root/loader/a1400/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 #define DEBUG_LED ((volatile int *)0xC0220120 ) // Green LED
   7 #define DELAY 500000
   9 void __attribute__((noreturn)) my_restart() 
  10 {
  11     // DEBUG: blink led
  12     /*
  13     int counter;
  14 
  15     while(1) {
  16     counter = DELAY; *DEBUG_LED = 0x46;  while (counter--) { asm("nop\n nop\n"); };
  17     counter = DELAY; *DEBUG_LED = 0x44;  while (counter--) { asm("nop\n nop\n"); };
  18     }
  19     */
  21   long *dst = (long*)MEMISOSTART;
  22   const long *src = blob_chdk_core;
  23   long length = (blob_chdk_core_size + 3) >> 2;
core_copy(src, dst, length);
  27 // restart function
  28     // from sub_ff831200 via 0x12345678
  29     // note, the normal stores to a bunch of MMIOs do not appear to be present
  30     asm volatile (
  31         "MRS     R0, CPSR\n"
  32         "BIC     R0, R0, #0x3F\n"
  33         "ORR     R0, R0, #0xD3\n"
  34         "MSR     CPSR, R0\n"
  36         "MOV     R0, #0x78 \n"
  37         "MCR     p15, 0, R0, c1, c0 \n"
  38         "MOV     R0, #0 \n"
  39         "MCR     p15, 0, R0, c7, c10, 4 \n"
  40         "MCR     p15, 0, R0, c7, c5 \n"
  41         "MCR     p15, 0, R0, c7, c6 \n"
  42         "MOV     R0, #0x80000006 \n"
  43         "MCR     p15, 0, R0, c9, c1 \n"
  44         "MCR     p15, 0, R0, c9, c1, 1 \n"
  45         "MRC     p15, 0, R0, c1, c0 \n"
  46         "ORR     R0, R0, #0x50000 \n"
  47         "MCR     p15, 0, R0, c1, c0 \n"
  48         "LDR     R0, =0x12345678 \n"  // marker value stored in TCM
  49         "MOV     R1, #0x80000000 \n"
  50         "STR     R0, [R1, #0xFFC] \n"
  51         //"LDR     R0, =0xFF810000 \n"     //original jump-vector
  52         "MOV     R0, %0\n"              // new jump-vector
  53         //"LDMFD   SP!, {R4,LR}\n"
  54         "BX      R0 \n"
  55         : : "r"(MEMISOSTART) : "memory","r0","r1","r2","r3","r4");
  57     while(1);
  58 }