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Use DTCM for ctrNandWrite's buffer, crt0 changes, reboot patch changes

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This commit is contained in:
TuxSH 2017-05-24 19:52:09 +02:00
parent 10f555b6fb
commit d57d8aaae7
5 changed files with 47 additions and 40 deletions
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8
arm11/source/start.s
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@ -30,7 +30,8 @@ operation:
.word 0
start:
cpsid aif
@ Disable interrupts and switch to supervisor mode
cpsid aif, #0x13
@ Set the control register to reset default: everything disabled
ldr r0, =0x54078
@ -42,11 +43,10 @@ start:
mov r0, #0xF
mcr p15, 0, r0, c1, c0, 1
@ Invalidate all caches, flush the prefetch buffer and DSB
@ Invalidate both caches, flush the prefetch buffer then DSB
mov r0, #0
mcr p15, 0, r0, c7, c5, 4
mcr p15, 0, r0, c7, c5, 0
mcr p15, 0, r0, c7, c6, 0
mcr p15, 0, r0, c7, c7, 0
mcr p15, 0, r0, c7, c10, 4
@ Clear BSS

2
loader/source/start.s
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@ -43,7 +43,7 @@ disableMpuAndJumpToEntrypoints:
mrc p15, 0, r0, c1, c0, 0 @ read control register
bic r0, #(1<<12) @ - instruction cache disable
bic r0, #(1<<2) @ - data cache disable
bic r0, #(1<<0) @ - mpu disable
bic r0, #(1<<0) @ - MPU disable
mcr p15, 0, r0, c1, c0, 0 @ write control register
@ Set the ARM11 entrypoint

22
patches/reboot.s
View File

@ -2,15 +2,17 @@
.arm.little
argv_addr equ 0x27FFDF00
fname_addr equ 0x27FFDF80
low_tid_addr equ 0x27FFDFE0
copy_launch_stub_addr equ 0x27FFE000
copy_launch_stub_stack_top equ 0x01FFB800
copy_launch_stub_stack_bottom equ 0x01FFA800
copy_launch_stub_addr equ 0x01FF9000
argv_addr equ (copy_launch_stub_stack_bottom - 0x100)
fname_addr equ (copy_launch_stub_stack_bottom - 0x200)
low_tid_addr equ (copy_launch_stub_stack_bottom - 0x300)
firm_addr equ 0x20001000
firm_maxsize equ (copy_launch_stub_addr - 0x1000 - firm_addr)
firm_maxsize equ 0x07FFF000
arm11_entrypoint_addr equ 0x1FFFFFFC
.create "build/reboot.bin", 0
.arm
; Interesting registers and locations to keep in mind, set just before this code is ran:
@ -154,17 +156,13 @@ fname: .ascii "FILE"
cmp r5, #3
blo load_section_loop
ldr r0, =arm11_entrypoint_addr
ldr r1, [r4, #0x08]
str r1, [r0]
mov r0, #2 ; argc
ldr r1, =argv_addr ; argv
ldr r2, =0xBABE ; magic word
ldr r5, =arm11_entrypoint_addr
mov r5, #0x20000000
ldr r6, [r4, #0x08]
str r6, [r5]
str r6, [r5, #-4] ; store arm11 entrypoint
ldr lr, [r4, #0x0c]
bx lr

4
source/crypto.c
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@ -379,8 +379,8 @@ int ctrNandRead(u32 sector, u32 sectorCount, u8 *outbuf)
int ctrNandWrite(u32 sector, u32 sectorCount, const u8 *inbuf)
{
u8 *buffer = (u8 *)0x23000000;
u32 bufferSize = 0xF00000;
u8 *buffer = (u8 *)0xFFF00000;
u32 bufferSize = 0x4000;
__attribute__((aligned(4))) u8 tmpCtr[sizeof(nandCtr)];
memcpy(tmpCtr, nandCtr, sizeof(nandCtr));

