Move atags support to be ARM arch-specific

arch/arm/kernel/atags.c

@@ -19,6 +19,7 @@
  */
 
 #include <atags.h>
+#include <mmu.h>
 
 extern arch_uint_ptr atags_ptr;
 
@@ -60,3 +61,20 @@ int _atags_mem_region(struct atag **mem_header, int initialize) {
 		return -1;
 	return 0;
 }
+
+int detect_memory() {
+	struct atag *atags;
+	char *lower, *upper;
+
+	if (atags_first_mem_region(&atags)) {
+		return -1;
+	}
+
+	do {
+		lower = (char *)atags->data.mem.start;
+		upper = lower + atags->data.mem.size - 1;
+		declare_memory_region(lower, upper);
+	} while (!atags_next_mem_region(&atags));
+
+	return 0;
+}

arch/arm/kernel/kernel.mk

@@ -3,7 +3,8 @@ SUBDIRS :=
 
 include $(BASEDIR)/header.mk
 
-OBJS_$(d) := $(d)/mmu.o
+OBJS_$(d) := $(d)/atags.o \
+	$(d)/mmu.o
 
 KOBJS += $(OBJS_$(d))
 

kernel/init.c

@@ -18,7 +18,6 @@
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <atags.h>
 #include <console.h>
 #include <framebuffer.h>
 #include <kmalloc.h>
@@ -94,11 +93,9 @@ void serial_console_init() {
 //once, and only here
 void serial_init();
 void kmalloc_init();
+int detect_memory();
 
 int main(void) {
-	char *lower, *upper;
-	struct atag *atags;
-
 	//setup MMU
 	mmu_reinit();
 
@@ -114,19 +111,11 @@ int main(void) {
 	//setup memory subsystems
 	mm_init();
 	kmalloc_init();
-
-	if (atags_first_mem_region(&atags)) {
-		print("Error: atags must contain at least one memory region\n");
+	if (detect_memory()) {
+		print("Error: Failed to detect memory.\n");
 		return -1;
 	}
 
-	do {
-		lower = (char *)atags->data.mem.start;
-		upper = lower + atags->data.mem.size - 1;
-		print("atags: physical memory at %x-%x\n", lower, upper);
-		declare_memory_region(lower, upper);
-	} while (!atags_next_mem_region(&atags));
-
 	init_initcalls();
 
 	video_console_init();

kernel/kernel.mk

@@ -3,8 +3,7 @@ SUBDIRS :=
 
 include $(BASEDIR)/header.mk
 
-OBJS_$(d) := $(d)/atags.o \
-	$(d)/console.o \
+OBJS_$(d) := $(d)/console.o \
 	$(d)/font.o \
 	$(d)/framebuffer.o \
 	$(d)/init.o \