Subversion Repositories HelenOS-historic

Rev

Rev 363 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 363 Rev 419
Line 27... Line 27...
27 
 */
 27 
 */
28 
 
 28 
 
29 
#ifndef __amd64_MEMSTR_H__
 29 
#ifndef __amd64_MEMSTR_H__
30 
#define __amd64_MEMSTR_H__
 30 
#define __amd64_MEMSTR_H__
31 
 
 31 
 
- 
 
 32 
/** Copy memory
- 
 
 33 
 *
- 
 
 34 
 * Copy a given number of bytes (3rd argument)
- 
 
 35 
 * from the memory location defined by 2nd argument
- 
 
 36 
 * to the memory location defined by 1st argument.
- 
 
 37 
 * The memory areas cannot overlap.
- 
 
 38 
 *
- 
 
 39 
 * @param dst Destination
- 
 
 40 
 * @param src Source
- 
 
 41 
 * @param cnt Number of bytes
- 
 
 42 
 * @return Destination
- 
 
 43 
 */
- 
 
 44 
static inline void * memcpy(void * dst, const void * src, size_t cnt)
- 
 
 45 
{
- 
 
 46 
        __native d0, d1, d2;
- 
 
 47 
 
- 
 
 48 
        __asm__ __volatile__(
- 
 
 49 
                "rep movsq\n\t"
- 
 
 50 
                "movq %4, %%rcx\n\t"
- 
 
 51 
                "andq $7, %%rcx\n\t"
- 
 
 52 
                "jz 1f\n\t"
- 
 
 53 
                "rep movsb\n\t"
- 
 
 54 
                "1:\n"
- 
 
 55 
                : "=&c" (d0), "=&D" (d1), "=&S" (d2)
- 
 
 56 
                : "0" ((__native)(cnt / 8)), "g" ((__native)cnt), "1" ((__native) dst), "2" ((__native) src)
- 
 
 57 
                : "memory");
- 
 
 58 
 
- 
 
 59 
        return dst;
- 
 
 60 
}
- 
 
 61 
 
- 
 
 62 
 
- 
 
 63 
/** Compare memory regions for equality
- 
 
 64 
 *
- 
 
 65 
 * Compare a given number of bytes (3rd argument)
- 
 
 66 
 * at memory locations defined by 1st and 2nd argument
- 
 
 67 
 * for equality. If bytes are equal function returns 0.
- 
 
 68 
 *
- 
 
 69 
 * @param src Region 1
- 
 
 70 
 * @param dst Region 2
- 
 
 71 
 * @param cnt Number of bytes
- 
 
 72 
 * @return Zero if bytes are equal, non-zero otherwise
- 
 
 73 
 */
32 
#define memcpy(dst, src, cnt)  __builtin_memcpy((dst), (src), (cnt));
74 
static inline int memcmp(const void * src, const void * dst, size_t cnt)
- 
 
 75 
{
- 
 
 76 
    __native d0, d1, d2;
- 
 
 77 
    __native ret;
- 
 
 78 
   
- 
 
 79 
    __asm__ (
- 
 
 80 
        "repe cmpsb\n\t"
- 
 
 81 
        "je 1f\n\t"
- 
 
 82 
        "movq %3, %0\n\t"
- 
 
 83 
        "addq $1, %0\n\t"
- 
 
 84 
        "1:\n"
- 
 
 85 
        : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)
- 
 
 86 
        : "0" (0), "1" (src), "2" (dst), "3" ((__native)cnt)
- 
 
 87 
    );
- 
 
 88 
   
- 
 
 89 
    return ret;
- 
 
 90 
}
- 
 
 91 
 
- 
 
 92 
/** Fill memory with words
- 
 
 93 
 * Fill a given number of words (2nd argument)
- 
 
 94 
 * at memory defined by 1st argument with the
- 
 
 95 
 * word value defined by 3rd argument.
- 
 
 96 
 *
- 
 
 97 
 * @param dst Destination
- 
 
 98 
 * @param cnt Number of words
- 
 
 99 
 * @param x Value to fill
- 
 
 100 
 */
- 
 
 101 
static inline void memsetw(__address dst, size_t cnt, __u16 x)
- 
 
 102 
{
- 
 
 103 
    __native d0, d1;
- 
 
 104 
   
- 
 
 105 
    __asm__ __volatile__ (
- 
 
 106 
        "rep stosw\n\t"
- 
 
 107 
        : "=&D" (d0), "=&c" (d1), "=a" (x)
- 
 
 108 
        : "0" (dst), "1" ((__native)cnt), "2" (x)
- 
 
 109 
        : "memory"
- 
 
 110 
    );
- 
 
 111 
 
- 
 
 112 
}
- 
 
 113 
 
- 
 
 114 
/** Fill memory with bytes
- 
 
 115 
 * Fill a given number of bytes (2nd argument)
- 
 
 116 
 * at memory defined by 1st argument with the
- 
 
 117 
 * word value defined by 3rd argument.
- 
 
 118 
 *
- 
 
 119 
 * @param dst Destination
- 
 
 120 
 * @param cnt Number of bytes
- 
 
 121 
 * @param x Value to fill
- 
 
 122 
 */
- 
 
 123 
static inline void memsetb(__address dst, size_t cnt, __u8 x)
- 
 
 124 
{
- 
 
 125 
    __native d0, d1;
- 
 
 126 
   
- 
 
 127 
    __asm__ __volatile__ (
- 
 
 128 
        "rep stosb\n\t"
- 
 
 129 
        : "=&D" (d0), "=&c" (d1), "=a" (x)
- 
 
 130 
        : "0" (dst), "1" ((__native)cnt), "2" (x)
- 
 
 131 
        : "memory"
- 
 
 132 
    );
33 
 
 133 
 
34 
extern void memsetw(__address dst, size_t cnt, __u16 x);
 - 
 
35 
extern void memsetb(__address dst, size_t cnt, __u8 x);
 - 
 
36 
extern int memcmp(__address src, __address dst, int cnt);
 - 
 
- 
 
 134 
}
37 
 
 135 
 
38 
#endif
 136 
#endif