root/loader/sx510hs/main.c

DEFINITIONS

1. my_restart

   1 #include "../generic/check_compat.c"
   3 extern long *blob_chdk_core;
   4 extern long blob_chdk_core_size;
   6 //TODO
   7 #define DEBUG_LED ((volatile int *)0xC0223030) // AF, green not found
   8 #define DELAY 500000
  10 void __attribute__((noreturn)) my_restart() 
  11 {
  12     // DEBUG: blink led
  13     /*
  14     int counter;
  15 
  16     while(1) {
  17     counter = DELAY; *DEBUG_LED = 0x46;  while (counter--) { asm("nop\n nop\n"); };
  18     counter = DELAY; *DEBUG_LED = 0x44;  while (counter--) { asm("nop\n nop\n"); };
  19     }
  20     */
  22     long *dst = (long*)MEMISOSTART;
  23     const long *src = blob_chdk_core;
  24     long length = (blob_chdk_core_size + 3) >> 2;
core_copy(src, dst, length);
  28 // restart function
  29     // from sub_ff01786c via 0x12345678 - sx510hs 100c
  30     // note, the normal stores to a bunch of MMIOs do not appear to be present
  31     asm volatile (
  32         "MRS     R0, CPSR\n"
  33         "BIC     R0, R0, #0x3F\n"
  34         "ORR     R0, R0, #0xD3\n"
  35         "MSR     CPSR, R0\n"
  37         "MOV     R0, #0x78 \n"
  38         "MCR     p15, 0, R0, c1, c0 \n"
  39         "MOV     R0, #0 \n"
  40         "MCR     p15, 0, R0, c7, c10, 4 \n"
  41         "MCR     p15, 0, R0, c7, c5 \n"
  42         "MCR     p15, 0, R0, c7, c6 \n"
  43         "MOV     R0, #0x80000006 \n"
  44         "MCR     p15, 0, R0, c9, c1 \n"
  45         "MCR     p15, 0, R0, c9, c1, 1 \n"
  46         "MRC     p15, 0, R0, c1, c0 \n"
  47         "ORR     R0, R0, #0x50000 \n"
  48         "MCR     p15, 0, R0, c1, c0 \n"
  49         "LDR     R0, =0x12345678 \n"
  50         "MOV     R1, #0x80000000 \n"
  51         "STR     R0, [R1, #0xFFC] \n"
  52         // "LDMFD   SP!, {R4,LR} \n"
  53         // "MOV     R0, #0xFF000000 \n"
  54         "MOV     R0, %0\n"
  55         "BX      R0 \n"
  56         : : "r"(MEMISOSTART) : "memory","r0","r1","r2","r3","r4");
  58     while(1);
  59 }