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[timer] Formalise the timer API

Browse Source 
We now have two implementations for the timer API: one using the
time-of-day counter at 40:70 and one using RDTSC.  Both make use of
timer2_udelay().
This commit is contained in:
Michael Brown 2008-10-12 19:56:52 +01:00
parent e6f276ece3
commit 16f1e35775
22 changed files with 386 additions and 284 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
src/arch/i386/core/rdtsc_timer.c Normal file
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@ -0,0 +1,87 @@
/*
* Copyright (C) 2008 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file
*
* RDTSC timer
*
*/
#include <assert.h>
#include <gpxe/timer.h>
#include <gpxe/timer2.h>
/**
* Number of TSC ticks per microsecond
*
* This is calibrated on the first use of the timer.
*/
static unsigned long rdtsc_ticks_per_usec;
/**
* Delay for a fixed number of microseconds
*
* @v usecs Number of microseconds for which to delay
*/
static void rdtsc_udelay ( unsigned long usecs ) {
unsigned long start;
unsigned long elapsed;
/* Sanity guard, since we may divide by this */
if ( ! usecs )
usecs = 1;
start = currticks();
if ( rdtsc_ticks_per_usec ) {
/* Already calibrated; busy-wait until done */
do {
elapsed = ( currticks() - start );
} while ( elapsed < ( usecs * rdtsc_ticks_per_usec ) );
} else {
/* Not yet calibrated; use timer2 and calibrate
* based on result.
*/
timer2_udelay ( usecs );
elapsed = ( currticks() - start );
rdtsc_ticks_per_usec = ( elapsed / usecs );
DBG ( "RDTSC timer calibrated: %ld ticks in %ld usecs "
"(%ld MHz)\n", elapsed, usecs,
( rdtsc_ticks_per_usec << TSC_SHIFT ) );
}
}
/**
* Get number of ticks per second
*
* @ret ticks_per_sec Number of ticks per second
*/
static unsigned long rdtsc_ticks_per_sec ( void ) {
/* Calibrate timer, if not already done */
if ( ! rdtsc_ticks_per_usec )
udelay ( 1 );
/* Sanity check */
assert ( rdtsc_ticks_per_usec != 0 );
return ( rdtsc_ticks_per_usec * 1000 * 1000 );
}
PROVIDE_TIMER ( rdtsc, udelay, rdtsc_udelay );
PROVIDE_TIMER_INLINE ( rdtsc, currticks );
PROVIDE_TIMER ( rdtsc, ticks_per_sec, rdtsc_ticks_per_sec );

22
src/arch/i386/core/i386_timer.c → src/arch/i386/core/timer2.c
View File

@ -12,12 +12,11 @@
*/
#include <stddef.h>
#include <bits/timer2.h>
#include <gpxe/timer.h>
#include <gpxe/timer2.h>
#include <gpxe/io.h>
/* Timers tick over at this rate */
#define TIMER2_TICK_RATE 1193180U
#define TIMER2_TICKS_PER_SEC 1193180U
/* Parallel Peripheral Controller Port B */
#define PPC_PORTB 0x61
@ -52,8 +51,7 @@
#define BINARY_COUNT 0x00
#define BCD_COUNT 0x01
static void load_timer2(unsigned int ticks)
{
static void load_timer2 ( unsigned int ticks ) {
/*
* Now let's take care of PPC channel 2
*
@ -75,15 +73,13 @@ static void load_timer2(unsigned int ticks)
outb(ticks >> 8, TIMER2_PORT);
}
static int timer2_running(void)
{
static int timer2_running ( void ) {
return ((inb(PPC_PORTB) & PPCB_T2OUT) == 0);
}
void i386_timer2_udelay(unsigned int usecs)
{
load_timer2((usecs * TIMER2_TICK_RATE)/USECS_IN_SEC);
while (timer2_running())
;
void timer2_udelay ( unsigned long usecs ) {
load_timer2 ( ( usecs * TIMER2_TICKS_PER_SEC ) / ( 1000 * 1000 ) );
while (timer2_running()) {
/* Do nothing */
}
}

