x86-sdi: add dummy cte and vme to compile amtest

am/arch/x86-sdi.mk

@@ -7,6 +7,8 @@ AM_SRCS += sdi/trm.c \
            nemu/common/input.c \
            nemu/common/timer.c \
            nemu/common/video.c \
+           dummy/cte.c \
+           dummy/vme.c \
            dummy/mpe.c \
 
 CFLAGS  += -mstringop-strategy=loop -I$(AM_HOME)/am/src/sdi/include

am/src/dummy/cte.c

+#include <am.h>
+
+int _cte_init(_Context*(*handler)(_Event, _Context*)) {
+  return 0;
+}
+
+_Context* _kcontext(_Area kstack, void (*entry)(void *), void *arg) {
+  return NULL;
+}
+
+void _yield() {
+}
+
+int _intr_read() {
+  return 0;
+}
+
+void _intr_write(int enable) {
+}

am/src/dummy/vme.c

+#include <am.h>
+
+int _vme_init(void* (*pgalloc_f)(size_t), void (*pgfree_f)(void*)) {
+  return 0;
+}
+
+void _protect(_AddressSpace *as) {
+}
+
+void _unprotect(_AddressSpace *as) {
+}
+
+void _map(_AddressSpace *as, void *va, void *pa, int prot) {
+}
+
+_Context* _ucontext(_AddressSpace *as, _Area kstack, void *entry) {
+  return NULL;
+}