X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=ao_task.c;h=0af5043cd67738ea33c1976ce8b569f761c3f1de;hp=4f7387e310f595fe921b6a3b3c604d2ebd934ce3;hb=e14f07bfdb8824fc7ed6df1129c66ee39ffd6d54;hpb=1903a86bf2cc6b685ccc475e62eabe49a4ec5b43

diff --git a/ao_task.c b/ao_task.c
index 4f7387e3..0af5043c 100644
--- a/ao_task.c
+++ b/ao_task.c
@@ -3,8 +3,7 @@
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * the Free Software Foundation; version 2 of the License.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -74,9 +73,9 @@ ao_yield(void) _naked
 		/* Push ACC first, as when restoring the context it must be restored
 		 * last (it is used to set the IE register). */
 		push	ACC
-		/* Store the IE register then disable interrupts. */
+		/* Store the IE register then enable interrupts. */
 		push	_IEN0
-		clr	_EA
+		setb	_EA
 		push	DPL
 		push	DPH
 		push	b
@@ -98,7 +97,7 @@ ao_yield(void) _naked
 	if (ao_cur_task_id != AO_NO_TASK)
 	{
 		/* Save the current stack */
-		stack_len = SP - AO_STACK_START;
+		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;
@@ -107,7 +106,7 @@ ao_yield(void) _naked
 	}
 	
 	/* Empty the stack; might as well let interrupts have the whole thing */
-	SP = AO_STACK_START;
+	SP = AO_STACK_START - 1;
 
 	/* Find a task to run. If there isn't any runnable task,
 	 * this loop will run forever, which is just fine
@@ -123,11 +122,12 @@ ao_yield(void) _naked
 
 	/* 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;
 	while (stack_len--)
 		*stack_ptr++ = *save_ptr++;
-	SP = (uint8_t) (stack_ptr - 1);
 
 	_asm
 		pop		_bp