LXR linux/arch/mips/lib/r3k_dump

   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
  17void 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
  24static 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
  68void dump_tlb_all(void)
  69{
  70        dump_tlb(0, current_cpu_data.tlbsize - 1);
  71}
  72