altos/lpc: Use separate interrupt stack

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

diff --git a/src/lpc/ao_arch_funcs.h b/src/lpc/ao_arch_funcs.h
index bc4c47ee57b4f60eb9d41c258a7ba5101fa1d7cb..3cd873ec89c3017a4364fbd063935e4d094be012 100644 (file)
--- a/src/lpc/ao_arch_funcs.h
+++ b/src/lpc/ao_arch_funcs.h
@@ -208,4 +208,17 @@ ao_spi_init(void);
                }                                                       \
        } while (0)
 
+#define HAS_ARCH_START_SCHEDULER       1
+
+static inline void ao_arch_start_scheduler(void) {
+       uint32_t        sp;
+       uint32_t        control;
+
+       asm("mrs %0,msp" : "=&r" (sp));
+       asm("msr psp,%0" : : "r" (sp));
+       asm("mrs %0,control" : "=&r" (control));
+       control |= (1 << 1);
+       asm("msr control,%0" : : "r" (control));
+}
+
 #endif /* _AO_ARCH_FUNCS_H_ */