+#define ao_arch_save_regs() \
+ __asm \
+ /* Push ACC first, as when restoring the context it must be restored \
+ * last (it is used to set the IE register). */ \
+ push ACC \
+ push _IEN0 \
+ push DPL \
+ push DPH \
+ push b \
+ push ar2 \
+ push ar3 \
+ push ar4 \
+ push ar5 \
+ push ar6 \
+ push ar7 \
+ push ar0 \
+ push ar1 \
+ push PSW \
+ __endasm; \
+ PSW = 0; \
+ __asm \
+ push _bp \
+ __endasm
+
+#define ao_arch_save_stack() { \
+ uint8_t stack_len; \
+ __data uint8_t *stack_ptr; \
+ __xdata uint8_t *save_ptr; \
+ /* Save the current stack */ \
+ stack_len = SP - (AO_STACK_START - 1); \
+ ao_cur_task->stack_count = stack_len; \
+ stack_ptr = (uint8_t __data *) AO_STACK_START; \
+ save_ptr = (uint8_t __xdata *) ao_cur_task->stack; \
+ do \
+ *save_ptr++ = *stack_ptr++; \
+ while (--stack_len); \
+ }
+
+/* Empty the stack; might as well let interrupts have the whole thing */
+#define ao_arch_isr_stack() (SP = AO_STACK_START - 1)
+
+#define ao_arch_block_interrupts() __asm clr _EA __endasm
+#define ao_arch_release_interrupts() __asm setb _EA __endasm
+
+/* Idle the CPU, waking when an interrupt occurs */
+#define ao_arch_wait_interrupt() do { \
+ ao_arch_release_interrupts(); \
+ (PCON = PCON_IDLE); \
+ ao_arch_block_interrupts(); \
+ } while (0)
+
+#define ao_arch_restore_stack() { \
+ uint8_t stack_len; \
+ __data uint8_t *stack_ptr; \
+ __xdata uint8_t *save_ptr; \
+ \
+ /* Restore the old stack */ \
+ stack_len = ao_cur_task->stack_count; \
+ SP = AO_STACK_START - 1 + stack_len; \
+ \
+ stack_ptr = (uint8_t __data *) AO_STACK_START; \
+ save_ptr = (uint8_t __xdata *) ao_cur_task->stack; \
+ do \
+ *stack_ptr++ = *save_ptr++; \
+ while (--stack_len); \
+ \
+ __asm \
+ pop _bp \
+ pop PSW \
+ pop ar1 \
+ pop ar0 \
+ pop ar7 \
+ pop ar6 \
+ pop ar5 \
+ pop ar4 \
+ pop ar3 \
+ pop ar2 \
+ pop b \
+ pop DPH \
+ pop DPL \
+ /* The next byte of the stack is the IE register. Only the global \
+ enable bit forms part of the task context. Pop off the IE then set \
+ the global enable bit to match that of the stored IE register. */ \
+ pop ACC \
+ JB ACC.7,0098$ \
+ CLR _EA \
+ LJMP 0099$ \
+ 0098$: \
+ SETB _EA \
+ 0099$: \
+ /* Finally restore ACC, which was the first register saved. */ \
+ pop ACC \
+ ret \
+ __endasm; \
+}
+
+#define ao_arch_critical(b) __critical { b }
+
+#define AO_DATA_RING 32
+
+/* ao_button.c */
+#ifdef HAS_BUTTON
+void
+ao_p0_isr(void) ao_arch_interrupt(13);
+
+void
+ao_p1_isr(void) ao_arch_interrupt(15);
+
+void
+ao_p2_isr(void);
+
+#define HAS_P2_ISR 1
+
+#endif
+
+void
+ao_button_init(void);
+
+char
+ao_button_get(void) __critical;
+
+void
+ao_button_clear(void) __critical;
+
+/* ao_string.c */
+
+void
+_ao_xmemcpy(__xdata void *dst, __xdata void *src, uint16_t count);
+
+#define ao_xmemcpy(d,s,c) _ao_xmemcpy(d,s,c)
+
+void
+_ao_xmemset(__xdata void *dst, uint8_t value, uint16_t count);
+
+#define ao_xmemset(d,v,c) _ao_xmemset(d,v,c)