+#define ao_arch_nop() asm("nop")
+
+#define ao_arch_interrupt(n) /* nothing */
+
+#undef putchar
+#undef getchar
+#define putchar(c) ao_putchar(c)
+#define getchar ao_getchar
+
+extern void putchar(char c);
+extern char getchar(void);
+
+extern int ao_serial_number;
+
+#define ao_arch_init_stack(task, start) do { \
+ uint8_t *sp = task->stack + AO_STACK_SIZE - 1; \
+ uint16_t a = (uint16_t) start; \
+ int i; \
+ \
+ /* Return address */ \
+ PUSH8(sp, a); \
+ PUSH8(sp, (a >> 8)); \
+ \
+ /* Clear register values */ \
+ i = 32; \
+ while (i--) \
+ PUSH8(sp, 0); \
+ \
+ /* SREG with interrupts enabled */ \
+ PUSH8(sp, 0x80); \
+ task->sp = sp; \
+} while (0);
+
+#define ao_arch_save_context() do { \
+ asm("push r31" "\n\t" "push r30"); \
+ asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
+ asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
+ asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
+ asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
+ asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
+ asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
+ asm("in r0, __SREG__" "\n\t" "push r0"); \
+ sei(); \
+ } while (0)
+