 106 {
 107         dump_tlb(0, current_cpu_data.tlbsize - 1);
 108 }