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