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
  17extern int r3k_have_wired_reg;
  18
  19void dump_tlb_regs(void)
  20{
  21        pr_info("Index    : %0x\n", read_c0_index());
  22        pr_info("EntryHi  : %0lx\n", read_c0_entryhi());
  23        pr_info("EntryLo  : %0lx\n", read_c0_entrylo0());
  24        if (r3k_have_wired_reg)
  25                pr_info("Wired    : %0x\n", read_c0_wired());
  26}
  27
  28static void dump_tlb(int first, int last)
  29{
  30        int     i;
  31        unsigned int asid;
  32        unsigned long entryhi, entrylo0, asid_mask;
  33
  34        asid_mask = cpu_asid_mask(&current_cpu_data);
  35        asid = read_c0_entryhi() & asid_mask;
  36
  37        for (i = first; i <= last; i++) {
  38                write_c0_index(i<<8);
  39                __asm__ __volatile__(
  40                        ".set\tnoreorder\n\t"
  41                        "tlbr\n\t"
  42                        "nop\n\t"
  43                        ".set\treorder");
  44                entryhi  = read_c0_entryhi();
  45                entrylo0 = read_c0_entrylo0();
  46
  47                /* Unused entries have a virtual address of KSEG0.  */
  48                if ((entryhi & PAGE_MASK) != KSEG0 &&
  49                    (entrylo0 & R3K_ENTRYLO_G ||
  50                     (entryhi & asid_mask) == asid)) {
  51                        /*
  52                         * Only print entries in use
  53                         */
  54                        printk("Index: %2d ", i);
  55
  56                        pr_cont("va=%08lx asid=%08lx"
  57                                "  [pa=%06lx n=%d d=%d v=%d g=%d]",
  58                                entryhi & PAGE_MASK,
  59                                entryhi & asid_mask,
  60                                entrylo0 & PAGE_MASK,
  61                                (entrylo0 & R3K_ENTRYLO_N) ? 1 : 0,
  62                                (entrylo0 & R3K_ENTRYLO_D) ? 1 : 0,
  63                                (entrylo0 & R3K_ENTRYLO_V) ? 1 : 0,
  64                                (entrylo0 & R3K_ENTRYLO_G) ? 1 : 0);
  65                }
  66        }
  67        printk("\n");
  68
  69        write_c0_entryhi(asid);
  70}
  71
  72void dump_tlb_all(void)
  73{
  74        dump_tlb(0, current_cpu_data.tlbsize - 1);
  75}
  76