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comparison experiments/qemu_vexpress_a9/startup.s @ 406:b1daa462ee17

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Made kernel run again
author Windel Bouwman
date Fri, 20 Feb 2015 14:25:35 +0100
parents 34ac19044b8a
children
comparison
equal deleted inserted replaced
405:f381cea07fec 406:b1daa462ee17
5 _Reset: 5 _Reset:
6 6
7 _start: 7 _start:
8 LDR sp, =stack_top 8 LDR sp, =stack_top
9 9
10 ldr r2, =0x10009000 10 ldr r2, =0x10009000
11 11 mov r1, #'1'
12 mov r1, #'1' 12 str r1, [r2]
13 str r1, [r2]
14 13
15 // Load TTBR0 and TTBR1 14 // Load TTBR0 and TTBR1
16 ldr r0, =kernel_table0 15 ldr r0, =kernel_table0
17 mcr p15, 0, r0, c2, c0, 1 16 mcr p15, 0, r0, c2, c0, 1
18 mcr p15, 0, r0, c2, c0, 0 17 mcr p15, 0, r0, c2, c0, 0
19 18
20 // Domain 0: 19 // Domain 0:
21 mov r0, #3 20 mov r0, #3
22 mcr p15, 0, r0, c3, c0, 0 21 mcr p15, 0, r0, c3, c0, 0
23 22
40 Maybe the kernel is loaded at 0x60000000, so we need to map that to first 39 Maybe the kernel is loaded at 0x60000000, so we need to map that to first
41 megabyte also... 40 megabyte also...
42 */ 41 */
43 42
44 kernel_table0: 43 kernel_table0:
45 .long 0x00000000 + 0x402 // 0x00000000 # ; Identity map first 1 MB 44 .long 0x00000402 // 0x00000000 # ; Identity map first 1 MB
46 .long 0x10000000 + 0x402 // 0x00100000 # ; second mb mapping to peripherals 45 .long 0x10000402 // 0x00100000 # ; second mb mapping to peripherals
47
48 .rept 0x600 - 2 46 .rept 0x600 - 2
49 .long 0x0 47 .long 0x0
50 .endr 48 .endr
51 .long 0x00000402 // 0x60000000 maps 1 MB to first MB 49 .long 0x00000402 // 0x60000000 maps 1 MB to first MB
52 .rept 0x1000 - 0x601 50 .rept 0x1000 - 0x601