Cleanup to prepare for ARM64 + Metal

lib/libc/SConscript

@@ -25,12 +25,17 @@ src_common = [
 ]
 
 src_amd64 = [
-#    "amd64/entry.S",
     "amd64/syscall.S",
 ]
 
+src_arm64 = [
+    "arm64/syscall.S",
+]
+
 if (env["ARCH"] == "amd64"):
     src.append(src_amd64)
+elif (env["ARCH"] == "arm64"):
+    src.append(src_arm64)
 src.append(src_common)
 
 libc_env.Append(CPPFLAGS = ['-nostdinc'])
@@ -38,6 +43,6 @@ libc_env.Append(CPPPATH = ['#build/include'])
 
 libc_env.StaticLibrary("libc", src)
 libc_env.StaticObject("crt1", "crt1.c")
-libc_env.StaticObject("crti", "crti.S")
-libc_env.StaticObject("crtn", "crtn.S")
+libc_env.StaticObject("crti", "${ARCH}/crti.S")
+libc_env.StaticObject("crtn", "${ARCH}/crtn.S")
 

sys/SConscript

@@ -11,7 +11,6 @@ src_amd64 = [
     "amd64/multiboot.S",
     "amd64/mbentry.c",
     # AMD64
-    "amd64/critical.c",
     "amd64/debug.c",
     "amd64/disasm.c",
     "amd64/ioapic.c",
@@ -28,7 +27,6 @@ src_amd64 = [
     "amd64/time.c",
     "amd64/trap.c",
     "amd64/trapentry.S",
-    "amd64/xmem.c",
     # Devices
     "dev/x86/debugcons.c",
     "dev/x86/ide.c",
@@ -40,6 +38,7 @@ src_amd64 = [
 
 src_common = [
     "kern/copy.c",
+    "kern/critical.c",
     "kern/bufcache.c",
     "kern/cv.c",
     "kern/debug.c",
@@ -65,6 +64,7 @@ src_common = [
     "kern/vfs.c",
     "kern/vfsuio.c",
     "kern/waitchannel.c",
+    "kern/xmem.c",
     "dev/ahci.c",
     "dev/console.c",
     "dev/e1000.c",

sys/kern/critical.c

@@ -27,7 +27,9 @@ Critical_Init()
 void
 Critical_Enter()
 {
-    disable_interrupts();
+    if (lockLevel[CPU()] == 0) {
+	disable_interrupts();
+    }
     lockLevel[CPU()]++;
 }