f7bb996d92
Getting the little-endian PCI bus working on the big-endian CPU proved to be quite challenging. We let the PCI devices be mapped in the "match byte lanes" address window. This is where they are mapped by the CFE and DMA transfers generated to or from addresses within this window are not subject to automatic byte-swapping. However any access by the driver to memory-mapped pci space is redirected via the "match bit lanes" address window. We get the benefit of automatic byte swapping through this address window and drivers don't need to change to deal with CPU big-endianness.
44 lines
1.8 KiB
C
44 lines
1.8 KiB
C
/*-
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* Copyright (c) 2010 Neelkanth Natu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SB_BUS_SPACE_H_
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#define _SB_BUS_SPACE_H_
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#include <machine/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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uint8_t sb_big_endian_read8(bus_addr_t addr);
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uint16_t sb_big_endian_read16(bus_addr_t addr);
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uint32_t sb_big_endian_read32(bus_addr_t addr);
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void sb_big_endian_write8(bus_addr_t addr, uint8_t val);
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void sb_big_endian_write16(bus_addr_t addr, uint16_t val);
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void sb_big_endian_write32(bus_addr_t addr, uint32_t val);
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#endif
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#endif
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