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(first: 0, last: current_cpu_data.tlbsize - 1);
71}
72

source code of linux/arch/mips/lib/r3k_dump_tlb.c