5c91fb902d
/* * CPUs often take a performance hit when accessing unaligned memory * locations. The actual performance hit varies, it can be small if the * hardware handles it or large if we have to take an exception and fix * it * in software. * * Since an ethernet header is 14 bytes network drivers often end up * with * the IP header at an unaligned offset. The IP header can be aligned by * shifting the start of the packet by 2 bytes. Drivers should do this * with: * * skb_reserve(NET_IP_ALIGN); * * The downside to this alignment of the IP header is that the DMA is * now * unaligned. On some architectures the cost of an unaligned DMA is high * and this cost outweighs the gains made by aligning the IP header. * * Since this trade off varies between architectures, we allow * NET_IP_ALIGN * to be overridden. */ This new function insl_16 allows to read form 32-bit IO and writes to 16-bit aligned memory. This is useful in above described scenario - In particular with the AXIS AX88180 Gigabit Ethernet MAC. Once the device is in 32-bit mode, reads from the RX FIFO always decrements 4bytes. While on the other side the destination address in SDRAM is always 16-bit aligned. If we use skb_reserve(0) the receive buffer is 32-bit aligned but later we hit a unaligned exception in the IP code. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* File: arch/blackfin/kernel/bfin_ksyms.c
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* Based on: none - original work
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <linux/uaccess.h>
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#include <asm/checksum.h>
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#include <asm/cacheflush.h>
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/* platform dependent support */
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EXPORT_SYMBOL(__ioremap);
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EXPORT_SYMBOL(strcmp);
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EXPORT_SYMBOL(strncmp);
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EXPORT_SYMBOL(ip_fast_csum);
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EXPORT_SYMBOL(kernel_thread);
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EXPORT_SYMBOL(__up);
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EXPORT_SYMBOL(__down);
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EXPORT_SYMBOL(__down_trylock);
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EXPORT_SYMBOL(__down_interruptible);
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EXPORT_SYMBOL(is_in_rom);
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/* Networking helper routines. */
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EXPORT_SYMBOL(csum_partial_copy);
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/* The following are special because they're not called
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* explicitly (the C compiler generates them). Fortunately,
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* their interface isn't gonna change any time soon now, so
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* it's OK to leave it out of version control.
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*/
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EXPORT_SYMBOL(strcpy);
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EXPORT_SYMBOL(memcpy);
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EXPORT_SYMBOL(memset);
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EXPORT_SYMBOL(memcmp);
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EXPORT_SYMBOL(memmove);
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EXPORT_SYMBOL(memchr);
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/*
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* libgcc functions - functions that are used internally by the
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* compiler... (prototypes are not correct though, but that
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* doesn't really matter since they're not versioned).
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*/
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extern void __ashldi3(void);
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extern void __ashrdi3(void);
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extern void __smulsi3_highpart(void);
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extern void __umulsi3_highpart(void);
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extern void __divsi3(void);
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extern void __lshrdi3(void);
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extern void __modsi3(void);
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extern void __muldi3(void);
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extern void __udivsi3(void);
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extern void __umodsi3(void);
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/* gcc lib functions */
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EXPORT_SYMBOL(__ashldi3);
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EXPORT_SYMBOL(__ashrdi3);
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EXPORT_SYMBOL(__umulsi3_highpart);
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EXPORT_SYMBOL(__smulsi3_highpart);
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EXPORT_SYMBOL(__divsi3);
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EXPORT_SYMBOL(__lshrdi3);
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EXPORT_SYMBOL(__modsi3);
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EXPORT_SYMBOL(__muldi3);
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EXPORT_SYMBOL(__udivsi3);
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EXPORT_SYMBOL(__umodsi3);
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EXPORT_SYMBOL(outsb);
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EXPORT_SYMBOL(insb);
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EXPORT_SYMBOL(outsw);
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EXPORT_SYMBOL(insw);
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EXPORT_SYMBOL(outsl);
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EXPORT_SYMBOL(insl);
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EXPORT_SYMBOL(insl_16);
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EXPORT_SYMBOL(irq_flags);
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EXPORT_SYMBOL(iounmap);
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EXPORT_SYMBOL(blackfin_dcache_invalidate_range);
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EXPORT_SYMBOL(blackfin_icache_dcache_flush_range);
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EXPORT_SYMBOL(blackfin_icache_flush_range);
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EXPORT_SYMBOL(blackfin_dcache_flush_range);
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EXPORT_SYMBOL(blackfin_dflush_page);
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EXPORT_SYMBOL(csum_partial);
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EXPORT_SYMBOL(__init_begin);
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EXPORT_SYMBOL(__init_end);
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EXPORT_SYMBOL(_ebss_l1);
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EXPORT_SYMBOL(_stext_l1);
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EXPORT_SYMBOL(_etext_l1);
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EXPORT_SYMBOL(_sdata_l1);
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EXPORT_SYMBOL(_ebss_b_l1);
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EXPORT_SYMBOL(_sdata_b_l1);
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