1 files changed, 32 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/exception.c b/payloads/libpayload/arch/x86/exception.c
index b562660910..fe50d09c51 100644
--- a/payloads/libpayload/arch/x86/exception.c
+++ b/payloads/libpayload/arch/x86/exception.c
@@ -32,6 +32,8 @@
 #include <libpayload.h>
 #include <stdint.h>
 
+#define IF_FLAG				(1 << 9)
+
 u32 exception_stack[0x400] __attribute__((aligned(8)));
 
 static exception_hook hook;
@@ -182,3 +184,33 @@ void exception_install_hook(exception_hook h)
 	die_if(hook, "Implement support for a list of hooks if you need it.");
 	hook = h;
 }
+
+static uint32_t eflags(void)
+{
+	uint32_t eflags;
+	asm volatile(
+		"pushf\n\t"
+		"pop %0\n\t"
+	: "=rm" (eflags));
+	return eflags;
+}
+
+void enable_interrupts(void)
+{
+	asm volatile (
+		"sti\n"
+		: : : "cc"
+	);
+}
+void disable_interrupts(void)
+{
+	asm volatile (
+		"cli\n"
+		: : : "cc"
+	);
+}
+
+int interrupts_enabled(void)
+{
+	return !!(eflags() & IF_FLAG);
+}