kern: Improve IRQ mask modification on spinlocks

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/sys/arch/amd64/cpu/cpu.c b/sys/arch/amd64/cpu/cpu.c
index 4edc850..d9093fd 100644
--- a/sys/arch/amd64/cpu/cpu.c
+++ b/sys/arch/amd64/cpu/cpu.c
@@ -29,11 +29,21 @@
 
 #include <sys/types.h>
 #include <sys/cdefs.h>
+#include <sys/param.h>
 #include <os/trace.h>
 #include <mu/cpu.h>
 #include <md/msr.h>
 #include <md/lapic.h>
 
+bool
+mu_irq_state(void)
+{
+    uint64_t rflags;
+
+    __asmv("pushfq; pop %0" : "=r" (rflags) :: "memory");
+    return ISSET(rflags, BIT(9)) != 0;
+}
+
 struct cpu_info *
 cpu_self(void)
 {