From d6c95a111c0950757d75496af254e3427e3769b6 Mon Sep 17 00:00:00 2001 From: Vegard Storheil Eriksen Date: Sat, 16 Apr 2022 20:59:36 +0200 Subject: async: Add preliminary time scheduler. --- cortex_m/critical_section.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 cortex_m/critical_section.h (limited to 'cortex_m') diff --git a/cortex_m/critical_section.h b/cortex_m/critical_section.h new file mode 100644 index 0000000..6b611a8 --- /dev/null +++ b/cortex_m/critical_section.h @@ -0,0 +1,21 @@ +#pragma once + +#include + +struct critical_section { + uint32_t primask; + + critical_section() { + asm volatile("mrs %0, primask" : "=r" (primask)); + + asm volatile("cpsid i"); + + asm volatile("dmb"); + } + + ~critical_section() { + asm volatile("dmb"); + + asm volatile("msr primask, %0" :: "r" (primask)); + } +}; -- cgit v1.2.3