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[Core/CD] optimized accesses to CDC RAM on little-endian platforms
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@ -1,8 +1,8 @@
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/***************************************************************************************
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* Genesis Plus
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* CD data controller (LC89510 compatible)
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* CD data controller (LC8951x compatible)
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*
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* Copyright (C) 2012-2015 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -639,13 +639,8 @@ unsigned short cdc_host_r(void)
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/* check if data is available */
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if (scd.regs[0x04>>1].byte.h & 0x40)
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{
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/* read data word from CDC RAM buffer */
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uint16 data = *(uint16 *)(cdc.ram + (cdc.dac.w & 0x3ffe));
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#ifdef LSB_FIRST
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/* source data is stored in big endian format */
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data = ((data >> 8) | (data << 8)) & 0xffff;
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#endif
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/* read 16-bit word from CDC RAM buffer (big-endian format) */
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uint16 data = READ_WORD(cdc.ram, cdc.dac.w & 0x3ffe);
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#ifdef LOG_CDC
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error("CDC host read 0x%04x -> 0x%04x (dbc=0x%x) (%X)\n", cdc.dac.w, data, cdc.dbc.w, s68k.pc);
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@ -1,8 +1,8 @@
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/***************************************************************************************
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* Genesis Plus
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* CD data controller (LC89510 compatible)
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* CD data controller (LC8951x compatible)
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*
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* Copyright (C) 2012-2015 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -2,7 +2,7 @@
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* Genesis Plus
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* CD graphics processor
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*
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* Copyright (C) 2012 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -60,13 +60,8 @@ void word_ram_0_dma_w(unsigned int words)
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/* DMA transfer */
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while (words--)
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{
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/* read 16-bit word from CDC buffer */
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data = *(uint16 *)(cdc.ram + src_index);
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#ifdef LSB_FIRST
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/* source data is stored in big endian format */
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data = ((data >> 8) | (data << 8)) & 0xffff;
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#endif
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/* read 16-bit word from CDC RAM buffer (big-endian format) */
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data = READ_WORD(cdc.ram, src_index);
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/* write 16-bit word to WORD-RAM */
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*(uint16 *)(scd.word_ram[0] + dst_index) = data ;
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@ -98,13 +93,8 @@ void word_ram_1_dma_w(unsigned int words)
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/* DMA transfer */
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while (words--)
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{
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/* read 16-bit word from CDC buffer */
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data = *(uint16 *)(cdc.ram + src_index);
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#ifdef LSB_FIRST
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/* source data is stored in big endian format */
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data = ((data >> 8) | (data << 8)) & 0xffff;
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#endif
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/* read 16-bit word from CDC RAM buffer (big-endian format) */
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data = READ_WORD(cdc.ram, src_index);
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/* write 16-bit word to WORD-RAM */
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*(uint16 *)(scd.word_ram[1] + dst_index) = data ;
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@ -136,13 +126,8 @@ void word_ram_2M_dma_w(unsigned int words)
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/* DMA transfer */
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while (words--)
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{
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/* read 16-bit word from CDC buffer */
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data = *(uint16 *)(cdc.ram + src_index);
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#ifdef LSB_FIRST
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/* source data is stored in big endian format */
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data = ((data >> 8) | (data << 8)) & 0xffff;
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#endif
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/* read 16-bit word from CDC RAM buffer (big-endian format) */
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data = READ_WORD(cdc.ram, src_index);
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/* write 16-bit word to WORD-RAM */
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*(uint16 *)(scd.word_ram_2M + dst_index) = data ;
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@ -2,7 +2,7 @@
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* Genesis Plus
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* CD graphics processor
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*
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* Copyright (C) 2012 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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@ -101,13 +101,8 @@ void prg_ram_dma_w(unsigned int words)
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/* DMA transfer */
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while (words--)
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{
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/* read 16-bit word from CDC buffer */
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data = *(uint16 *)(cdc.ram + src_index);
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#ifdef LSB_FIRST
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/* source data is stored in big endian format */
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data = ((data >> 8) | (data << 8)) & 0xffff;
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#endif
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/* read 16-bit word from CDC RAM buffer (big-endian format) */
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data = READ_WORD(cdc.ram, src_index);
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/* write 16-bit word to PRG-RAM */
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*(uint16 *)(scd.prg_ram + dst_index) = data ;
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