1 /*
2 *********************
3 SX130
4 **********************
5 */
6
7
8 /*
9 * Operating system has died. Known functions will be killed
10 * after memmove.
11 *
12 * Make sure stack is not used.
13 */
14
15
16 void __attribute__((noreturn)) copy_and_restart(void *dst_void, const void *src_void, long length)
17 {
18
19 {
20 char *dst = dst_void;
21 const char *src = src_void;
22
23 if (src < dst && dst < src + length) {
24 /* Have to copy backwards */
25 src += length;
26 dst += length;
27 while (length--)
28 {
29 *--dst = *--src;
30 }
31 }
32 else {
33 while (length--) {
34 *dst++ = *src++;
35 }
36 }
37 }
38
39 // DEBUG: jump to regular firmware-boot (causing a boot loop)
40 //dst_void = (void*) 0xFF810000;
41
42 // resetcode here:
43 // s95 100e @FF83C5E8
44 // sx130 101c @FF83BE74
45 // code is the same
46 asm volatile (
47 "MRS R0, CPSR\n"
48 "BIC R0, R0, #0x3F\n"
49 "ORR R0, R0, #0xD3\n"
50 "MSR CPSR, R0\n"
51 "LDR R1, =0xC0200000\n"
52 "MOV R0, #0xFFFFFFFF\n"
53 "STR R0, [R1,#0x10C]\n"
54 "STR R0, [R1,#0xC]\n"
55 "STR R0, [R1,#0x1C]\n"
56 "STR R0, [R1,#0x2C]\n"
57 "STR R0, [R1,#0x3C]\n"
58 "STR R0, [R1,#0x4C]\n"
59 "STR R0, [R1,#0x5C]\n"
60 "STR R0, [R1,#0x6C]\n"
61 "STR R0, [R1,#0x7C]\n"
62 "STR R0, [R1,#0x8C]\n"
63 "STR R0, [R1,#0x9C]\n"
64 "STR R0, [R1,#0xAC]\n"
65 "STR R0, [R1,#0xBC]\n"
66 "STR R0, [R1,#0xCC]\n"
67 "STR R0, [R1,#0xDC]\n"
68 "STR R0, [R1,#0xEC]\n"
69 "CMP R4, #7\n"
70 "STR R0, [R1,#0xFC]\n"
71 "LDMEQFD SP!, {R4,PC}\n"
72 "MOV R0, #0x78\n"
73 "MCR p15, 0, R0,c1,c0\n"
74 "MOV R0, #0\n"
75 "MCR p15, 0, R0,c7,c10, 4\n"
76 "MCR p15, 0, R0,c7,c5\n"
77 "MCR p15, 0, R0,c7,c6\n"
78 "MOV R0, #0x80000006\n"
79 "MCR p15, 0, R0,c9,c1\n"
80 "MCR p15, 0, R0,c9,c1, 1\n"
81 "MRC p15, 0, R0,c1,c0\n"
82 "ORR R0, R0, #0x50000\n"
83 "MCR p15, 0, R0,c1,c0\n"
84 "LDR R0, =0x12345678\n"
85 "MOV R1, #0x80000000\n"
86 "STR R0, [R1,#0xFFC]\n"
87
88 //"LDR R0, =0xFF810000\n" // original jump-vector
89 "MOV R0, %0\n" // new jump-vector
90
91 "LDMFD SP!, {R4,LR}\n"
92 "BX R0\n"
93 : : "r"(dst_void) : "memory","r0","r1","r2","r3","r4"
94 );
95
96 while(1);
97 }