5 files changed, 24 insertions, 4 deletions
diff --git a/src/sys/core.c b/src/sys/core.c
index 37cd6a5..97a77c0 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -13,6 +13,7 @@
 #include "../util/status.h"
 #include "../util/time.h"
 
+#define SYS_CORE_C
 #ifndef VERSION
 char* os_info_v = "?";
 #else
diff --git a/src/sys/core.h b/src/sys/core.h
index fa9e1b5..9e25f9d 100644
--- a/src/sys/core.h
+++ b/src/sys/core.h
@@ -1,6 +1,10 @@
 #ifndef SYS_CORE_H
 #define SYS_CORE_H
 
+#ifndef SYS_CORE_C
+extern char* os_info_v;
+#endif
+
 extern unsigned long cntfrq;
 
 static inline unsigned long load32(unsigned long addr)
@@ -41,6 +45,13 @@ static inline void setsp(void* in)
 	asm volatile ("mov sp, %0" :: "r"(in));
 }
 
+static inline void* heap_end(void)
+{
+	unsigned long value;
+	asm volatile ("ldr %0, =__bss_end": "=r"(value));
+	return (void*)value;
+}
+
 enum
 {
 	// The offset for the MMIO area
diff --git a/src/sys/kernel.S b/src/sys/kernel.S
index a691ebf..e0333ca 100644
--- a/src/sys/kernel.S
+++ b/src/sys/kernel.S
@@ -2,12 +2,10 @@
 
 .globl kernel_main
 kernel_main:
-	push {lr}
 	bl sysinit
 kernel_main.loop:
 	wfe
 	b kernel_main.loop
-	pop {lr}
 
 .section ".data"
 .globl cntfrq
@@ -19,3 +17,7 @@ cmdidx:
 .globl cmd
 cmd:
 	.space 2049
+
+.section ".bss.heap"
+mheap:
+	.space 0x100000
diff --git a/src/sys/kernel.h b/src/sys/kernel.h
new file mode 100644
index 0000000..e724513
--- /dev/null
+++ b/src/sys/kernel.h
@@ -0,0 +1,8 @@
+#ifndef SYS_KERNEL_H
+#define SYS_KERNEL_H
+
+extern unsigned long cntfrq;
+extern unsigned long cmdidx;
+extern char cmd[2048];
+
+#endif
diff --git a/src/sys/timer.c b/src/sys/timer.c
index 9419f80..3753561 100644
--- a/src/sys/timer.c
+++ b/src/sys/timer.c
@@ -9,8 +9,6 @@
 /// Cycles Per Second
 #define CPS 10
 
-extern char* os_info_v;
-
 #define SYS_TIMER_C
 static unsigned long exe_cnt = 0;
 struct Mutex exe_cnt_m = {.addr = &exe_cnt, .pid = NULL_PID};