diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/x86/core/x86_tcpip.c')
| -rw-r--r-- | qemu/roms/ipxe/src/arch/x86/core/x86_tcpip.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/core/x86_tcpip.c b/qemu/roms/ipxe/src/arch/x86/core/x86_tcpip.c deleted file mode 100644 index 88042f5f7..000000000 --- a/qemu/roms/ipxe/src/arch/x86/core/x86_tcpip.c +++ /dev/null @@ -1,173 +0,0 @@ -/* - * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -/** @file - * - * TCP/IP checksum - * - */ - -#include <limits.h> -#include <ipxe/tcpip.h> - -extern char x86_tcpip_loop_end[]; - -/** - * Calculate continued TCP/IP checkum - * - * @v partial Checksum of already-summed data, in network byte order - * @v data Data buffer - * @v len Length of data buffer - * @ret cksum Updated checksum, in network byte order - */ -uint16_t x86_tcpip_continue_chksum ( uint16_t partial, - const void *data, size_t len ) { - unsigned long sum = ( ( ~partial ) & 0xffff ); - unsigned long initial_word_count; - unsigned long loop_count; - unsigned long loop_partial_count; - unsigned long final_word_count; - unsigned long final_byte; - unsigned long discard_S; - unsigned long discard_c; - unsigned long discard_a; - unsigned long discard_r1; - unsigned long discard_r2; - - /* Calculate number of initial 16-bit words required to bring - * the main loop into alignment. (We don't care about the - * speed for data aligned to less than 16 bits, since this - * situation won't occur in practice.) - */ - if ( len >= sizeof ( sum ) ) { - initial_word_count = ( ( -( ( intptr_t ) data ) & - ( sizeof ( sum ) - 1 ) ) >> 1 ); - } else { - initial_word_count = 0; - } - len -= ( initial_word_count * 2 ); - - /* Calculate number of iterations of the main loop. This loop - * processes native machine words (32-bit or 64-bit), and is - * unrolled 16 times. We calculate an overall iteration - * count, and a starting point for the first iteration. - */ - loop_count = ( len / ( sizeof ( sum ) * 16 ) ); - loop_partial_count = - ( ( len % ( sizeof ( sum ) * 16 ) ) / sizeof ( sum ) ); - - /* Calculate number of 16-bit words remaining after the main - * loop completes. - */ - final_word_count = ( ( len % sizeof ( sum ) ) / 2 ); - - /* Calculate whether or not a final byte remains at the end */ - final_byte = ( len & 1 ); - - /* Calculate the checksum */ - __asm__ ( /* Calculate position at which to jump into the - * unrolled loop. - */ - "imul $( -x86_tcpip_loop_step_size ), %4\n\t" - "add %5, %4\n\t" - - /* Clear carry flag before starting checksumming */ - "clc\n\t" - - /* Checksum initial words */ - "jmp 2f\n\t" - "\n1:\n\t" - "lodsw\n\t" - "adcw %w2, %w0\n\t" - "\n2:\n\t" - "loop 1b\n\t" - - /* Main "lods;adc" loop, unrolled x16 */ - "mov %12, %3\n\t" - "jmp *%4\n\t" - "\nx86_tcpip_loop_start:\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "lods%z2\n\tadc %2, %0\n\t" - "\nx86_tcpip_loop_end:\n\t" - "loop x86_tcpip_loop_start\n\t" - ".equ x86_tcpip_loop_step_size, " - " ( ( x86_tcpip_loop_end - x86_tcpip_loop_start ) >> 4 )\n\t" - - /* Checksum remaining whole words */ - "mov %13, %3\n\t" - "jmp 2f\n\t" - "\n1:\n\t" - "lodsw\n\t" - "adcw %w2, %w0\n\t" - "\n2:\n\t" - "loop 1b\n\t" - - /* Checksum final byte if applicable */ - "mov %14, %3\n\t" - "loop 1f\n\t" - "adcb (%1), %b0\n\t" - "adcb $0, %h0\n\t" - "\n1:\n\t" - - /* Fold down to a uint16_t */ - "push %0\n\t" - "popw %w0\n\t" - "popw %w2\n\t" - "adcw %w2, %w0\n\t" -#if ULONG_MAX > 0xffffffffUL /* 64-bit only */ - "popw %w2\n\t" - "adcw %w2, %w0\n\t" - "popw %w2\n\t" - "adcw %w2, %w0\n\t" -#endif /* 64-bit only */ - - /* Consume CF */ - "adcw $0, %w0\n\t" - "adcw $0, %w0\n\t" - - : "=&Q" ( sum ), "=&S" ( discard_S ), "=&a" ( discard_a ), - "=&c" ( discard_c ), "=&r" ( discard_r1 ), - "=&r" ( discard_r2 ) - : "0" ( sum ), "1" ( data ), "2" ( 0 ), - "3" ( initial_word_count + 1 ), "4" ( loop_partial_count ), - "5" ( x86_tcpip_loop_end ), "g" ( loop_count + 1 ), - "g" ( final_word_count + 1 ), "g" ( final_byte ) ); - - return ( ~sum & 0xffff ); -} |