Wolfgang Denk wd@denx.de wrote on 2010/06/29 14:55:44:
Dear Joakim Tjernlund,
In message <OFEB4E68BC.F6B8C9D0-ONC1257751.0045AE08-C1257751. 0045DA56@transmode.se> you wrote:
I could not come up with a better name... What is "align32wrap" supposed to mean?
mpc5200_memcpy_fromio() resp. mpc5200_memcpy_toio()?
No. It's not only MPC5200, but also MPC521x. It's not I/O in general, but only I/O from the Local Bus. And even then only unaliged read access.
But memcpy_for_unaligned_read_from_local_bus() was too long for me, and memcpy_furflb() too cryptic ;-)
memcpy_align_src()?
Jocke
BTW, perhaps this memcpy I wrote for uClibc long time ago is useful? You can easily change dst or src alignment:
void *memcpy(void *to, const void *from, size_t len) { unsigned long rem, chunks, tmp1, tmp2; unsigned char *tmp_to; unsigned char *tmp_from = (unsigned char *)from;
chunks = len / 8; tmp_from -= 4; tmp_to = to - 4; if (!chunks) goto lessthan8; rem = (unsigned long )tmp_to % 4; if (rem) goto align; copy_chunks: do { /* make gcc to load all data, then store it */ tmp1 = *(unsigned long *)(tmp_from+4); tmp_from += 8; tmp2 = *(unsigned long *)tmp_from; *(unsigned long *)(tmp_to+4) = tmp1; tmp_to += 8; *(unsigned long *)tmp_to = tmp2; } while (--chunks); lessthan8: len = len % 8; if (len >= 4) { tmp_from += 4; tmp_to += 4; *(unsigned long *)(tmp_to) = *(unsigned long *)(tmp_from); len -= 4; } if (!len) return to; tmp_from += 3; tmp_to += 3; do { *++tmp_to = *++tmp_from; } while (--len);
return to; align: /* ???: Do we really need to generate the carry flag here? If not, then: rem -= 4; */ rem = 4 - rem; len -= rem; do { *(tmp_to+4) = *(tmp_from+4); ++tmp_from; ++tmp_to; } while (--rem); chunks = len / 8; if (chunks) goto copy_chunks; goto lessthan8; }