pokeemerald/include/gba/macro.h

#ifndef GUARD_GBA_MACRO_H
#define GUARD_GBA_MACRO_H

#define CPU_FILL(value, dest, size, bit)                                          \
{                                                                                 \
    vu##bit tmp = (vu##bit)(value);                                               \
    CpuSet((void *)&tmp,                                                          \
           dest,                                                                  \
           CPU_SET_##bit##BIT | CPU_SET_SRC_FIXED | ((size)/(bit/8) & 0x1FFFFF)); \
}

#define CpuFill16(value, dest, size) CPU_FILL(value, dest, size, 16)
#define CpuFill32(value, dest, size) CPU_FILL(value, dest, size, 32)

#define CPU_COPY(src, dest, size, bit) CpuSet(src, dest, CPU_SET_##bit##BIT | ((size)/(bit/8) & 0x1FFFFF))

#define CpuCopy16(src, dest, size) CPU_COPY(src, dest, size, 16)
#define CpuCopy32(src, dest, size) CPU_COPY(src, dest, size, 32)

#define CpuFastFill(value, dest, size)                               \
{                                                                    \
    vu32 tmp = (vu32)(value);                                        \
    CpuFastSet((void *)&tmp,                                         \
               dest,                                                 \
               CPU_FAST_SET_SRC_FIXED | ((size)/(32/8) & 0x1FFFFF)); \
}

#define CpuFastFill16(value, dest, size) CpuFastFill(((value) << 16) | (value), (dest), (size))

#define CpuFastFill8(value, dest, size) CpuFastFill(((value) << 24) | ((value) << 16) | ((value) << 8) | (value), (dest), (size))

#define CpuFastCopy(src, dest, size) CpuFastSet(src, dest, ((size)/(32/8) & 0x1FFFFF))

#define DmaSet(dmaNum, src, dest, control)        \
{                                                 \
    vu32 *dmaRegs = (vu32 *)REG_ADDR_DMA##dmaNum; \
    dmaRegs[0] = (vu32)(src);                     \
    dmaRegs[1] = (vu32)(dest);                    \
    dmaRegs[2] = (vu32)(control);                 \
    dmaRegs[2];                                   \
}

#define DMA_FILL(dmaNum, value, dest, size, bit)                                              \
{                                                                                             \
    vu##bit tmp = (vu##bit)(value);                                                           \
    DmaSet(dmaNum,                                                                            \
           &tmp,                                                                              \
           dest,                                                                              \
           (DMA_ENABLE | DMA_START_NOW | DMA_##bit##BIT | DMA_SRC_FIXED | DMA_DEST_INC) << 16 \
         | ((size)/(bit/8)));                                                                 \
}

#define DmaFill16(dmaNum, value, dest, size) DMA_FILL(dmaNum, value, dest, size, 16)
#define DmaFill32(dmaNum, value, dest, size) DMA_FILL(dmaNum, value, dest, size, 32)

// Note that the DMA clear macros cause the DMA control value to be calculated
// at runtime rather than compile time. The size is divided by the DMA transfer
// unit size (2 or 4 bytes) and then combined with the DMA control flags using a
// bitwise OR operation.

#define DMA_CLEAR(dmaNum, dest, size, bit)  \
{                                           \
    vu##bit *_dest = (vu##bit *)(dest);     \
    u32 _size = size;                       \
    DmaFill##bit(dmaNum, 0, _dest, _size);  \
}

#define DmaClear16(dmaNum, dest, size) DMA_CLEAR(dmaNum, dest, size, 16)
#define DmaClear32(dmaNum, dest, size) DMA_CLEAR(dmaNum, dest, size, 32)

#define DMA_COPY(dmaNum, src, dest, size, bit)                                              \
    DmaSet(dmaNum,                                                                          \
           src,                                                                             \
           dest,                                                                            \
           (DMA_ENABLE | DMA_START_NOW | DMA_##bit##BIT | DMA_SRC_INC | DMA_DEST_INC) << 16 \
         | ((size)/(bit/8)))

#define DmaCopy16(dmaNum, src, dest, size) DMA_COPY(dmaNum, src, dest, size, 16)
#define DmaCopy32(dmaNum, src, dest, size) DMA_COPY(dmaNum, src, dest, size, 32)

#define DmaStop(dmaNum)                                         \
{                                                               \
    vu16 *dmaRegs = (vu16 *)REG_ADDR_DMA##dmaNum;               \
    dmaRegs[5] &= ~(DMA_START_MASK | DMA_DREQ_ON | DMA_REPEAT); \
    dmaRegs[5] &= ~DMA_ENABLE;                                  \
    dmaRegs[5];                                                 \
}

#endif // GUARD_GBA_MACRO_H