diff options
Diffstat (limited to 'xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.c')
| -rw-r--r-- | xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.c b/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.c deleted file mode 100644 index 0500bf6c1..000000000 --- a/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.c +++ /dev/null @@ -1,187 +0,0 @@ - -/**************************************************************************** - - For Alpha Linux, BusToMem() and MemToBus() can be simply memcpy(), BUT: - we need to prevent unaligned operations when accessing DENSE space on the BUS, - as the video memory is mmap'd that way. The below code does this. - -NOTE: we could simply use the "memcpy()" from LIBC here, but that, currently, is - not as fast. - -Thanks to Linus Torvalds for contributing this code. - -****************************************************************************/ - - -#ifdef HAVE_XORG_CONFIG_H -#include <xorg-config.h> -#endif - -#include <X11/X.h> -#include "xf86.h" -#include "xf86Priv.h" -#include "xf86_OSlib.h" - -#ifdef __alpha__ - -#include "compiler.h" - -#define LWORD_CODING (0x60) -#define SPARSE (7) - -static unsigned long __memcpy(unsigned long dest, unsigned long src, int n); - -_X_EXPORT void -xf86BusToMem(unsigned char *dst, unsigned char *src, int len) -{ - __memcpy((unsigned long)dst, (unsigned long)src, len); -} -_X_EXPORT void -xf86MemToBus(unsigned char *dst, unsigned char *src, int len) -{ - if (len == sizeof(int)) - if (!(((long)src | (long)dst) & 3)) - *((unsigned int*)dst) = *((unsigned int*)(src)); - else { - int i; - if (((long)src) & 3) - i = ldl_u((unsigned int*)src); - else - i = *(unsigned int*)src; - if (((long)dst) & 3) - stl_u(i,(unsigned int*)dst); - else - *(unsigned int*)dst = i; - } - else - __memcpy((unsigned long)dst, (unsigned long)src, len); -} - -/* - * linux/arch/alpha/lib/memcpy.c - * - * Copyright (C) 1995 Linus Torvalds, used with his permission. - */ - -/* - * This is a reasonably optimized memcpy() routine. - */ - -/* - * Note that the C code is written to be optimized into good assembly. However, - * at this point gcc is unable to sanely compile "if (n >= 0)", resulting in a - * explicit compare against 0 (instead of just using the proper "blt reg, xx" or - * "bge reg, xx"). I hope alpha-gcc will be fixed to notice this eventually.. - */ - -/* - * This should be done in one go with ldq_u*2/mask/stq_u. Do it - * with a macro so that we can fix it up later.. - */ -#define ALIGN_DEST_TO8(d,s,n) \ - while (d & 7) { \ - if (n <= 0) return; \ - n--; \ - *(char *) d = *(char *) s; \ - d++; s++; \ - } - -/* - * This should similarly be done with ldq_u*2/mask/stq. The destination - * is aligned, but we don't fill in a full quad-word - */ -#define DO_REST(d,s,n) \ - while (n > 0) { \ - n--; \ - *(char *) d = *(char *) s; \ - d++; s++; \ - } - -/* - * This should be done with ldq/mask/stq. The source and destination are - * aligned, but we don't fill in a full quad-word - */ -#define DO_REST_ALIGNED(d,s,n) DO_REST(d,s,n) - -/* - * This does unaligned memory copies. We want to avoid storing to - * an unaligned address, as that would do a read-modify-write cycle. - * We also want to avoid double-reading the unaligned reads. - * - * Note the ordering to try to avoid load (and address generation) latencies. - */ -static __inline__ void __memcpy_unaligned(unsigned long d, unsigned long s, long n) -{ - ALIGN_DEST_TO8(d,s,n); - n -= 8; /* to avoid compare against 8 in the loop */ - if (n >= 0) { - unsigned long low_word, high_word; - __asm__("ldq_u %0,%1":"=r" (low_word):"m" (*(unsigned long *) s)); - do { - unsigned long tmp; - __asm__("ldq_u %0,%1":"=r" (high_word):"m" (*(unsigned long *)(s+8))); - n -= 8; - __asm__("extql %1,%2,%0" - :"=r" (low_word) - :"r" (low_word), "r" (s)); - __asm__("extqh %1,%2,%0" - :"=r" (tmp) - :"r" (high_word), "r" (s)); - s += 8; - *(unsigned long *) d = low_word | tmp; - d += 8; - low_word = high_word; - } while (n >= 0); - } - n += 8; - DO_REST(d,s,n); -} - -/* - * Hmm.. Strange. The __asm__ here is there to make gcc use a integer register - * for the load-store. I don't know why, but it would seem that using a floating - * point register for the move seems to slow things down (very small difference, - * though). - * - * Note the ordering to try to avoid load (and address generation) latencies. - */ -static __inline__ void __memcpy_aligned(unsigned long d, unsigned long s, long n) -{ - ALIGN_DEST_TO8(d,s,n); - n -= 8; - while (n >= 0) { - unsigned long tmp; - __asm__("ldq %0,%1":"=r" (tmp):"m" (*(unsigned long *) s)); - n -= 8; - s += 8; - *(unsigned long *) d = tmp; - d += 8; - } - n += 8; - DO_REST_ALIGNED(d,s,n); -} - -static unsigned long __memcpy(unsigned long dest, unsigned long src, int n) -{ - if (!((dest ^ src) & 7)) { - __memcpy_aligned(dest, src, n); - return dest; - } - __memcpy_unaligned(dest, src, n); - return dest; -} - -#else /* __alpha__ */ - -void -xf86BusToMem(unsigned char *dst, unsigned char *src, int len) -{ - memcpy(dst, src, len); -} -void -xf86MemToBus(unsigned char *dst, unsigned char *src, int len) -{ - memcpy(dst, src, len); -} - -#endif /* __alpha__ */ |