49
source/start.s
View File

@ -24,10 +24,10 @@
.align 4
.global _start
_start:
@ Disable interrupts
mrs r4, cpsr
@ Disable interrupts and switch to supervisor mode (also clear flags)
mov r4, #0x13
orr r4, #0x1C0
msr cpsr_cx, r4
msr cpsr_cxsf, r4
mov r9, r0
mov r10, r1
@ -38,30 +38,34 @@ _start:
@ Disable caches / MPU
mrc p15, 0, r4, c1, c0, 0 @ read control register
bic r4, #(1<<16) @ - DTCM disable
bic r4, #(1<<12) @ - instruction cache disable
bic r4, #(1<<2) @ - data cache disable
bic r4, #(1<<0) @ - mpu disable
bic r4, #(1<<0) @ - MPU disable
mcr p15, 0, r4, c1, c0, 0 @ write control register
@ Flush caches
bl flushEntireDCache
bl flushEntireICache
@ Invalidate both caches, discarding any data they may contain,
@ then drain the write buffer
mov r4, #0
mcr p15, 0, r4, c7, c5, 0
mcr p15, 0, r4, c7, c6, 0
mcr p15, 0, r4, c7, c10, 4
@ Give read/write access to all the memory regions
ldr r0, =0x3333333
ldr r0, =0x33333333
mcr p15, 0, r0, c5, c0, 2 @ write data access
mcr p15, 0, r0, c5, c0, 3 @ write instruction access
@ Set MPU permissions and cache settings
ldr r0, =0xFFFF001D @ ffff0000 32k | bootrom (unprotected part)
ldr r1, =0x01FF801D @ 01ff8000 32k | itcm
ldr r2, =0x08000029 @ 08000000 2M | arm9 mem (O3DS / N3DS)
ldr r3, =0x10000029 @ 10000000 2M | io mem (ARM9 / first 2MB)
ldr r4, =0x20000037 @ 20000000 256M | fcram (O3DS / N3DS)
ldr r5, =0x1FF00027 @ 1FF00000 1M | dsp / axi wram
ldr r6, =0x1800002D @ 18000000 8M | vram (+ 2MB)
mov r7, #0
mov r8, #0x15
ldr r1, =0xFFF0801B @ fff00000 16k | dtcm
ldr r2, =0x01FF801D @ 01ff8000 32k | itcm
ldr r3, =0x08000029 @ 08000000 2M | arm9 mem (O3DS / N3DS)
ldr r4, =0x10000029 @ 10000000 2M | io mem (ARM9 / first 2MB)
ldr r5, =0x20000037 @ 20000000 256M | fcram (O3DS / N3DS)
ldr r6, =0x1FF00027 @ 1FF00000 1M | dsp / axi wram
ldr r7, =0x1800002D @ 18000000 8M | vram (+ 2MB)
mov r8, #0x29
mcr p15, 0, r0, c6, c0, 0
mcr p15, 0, r1, c6, c1, 0
mcr p15, 0, r2, c6, c2, 0
@ -70,17 +74,22 @@ _start:
mcr p15, 0, r5, c6, c5, 0
mcr p15, 0, r6, c6, c6, 0
mcr p15, 0, r7, c6, c7, 0
mcr p15, 0, r8, c3, c0, 0 @ Write bufferable 0, 2, 4
mcr p15, 0, r8, c2, c0, 0 @ Data cacheable 0, 2, 4
mcr p15, 0, r8, c2, c0, 1 @ Inst cacheable 0, 2, 4
mcr p15, 0, r8, c3, c0, 0 @ Write bufferable 0, 3, 5
mcr p15, 0, r8, c2, c0, 0 @ Data cacheable 0, 3, 5
mcr p15, 0, r8, c2, c0, 1 @ Inst cacheable 0, 3, 5
@ Set DTCM address and size to the default values
ldr r1, =0xFFF0800A @ set DTCM address and size
mcr p15, 0, r1, c9, c1, 0 @ set the dtcm Region Register
@ Enable caches / MPU / ITCM
mrc p15, 0, r0, c1, c0, 0 @ read control register
orr r0, r0, #(1<<18) @ - ITCM enable
orr r0, r0, #(1<<16) @ - DTCM enable
orr r0, r0, #(1<<13) @ - alternate exception vectors enable
orr r0, r0, #(1<<12) @ - instruction cache enable
orr r0, r0, #(1<<2) @ - data cache enable
orr r0, r0, #(1<<0) @ - mpu enable
orr r0, r0, #(1<<0) @ - MPU enable
mcr p15, 0, r0, c1, c0, 0 @ write control register
@ Clear BSS