diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/microblaze/lib/memmove.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/microblaze/lib/memmove.c | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/ANDROID_3.4.5/arch/microblaze/lib/memmove.c b/ANDROID_3.4.5/arch/microblaze/lib/memmove.c deleted file mode 100644 index 2146c375..00000000 --- a/ANDROID_3.4.5/arch/microblaze/lib/memmove.c +++ /dev/null @@ -1,212 +0,0 @@ -/* - * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> - * Copyright (C) 2008-2009 PetaLogix - * Copyright (C) 2007 John Williams - * - * Reasonably optimised generic C-code for memcpy on Microblaze - * This is generic C code to do efficient, alignment-aware memmove. - * - * It is based on demo code originally Copyright 2001 by Intel Corp, taken from - * http://www.embedded.com/showArticle.jhtml?articleID=19205567 - * - * Attempts were made, unsuccessfully, to contact the original - * author of this code (Michael Morrow, Intel). Below is the original - * copyright notice. - * - * This software has been developed by Intel Corporation. - * Intel specifically disclaims all warranties, express or - * implied, and all liability, including consequential and - * other indirect damages, for the use of this program, including - * liability for infringement of any proprietary rights, - * and including the warranties of merchantability and fitness - * for a particular purpose. Intel does not assume any - * responsibility for and errors which may appear in this program - * not any responsibility to update it. - */ - -#include <linux/types.h> -#include <linux/stddef.h> -#include <linux/compiler.h> -#include <linux/module.h> -#include <linux/string.h> - -#ifdef __HAVE_ARCH_MEMMOVE -#ifndef CONFIG_OPT_LIB_FUNCTION -void *memmove(void *v_dst, const void *v_src, __kernel_size_t c) -{ - const char *src = v_src; - char *dst = v_dst; - - if (!c) - return v_dst; - - /* Use memcpy when source is higher than dest */ - if (v_dst <= v_src) - return memcpy(v_dst, v_src, c); - - /* copy backwards, from end to beginning */ - src += c; - dst += c; - - /* Simple, byte oriented memmove. */ - while (c--) - *--dst = *--src; - - return v_dst; -} -#else /* CONFIG_OPT_LIB_FUNCTION */ -void *memmove(void *v_dst, const void *v_src, __kernel_size_t c) -{ - const char *src = v_src; - char *dst = v_dst; - const uint32_t *i_src; - uint32_t *i_dst; - - if (!c) - return v_dst; - - /* Use memcpy when source is higher than dest */ - if (v_dst <= v_src) - return memcpy(v_dst, v_src, c); - - /* The following code tries to optimize the copy by using unsigned - * alignment. This will work fine if both source and destination are - * aligned on the same boundary. However, if they are aligned on - * different boundaries shifts will be necessary. This might result in - * bad performance on MicroBlaze systems without a barrel shifter. - */ - /* FIXME this part needs more test */ - /* Do a descending copy - this is a bit trickier! */ - dst += c; - src += c; - - if (c >= 4) { - unsigned value, buf_hold; - - /* Align the destination to a word boundary. */ - /* This is done in an endian independent manner. */ - - switch ((unsigned long)dst & 3) { - case 3: - *--dst = *--src; - --c; - case 2: - *--dst = *--src; - --c; - case 1: - *--dst = *--src; - --c; - } - - i_dst = (void *)dst; - /* Choose a copy scheme based on the source */ - /* alignment relative to dstination. */ - switch ((unsigned long)src & 3) { - case 0x0: /* Both byte offsets are aligned */ - - i_src = (const void *)src; - - for (; c >= 4; c -= 4) - *--i_dst = *--i_src; - - src = (const void *)i_src; - break; - case 0x1: /* Unaligned - Off by 1 */ - /* Word align the source */ - i_src = (const void *) (((unsigned)src + 4) & ~3); -#ifndef __MICROBLAZEEL__ - /* Load the holding buffer */ - buf_hold = *--i_src >> 24; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold << 8 | value; - buf_hold = value >> 24; - } -#else - /* Load the holding buffer */ - buf_hold = (*--i_src & 0xFF) << 24; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold | ((value & 0xFFFFFF00)>>8); - buf_hold = (value & 0xFF) << 24; - } -#endif - /* Realign the source */ - src = (const void *)i_src; - src += 1; - break; - case 0x2: /* Unaligned - Off by 2 */ - /* Word align the source */ - i_src = (const void *) (((unsigned)src + 4) & ~3); -#ifndef __MICROBLAZEEL__ - /* Load the holding buffer */ - buf_hold = *--i_src >> 16; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold << 16 | value; - buf_hold = value >> 16; - } -#else - /* Load the holding buffer */ - buf_hold = (*--i_src & 0xFFFF) << 16; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold | ((value & 0xFFFF0000)>>16); - buf_hold = (value & 0xFFFF) << 16; - } -#endif - /* Realign the source */ - src = (const void *)i_src; - src += 2; - break; - case 0x3: /* Unaligned - Off by 3 */ - /* Word align the source */ - i_src = (const void *) (((unsigned)src + 4) & ~3); -#ifndef __MICROBLAZEEL__ - /* Load the holding buffer */ - buf_hold = *--i_src >> 8; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold << 24 | value; - buf_hold = value >> 8; - } -#else - /* Load the holding buffer */ - buf_hold = (*--i_src & 0xFFFFFF) << 8; - - for (; c >= 4; c -= 4) { - value = *--i_src; - *--i_dst = buf_hold | ((value & 0xFF000000)>> 24); - buf_hold = (value & 0xFFFFFF) << 8; - } -#endif - /* Realign the source */ - src = (const void *)i_src; - src += 3; - break; - } - dst = (void *)i_dst; - } - - /* simple fast copy, ... unless a cache boundary is crossed */ - /* Finish off any remaining bytes */ - switch (c) { - case 4: - *--dst = *--src; - case 3: - *--dst = *--src; - case 2: - *--dst = *--src; - case 1: - *--dst = *--src; - } - return v_dst; -} -#endif /* CONFIG_OPT_LIB_FUNCTION */ -EXPORT_SYMBOL(memmove); -#endif /* __HAVE_ARCH_MEMMOVE */ |