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 extern int r3k_have_wired_reg;
18
dump_tlb_regs(void)19 void 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
dump_tlb(int first,int last)28 static 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(¤t_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
dump_tlb_all(void)72 void dump_tlb_all(void)
73 {
74 dump_tlb(0, current_cpu_data.tlbsize - 1);
75 }
76