Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild
[linux-2.6] / arch / mips / lib-32 / 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/cpu.h>
15 #include <asm/mipsregs.h>
16 #include <asm/page.h>
17 #include <asm/pgtable.h>
18
19 static inline const char *msk2str(unsigned int mask)
20 {
21         switch (mask) {
22         case PM_4K:
23                 return "4kb";
24         case PM_16K:
25                 return "16kb";
26         case PM_64K:
27                 return "64kb";
28         case PM_256K:
29                 return "256kb";
30 #ifndef CONFIG_CPU_VR41XX
31         case PM_1M:
32                 return "1Mb";
33         case PM_4M:
34                 return "4Mb";
35         case PM_16M:
36                 return "16Mb";
37         case PM_64M:
38                 return "64Mb";
39         case PM_256M:
40                 return "256Mb";
41 #endif
42         }
43
44         return "unknown";
45 }
46
47 #define BARRIER()                                       \
48         __asm__ __volatile__(                           \
49                 ".set\tnoreorder\n\t"                   \
50                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
51                 ".set\treorder");
52
53 void dump_tlb(int first, int last)
54 {
55         unsigned int pagemask, c0, c1, asid;
56         unsigned long long entrylo0, entrylo1;
57         unsigned long entryhi;
58         int i;
59
60         asid = read_c0_entryhi() & 0xff;
61
62         printk("\n");
63         for (i = first; i <= last; i++) {
64                 write_c0_index(i);
65                 BARRIER();
66                 tlb_read();
67                 BARRIER();
68                 pagemask = read_c0_pagemask();
69                 entryhi = read_c0_entryhi();
70                 entrylo0 = read_c0_entrylo0();
71                 entrylo1 = read_c0_entrylo1();
72
73                 /* Unused entries have a virtual address in KSEG0.  */
74                 if ((entryhi & 0xf0000000) != 0x80000000
75                     && (entryhi & 0xff) == asid) {
76                         /*
77                          * Only print entries in use
78                          */
79                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
80
81                         c0 = (entrylo0 >> 3) & 7;
82                         c1 = (entrylo1 >> 3) & 7;
83
84                         printk("va=%08lx asid=%02lx\n",
85                                (entryhi & 0xffffe000), (entryhi & 0xff));
86                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
87                                (entrylo0 << 6) & PAGE_MASK, c0,
88                                (entrylo0 & 4) ? 1 : 0,
89                                (entrylo0 & 2) ? 1 : 0, (entrylo0 & 1));
90                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
91                                (entrylo1 << 6) & PAGE_MASK, c1,
92                                (entrylo1 & 4) ? 1 : 0,
93                                (entrylo1 & 2) ? 1 : 0, (entrylo1 & 1));
94                         printk("\n");
95                 }
96         }
97
98         write_c0_entryhi(asid);
99 }
100
101 void dump_tlb_all(void)
102 {
103         dump_tlb(0, current_cpu_data.tlbsize - 1);
104 }
105
106 void dump_tlb_wired(void)
107 {
108         int wired;
109
110         wired = read_c0_wired();
111         printk("Wired: %d", wired);
112         dump_tlb(0, read_c0_wired());
113 }
114
115 void dump_tlb_addr(unsigned long addr)
116 {
117         unsigned int flags, oldpid;
118         int index;
119
120         local_irq_save(flags);
121         oldpid = read_c0_entryhi() & 0xff;
122         BARRIER();
123         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
124         BARRIER();
125         tlb_probe();
126         BARRIER();
127         index = read_c0_index();
128         write_c0_entryhi(oldpid);
129         local_irq_restore(flags);
130
131         if (index < 0) {
132                 printk("No entry for address 0x%08lx in TLB\n", addr);
133                 return;
134         }
135
136         printk("Entry %d maps address 0x%08lx\n", index, addr);
137         dump_tlb(index, index);
138 }
139
140 void dump_tlb_nonwired(void)
141 {
142         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
143 }
144
145 void dump_list_process(struct task_struct *t, void *address)
146 {
147         pgd_t *page_dir, *pgd;
148         pud_t *pud;
149         pmd_t *pmd;
150         pte_t *pte, page;
151         unsigned long addr, val;
152
153         addr = (unsigned long) address;
154
155         printk("Addr                 == %08lx\n", addr);
156         printk("task                 == %8p\n", t);
157         printk("task->mm             == %8p\n", t->mm);
158         //printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
159
160         if (addr > KSEG0) {
161                 page_dir = pgd_offset_k(0);
162                 pgd = pgd_offset_k(addr);
163         } else if (t->mm) {
164                 page_dir = pgd_offset(t->mm, 0);
165                 pgd = pgd_offset(t->mm, addr);
166         } else {
167                 printk("Current thread has no mm\n");
168                 return;
169         }
170         printk("page_dir == %08x\n", (unsigned int) page_dir);
171         printk("pgd == %08x, ", (unsigned int) pgd);
172         pud = pud_offset(pgd, addr);
173         printk("pud == %08x, ", (unsigned int) pud);
174
175         pmd = pmd_offset(pud, addr);
176         printk("pmd == %08x, ", (unsigned int) pmd);
177
178         pte = pte_offset(pmd, addr);
179         printk("pte == %08x, ", (unsigned int) pte);
180
181         page = *pte;
182 #ifdef CONFIG_64BIT_PHYS_ADDR
183         printk("page == %08Lx\n", pte_val(page));
184 #else
185         printk("page == %08lx\n", pte_val(page));
186 #endif
187
188         val = pte_val(page);
189         if (val & _PAGE_PRESENT)
190                 printk("present ");
191         if (val & _PAGE_READ)
192                 printk("read ");
193         if (val & _PAGE_WRITE)
194                 printk("write ");
195         if (val & _PAGE_ACCESSED)
196                 printk("accessed ");
197         if (val & _PAGE_MODIFIED)
198                 printk("modified ");
199         if (val & _PAGE_R4KBUG)
200                 printk("r4kbug ");
201         if (val & _PAGE_GLOBAL)
202                 printk("global ");
203         if (val & _PAGE_VALID)
204                 printk("valid ");
205         printk("\n");
206 }
207
208 void dump_list_current(void *address)
209 {
210         dump_list_process(current, address);
211 }
212
213 unsigned int vtop(void *address)
214 {
215         pgd_t *pgd;
216         pud_t *pud;
217         pmd_t *pmd;
218         pte_t *pte;
219         unsigned int addr, paddr;
220
221         addr = (unsigned long) address;
222         pgd = pgd_offset(current->mm, addr);
223         pud = pud_offset(pgd, addr);
224         pmd = pmd_offset(pud, addr);
225         pte = pte_offset(pmd, addr);
226         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
227         paddr |= (addr & ~PAGE_MASK);
228
229         return paddr;
230 }
231
232 void dump16(unsigned long *p)
233 {
234         int i;
235
236         for (i = 0; i < 8; i++) {
237                 printk("*%08lx == %08lx, ", (unsigned long) p, *p);
238                 p++;
239                 printk("*%08lx == %08lx\n", (unsigned long) p, *p);
240                 p++;
241         }
242 }