forked from Mirror/GodMode9
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
#pragma once
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#include "common.h"
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#define FIRM_MAGIC 'F', 'I', 'R', 'M'
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#define FIRM_MAX_SIZE 0x400000 // 4MB, due to FIRM partition size
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#define ARM11NCCH_OFFSET 0, 0x2A000, 0x2B000, 0x2C000
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#define ARM9BIN_OFFSET 0x800
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// ARM9 entrypoint after decryption - TWL/AGB and NATIVE/SAFE_MODE
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// see: https://github.com/AuroraWright/Luma3DS/blob/master/source/firm.c#L349
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// and: https://github.com/AuroraWright/Luma3DS/blob/master/source/firm.c#L424
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// and: https://github.com/AuroraWright/Luma3DS/blob/master/source/firm.c#L463
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#define ARM9ENTRY_FIX(firm) (((firm)->sections[3].offset) ? 0x801301C : 0x0801B01C)
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#define FIRM_NDMA_CPY 0
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#define FIRM_XDMA_CPY 1
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#define FIRM_CPU_MEMCPY 2
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#define IsInstallableFirm(firm, firm_size) (ValidateFirm(firm, firm_size, true) == 0)
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#define IsBootableFirm(firm, firm_size) (ValidateFirm(firm, firm_size, false) == 0)
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// see: https://www.3dbrew.org/wiki/FIRM#Firmware_Section_Headers
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typedef struct {
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u32 offset;
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u32 address;
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u32 size;
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u32 method;
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u8 hash[0x20];
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} PACKED_STRUCT FirmSectionHeader;
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// see: https://www.3dbrew.org/wiki/FIRM#FIRM_Header
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typedef struct {
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u8 magic[4];
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u8 dec_magic[4];
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u32 entry_arm11;
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u32 entry_arm9;
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u8 reserved0[0x30];
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FirmSectionHeader sections[4];
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u8 signature[0x100];
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} __attribute__((packed, aligned(16))) FirmHeader;
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// see: https://www.3dbrew.org/wiki/FIRM#New_3DS_FIRM
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typedef struct {
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u8 keyX0x15[0x10]; // this is encrypted
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u8 keyY0x150x16[0x10];
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u8 ctr[0x10];
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char size_ascii[0x8];
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u8 reserved[0x8];
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u8 control[0x10];
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u8 k9l[0x10];
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u8 keyX0x16[0x10]; // this is encrypted
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u8 padding[0x190];
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} __attribute__((packed, aligned(16))) FirmA9LHeader;
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u32 ValidateFirmHeader(FirmHeader* header, u32 data_size);
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u32 ValidateFirmA9LHeader(FirmA9LHeader* header);
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u32 ValidateFirm(void* firm, u32 firm_size, bool installable);
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u32 GetFirmSize(FirmHeader* header);
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FirmSectionHeader* FindFirmArm9Section(FirmHeader* firm);
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u32 GetArm9BinarySize(FirmA9LHeader* a9l);
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u32 SetupArm9BinaryCrypto(FirmA9LHeader* header);
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u32 DecryptA9LHeader(FirmA9LHeader* header);
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u32 DecryptFirm(void* data, u32 offset, u32 size, FirmHeader* firm, FirmA9LHeader* a9l);
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u32 DecryptArm9Binary(void* data, u32 offset, u32 size, FirmA9LHeader* a9l);
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u32 DecryptFirmSequential(void* data, u32 offset, u32 size);
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u32 DecryptFirmFull(void* data, u32 size);
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