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

1.1       root        1:  /*
                      2:   * UAE - The Un*x Amiga Emulator - CPU core
                      3:   *
                      4:   * Big endian memory access functions.
                      5:   *
                      6:   * Copyright 1996 Bernd Schmidt
                      7:   *
                      8:   * Adaptation to Hatari by Thomas Huth, Eero Tamminen
                      9:   *
1.1.1.2   root       10:   * This file is distributed under the GNU General Public License, version 2
                     11:   * or at your option any later version. Read the file gpl.txt for details.
1.1       root       12:   */
                     13: 
                     14: #ifndef UAE_MACCESS_H
                     15: #define UAE_MACCESS_H
                     16: 
                     17: 
                     18: /* Can the actual CPU access unaligned memory? */
                     19: #ifndef CPU_CAN_ACCESS_UNALIGNED
1.1.1.4 ! root       20: # if defined(__i386__) || defined(__x86_64__) || defined(__mc68020__) || \
        !            21:      defined(powerpc) || defined(__ppc__) || defined(__ppc64__)
1.1       root       22: #  define CPU_CAN_ACCESS_UNALIGNED 1
                     23: # else
                     24: #  define CPU_CAN_ACCESS_UNALIGNED 0
                     25: # endif
                     26: #endif
                     27: 
1.1.1.4 ! root       28: #define ALIGN_POINTER_TO32(p) ((~(unsigned long)(p)) & 3)
1.1       root       29: 
                     30: /* If the CPU can access unaligned memory, use these accelerated functions: */
                     31: #if CPU_CAN_ACCESS_UNALIGNED
                     32: 
                     33: #include <SDL_endian.h>
                     34: 
                     35: 
                     36: static inline uae_u32 do_get_mem_long(void *a)
                     37: {
                     38:        return SDL_SwapBE32(*(uae_u32 *)a);
                     39: }
                     40: 
                     41: static inline uae_u16 do_get_mem_word(void *a)
                     42: {
                     43:        return SDL_SwapBE16(*(uae_u16 *)a);
                     44: }
                     45: 
                     46: 
                     47: static inline void do_put_mem_long(void *a, uae_u32 v)
                     48: {
                     49:        *(uae_u32 *)a = SDL_SwapBE32(v);
                     50: }
                     51: 
                     52: static inline void do_put_mem_word(void *a, uae_u16 v)
                     53: {
                     54:        *(uae_u16 *)a = SDL_SwapBE16(v);
                     55: }
                     56: 
                     57: 
                     58: #else  /* Cpu can not access unaligned memory: */
                     59: 
                     60: 
                     61: static inline uae_u32 do_get_mem_long(void *a)
                     62: {
                     63:        uae_u8 *b = (uae_u8 *)a;
                     64: 
1.1.1.4 ! root       65:        return ((uae_u32)b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];
1.1       root       66: }
                     67: 
                     68: static inline uae_u16 do_get_mem_word(void *a)
                     69: {
                     70:        uae_u8 *b = (uae_u8 *)a;
                     71: 
                     72:        return (b[0] << 8) | b[1];
                     73: }
                     74: 
                     75: static inline void do_put_mem_long(void *a, uae_u32 v)
                     76: {
                     77:        uae_u8 *b = (uae_u8 *)a;
                     78: 
                     79:        b[0] = v >> 24;
1.1.1.4 ! root       80:        b[1] = v >> 16;
1.1       root       81:        b[2] = v >> 8;
                     82:        b[3] = v;
                     83: }
                     84: 
                     85: static inline void do_put_mem_word(void *a, uae_u16 v)
                     86: {
                     87:        uae_u8 *b = (uae_u8 *)a;
                     88: 
                     89:        b[0] = v >> 8;
                     90:        b[1] = v;
                     91: }
                     92: 
                     93: 
                     94: #endif  /* CPU_CAN_ACCESS_UNALIGNED */
                     95: 
                     96: 
                     97: /* These are same for all architectures: */
                     98: 
                     99: static inline uae_u8 do_get_mem_byte(uae_u8 *a)
                    100: {
                    101:        return *a;
                    102: }
                    103: 
                    104: static inline void do_put_mem_byte(uae_u8 *a, uae_u8 v)
                    105: {
                    106:        *a = v;
                    107: }
                    108: 
                    109: 
1.1.1.3   root      110: #define call_mem_get_func(func, addr) ((*func)(addr))
                    111: #define call_mem_put_func(func, addr, v) ((*func)(addr, v))
                    112: 
                    113: 
1.1       root      114: #endif /* UAE_MACCESS_H */

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