From: Keith Packard <keithp@keithp.com>
Date: Sat, 26 Mar 2016 22:49:59 +0000 (-0700)
Subject: altos/stm: Run scheduler code on interrupt stack
X-Git-Tag: 1.6.3~2^2~72
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=6a9546413d6a236c010e806b50506d870961d074

altos/stm: Run scheduler code on interrupt stack

This provides a bit more room for tasks on their stack

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h
index 42f1a2e5..02b344b1 100644
--- a/src/stm/ao_arch_funcs.h
+++ b/src/stm/ao_arch_funcs.h
@@ -335,6 +335,13 @@ static inline void ao_arch_save_stack(void) {
 
 static inline void ao_arch_restore_stack(void) {
 	uint32_t	sp;
+	uint32_t	control;
+
+	asm("mrs %0,control" : "=&r" (control));
+	control |= (1 << 1);
+	asm("msr control,%0" : : "r" (control));
+	asm("isb");
+
 	sp = (uint32_t) ao_cur_task->sp;
 
 	/* Switch stacks */
@@ -375,7 +382,14 @@ static inline void ao_arch_start_scheduler(void) {
 }
 #endif
 
-#define ao_arch_isr_stack()
+static inline void ao_arch_isr_stack(void) {
+	uint32_t	control;
+
+	asm("mrs %0,control" : "=&r" (control));
+	control &= ~(1 << 1);
+	asm("msr control,%0" : : "r" (control));
+	asm("isb");
+}
 
 #endif