Merge branch 'for-rmk-realview' of git://linux-arm.org/linux-2.6 into devel
[linux-2.6] / arch / mips / 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
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 }