arch/mips/lib/r3k_dump_tlb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Dump R3000 TLB for debugging purposes.
   4  *
   5  * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
   6  * Copyright (C) 1999 by Silicon Graphics, Inc.
   7  * Copyright (C) 1999 by Harald Koerfgen
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11
  12 #include <asm/mipsregs.h>
  13 #include <asm/mmu_context.h>
  14 #include <asm/page.h>
  15 #include <asm/tlbdebug.h>
  16
  17 void dump_tlb_regs(void)
  18 {
  19         pr_info("Index    : %0x\n", read_c0_index());
  20         pr_info("EntryHi  : %0lx\n", read_c0_entryhi());
  21         pr_info("EntryLo  : %0lx\n", read_c0_entrylo0());
  22 }
  23
  24 static void dump_tlb(int first, int last)
  25 {
  26         int     i;
  27         unsigned int asid;
  28         unsigned long entryhi, entrylo0, asid_mask;
  29
  30         asid_mask = cpu_asid_mask(&current_cpu_data);
  31         asid = read_c0_entryhi() & asid_mask;
  32
  33         for (i = first; i <= last; i++) {
  34                 write_c0_index(i<<8);
  35                 __asm__ __volatile__(
  36                         ".set\tnoreorder\n\t"
  37                         "tlbr\n\t"
  38                         "nop\n\t"
  39                         ".set\treorder");
  40                 entryhi  = read_c0_entryhi();
  41                 entrylo0 = read_c0_entrylo0();
  42
  43                 /* Unused entries have a virtual address of KSEG0.  */
  44                 if ((entryhi & PAGE_MASK) != KSEG0 &&
  45                     (entrylo0 & R3K_ENTRYLO_G ||
  46                      (entryhi & asid_mask) == asid)) {
  47                         /*
  48                          * Only print entries in use
  49                          */
  50                         printk("Index: %2d ", i);
  51
  52                         pr_cont("va=%08lx asid=%08lx"
  53                                 "  [pa=%06lx n=%d d=%d v=%d g=%d]",
  54                                 entryhi & PAGE_MASK,
  55                                 entryhi & asid_mask,
  56                                 entrylo0 & PAGE_MASK,
  57                                 (entrylo0 & R3K_ENTRYLO_N) ? 1 : 0,
  58                                 (entrylo0 & R3K_ENTRYLO_D) ? 1 : 0,
  59                                 (entrylo0 & R3K_ENTRYLO_V) ? 1 : 0,
  60                                 (entrylo0 & R3K_ENTRYLO_G) ? 1 : 0);
  61                 }
  62         }
  63         printk("\n");
  64
  65         write_c0_entryhi(asid);
  66 }
  67
  68 void dump_tlb_all(void)
  69 {
  70         dump_tlb(0, current_cpu_data.tlbsize - 1);
  71 }