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- // -*- C++ -*-
- // VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
- // Copyright (C) 1999-2003 Forgotten
- // Copyright (C) 2004 Forgotten and the VBA development team
-
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 2, or(at your option)
- // any later version.
- //
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software Foundation,
- // Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- #ifndef VBA_PORT_H
- #define VBA_PORT_H
-
- // swaps a 16-bit value
- static inline u16 swap16(u16 v)
- {
- return (v<<8)|(v>>8);
- }
-
- // swaps a 32-bit value
- static inline u32 swap32(u32 v)
- {
- return (v<<24)|((v<<8)&0xff0000)|((v>>8)&0xff00)|(v>>24);
- }
-
- #ifdef WORDS_BIGENDIAN
- #if defined(__GNUC__) && defined(__ppc__)
-
- #define READ16LE(base) \
- ({ unsigned short lhbrxResult; \
- __asm__ ("lhbrx %0, 0, %1" : "=r" (lhbrxResult) : "r" (base) : "memory"); \
- lhbrxResult; })
-
- #define READ32LE(base) \
- ({ unsigned long lwbrxResult; \
- __asm__ ("lwbrx %0, 0, %1" : "=r" (lwbrxResult) : "r" (base) : "memory"); \
- lwbrxResult; })
-
- #define WRITE16LE(base, value) \
- __asm__ ("sthbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
-
- #define WRITE32LE(base, value) \
- __asm__ ("stwbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
-
- #else
- #define READ16LE(x) \
- swap16(*((u16 *)(x)))
- #define READ32LE(x) \
- swap32(*((u32 *)(x)))
- #define WRITE16LE(x,v) \
- *((u16 *)x) = swap16((v))
- #define WRITE32LE(x,v) \
- *((u32 *)x) = swap32((v))
- #endif
- #else
- #define READ16LE(x) \
- *((u16 *)x)
- #define READ32LE(x) \
- *((u32 *)x)
- #define WRITE16LE(x,v) \
- *((u16 *)x) = (v)
- #define WRITE32LE(x,v) \
- *((u32 *)x) = (v)
- #endif
-
- #endif
-