Support config option to disable APM BIOS calls.

New option CONFIG_APMBIOS can be used to disable apm.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/apm.c b/src/apm.c
index 4a0f803..2abf504 100644
--- a/src/apm.c
+++ b/src/apm.c
@@ -183,6 +183,11 @@ handle_1553XX(struct bregs *regs)
 void VISIBLE16
 handle_1553(struct bregs *regs)
 {
+    if (! CONFIG_APMBIOS) {
+        set_code_fail(regs, RET_EUNSUPPORTED);
+        return;
+    }
+
     //debug_stub(regs);
     switch (regs->al) {
     case 0x00: handle_155300(regs); break;