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