diff options
Diffstat (limited to 'kernel/sched/mcu/atmega2560/context.c')
| -rw-r--r-- | kernel/sched/mcu/atmega2560/context.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/mcu/atmega2560/context.c b/kernel/sched/mcu/atmega2560/context.c index ef7e172..10f16a9 100644 --- a/kernel/sched/mcu/atmega2560/context.c +++ b/kernel/sched/mcu/atmega2560/context.c @@ -4,6 +4,7 @@ char* init_stack(const char* const mem_low, const char* const mem_high, void (*e char* sp = (char*) mem_high; unsigned long address = (unsigned long) entry; + // pattern for debugging purposes *sp = (char) 0x1; sp--; *sp = (char) 0x2; @@ -13,6 +14,7 @@ char* init_stack(const char* const mem_low, const char* const mem_high, void (*e *sp = (char) 0x2; sp--; + // put return address on stack *sp = (char) ( address & (unsigned short) 0x00ff ); sp--; @@ -22,6 +24,7 @@ char* init_stack(const char* const mem_low, const char* const mem_high, void (*e *sp = (char) ( (address >> 16) & ( unsigned short ) 0x00ff ); sp--; + // save registers *sp = (char) 0x00; //r0 sp--; *sp = (char) 0x80; //SREG, enable interrupts when task starts |