xref: /openbmc/linux/arch/mips/lib/dump_tlb.c (revision 9ac8d3fb)
1 /*
2  * Dump R4x00 TLB for debugging purposes.
3  *
4  * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
5  * Copyright (C) 1999 by Silicon Graphics, Inc.
6  */
7 #include <linux/kernel.h>
8 #include <linux/mm.h>
9 
10 #include <asm/mipsregs.h>
11 #include <asm/page.h>
12 #include <asm/pgtable.h>
13 #include <asm/tlbdebug.h>
14 
15 static inline const char *msk2str(unsigned int mask)
16 {
17 	switch (mask) {
18 	case PM_4K:	return "4kb";
19 	case PM_16K:	return "16kb";
20 	case PM_64K:	return "64kb";
21 	case PM_256K:	return "256kb";
22 #ifndef CONFIG_CPU_VR41XX
23 	case PM_1M:	return "1Mb";
24 	case PM_4M:	return "4Mb";
25 	case PM_16M:	return "16Mb";
26 	case PM_64M:	return "64Mb";
27 	case PM_256M:	return "256Mb";
28 	case PM_1G:	return "1Gb";
29 #endif
30 	}
31 	return "";
32 }
33 
34 #define BARRIER()					\
35 	__asm__ __volatile__(				\
36 		".set\tnoreorder\n\t"			\
37 		"nop;nop;nop;nop;nop;nop;nop\n\t"	\
38 		".set\treorder");
39 
40 static void dump_tlb(int first, int last)
41 {
42 	unsigned long s_entryhi, entryhi, asid;
43 	unsigned long long entrylo0, entrylo1;
44 	unsigned int s_index, pagemask, c0, c1, i;
45 
46 	s_entryhi = read_c0_entryhi();
47 	s_index = read_c0_index();
48 	asid = s_entryhi & 0xff;
49 
50 	for (i = first; i <= last; i++) {
51 		write_c0_index(i);
52 		BARRIER();
53 		tlb_read();
54 		BARRIER();
55 		pagemask = read_c0_pagemask();
56 		entryhi  = read_c0_entryhi();
57 		entrylo0 = read_c0_entrylo0();
58 		entrylo1 = read_c0_entrylo1();
59 
60 		/* Unused entries have a virtual address of CKSEG0.  */
61 		if ((entryhi & ~0x1ffffUL) != CKSEG0
62 		    && (entryhi & 0xff) == asid) {
63 #ifdef CONFIG_32BIT
64 			int width = 8;
65 #else
66 			int width = 11;
67 #endif
68 			/*
69 			 * Only print entries in use
70 			 */
71 			printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
72 
73 			c0 = (entrylo0 >> 3) & 7;
74 			c1 = (entrylo1 >> 3) & 7;
75 
76 			printk("va=%0*lx asid=%02lx\n",
77 			       width, (entryhi & ~0x1fffUL),
78 			       entryhi & 0xff);
79 			printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
80 			       width,
81 			       (entrylo0 << 6) & PAGE_MASK, c0,
82 			       (entrylo0 & 4) ? 1 : 0,
83 			       (entrylo0 & 2) ? 1 : 0,
84 			       (entrylo0 & 1) ? 1 : 0);
85 			printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
86 			       width,
87 			       (entrylo1 << 6) & PAGE_MASK, c1,
88 			       (entrylo1 & 4) ? 1 : 0,
89 			       (entrylo1 & 2) ? 1 : 0,
90 			       (entrylo1 & 1) ? 1 : 0);
91 		}
92 	}
93 	printk("\n");
94 
95 	write_c0_entryhi(s_entryhi);
96 	write_c0_index(s_index);
97 }
98 
99 void dump_tlb_all(void)
100 {
101 	dump_tlb(0, current_cpu_data.tlbsize - 1);
102 }
103