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Add byteswap routines

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This commit is contained in:
gbeauche 2003-09-07 14:19:25 +00:00
parent 505455c8c4
commit 3f9b589eea
1 changed files with 69 additions and 7 deletions
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76
SheepShaver/src/Unix/sysdeps.h
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@ -59,18 +59,28 @@
# endif
#endif
// Define for external components
#define SHEEPSHAVER 1
// Mac and host address space are the same
#define REAL_ADDRESSING 1
// Are we using a PPC emulator or the real thing?
#ifdef __powerpc__
#define EMULATED_PPC 0
#else
#define EMULATED_PPC 1
#endif
#define POWERPC_ROM 1
#if EMULATED_PPC
// Mac ROM is write protected when banked memory is used
#if REAL_ADDRESSING || DIRECT_ADDRESSING
# define ROM_IS_WRITE_PROTECTED 0
# define USE_SCRATCHMEM_SUBTERFUGE 1
#else
# define ROM_IS_WRITE_PROTECTED 1
#endif
#else
// Mac ROM is write protected
#define ROM_IS_WRITE_PROTECTED 1
#define USE_SCRATCHMEM_SUBTERFUGE 0
#endif
// Data types
typedef unsigned char uint8;
typedef signed char int8;
@ -115,6 +125,58 @@ typedef int64 intptr;
#error "Unsupported size of pointer"
#endif
// Helper functions to byteswap data
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif
#ifndef bswap_16
#define bswap_16 generic_bswap_16
#endif
static inline uint16 generic_bswap_16(uint16 x)
{
return ((x & 0xff) << 8) | ((x >> 8) & 0xff);
}
#ifndef bswap_32
#define bswap_32 generic_bswap_32
#endif
static inline uint32 generic_bswap_32(uint32 x)
{
return (((x & 0xff000000) >> 24) |
((x & 0x00ff0000) >> 8) |
((x & 0x0000ff00) << 8) |
((x & 0x000000ff) << 24) );
}
#ifndef bswap_64
#define bswap_64 generic_bswap_64
#endif
static inline uint64 generic_bswap_64(uint64 x)
{
return (((x & UVAL64(0xff00000000000000)) >> 56) |
((x & UVAL64(0x00ff000000000000)) >> 40) |
((x & UVAL64(0x0000ff0000000000)) >> 24) |
((x & UVAL64(0x000000ff00000000)) >> 8) |
((x & UVAL64(0x00000000ff000000)) << 8) |
((x & UVAL64(0x0000000000ff0000)) << 24) |
((x & UVAL64(0x000000000000ff00)) << 40) |
((x & UVAL64(0x00000000000000ff)) << 56) );
}
#ifdef WORDS_BIGENDIAN
static inline uint16 tswap16(uint16 x) { return x; }
static inline uint32 tswap32(uint32 x) { return x; }
static inline uint64 tswap64(uint64 x) { return x; }
#else
static inline uint16 tswap16(uint16 x) { return bswap_16(x); }
static inline uint32 tswap32(uint32 x) { return bswap_32(x); }
static inline uint64 tswap64(uint64 x) { return bswap_64(x); }
#endif
// Time data type for Time Manager emulation
#ifdef HAVE_CLOCK_GETTIME
typedef struct timespec tm_time_t;