X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=rpikern;a=blobdiff_plain;f=src%2Fstartup.s;h=30e2a6676a7b12c327dc184f7a19a703b1546310;hp=ec157f666db98b0078ce4b386324be47c8f0fc1c;hb=4cdb0feb633bc6181644704cea8f18368b5bcfd1;hpb=e3851fa5fc01560a8ab799046b7cf0d2f35f18e8

diff --git a/src/startup.s b/src/startup.s
index ec157f6..30e2a66 100644
--- a/src/startup.s
+++ b/src/startup.s
@@ -1,8 +1,42 @@
+	.extern main
+
 	.section .startup
+	.code 32
+
+	ldr sp, =_stacktop
+
+	mov r0, #1
+	bl dbgled
+
 	@ clear bss
 	ldr r0, =_bss_start
 	ldr r1, =_bss_size
+	cmp r1, #0
+	beq 1f		@ 0-sized bss, skip clear
 	mov r2, #0
 0:	str r2, [r0], #4
 	subs r1, #4
 	bne 0b
+1:
+	bl main
+
+	mov r0, #0
+	bl dbgled
+
+halt:	wfe
+	b halt
+
+dbgled:
+	ldr r3, =0x3f200000	@ gpio base
+	ldr r2, =0x9000		@ gpio 24 and 25 -> output
+	str r2, [r3, #8]	@ store to GPFSEL2
+	ldr r2, =0x01000000	@ bit 24
+	teq r0, #0
+	streq r2, [r3, #0x1c]	@ GPSET0
+	strne r2, [r3, #0x28]	@ GPCLR0
+	lsl r2, #1
+	strne r2, [r3, #0x1c]	@ GPSET0
+	streq r2, [r3, #0x28]	@ GPCLR0
+	bx lr
+
+@ vi:set filetype=armasm: