source: trunk/softs/tests_cc_vcache/test_mmu_basic/test.S@ 936

Last change on this file since 936 was 520, checked in by bouyer, 13 years ago

Re-add the tests; reverting previous which was done at the wrong level (sorry)
File size: 1.9 KB
Line 
1/*
2 * Basic MMU checks: we can read mapped addresses, we can't read unmapped
3 * addresses
4 */
5#include <registers.h>
6#include <misc.h>
7#include <vcache.h>
8
9 .text
10 .globl _start
11_start:
12 .set noreorder
13 la k0, TTY_BASE
14 la k1, EXIT_BASE
15
16 PRINT(startstr)
17
18 la a0, pte1
19 srl a0, a0, 13
20 mtc2 a0, VC_PTPR
21 nop
22
23 li a0, VC_TLB_EN_ITLB | VC_TLB_EN_DTLB | VC_TLB_EN_ICACHE | VC_TLB_EN_DCACHE
24 mtc2 a0, VC_TLB_EN
25
26 PRINT(mmustr)
27
28 /* we can read our magic number at 0x00200000 */
29 la s0, 0x00200000
30 move a0, s0
31 PRINTX
32 PUTCHAR(':')
33 PUTCHAR(' ')
34 lw a0, 0(s0)
35 PRINTX
36 PUTCHAR('\n')
37 /* but not at 0x00000000 */
38 la s0, 0x00000000
39 move a0, s0
40 PRINTX
41 PUTCHAR(':')
42 PUTCHAR(' ')
43 lw a0, 0(s0) /* this should trigger the exception */
44 PRINTX
45
46 /* we shouldn't get there */
47 EXIT(1)
48
49 .globl excep
50excep:
51 .set noreorder
52 PRINT(statusstr)
53 mfc0 a0, COP0_STATUS
54 PRINTX
55
56 PRINT(causestr)
57 mfc0 a0, COP0_CAUSE
58 PRINTX
59
60 PRINT(pcstr)
61 mfc0 a0, COP0_EXPC
62 PRINTX
63
64 PRINT(badvastr)
65 mfc0 a0, COP_0_BADVADDR
66 PRINTX
67
68 li a0, '\n'
69 sb a0, 0(k0)
70
71 EXIT(0)
72
73 .rodata:
74statusstr: .ascii "status \0"
75causestr: .ascii " cause \0"
76pcstr: .ascii " pc \0"
77badvastr: .ascii " badva \0"
78mmustr: .ascii "mmu started\n\0"
79startstr: .ascii "start\n\0"
80
81 .org EXCEP_ADDRESS - BOOT_ADDRESS
82 .globl evect
83evect:
84 j excep
85 nop
86 .data
87testval:
88 .word MAGIC1
89 .align 13
90 .globl pte1
91pte1:
92 .word 0x0 /* map PA 0 at VA 0 */
93 .word PTE1_V | PTE1_C | PTE1_W | 0x0 /* map PA 0 at VA 0x00200000 */
94 .org pte1 + (BOOT_ADDRESS >> 21) * 4
95 .word PTE1_V | PTE1_C | PTE1_X | (BOOT_ADDRESS >> 21) /* map PA 0xbfc00000 at VA 0xbfc00000 */
96 .org pte1 + (TTY_BASE >> 21) * 4
97 .word PTE1_V | PTE1_W | (TTY_BASE >> 21) /* map PA 0xd0200000 at VA 0xd0200000 */
98 .org pte1 + (EXIT_BASE >> 21) * 4
99 .word PTE1_V | PTE1_W | (EXIT_BASE >> 21) /* map PA 0xe0000000 at VA 0xe0000000 */
100 .org pte1 + 8192
101 .word 0
102
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