source: trunk/softs/tests_cc_vcache/test_sync/test.S @ 481

Last change on this file since 481 was 269, checked in by haoliu, 12 years ago

fix bug for test_sync
File size: 1.9 KB
Line 
1/*
2 * sync test: we map the tty cached. If sync doesn't work some chars will be
3 * lost because writes are combined in the write buffer.
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_SYNC(startstr)
17
18        /* reset cop0 status (keep BEV) */
19        lui     a0, 0x0040;
20        mtc0    a0, COP0_STATUS
21
22        la      a0, pte1
23        srl     a0, a0, 13
24        mtc2    a0, VC_PTPR
25        nop
26
27        li      a0, VC_TLB_EN_ITLB | VC_TLB_EN_DTLB | VC_TLB_EN_ICACHE | VC_TLB_EN_DCACHE
28        mtc2    a0, VC_TLB_EN
29
30        PRINT_SYNC(mmustr)
31
32        /*
33         * print several chars quickly: without sync not all of them will
34         * show up
35         */
36#define WRITE_TTY sb a0, 0(k0); sync
37        la a0, '@'
38        WRITE_TTY
39        WRITE_TTY
40        WRITE_TTY
41        WRITE_TTY
42        WRITE_TTY
43        WRITE_TTY
44        PUTCHAR('\n')
45
46        /* we should get there */
47        EXIT(0)
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        PUTCHAR('\n')
69        /* we should not get there */
70        EXIT(1)
71
72        .rodata:
73statusstr: .ascii "status \0"
74causestr: .ascii " cause \0"
75pcstr: .ascii " pc \0"
76badvastr: .ascii " badva \0"
77mmustr: .ascii "mmu started\n\0"
78startstr: .ascii "start\n\0"
79
80        .org EXCEP_ADDRESS - BOOT_ADDRESS
81        .globl evect
82evect:
83        j       excep
84        nop
85        .data
86        .word MAGIC1
87testval:
88        .word MAGIC2
89        .globl pte1
90pte1:
91        .align 13
92        .word PTE1_V | PTE1_C | PTE1_W | 0x0 /* map PA 0 at VA 0 */
93        .org pte1 + (BOOT_ADDRESS >> 21) * 4
94        .word PTE1_V | PTE1_C | PTE1_X | (BOOT_ADDRESS >> 21) /* map PA 0xbfc00000 at VA 0xbfc00000 */
95        .org pte1 + (TTY_BASE >> 21) * 4
96        .word PTE1_V | PTE1_C | PTE1_W | (TTY_BASE >> 21) /* map PA 0xd0200000 at VA 0xd0200000 *cached!* */
97        .org pte1 + (EXIT_BASE >> 21) * 4
98        .word PTE1_V | PTE1_W | (EXIT_BASE >> 21) /* map PA 0xe0000000 at VA 0xe0000000 */
99        .org pte1 + 8192
100        .word 0
101
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