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* string/Makefile (distribute): Add pagecopy.h.
* sysdeps/mach/pagecopy.h: New file. * sysdeps/generic/pagecopy.h: New file. * sysdeps/generic/memcpy.c: Include pagecopy.h; call PAGE_COPY_FWD_MAYBE first when word aligned. * sysdeps/generic/memmove.c: Likewise.
This commit is contained in:
Roland McGrath
parent
787126fe16
commit
67a87b936e
@ -1,5 +1,12 @@
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Tue Feb 21 00:10:50 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
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* string/Makefile (distribute): Add pagecopy.h.
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* sysdeps/mach/pagecopy.h: New file.
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* sysdeps/generic/pagecopy.h: New file.
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* sysdeps/generic/memcpy.c: Include pagecopy.h; call
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PAGE_COPY_FWD_MAYBE first when word aligned.
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* sysdeps/generic/memmove.c: Likewise.
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* misc/bsd-compat.c (longjmp, setjmp): Functions removed.
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(getpgrp): Call __getpgid instead of __getpgrp.
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@ -33,7 +33,7 @@ routines := strcat strchr strcmp strcoll strcpy strcspn strdup \
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swab strfry memfrob memmem
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tests := tester testcopy test-ffs
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distribute := memcopy.h
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distribute := memcopy.h pagecopy.h
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include ../Rules
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@ -21,6 +21,7 @@ Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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#include <memcopy.h>
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#include <pagecopy.h>
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PTR
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DEFUN(memcpy, (dstpp, srcpp, len),
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@ -38,10 +39,14 @@ DEFUN(memcpy, (dstpp, srcpp, len),
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len -= (-dstp) % OPSIZ;
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BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
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/* Copy from SRCP to DSTP taking advantage of the known
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alignment of DSTP. Number of bytes remaining is put
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in the third argumnet, i.e. in LEN. This number may
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vary from machine to machine. */
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/* Copy whole pages from SRCP to DSTP by virtual address manipulation,
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as much as possible. */
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PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len);
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/* Copy from SRCP to DSTP taking advantage of the known alignment of
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DSTP. Number of bytes remaining is put in the third argument,
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i.e. in LEN. This number may vary from machine to machine. */
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WORD_COPY_FWD (dstp, srcp, len, len);
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@ -1,6 +1,6 @@
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/* memmove -- copy memory to memory until the specified number of bytes
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has been copied. Overlap is handled correctly.
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Copyright (C) 1991 Free Software Foundation, Inc.
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Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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Contributed by Torbjorn Granlund (tege@sics.se).
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The GNU C Library is free software; you can redistribute it and/or
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@ -21,6 +21,7 @@ Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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#include <memcopy.h>
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#include <pagecopy.h>
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/* All this is so that bcopy.c can #include
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this file after defining some things. */
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@ -55,6 +56,11 @@ DEFUN(memmove, (a1, a2, len),
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len -= (-dstp) % OPSIZ;
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BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
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/* Copy whole pages from SRCP to DSTP by virtual address
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manipulation, as much as possible. */
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PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len);
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/* Copy from SRCP to DSTP taking advantage of the known
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alignment of DSTP. Number of bytes remaining is put
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in the third argumnet, i.e. in LEN. This number may
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74
sysdeps/generic/pagecopy.h
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74
sysdeps/generic/pagecopy.h
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@ -0,0 +1,74 @@
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/* Macros for copying by pages; used in memcpy, memmove. Generic macros.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* This file defines the macro:
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PAGE_COPY_FWD_MAYBE (dstp, srcp, nbytes_left, nbytes)
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which is invoked like WORD_COPY_FWD et al. The pointers should be at
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least word aligned. This will check if virtual copying by pages can and
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should be done and do it if so.
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System-specific pagecopy.h files should define these macros and then
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#include this file:
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PAGE_COPY_THRESHOLD
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-- Minimum size for which virtual copying by pages is worthwhile.
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PAGE_SIZE
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-- Size of a page.
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PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes)
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-- Macro to perform the virtual copy operation.
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The pointers will be aligned to PAGE_SIZE bytes.
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*/
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#if PAGE_COPY_THRESHOLD
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#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \
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do \
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{ \
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if ((nbytes) >= PAGE_COPY_THRESHOLD && \
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PAGE_OFFSET (dstp) == PAGE_OFFSET (srcp)) \
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{ \
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/* The amount to copy is past the threshold for copying \
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pages virtually with kernel VM operations, and the \
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source and destination addresses have the same alignment. */ \
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size_t nbytes_before = PAGE_OFFSET (PAGE_SIZE - PAGE_OFFSET (dstp));\
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if (nbytes_before != 0) \
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{ \
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/* First copy the words before the first page boundary. */ \
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WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \
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nbytes_before -= nbytes_left; \
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nbytes -= nbytes_before; \
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} \
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if (nbytes_before == 0) \
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PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \
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} \
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} while (0)
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/* The page size is always a power of two, so we can avoid modulo division. */
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#define PAGE_OFFSET(n) ((n) & (PAGE_SIZE - 1))
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#else
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#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) /* nada */
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#endif
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36
sysdeps/mach/pagecopy.h
Normal file
36
sysdeps/mach/pagecopy.h
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@ -0,0 +1,36 @@
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/* Macros for copying by pages; used in memcpy, memmove. Mach version.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <mach.h>
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/* Threshold at which vm_copy is more efficient than well-optimized copying
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by words. This parameter should be tuned as necessary. */
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#define PAGE_THRESHOLD (2 * PAGE_SIZE) /* XXX ? */
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#define PAGE_SIZE __vm_page_size
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#define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes) \
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((nbytes_left) = ((nbytes) - \
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(__vm_copy (__mach_task_self (), \
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(vm_address_t) srcp, trunc_page (nbytes), \
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(vm_address_t) dstp) == KERN_SUCCESS \
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? trunc_page (nbytes) \
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: 0)))
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/* Get the generic macro. */
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#include_next <pagecopy.h>
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