Michael Brown
302f1eeb80
Allow the active timer (providing udelay() and currticks()) to be selected at runtime based on probing during the INIT_EARLY stage of initialisation. TICKS_PER_SEC is now a fixed compile-time constant for all builds, and is independent of the underlying clock tick rate. We choose the value 1024 to allow multiplications and divisions on seconds to be converted to bit shifts. TICKS_PER_MS is defined as 1, allowing multiplications and divisions on milliseconds to be omitted entirely. The 2% inaccuracy in this definition is negligible when using the standard BIOS timer (running at around 18.2Hz). TIMER_RDTSC now checks for a constant TSC before claiming to be a usable timer. (This timer can be tested in KVM via the command-line option "-cpu host,+invtsc".) Signed-off-by: Michael Brown <mcb30@ipxe.org>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
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* Copyright (C) 2009 Daniel Verkamp <daniel@drv.nu>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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 any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* March-19-2009 @ 02:44: Added sleep command.
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* Shao Miller <shao.miller@yrdsb.edu.on.ca>.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ipxe/command.h>
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#include <ipxe/parseopt.h>
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#include <ipxe/timer.h>
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/** @file
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*
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* Time commands
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*
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*/
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/** "time" options */
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struct time_options {};
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/** "time" option list */
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static struct option_descriptor time_opts[] = {};
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/** "time" command descriptor */
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static struct command_descriptor time_cmd =
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COMMAND_DESC ( struct time_options, time_opts, 1, MAX_ARGUMENTS,
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"<command>" );
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/**
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* "time" command
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*
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* @v argc Argument count
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* @v argv Argument list
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* @ret rc Return status code
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*/
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static int time_exec ( int argc, char **argv ) {
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struct time_options opts;
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unsigned long start;
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unsigned long elapsed;
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int decisecs;
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int rc;
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/* Parse options */
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if ( ( rc = parse_options ( argc, argv, &time_cmd, &opts ) ) != 0 )
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return rc;
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start = currticks();
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rc = execv ( argv[1], argv + 1 );
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elapsed = ( currticks() - start );
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decisecs = ( 10 * elapsed / TICKS_PER_SEC );
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printf ( "%s: %d.%ds\n", argv[0],
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( decisecs / 10 ), ( decisecs % 10 ) );
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return rc;
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}
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/** "time" command */
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struct command time_command __command = {
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.name = "time",
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.exec = time_exec,
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};
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