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Annotation of hatari/src/uae-cpu/maccess.h, revision 1.1.1.4

1.1.1.3   root        1:  /*
                      2:   * UAE - The Un*x Amiga Emulator - CPU core
                      3:   *
                      4:   * Big endian memory access functions.
1.1       root        5:   *
                      6:   * Copyright 1996 Bernd Schmidt
1.1.1.3   root        7:   *
                      8:   * Adaptation to Hatari by Thomas Huth, Eero Tamminen
                      9:   *
                     10:   * This file is distributed under the GNU Public License, version 2 or at
                     11:   * your option any later version. Read the file gpl.txt for details.
1.1       root       12:   */
                     13: 
1.1.1.2   root       14: #ifndef UAE_MACCESS_H
                     15: #define UAE_MACCESS_H
                     16: 
                     17: 
1.1.1.3   root       18: /* Can the actual CPU access unaligned memory? */
                     19: #ifndef CPU_CAN_ACCESS_UNALIGNED
                     20: # if defined(__i386__) || defined(powerpc) || defined(__mc68020__)
                     21: #  define CPU_CAN_ACCESS_UNALIGNED 1
                     22: # else
                     23: #  define CPU_CAN_ACCESS_UNALIGNED 0
                     24: # endif
                     25: #endif
                     26: 
                     27: 
                     28: /* If the CPU can access unaligned memory, use these accelerated functions: */
                     29: #if CPU_CAN_ACCESS_UNALIGNED
                     30: 
                     31: #include <SDL_endian.h>
                     32: 
                     33: 
1.1.1.4 ! root       34: static inline uae_u32 do_get_mem_long(void *a)
1.1       root       35: {
1.1.1.4 ! root       36:        return SDL_SwapBE32(*(uae_u32 *)a);
1.1       root       37: }
                     38: 
1.1.1.4 ! root       39: static inline uae_u16 do_get_mem_word(void *a)
1.1       root       40: {
1.1.1.4 ! root       41:        return SDL_SwapBE16(*(uae_u16 *)a);
1.1       root       42: }
                     43: 
1.1.1.3   root       44: 
1.1.1.4 ! root       45: static inline void do_put_mem_long(void *a, uae_u32 v)
1.1       root       46: {
1.1.1.4 ! root       47:        *(uae_u32 *)a = SDL_SwapBE32(v);
1.1       root       48: }
                     49: 
1.1.1.4 ! root       50: static inline void do_put_mem_word(void *a, uae_u16 v)
1.1       root       51: {
1.1.1.4 ! root       52:        *(uae_u16 *)a = SDL_SwapBE16(v);
1.1       root       53: }
                     54: 
1.1.1.3   root       55: 
                     56: #else  /* Cpu can not access unaligned memory: */
                     57: 
                     58: 
1.1.1.4 ! root       59: static inline uae_u32 do_get_mem_long(void *a)
1.1       root       60: {
1.1.1.3   root       61:        uae_u8 *b = (uae_u8 *)a;
                     62: 
                     63:        return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];
1.1       root       64: }
                     65: 
1.1.1.4 ! root       66: static inline uae_u16 do_get_mem_word(void *a)
1.1       root       67: {
1.1.1.3   root       68:        uae_u8 *b = (uae_u8 *)a;
                     69: 
                     70:        return (b[0] << 8) | b[1];
1.1       root       71: }
                     72: 
                     73: 
1.1.1.4 ! root       74: static inline void do_put_mem_long(void *a, uae_u32 v)
1.1.1.3   root       75: {
                     76:        uae_u8 *b = (uae_u8 *)a;
                     77: 
                     78:        b[0] = v >> 24;
                     79:        b[1] = v >> 16;    
                     80:        b[2] = v >> 8;
                     81:        b[3] = v;
                     82: }
                     83: 
1.1.1.4 ! root       84: static inline void do_put_mem_word(void *a, uae_u16 v)
1.1.1.3   root       85: {
                     86:        uae_u8 *b = (uae_u8 *)a;
                     87: 
                     88:        b[0] = v >> 8;
                     89:        b[1] = v;
                     90: }
                     91: 
                     92: 
                     93: #endif  /* CPU_CAN_ACCESS_UNALIGNED */
                     94: 
                     95: 
                     96: /* These are same for all architectures: */
                     97: 
                     98: static inline uae_u8 do_get_mem_byte(uae_u8 *a)
                     99: {
                    100:        return *a;
                    101: }
                    102: 
                    103: static inline void do_put_mem_byte(uae_u8 *a, uae_u8 v)
                    104: {
                    105:        *a = v;
                    106: }
1.1       root      107: 
1.1.1.2   root      108: 
                    109: #endif /* UAE_MACCESS_H */

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