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-rw-r--r--payloads/libpayload/arch/arm/head.S22
1 files changed, 18 insertions, 4 deletions
diff --git a/payloads/libpayload/arch/arm/head.S b/payloads/libpayload/arch/arm/head.S
index c5c96ea38f..788e328322 100644
--- a/payloads/libpayload/arch/arm/head.S
+++ b/payloads/libpayload/arch/arm/head.S
@@ -34,14 +34,25 @@
*/
ENTRY(_entry)
+ /* TODO: disable interrupts */
+
+ /* Clear BSS */
+ mov r12, #0
+ ldr r2, bss_boundaries
+ ldr r3, bss_boundaries + 4
+ cmp r2, r3
+ beq no_bss
+
+ sub r3, #4 /* Account for late condition check. */
+loop:
+ cmp r2, r3
+ str r12, [r2], #4
+ blt loop
+no_bss:
/* Save off the location of the coreboot tables */
ldr r1, 1f
str r0, [r1]
- /* TODO: disable interrupts */
-
- /* TODO: Clear BSS */
-
/* Setup new stack */
ldr sp, 2f
@@ -59,6 +70,9 @@ ENTRY(_entry)
ENDPROC(_entry)
.align 4
+bss_boundaries:
+ .word _edata
+ .word _end
1:
.word cb_header_ptr
2: