1 files changed, 24 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/farcall.c b/contrib/syslinux-4.02/com32/lib/sys/farcall.c
new file mode 100644
index 0000000..988ee6d
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/sys/farcall.c
@@ -0,0 +1,24 @@
+/*
+ * farcall.c
+ */
+
+#include <com32.h>
+
+static inline uint32_t eflags(void)
+{
+    uint32_t v;
+
+    asm volatile("pushfl ; popl %0" : "=rm" (v));
+    return v;
+}
+
+void __farcall(uint16_t cs, uint16_t ip,
+	       const com32sys_t * ireg, com32sys_t * oreg)
+{
+    com32sys_t xreg = *ireg;
+
+    /* Enable interrupts if and only if they are enabled in the caller */
+    xreg.eflags.l = (xreg.eflags.l & ~EFLAGS_IF) | (eflags() & EFLAGS_IF);
+
+    __com32.cs_farcall((cs << 16) + ip, &xreg, oreg);
+}