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https://github.com/ApacheThunder/GBA-Exploader.git
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f9251ba0ce
* Implemented unused second SRAM bank for SuperCards for storing GBA-Exploader metadata. Note that game patches are not yet updated for this so games like Pokémon can't use it yet.
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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io_m3_common.h
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Routines common to all version of the Super Card
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "io_sc_common.h"
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#ifndef NULL
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#define NULL 0
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#endif
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/*-----------------------------------------------------------------
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_SC_changeMode (was SC_Unlock) (toggling read/write of PSRAM also toggles SRAM bank!)
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Added by MightyMax
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Modified by Chishm
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Modified again by loopy
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1=ram(readonly), 5=ram, 3=SD interface?
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-----------------------------------------------------------------*/
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void _SC_changeMode(u8 mode) {
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vu16 *unlockAddress = (vu16*)0x09FFFFFE;
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*unlockAddress = 0xA55A;
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*unlockAddress = 0xA55A;
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*unlockAddress = mode;
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*unlockAddress = mode;
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}
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void _SC_changeMode16(u16 mode) {
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vu16 *unlockAddress = (vu16*)0x09FFFFFE;
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*unlockAddress = 0xA55A;
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*unlockAddress = 0xA55A;
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*unlockAddress = mode;
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*unlockAddress = mode;
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}
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void twoByteCpy(u16 *dst, const u16 *src, u32 size) {
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if (size == 0 || dst == NULL || src == NULL)return;
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u32 count;
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u16 *dst16; // hword destination
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u8 *src8; // byte source
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// Ideal case: copy by 4x words. Leaves tail for later.
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if (((u32)src|(u32)dst) %4 == 0 && size >= 4) {
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u32 *src32= (u32*)src, *dst32= (u32*)dst;
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count = size/4;
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u32 tmp = count&3;
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count /= 4;
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// Duff's Device, good friend!
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switch(tmp) {
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do { *dst32++ = *src32++;
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case 3: *dst32++ = *src32++;
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case 2: *dst32++ = *src32++;
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case 1: *dst32++ = *src32++;
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case 0: ; } while (count--);
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}
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// Check for tail
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size &= 3;
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if (size == 0)return;
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src8 = (u8*)src32;
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dst16 = (u16*)dst32;
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} else {
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// Unaligned
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u32 dstOfs = (u32)dst&1;
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src8 = (u8*)src;
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dst16 = (u16*)(dst-dstOfs);
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// Head: 1 byte.
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if (dstOfs != 0) {
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*dst16 = (*dst16 & 0xFF) | *src8++<<8;
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dst16++;
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if (--size == 0)return;
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}
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}
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// Unaligned main: copy by 2x byte.
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count = size/2;
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while (count--) {
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*dst16++ = src8[0] | src8[1]<<8;
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src8 += 2;
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}
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// Tail: 1 byte.
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if (size & 1)*dst16 = (*dst16 &~ 0xFF) | *src8;
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} |