Add support for Slot 2 flashcarts using Compact Flash (#84)

- Supercard CF (SUPERCARDCF)
- GBA Media Player CF (MPCF)
- M3 Adapter CF (M3CF)
- Max Media Dock CF (MMCF)

arm9/source/patches/platform/supercardcf/SuperCardCFLoaderPlatform.cpp

@@ -0,0 +1,21 @@
+#include "common.h"
+#include "SuperCardCFLoaderPlatform.h"
+
+#define SC_MODE_REG         (*(vu16*)0x09FFFFFE)
+#define SC_MODE_MAGIC       0xA55A
+
+#define SC_MODE_MEDIA       0x3
+#define SC_MODE_RAM_RO      0x1
+
+static void changeSupercardMode(u8 mode)
+{
+    SC_MODE_REG = SC_MODE_MAGIC;
+    SC_MODE_REG = SC_MODE_MAGIC;
+    SC_MODE_REG = mode;
+    SC_MODE_REG = mode;
+}
+
+void SuperCardCFLoaderPlatform::SetCardLocked(bool locked) const
+{
+    changeSupercardMode(locked ? SC_MODE_RAM_RO : SC_MODE_MEDIA);
+}

arm9/source/patches/platform/supercardcf/SuperCardCFLoaderPlatform.h

@@ -0,0 +1,37 @@
+#pragma once
+#include "common.h"
+#include "SuperCardCFLockUnlockCardPatchCode.h"
+#include "../compactflash-common/CompactFlashCommonLoaderPlatform.h"
+
+/// @brief Implementation of LoaderPlatform for the DATEL line of flashcarts
+class SuperCardCFLoaderPlatform : public CompactFlashCommonLoaderPlatform
+{
+protected:
+    const ICompactFlashLockUnlockPatchCode* CreateLockingPatchCode(
+        PatchCodeCollection& patchCodeCollection, PatchHeap& patchHeap) const override
+    {
+        return patchCodeCollection.GetOrAddSharedPatchCode([&]
+        {
+            return new SuperCardCFLockUnlockCardPatchCode(patchHeap);
+        });
+    }
+
+    void SetCardLocked(bool locked) const override;
+
+    const cf_registers_t& GetCfRegisters() const override
+    {
+        static const cf_registers_t registers
+        {
+            .data           = (vu16*)0x09000000,
+            .altStatus      = (vu16*)0x098C0000,
+            .command        = (vu16*)0x090E0000,
+            .error          = (vu16*)0x09020000,
+            .sectorCount    = (vu16*)0x09040000,
+            .lba1           = (vu16*)0x09060000,
+            .lba2           = (vu16*)0x09080000,
+            .lba3           = (vu16*)0x090A0000,
+            .lba4           = (vu16*)0x090C0000,
+        };
+        return registers;
+    }
+};

arm9/source/patches/platform/supercardcf/SuperCardCFLockUnlockCardPatchCode.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "sections.h"
+#include "patches/PatchCode.h"
+#include "../compactflash-common/ICompactFlashLockUnlockPatchCode.h"
+
+DEFINE_SECTION_SYMBOLS(sccf_lock_unlock);
+
+extern "C" void sccf_lockUnlockCard(bool lock);
+
+class SuperCardCFLockUnlockCardPatchCode : public PatchCode, public ICompactFlashLockUnlockPatchCode
+{
+public:
+    explicit SuperCardCFLockUnlockCardPatchCode(PatchHeap& patchHeap)
+        : PatchCode(SECTION_START(sccf_lock_unlock), SECTION_SIZE(sccf_lock_unlock), patchHeap) { }
+
+    const void* GetLockUnlockFunction() const override
+    {
+        return GetAddressAtTarget((void*)sccf_lockUnlockCard);
+    }
+};

arm9/source/patches/platform/supercardcf/SuperCardCFLockUnlockCardPatchCode.s

@@ -0,0 +1,26 @@
+.cpu arm7tdmi
+.syntax unified
+.thumb
+.section "sccf_lock_unlock", "ax"
+
+.global sccf_lockUnlockCard
+.type sccf_lockUnlockCard, %function
+sccf_lockUnlockCard:
+    cmp r0, #1
+    bne unlock
+@ void sc_change_mode(uint16_t mode);
+sccf_changeMode:
+    push {r1-r3, lr}
+    ldr r2,= 0x09FFFFFE
+    ldr r3,= 0xA55A
+    strh r3, [r2]
+    strh r3, [r2]
+    strh r0, [r2]
+    strh r0, [r2]
+    pop {r1-r3, pc}
+
+unlock:
+    movs r0, #3
+    b sccf_changeMode
+
+.pool