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(&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 
dump_tlb_all(void)72 void dump_tlb_all(void)
73 {
74 	dump_tlb(0, current_cpu_data.tlbsize - 1);
75 }
76