X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=rpikern;a=blobdiff_plain;f=src%2Fstartup.s;h=84e7e94d0b4037cec5229b228900e0f530504cec;hp=587ab95ea08c275fe7c1388a63afb97e4ef73c0d;hb=38a008b8d1a3a20c401397b4e132fb578e5f0c10;hpb=d80ebb8add60dd01b37d21c21a1a9d971f0f9dce

diff --git a/src/startup.s b/src/startup.s
index 587ab95..84e7e94 100644
--- a/src/startup.s
+++ b/src/startup.s
@@ -5,13 +5,35 @@
 
 	.global startup
 startup:
+	cpsid if
+
 	@ stop all but one of the cores
 	mrc p15, 0, r0, c0, c0, 5
 	ands r0, r0, #0xff
 	bne exit
 
-	@ setup stack
-	ldr sp, =_stacktop
+	@ detect if we're running in hyp mode, and drop to svc
+	mrs r0, cpsr
+	and r1, r0, #0x1f
+	cmp r1, #0x1a
+	bne hypend
+
+	bic r0, #0x1f
+	orr r0, #0x13
+	@msr spsr_cxsf, r0
+	add r0, pc, #4
+	msr elr_hyp, r0
+	@eret
+	mov pc, r0
+hypend:
+
+	@ setup initial stacks, allow 4k stack for IRQs
+	@mov r0, #0x12	@ switch to IRQ mode
+	@msr cpsr, r0
+	@ldr sp, =_stacktop
+	@mov r0, #0x13	@ switch to supervisor mode
+	@msr cpsr, r0
+	ldr sp, =_stacktop - 4096
 
 	@ clear bss
 	ldr r0, =_bss_start