File: /usr/src/linux/arch/mips/lib/r3k_dump_tlb.c
1 /*
2 * Dump R3000 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 * Copyright (C) 1999 by Harald Koerfgen
7 */
8 #include <linux/kernel.h>
9 #include <linux/mm.h>
10 #include <linux/sched.h>
11 #include <linux/string.h>
12
13 #include <asm/bootinfo.h>
14 #include <asm/cachectl.h>
15 #include <asm/mipsregs.h>
16 #include <asm/page.h>
17 #include <asm/pgtable.h>
18
19 #define mips_tlb_entries 64
20
21 void
22 dump_tlb(int first, int last)
23 {
24 int i;
25 unsigned int asid;
26 unsigned long entryhi, entrylo0;
27
28 asid = get_entryhi() & 0xfc0;
29
30 for(i=first;i<=last;i++)
31 {
32 write_32bit_cp0_register(CP0_INDEX, i<<8);
33 __asm__ __volatile__(
34 ".set\tnoreorder\n\t"
35 "tlbr\n\t"
36 "nop\n\t"
37 ".set\treorder");
38 entryhi = read_32bit_cp0_register(CP0_ENTRYHI);
39 entrylo0 = read_32bit_cp0_register(CP0_ENTRYLO0);
40
41 /* Unused entries have a virtual address of KSEG0. */
42 if ((entryhi & 0xffffe000) != 0x80000000
43 && (entryhi & 0xfc0) == asid) {
44 /*
45 * Only print entries in use
46 */
47 printk("Index: %2d ", i);
48
49 printk("va=%08lx asid=%08lx"
50 " [pa=%06lx n=%d d=%d v=%d g=%d]",
51 (entryhi & 0xffffe000),
52 entryhi & 0xfc0,
53 entrylo0 & PAGE_MASK,
54 (entrylo0 & (1 << 11)) ? 1 : 0,
55 (entrylo0 & (1 << 10)) ? 1 : 0,
56 (entrylo0 & (1 << 9)) ? 1 : 0,
57 (entrylo0 & (1 << 8)) ? 1 : 0);
58 }
59 }
60 printk("\n");
61
62 set_entryhi(asid);
63 }
64
65 void
66 dump_tlb_all(void)
67 {
68 dump_tlb(0, mips_tlb_entries - 1);
69 }
70
71 void
72 dump_tlb_wired(void)
73 {
74 int wired = 7;
75
76 printk("Wired: %d", wired);
77 dump_tlb(0, read_32bit_cp0_register(CP0_WIRED));
78 }
79
80 void
81 dump_tlb_addr(unsigned long addr)
82 {
83 unsigned int flags, oldpid;
84 int index;
85
86 __save_and_cli(flags);
87 oldpid = get_entryhi() & 0xff;
88 set_entryhi((addr & PAGE_MASK) | oldpid);
89 tlb_probe();
90 index = get_index();
91 set_entryhi(oldpid);
92 __restore_flags(flags);
93
94 if (index < 0) {
95 printk("No entry for address 0x%08lx in TLB\n", addr);
96 return;
97 }
98
99 printk("Entry %d maps address 0x%08lx\n", index, addr);
100 dump_tlb(index, index);
101 }
102
103 void
104 dump_tlb_nonwired(void)
105 {
106 dump_tlb(8, mips_tlb_entries - 1);
107 }
108
109 void
110 dump_list_process(struct task_struct *t, void *address)
111 {
112 pgd_t *page_dir, *pgd;
113 pmd_t *pmd;
114 pte_t *pte, page;
115 unsigned int addr;
116 unsigned long val;
117
118 addr = (unsigned int) address;
119
120 printk("Addr == %08x\n", addr);
121 printk("tasks->mm.pgd == %08x\n", (unsigned int) t->mm->pgd);
122
123 page_dir = pgd_offset(t->mm, 0);
124 printk("page_dir == %08x\n", (unsigned int) page_dir);
125
126 pgd = pgd_offset(t->mm, addr);
127 printk("pgd == %08x, ", (unsigned int) pgd);
128
129 pmd = pmd_offset(pgd, addr);
130 printk("pmd == %08x, ", (unsigned int) pmd);
131
132 pte = pte_offset(pmd, addr);
133 printk("pte == %08x, ", (unsigned int) pte);
134
135 page = *pte;
136 printk("page == %08x\n", (unsigned int) pte_val(page));
137
138 val = pte_val(page);
139 if (val & _PAGE_PRESENT) printk("present ");
140 if (val & _PAGE_READ) printk("read ");
141 if (val & _PAGE_WRITE) printk("write ");
142 if (val & _PAGE_ACCESSED) printk("accessed ");
143 if (val & _PAGE_MODIFIED) printk("modified ");
144 if (val & _PAGE_GLOBAL) printk("global ");
145 if (val & _PAGE_VALID) printk("valid ");
146 printk("\n");
147 }
148
149 void
150 dump_list_current(void *address)
151 {
152 dump_list_process(current, address);
153 }
154
155 unsigned int
156 vtop(void *address)
157 {
158 pgd_t *pgd;
159 pmd_t *pmd;
160 pte_t *pte;
161 unsigned int addr, paddr;
162
163 addr = (unsigned long) address;
164 pgd = pgd_offset(current->mm, addr);
165 pmd = pmd_offset(pgd, addr);
166 pte = pte_offset(pmd, addr);
167 paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
168 paddr |= (addr & ~PAGE_MASK);
169
170 return paddr;
171 }
172
173 void
174 dump16(unsigned long *p)
175 {
176 int i;
177
178 for(i=0;i<8;i++)
179 {
180 printk("*%08lx == %08lx, ",
181 (unsigned long)p, (unsigned long)*p++);
182 printk("*%08lx == %08lx\n",
183 (unsigned long)p, (unsigned long)*p++);
184 }
185 }
186