kernel/amd64: intr: Add splraise/splx support

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

1 files changed, 14 insertions, 0 deletions

diff --git a/sys/include/arch/amd64/asm.h b/sys/include/arch/amd64/asm.h
index d7334fe..e85dd87 100644
--- a/sys/include/arch/amd64/asm.h
+++ b/sys/include/arch/amd64/asm.h
@@ -85,6 +85,20 @@ amd64_write_cr0(uint64_t val)
 }
 
 static inline uint64_t
+amd64_read_cr8(void)
+{
+    uint64_t cr8;
+    __ASMV("mov %%cr8, %0" : "=r" (cr8) :: "memory");
+    return cr8;
+}
+
+static inline void
+amd64_write_cr8(uint64_t val)
+{
+    __ASMV("mov %0, %%cr8" :: "r" (val) : "memory");
+}
+
+static inline uint64_t
 amd64_read_cr4(void)
 {
     uint64_t cr4;