Subversion Repositories HelenOS-historic

Rev

Rev 359 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 359 Rev 361
Line 1... Line 1...
1 
/*
 1 
/*
2 
 * Copyright (C) 2001-2004 Jakub Jermar
 2 
 * Copyright (C) 2001-2004 Jakub Jermar
- 
 
 3 
 * Copyright (C) 2005 HelenOS project
3 
 * All rights reserved.
 4 
 * All rights reserved.
4 
 *
 5 
 *
5 
 * Redistribution and use in source and binary forms, with or without
 6 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
 7 
 * modification, are permitted provided that the following conditions
7 
 * are met:
 8 
 * are met:
Line 210... Line 211...
210 
    __asm__ volatile("rdtsc\n" : "=A" (v));
 211 
    __asm__ volatile("rdtsc\n" : "=A" (v));
211 
   
 212 
   
212 
    return v;
 213 
    return v;
213 
}
 214 
}
214 
 
 215 
 
215 
/** Copy memory
 - 
 
216 
 *
 - 
 
217 
 * Copy a given number of bytes (3rd argument)
 - 
 
218 
 * from the memory location defined by 2nd argument
 - 
 
219 
 * to the memory location defined by 1st argument.
 - 
 
220 
 * The memory areas cannot overlap.
 - 
 
221 
 *
 - 
 
222 
 * @param destination
 - 
 
223 
 * @param source
 - 
 
224 
 * @param number of bytes
 - 
 
225 
 * @return destination
 - 
 
226 
 */
 - 
 
227 
static inline void * memcpy(void * dst, const void * src, size_t cnt)
 - 
 
228 
{
 - 
 
229 
    __u32 d0, d1, d2;
 - 
 
230 
   
 - 
 
231 
    __asm__ __volatile__(
 - 
 
232 
        /* copy all full dwords */
 - 
 
233 
        "rep movsl\n\t"
 - 
 
234 
        /* load count again */
 - 
 
235 
        "movl %4, %%ecx\n\t"
 - 
 
236 
        /* ecx = ecx mod 4 */
 - 
 
237 
        "andl $3, %%ecx\n\t"
 - 
 
238 
        /* are there last <=3 bytes? */
 - 
 
239 
        "jz 1f\n\t"
 - 
 
240 
        /* copy last <=3 bytes */
 - 
 
241 
        "rep movsb\n\t"
 - 
 
242 
        /* exit from asm block */
 - 
 
243 
        "1:\n"
 - 
 
244 
        : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 - 
 
245 
        : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src)
 - 
 
246 
        : "memory");
 - 
 
247 
       
 - 
 
248 
    return dst;
 - 
 
249 
}
 - 
 
250 
 
 - 
 
251 
 
 - 
 
252 
#endif
 216 
#endif