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comparison kernel/arch/qemu_vexpress/startup_a9.asm @ 381:6df89163e114

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Fix section and ldr pseudo instruction
author Windel Bouwman
date Sat, 26 Apr 2014 17:41:56 +0200
parents kernel/startup_a9.asm@9667d78ba79e
children d056b552d3f4
comparison
equal deleted inserted replaced
380:67a584582aee 381:6df89163e114
1
2 section code
3
4 interrupt_vector_table:
5 ivt_reset: B start ; 0x0 reset
6 ivt_undef: B undef_handler ; 0x4 undefined instruction
7 ivt_svc: B undef_handler ; 0x08 Supervisor call
8 ivt_prefetch: B undef_handler ; 0x0C prefetch abort
9 ivt_data: B undef_handler ; 0x10 data abort
10 ivt_hyptrap: B undef_handler ; 0x14 not used
11 ivt_irq: B undef_handler ; 0x18 IRQ
12 ivt_fiq: B undef_handler ; 0x18 FIQ
13
14
15 start:
16
17 ; Setup TTBR1 (translation table base register)
18
19 ldr r0, =kernel_table0 ; pseudo instruction which loads the value of the symbol
20 ; -KERNEL_BASE
21 mcr p15, 0, r0, c2, c0, 1 ; TTBR1
22 mcr p15, 0, r0, c2, c0, 0 ; TTBR0
23
24 ; Prepare the TTBCR (translation table base control register)
25 mov r0, 0x1 ; TBD: why set this to 1?
26 mcr p15, 0, r0, c2, c0, 2
27
28 ; Enable the VMSA (Virtual memory system architecture):
29 mrc p15, 0, r0, c1, c0, 0
30 ; TODO:
31 ; orr r0, r0, 0x1
32 mcr p15, 0, r0, c1, c0, 0
33
34 ; Setup stack:
35 mov sp, 0x30000
36 BL kernel_start ; Branch to main (this is actually in the interrupt vector)
37 local_loop:
38 B local_loop
39
40
41 ; Interrupt handlers:
42
43 undef_handler:
44 B undef_handler
45
46
47 ; Assembly language helpers:
48 ; Called to identify the proc:
49 arch_pfr0:
50 mrc p15, 0, r0, c0, c1, 0
51 mov pc, lr
52
53 arch_pfr1:
54 mrc p15, 0, r0, c0, c1, 1
55 mov pc, lr
56
57 arch_mmfr0:
58 mrc p15, 0, r0, c0, c1, 4
59 mov pc, lr
60
61
62 arch_mpuir:
63 mrc p15, 0, r0, c0, c0, 4
64 mov pc, lr
65
66
67 ; Memory map tables:
68
69 section mem_tables
70
71 kernel_table0:
72 dcd 0x000402
73