mirror of
https://github.com/d0k3/GodMode9.git
synced 2025-06-26 13:42:47 +00:00
016eac6982
- maps a regular ARM-style exception vector table instead of using the bootrom vector redirection features a ton of bugs because I'm missing something, it actually manages to boot fb3DS v1.2 and BAX fine, but fails to boot itself
67 lines
1.1 KiB
ArmAsm
67 lines
1.1 KiB
ArmAsm
.section .text.boot
|
|
.align 4
|
|
|
|
#include <arm.h>
|
|
|
|
#define STACK_SZ (8192)
|
|
|
|
.global __boot
|
|
__boot:
|
|
cpsid aif, #SR_SVC_MODE
|
|
|
|
@ Writeback and invalidate all DCache
|
|
@ Invalidate all caches
|
|
@ Data Synchronization Barrier
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c10, 0
|
|
mcr p15, 0, r0, c7, c7, 0
|
|
mcr p15, 0, r0, c7, c10, 4
|
|
|
|
@ Reset control registers
|
|
ldr r0, =0x00054078
|
|
ldr r1, =0x0000000F
|
|
ldr r2, =0x00F00000
|
|
|
|
mcr p15, 0, r0, c1, c0, 0
|
|
mcr p15, 0, r1, c1, c0, 1
|
|
mcr p15, 0, r2, c1, c0, 2
|
|
|
|
@ Get CPU ID
|
|
mrc p15, 0, r12, c0, c0, 5
|
|
ands r12, r12, #3
|
|
|
|
@ Setup stack according to CPU ID
|
|
ldr sp, =(_stack_base + STACK_SZ)
|
|
ldr r0, =STACK_SZ
|
|
mla sp, r0, r12, sp
|
|
|
|
beq corezero_start
|
|
|
|
cmp r12, #MAX_CPU
|
|
blo coresmp_start
|
|
|
|
1:
|
|
wfi
|
|
b 1b
|
|
|
|
corezero_start:
|
|
ldr r0, =__bss_pa
|
|
ldr r1, =__bss_len
|
|
mov r2, #0
|
|
add r1, r0, r1
|
|
.Lclearbss:
|
|
cmp r0, r1
|
|
strlt r2, [r0], #4
|
|
blt .Lclearbss
|
|
|
|
coresmp_start:
|
|
bl SYS_CoreInit
|
|
bl MPCoreMain
|
|
|
|
b __boot
|
|
|
|
.section .bss.stack
|
|
.align 3
|
|
_stack_base:
|
|
.space (MAX_CPU * STACK_SZ)
|