0a7cb3a43c
For a whole lot of configure options, I put #if...#endif around code that
is specific to the option, even in files which are normally only compiled
when the option is on. This allows me to create a MS Visual C++ 6.0
workspace that supports many of these options. The workspace will basically
compile every file all the time, but the code for disabled options will
be commented out by the #if...#endif.
This may one day lead to simplification of the Makefiles and configure
scripts, but for the moment I'm leaving Makefiles and configure scripts
alone.
Affected options:
BX_SUPPORT_APIC (cpu/apic.cc)
BX_SUPPORT_X86_64 (cpu/*64.cc)
BX_DEBUGGER (debug/*)
BX_DISASM (disasm/*)
BX_WITH_nameofgui (gui/*)
BX_SUPPORT_CDROM (iodev/cdrom.cc)
BX_NE2K_SUPPORT (iodev/eth*.cc, iodev/ne2k.cc)
BX_SUPPORT_APIC (iodev/ioapic.cc)
BX_IODEBUG_SUPPORT (iodev/iodebug.cc)
BX_PCI_SUPPORT (iodev/pci*.cc)
BX_SUPPORT_SB16 (iodev/sb*.cc)
Modified Files:
cpu/apic.cc cpu/arith64.cc cpu/ctrl_xfer64.cc
cpu/data_xfer64.cc cpu/fetchdecode64.cc cpu/logical64.cc
cpu/mult64.cc cpu/resolve64.cc cpu/shift64.cc cpu/stack64.cc
debug/Makefile.in debug/crc.cc debug/dbg_main.cc debug/lexer.l
debug/linux.cc debug/parser.c debug/parser.y
disasm/dis_decode.cc disasm/dis_groups.cc gui/amigaos.cc
gui/beos.cc gui/carbon.cc gui/macintosh.cc gui/rfb.cc
gui/sdl.cc gui/term.cc gui/win32.cc gui/wx.cc gui/wxdialog.cc
gui/wxmain.cc gui/x.cc iodev/cdrom.cc iodev/eth.cc
iodev/eth_arpback.cc iodev/eth_fbsd.cc iodev/eth_linux.cc
iodev/eth_null.cc iodev/eth_packetmaker.cc iodev/eth_tap.cc
iodev/eth_tuntap.cc iodev/eth_win32.cc iodev/ioapic.cc
iodev/iodebug.cc iodev/ne2k.cc iodev/pci.cc iodev/pci2isa.cc
iodev/sb16.cc iodev/soundlnx.cc iodev/soundwin.cc
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: crc.cc,v 1.3 2002-11-19 05:47:44 bdenney Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// I grabbed these CRC routines from the following source:
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// http://www.landfield.com/faqs/compression-faq/part1/section-25.html
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//
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// These routines are very useful, so I'm including them in bochs.
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// They are not covered by the license, as they are not my doing.
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// My gratitude to the author for offering them on the 'net.
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//
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// I only changed the u_long to unsigned long, and u_char to unsigned char,
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// and gave the functions prototypes.
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//
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// -Kevin
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//
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// **************************************************************************
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// The following C code (by Rob Warnock <rpw3@sgi.com>) does CRC-32 in
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// BigEndian/BigEndian byte/bit order. That is, the data is sent most
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// significant byte first, and each of the bits within a byte is sent most
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// significant bit first, as in FDDI. You will need to twiddle with it to do
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// Ethernet CRC, i.e., BigEndian/LittleEndian byte/bit order. [Left as an
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// exercise for the reader.]
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//
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// The CRCs this code generates agree with the vendor-supplied Verilog models
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// of several of the popular FDDI "MAC" chips.
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// **************************************************************************
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#include "bochs.h"
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#if BX_DEBUGGER
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unsigned long crc32_table[256];
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/* Initialized first time "crc32()" is called. If you prefer, you can
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* statically initialize it at compile time. [Another exercise.]
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*/
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unsigned long crc32(unsigned char *buf, int len);
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static void init_crc32(void);
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unsigned long crc32(unsigned char *buf, int len)
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{
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unsigned char *p;
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unsigned long crc;
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if (!crc32_table[1]) /* if not already done, */
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init_crc32(); /* build table */
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crc = 0xffffffff; /* preload shift register, per CRC-32 spec */
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for (p = buf; len > 0; ++p, --len)
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crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
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return ~crc; /* transmit complement, per CRC-32 spec */
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}
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/*
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* Build auxiliary table for parallel byte-at-a-time CRC-32.
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*/
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#define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
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void
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init_crc32(void)
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{
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int i, j;
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unsigned long c;
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for (i = 0; i < 256; ++i) {
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for (c = i << 24, j = 8; j > 0; --j)
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c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c << 1);
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crc32_table[i] = c;
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}
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}
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#endif /* if BX_DEBUGGER */
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