57
src/arch/i386/drivers/timer_bios.c
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@ -1,57 +0,0 @@
/*
* Etherboot routines for PCBIOS firmware.
*
* Body of routines taken from old pcbios.S
*/
#include <gpxe/init.h>
#include <gpxe/timer.h>
#include <stdio.h>
#include <realmode.h>
#include <bios.h>
#include <bits/timer2.h>
/* A bit faster actually, but we don't care. */
#define TIMER2_TICKS_PER_SEC 18
/*
* Use direct memory access to BIOS variables, longword 0040:006C (ticks
* today) and byte 0040:0070 (midnight crossover flag) instead of calling
* timeofday BIOS interrupt.
*/
static tick_t bios_currticks ( void ) {
static int days = 0;
uint32_t ticks;
uint8_t midnight;
/* Re-enable interrupts so that the timer interrupt can occur */
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"nop\n\t"
"nop\n\t"
"cli\n\t" ) : : );
get_real ( ticks, BDA_SEG, 0x006c );
get_real ( midnight, BDA_SEG, 0x0070 );
if ( midnight ) {
midnight = 0;
put_real ( midnight, BDA_SEG, 0x0070 );
days += 0x1800b0;
}
return ( (days + ticks) * (USECS_IN_SEC / TIMER2_TICKS_PER_SEC) );
}
static int bios_ts_init(void)
{
DBG("BIOS timer installed\n");
return 0;
}
struct timer bios_ts __timer ( 02 ) = {
.init = bios_ts_init,
.udelay = i386_timer2_udelay,
.currticks = bios_currticks,
};

69
src/arch/i386/drivers/timer_rdtsc.c
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@ -1,69 +0,0 @@
#include <gpxe/init.h>
#include <gpxe/timer.h>
#include <errno.h>
#include <stdio.h>
#include <bits/cpu.h>
#include <bits/timer2.h>
#include <gpxe/io.h>
#define rdtsc(low,high) \
__asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
#define rdtscll(val) \
__asm__ __volatile__ ("rdtsc" : "=A" (val))
/* Measure how many clocks we get in one microsecond */
static inline uint64_t calibrate_tsc(void)
{
uint64_t rdtsc_start;
uint64_t rdtsc_end;
rdtscll(rdtsc_start);
i386_timer2_udelay(USECS_IN_MSEC);
rdtscll(rdtsc_end);
return (rdtsc_end - rdtsc_start) / USECS_IN_MSEC;
}
static uint32_t clocks_per_usec = 0;
/* We measure time in microseconds. */
static tick_t rdtsc_currticks(void)
{
uint64_t clocks;
/* Read the Time Stamp Counter */
rdtscll(clocks);
return clocks / clocks_per_usec;
}
static int rdtsc_ts_init(void)
{
struct cpuinfo_x86 cpu_info;
get_cpuinfo(&cpu_info);
if (cpu_info.features & X86_FEATURE_TSC) {
clocks_per_usec= calibrate_tsc();
if (clocks_per_usec) {
DBG("RDTSC ticksource installed. CPU running at %ld Mhz\n",
clocks_per_usec);
return 0;
}
}
DBG("RDTSC ticksource not available on this machine.\n");
return -ENODEV;
}
struct timer rdtsc_ts __timer (01) = {
.init = rdtsc_ts_init,
.udelay = generic_currticks_udelay,
.currticks = rdtsc_currticks,
};

1
src/arch/i386/include/bios.h
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@ -5,7 +5,6 @@
#define BDA_FBMS 0x0013
#define BDA_NUM_DRIVES 0x0075
extern unsigned long currticks ( void );
extern void cpu_nap ( void );
#endif /* BIOS_H */

13
src/arch/i386/include/bits/timer.h Normal file
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@ -0,0 +1,13 @@
#ifndef _BITS_TIMER_H
#define _BITS_TIMER_H
/** @file
*
* i386-specific timer API implementations
*
*/
#include <gpxe/bios_timer.h>
#include <gpxe/rdtsc_timer.h>
#endif /* _BITS_TIMER_H */

8
src/arch/i386/include/bits/timer2.h
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@ -1,8 +0,0 @@
#ifndef BITS_TIMER2_H
#define BITS_TIMER2_H
#include <stddef.h>
void i386_timer2_udelay(unsigned int usecs);
#endif

