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comparison src/entry.S @ 0:83c23a36980d

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Init
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Fri, 26 May 2017 23:11:05 +0900
parents
children 1d371d93ab4f
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-1:000000000000 0:83c23a36980d
1 #include "arm.h"
2 #include "memlayout.h"
3
4 .text
5 .code 32
6
7 .global _start
8
9 _start:
10 # clear the entry bss section, the svc stack, and kernel page table
11 LDR r1, =edata_entry
12 LDR r2, =end_entry
13 MOV r3, #0x00
14
15 1:
16 CMP r1, r2
17 STMLTIA r1!, {r3}
18 BLT 1b
19
20 # initialize stack pointers for svc modes
21 MSR CPSR_cxsf, #(SVC_MODE|NO_INT)
22 LDR sp, =svc_stktop
23
24 BL start
25 B .
26
27 # during startup, kernel stack uses user address, now switch it to kernel addr
28 .global jump_stack
29 jump_stack:
30 MOV r0, sp
31 ADD r0, r0, #KERNBASE
32 MOV sp, r0
33 MOV pc, lr