arch/mips/lib/r3k_dump_tlb.c

   1 /*
   2  * Dump R3000 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  * Copyright (C) 1999 by Harald Koerfgen
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10
  11 #include <asm/mipsregs.h>
  12 #include <asm/page.h>
  13 #include <asm/pgtable.h>
  14 #include <asm/tlbdebug.h>
  15
  16 extern int r3k_have_wired_reg;  /* defined in tlb-r3k.c */
  17
  18 static void dump_tlb(int first, int last)
  19 {
  20         int     i;
  21         unsigned int asid;
  22         unsigned long entryhi, entrylo0;
  23
  24         asid = read_c0_entryhi() & 0xfc0;
  25
  26         for (i = first; i <= last; i++) {
  27                 write_c0_index(i<<8);
  28                 __asm__ __volatile__(
  29                         ".set\tnoreorder\n\t"
  30                         "tlbr\n\t"
  31                         "nop\n\t"
  32                         ".set\treorder");
  33                 entryhi  = read_c0_entryhi();
  34                 entrylo0 = read_c0_entrylo0();
  35
  36                 /* Unused entries have a virtual address of KSEG0.  */
  37                 if ((entryhi & 0xffffe000) != 0x80000000
  38                     && (entryhi & 0xfc0) == asid) {
  39                         /*
  40                          * Only print entries in use
  41                          */
  42                         printk("Index: %2d ", i);
  43
  44                         printk("va=%08lx asid=%08lx"
  45                                "  [pa=%06lx n=%d d=%d v=%d g=%d]",
  46                                (entryhi & 0xffffe000),
  47                                entryhi & 0xfc0,
  48                                entrylo0 & PAGE_MASK,
  49                                (entrylo0 & (1 << 11)) ? 1 : 0,
  50                                (entrylo0 & (1 << 10)) ? 1 : 0,
  51                                (entrylo0 & (1 << 9)) ? 1 : 0,
  52                                (entrylo0 & (1 << 8)) ? 1 : 0);
  53                 }
  54         }
  55         printk("\n");
  56
  57         write_c0_entryhi(asid);
  58 }
  59
  60 void dump_tlb_all(void)
  61 {
  62         dump_tlb(0, current_cpu_data.tlbsize - 1);
  63 }