42
src/arch/i386/include/gpxe/bios_timer.h Normal file
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@ -0,0 +1,42 @@
#ifndef _GPXE_BIOS_TIMER_H
#define _GPXE_BIOS_TIMER_H
/** @file
*
* BIOS timer
*
*/
#ifdef TIMER_PCBIOS
#define TIMER_PREFIX_pcbios
#else
#define TIMER_PREFIX_pcbios __pcbios_
#endif
#include <gpxe/timer2.h>
/**
* Delay for a fixed number of microseconds
*
* @v usecs Number of microseconds for which to delay
*/
static inline __always_inline void
TIMER_INLINE ( pcbios, udelay ) ( unsigned long usecs ) {
/* BIOS timer is not high-resolution enough for udelay(), so
* we use timer2
*/
timer2_udelay ( usecs );
}
/**
* Get number of ticks per second
*
* @ret ticks_per_sec Number of ticks per second
*/
static inline __always_inline unsigned long
TIMER_INLINE ( pcbios, ticks_per_sec ) ( void ) {
/* BIOS timer ticks over at 18.2 ticks per second */
return 18;
}
#endif /* _GPXE_BIOS_TIMER_H */

37
src/arch/i386/include/gpxe/rdtsc_timer.h Normal file
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@ -0,0 +1,37 @@
#ifndef _GPXE_RDTSC_TIMER_H
#define _GPXE_RDTSC_TIMER_H
/** @file
*
* RDTSC timer
*
*/
#ifdef TIMER_RDTSC
#define TIMER_PREFIX_rdtsc
#else
#define TIMER_PREFIX_rdtsc __rdtsc_
#endif
/**
* RDTSC values can easily overflow an unsigned long. We discard the
* low-order bits in order to obtain sensibly-scaled values.
*/
#define TSC_SHIFT 8
/**
* Get current system time in ticks
*
* @ret ticks Current time, in ticks
*/
static inline __always_inline unsigned long
TIMER_INLINE ( rdtsc, currticks ) ( void ) {
unsigned long ticks;
__asm__ __volatile__ ( "rdtsc\n\t"
"shrdl %1, %%edx, %%eax\n\t"
: "=a" ( ticks ) : "i" ( TSC_SHIFT ) : "edx" );
return ticks;
}
#endif /* _GPXE_RDTSC_TIMER_H */

12
src/arch/i386/include/gpxe/timer2.h Normal file
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@ -0,0 +1,12 @@
#ifndef _GPXE_TIMER2_H
#define _GPXE_TIMER2_H
/** @file
*
* Timer chip control
*
*/
extern void timer2_udelay ( unsigned long usecs );
#endif /* _GPXE_TIMER2_H */

63
src/arch/i386/interface/pcbios/bios_timer.c Normal file
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@ -0,0 +1,63 @@
/*
* Copyright (C) 2008 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file
*
* BIOS timer
*
*/
#include <gpxe/timer.h>
#include <realmode.h>
#include <bios.h>
/**
* Get current system time in ticks
*
* @ret ticks Current time, in ticks
*
* Use direct memory access to BIOS variables, longword 0040:006C
* (ticks today) and byte 0040:0070 (midnight crossover flag) instead
* of calling timeofday BIOS interrupt.
*/
static unsigned long bios_currticks ( void ) {
static int days = 0;
uint32_t ticks;
uint8_t midnight;
/* Re-enable interrupts so that the timer interrupt can occur */
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"nop\n\t"
"nop\n\t"
"cli\n\t" ) : : );
get_real ( ticks, BDA_SEG, 0x006c );
get_real ( midnight, BDA_SEG, 0x0070 );
if ( midnight ) {
midnight = 0;
put_real ( midnight, BDA_SEG, 0x0070 );
days += 0x1800b0;
}
return ( days + ticks );
}
PROVIDE_TIMER_INLINE ( pcbios, udelay );
PROVIDE_TIMER ( pcbios, currticks, bios_currticks );
PROVIDE_TIMER_INLINE ( pcbios, ticks_per_sec );

1
src/config/defaults/pcbios.h
View File

@ -9,6 +9,7 @@
#define IOAPI_X86
#define PCIAPI_PCBIOS
#define TIMER_PCBIOS
#define CONSOLE_PCBIOS
#endif /* CONFIG_DEFAULTS_PCBIOS_H */

15
src/config/timer.h Normal file
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@ -0,0 +1,15 @@
#ifndef CONFIG_TIMER_H
#define CONFIG_TIMER_H
/** @file
*
* Timer configuration.
*
*/
#include <config/defaults.h>
//#undef TIMER_PCBIOS
//#define TIMER_RDTSC
#endif /* CONFIG_TIMER_H */

