diff options
Diffstat (limited to 'kernel/mcu/atmega2560/include/mcu/context.h')
-rw-r--r-- | kernel/mcu/atmega2560/include/mcu/context.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/kernel/mcu/atmega2560/include/mcu/context.h b/kernel/mcu/atmega2560/include/mcu/context.h new file mode 100644 index 0000000..5f6e947 --- /dev/null +++ b/kernel/mcu/atmega2560/include/mcu/context.h @@ -0,0 +1,123 @@ +#ifndef MCU_CONTEXT_H +#define MCU_CONTEXT_H + +#include <avr/interrupt.h> +#define ret() asm volatile ( "ret" ) + +/** Default stack size, you may use this definition for declaring tasks. */ +#define DEFAULT_STACK_SIZE 256 + +/** Stack size to be allocated for the idle task. */ +#define IDLE_STACK_SIZE 64 + +/* + * The macros save_context(), restore_context() as well as the code contained in + * init_stack is adapted from the FreeRTOS kernel (http://www.freertos.org/). + * Here by copyright, credits attributed to wherever they belong. + */ + +/** + * Save context to memory location specified by first two chars of + * a symbol named 'current' (this is why 'sp' has to be the first element of + * of task control blocks). After executing this macro, the stack pointer will + * be set to the address contained in 'kstack'. + */ +#define context_save() \ + asm volatile ( \ + "push r0 \n\t" \ + "in r0, __SREG__ \n\t" \ + "cli \n\t" \ + "push r0 \n\t" \ + "push r1 \n\t" \ + "clr r1 \n\t" \ + "push r2 \n\t" \ + "push r3 \n\t" \ + "push r4 \n\t" \ + "push r5 \n\t" \ + "push r6 \n\t" \ + "push r7 \n\t" \ + "push r8 \n\t" \ + "push r9 \n\t" \ + "push r10 \n\t" \ + "push r11 \n\t" \ + "push r12 \n\t" \ + "push r13 \n\t" \ + "push r14 \n\t" \ + "push r15 \n\t" \ + "push r16 \n\t" \ + "push r17 \n\t" \ + "push r18 \n\t" \ + "push r19 \n\t" \ + "push r20 \n\t" \ + "push r21 \n\t" \ + "push r22 \n\t" \ + "push r23 \n\t" \ + "push r24 \n\t" \ + "push r25 \n\t" \ + "push r26 \n\t" \ + "push r27 \n\t" \ + "push r28 \n\t" \ + "push r29 \n\t" \ + "push r30 \n\t" \ + "push r31 \n\t" \ + "lds r26, current \n\t" \ + "lds r27, current +1 \n\t" \ + "in r0, __SP_L__ \n\t" \ + "st x+, r0 \n\t" \ + "in r0, __SP_H__ \n\t" \ + "st x+, r0 \n\t" \ + ) + + +/** + * Restore context to memory location specified by first two chars of + * a symbol named 'current'. + */ +#define context_restore() \ + asm volatile ( \ + "lds r26, current \n\t" \ + "lds r27, current + 1 \n\t" \ + "ld r28, x+ \n\t" \ + "out __SP_L__, r28 \n\t" \ + "ld r29, x+ \n\t" \ + "out __SP_H__, r29 \n\t" \ + "pop r31 \n\t" \ + "pop r30 \n\t" \ + "pop r29 \n\t" \ + "pop r28 \n\t" \ + "pop r27 \n\t" \ + "pop r26 \n\t" \ + "pop r25 \n\t" \ + "pop r24 \n\t" \ + "pop r23 \n\t" \ + "pop r22 \n\t" \ + "pop r21 \n\t" \ + "pop r20 \n\t" \ + "pop r19 \n\t" \ + "pop r18 \n\t" \ + "pop r17 \n\t" \ + "pop r16 \n\t" \ + "pop r15 \n\t" \ + "pop r14 \n\t" \ + "pop r13 \n\t" \ + "pop r12 \n\t" \ + "pop r11 \n\t" \ + "pop r10 \n\t" \ + "pop r9 \n\t" \ + "pop r8 \n\t" \ + "pop r7 \n\t" \ + "pop r6 \n\t" \ + "pop r5 \n\t" \ + "pop r4 \n\t" \ + "pop r3 \n\t" \ + "pop r2 \n\t" \ + "pop r1 \n\t" \ + "pop r0 \n\t" \ + "out __SREG__, r0 \n\t" \ + "pop r0 \n\t" \ + ) + +/** Initialize the given memory addresses to contain a valid, initial stackframe. */ +char* stack_init(const char* const mem_low, const char* const mem_high, void (*entry)(char), char args); + +#endif |