diff options
Diffstat (limited to 'qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c')
-rw-r--r-- | qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c b/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c deleted file mode 100644 index 75a3ef952..000000000 --- a/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c +++ /dev/null @@ -1,55 +0,0 @@ -/* - * (C) Copyright 2010 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * This is a workaround for issues on the MPC5200, where unaligned - * 32-bit-accesses to the local bus will deliver corrupted data. This - * happens for example when trying to use memcpy() from an odd NOR - * flash address; the behaviour can be also seen when using "md" on an - * odd NOR flash address (but there it is not a bug in U-Boot, which - * only shows the behaviour of this processor). - * - * For memcpy(), we test if either the source or the target address - * are not 32 bit aligned, and - if so - if the source address is in - * NOR flash: in this case we perform a byte-wise (slow) then; for - * aligned operations of non-flash areas we use the optimized (fast) - * real __memcpy(). This way we minimize the performance impact of - * this workaround. - * - */ - -#include <common.h> -#include <flash.h> -#include <linux/types.h> - -void *memcpy(void *trg, const void *src, size_t len) -{ - extern void* __memcpy(void *, const void *, size_t); - char *s = (char *)src; - char *t = (char *)trg; - void *dest = (void *)src; - - /* - * Check is source address is in flash: - * If not, we use the fast assembler code - */ - if (((((unsigned long)s & 3) == 0) /* source aligned */ - && /* AND */ - (((unsigned long)t & 3) == 0)) /* target aligned, */ - || /* or */ - (addr2info((ulong)s) == NULL)) { /* source not in flash */ - return __memcpy(trg, src, len); - } - - /* - * Copying from flash, perform byte by byte copy. - */ - while (len-- > 0) - *t++ = *s++; - - return dest; -} |