File: /usr/src/linux/arch/mips64/lib/dump_tlb.c
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 #include <linux/sched.h>
10 #include <linux/string.h>
11
12 #include <asm/bootinfo.h>
13 #include <asm/cachectl.h>
14 #include <asm/mipsregs.h>
15 #include <asm/page.h>
16 #include <asm/pgtable.h>
17
18 #define mips_tlb_entries 64
19
20 void
21 dump_tlb(int first, int last)
22 {
23 unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
24 unsigned int s_index, pagemask, c0, c1, i;
25
26 s_entryhi = get_entryhi();
27 s_index = get_index();
28 asid = s_entryhi & 0xff;
29
30 for (i = first; i <= last; i++) {
31 write_32bit_cp0_register(CP0_INDEX, i);
32 __asm__ __volatile__(
33 ".set\tnoreorder\n\t"
34 "nop;nop;nop;nop\n\t"
35 "tlbr\n\t"
36 "nop;nop;nop;nop\n\t"
37 ".set\treorder");
38 pagemask = read_32bit_cp0_register(CP0_PAGEMASK);
39 entryhi = get_entryhi();
40 entrylo0 = get_entrylo0();
41 entrylo1 = get_entrylo1();
42
43 /* Unused entries have a virtual address of CKSEG0. */
44 if ((entryhi & ~0x1ffffUL) != CKSEG0
45 && (entryhi & 0xff) == asid) {
46 /*
47 * Only print entries in use
48 */
49 printk("Index: %2d pgmask=%08x ", i, pagemask);
50
51 c0 = (entrylo0 >> 3) & 7;
52 c1 = (entrylo1 >> 3) & 7;
53
54 printk("va=%08lx asid=%02lx"
55 " [pa=%06lx c=%d d=%d v=%d g=%ld]"
56 " [pa=%06lx c=%d d=%d v=%d g=%ld]\n",
57 (entryhi & ~0x1fffUL),
58 entryhi & 0xff,
59 entrylo0 & PAGE_MASK, c0,
60 (entrylo0 & 4) ? 1 : 0,
61 (entrylo0 & 2) ? 1 : 0,
62 (entrylo0 & 1),
63 entrylo1 & PAGE_MASK, c1,
64 (entrylo1 & 4) ? 1 : 0,
65 (entrylo1 & 2) ? 1 : 0,
66 (entrylo1 & 1));
67
68 }
69 }
70 printk("\n");
71
72 set_entryhi(s_entryhi);
73 set_index(s_index);
74 }
75
76 void
77 dump_tlb_all(void)
78 {
79 dump_tlb(0, mips_tlb_entries - 1);
80 }
81
82 void
83 dump_tlb_wired(void)
84 {
85 int wired;
86
87 wired = read_32bit_cp0_register(CP0_WIRED);
88 printk("Wired: %d", wired);
89 dump_tlb(0, read_32bit_cp0_register(CP0_WIRED));
90 }
91
92 #define BARRIER \
93 __asm__ __volatile__( \
94 ".set\tnoreorder\n\t" \
95 "nop;nop;nop;nop;nop;nop;nop\n\t" \
96 ".set\treorder");
97
98 void
99 dump_tlb_addr(unsigned long addr)
100 {
101 unsigned int flags, oldpid;
102 int index;
103
104 __save_and_cli(flags);
105 oldpid = get_entryhi() & 0xff;
106 BARRIER;
107 set_entryhi((addr & PAGE_MASK) | oldpid);
108 BARRIER;
109 tlb_probe();
110 BARRIER;
111 index = get_index();
112 set_entryhi(oldpid);
113 __restore_flags(flags);
114
115 if (index < 0) {
116 printk("No entry for address 0x%08lx in TLB\n", addr);
117 return;
118 }
119
120 printk("Entry %d maps address 0x%08lx\n", index, addr);
121 dump_tlb(index, index);
122 }
123
124 void
125 dump_tlb_nonwired(void)
126 {
127 dump_tlb(read_32bit_cp0_register(CP0_WIRED), mips_tlb_entries - 1);
128 }
129
130 void
131 dump_list_process(struct task_struct *t, void *address)
132 {
133 pgd_t *page_dir, *pgd;
134 pmd_t *pmd;
135 pte_t *pte, page;
136 unsigned long addr;
137 unsigned long val;
138
139 addr = (unsigned long) address;
140
141 printk("Addr == %08lx\n", addr);
142 printk("tasks->mm.pgd == %08lx\n", (unsigned long) t->mm->pgd);
143
144 page_dir = pgd_offset(t->mm, 0);
145 printk("page_dir == %08lx\n", (unsigned long) page_dir);
146
147 pgd = pgd_offset(t->mm, addr);
148 printk("pgd == %08lx, ", (unsigned long) pgd);
149
150 pmd = pmd_offset(pgd, addr);
151 printk("pmd == %08lx, ", (unsigned long) pmd);
152
153 pte = pte_offset(pmd, addr);
154 printk("pte == %08lx, ", (unsigned long) pte);
155
156 page = *pte;
157 printk("page == %08lx\n", (unsigned long) pte_val(page));
158
159 val = pte_val(page);
160 if (val & _PAGE_PRESENT) printk("present ");
161 if (val & _PAGE_READ) printk("read ");
162 if (val & _PAGE_WRITE) printk("write ");
163 if (val & _PAGE_ACCESSED) printk("accessed ");
164 if (val & _PAGE_MODIFIED) printk("modified ");
165 if (val & _PAGE_R4KBUG) printk("r4kbug ");
166 if (val & _PAGE_GLOBAL) printk("global ");
167 if (val & _PAGE_VALID) printk("valid ");
168 printk("\n");
169 }
170
171 void dump_list_current(void *address)
172 {
173 dump_list_process(current, address);
174 }
175
176 unsigned int vtop(void *address)
177 {
178 pgd_t *pgd;
179 pmd_t *pmd;
180 pte_t *pte;
181 unsigned int addr, paddr;
182
183 addr = (unsigned long) address;
184 pgd = pgd_offset(current->mm, addr);
185 pmd = pmd_offset(pgd, addr);
186 pte = pte_offset(pmd, addr);
187 paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
188 paddr |= (addr & ~PAGE_MASK);
189
190 return paddr;
191 }
192
193 void dump16(unsigned long *p)
194 {
195 int i;
196
197 for(i=0;i<8;i++)
198 {
199 printk("*%08lx == %08lx, ",
200 (unsigned long)p, (unsigned long)*p);
201 p++;
202 printk("*%08lx == %08lx\n",
203 (unsigned long)p, (unsigned long)*p);
204 p++;
205 }
206 }
207