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comparison kernel/startup_a9.asm @ 375:19eacf4f7270

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Started on memory manager
author Windel Bouwman
date Sun, 23 Mar 2014 15:44:06 +0100
parents 577ed7fb3fe4
children 9667d78ba79e
comparison
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374:72a3b646d543 375:19eacf4f7270
1 1
2
3 interrupt_vector_table:
4 ivt_reset: B start ; 0x0 reset
5 ivt_undef: B undef_handler ; 0x4 undefined instruction
6 ivt_svc: B undef_handler ; 0x08 Supervisor call
7 ivt_prefetch: B undef_handler ; 0x0C prefetch abort
8 ivt_data: B undef_handler ; 0x10 data abort
9 ivt_hyptrap: B undef_handler ; 0x14 not used
10 ivt_irq: B undef_handler ; 0x18 IRQ
11 ivt_fiq: B undef_handler ; 0x18 FIQ
12
13
14 start:
15
16 ; Setup TTBR1 (translation table base register)
17
18 mov r0, 0
19 mcr p15, 0, r0, c2, c0, 1 ; TTBR1
20 mcr p15, 0, r0, c2, c0, 0 ; TTBR0
21
22 ; Prepare the TTBCR (translation table base control register)
23 mov r0, 0x1 ; TBD: why set this to 1?
24 mcr p15, 0, r0, c2, c0, 2
25
26 ; Enable the VMSA (Virtual memory system architecture):
27 mrc p15, 0, r0, c1, c0, 0
28 ; TODO:
29 ; orr r0, r0, 0x1
30 mcr p15, 0, r0, c1, c0, 0
31
32 ; Setup stack:
2 mov sp, 0x30000 33 mov sp, 0x30000
3 BL kernel_start ; Branch to main (this is actually in the interrupt vector) 34 BL kernel_start ; Branch to main (this is actually in the interrupt vector)
4 local_loop: 35 local_loop:
5 B local_loop 36 B local_loop
6 37
38
39 ; Interrupt handlers:
40
41 undef_handler:
42 B undef_handler
7 43
8 ; Called to identify the proc: 44 ; Called to identify the proc:
9 archmem_pfr0: 45 archmem_pfr0:
10 mrc p15, 0, r0, c0, c1, 0 46 mrc p15, 0, r0, c0, c1, 0
11 mov pc, lr 47 mov pc, lr