6
src/core/monojob.c
View File

@ -63,7 +63,8 @@ struct job_interface monojob = {
int monojob_wait ( const char *string ) {
int key;
int rc;
tick_t last_progress_dot;
unsigned long last_progress_dot;
unsigned long elapsed;
printf ( "%s.", string );
monojob_rc = -EINPROGRESS;
@ -81,7 +82,8 @@ int monojob_wait ( const char *string ) {
break;
}
}
if ( ( currticks() - last_progress_dot ) > TICKS_PER_SEC ) {
elapsed = ( currticks() - last_progress_dot );
if ( elapsed > TICKS_PER_SEC ) {
printf ( "." );
last_progress_dot = currticks();
}

91
src/core/timer.c
View File

@ -1,7 +1,5 @@
/*
* core/timer.c
*
* Copyright (C) 2007 Alexey Zaytsev <alexey.zaytsev@gmail.com>
* Copyright (C) 2008 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
@ -18,96 +16,25 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stddef.h>
#include <assert.h>
#include <gpxe/timer.h>
static struct timer ts_table[0]
__table_start ( struct timer, timers );
static struct timer ts_table_end[0]
__table_end ( struct timer, timers );
/*
* This function may be used in custom timer driver.
*
* This udelay implementation works well if you've got a
* fast currticks().
*/
void generic_currticks_udelay ( unsigned int usecs ) {
tick_t start;
tick_t elapsed;
start = currticks();
do {
/* xxx: Relax the cpu some way. */
elapsed = ( currticks() - start );
} while ( elapsed < usecs );
}
#include <unistd.h>
/**
* Identify timer source
* Delay for a fixed number of milliseconds
*
* @ret timer Timer source
* @v msecs Number of milliseconds for which to delay
*/
static struct timer * timer ( void ) {
static struct timer *ts = NULL;
/* If we have a timer, use it */
if ( ts )
return ts;
/* Scan for a usable timer */
for ( ts = ts_table ; ts < ts_table_end ; ts++ ) {
if ( ts->init() == 0 )
return ts;
}
/* No timer found; we cannot continue */
assert ( 0 );
while ( 1 ) {};
}
/**
* Read current time
*
* @ret ticks Current time, in ticks
*/
tick_t currticks ( void ) {
tick_t ct;
ct = timer()->currticks();
DBG ( "currticks: %ld.%06ld seconds\n",
ct / USECS_IN_SEC, ct % USECS_IN_SEC );
return ct;
}
/**
* Delay
*
* @v usecs Time to delay, in microseconds
*/
void udelay ( unsigned int usecs ) {
timer()->udelay ( usecs );
}
/**
* Delay
*
* @v msecs Time to delay, in milliseconds
*/
void mdelay ( unsigned int msecs ) {
void mdelay ( unsigned long msecs ) {
while ( msecs-- )
udelay ( USECS_IN_MSEC );
udelay ( 1000 );
}
/**
* Delay
* Delay for a fixed number of seconds
*
* @v secs Time to delay, in seconds
* @v secs Number of seconds for which to delay
*/
unsigned int sleep ( unsigned int secs ) {
while ( secs-- )
mdelay ( MSECS_IN_SEC );
mdelay ( 1000 );
return 0;
}

4
src/drivers/net/3c90x.c
View File

@ -497,7 +497,7 @@ a3c90x_transmit(struct nic *nic __unused, const char *d, unsigned int t,
unsigned char status;
unsigned i, retries;
tick_t ct;
unsigned long ct;
for (retries=0; retries < XMIT_RETRIES ; retries++)
{
@ -543,7 +543,7 @@ a3c90x_transmit(struct nic *nic __unused, const char *d, unsigned int t,
ct = currticks();
while (!(inw(INF_3C90X.IOAddr + regCommandIntStatus_w)&0x0004) &&
ct + 10*USECS_IN_MSEC < currticks());
ct + 10*1000 < currticks());
;
if (!(inw(INF_3C90X.IOAddr + regCommandIntStatus_w)&0x0004))

8
src/drivers/net/eepro100.c
View File

@ -407,7 +407,7 @@ static void eepro100_transmit(struct nic *nic, const char *d, unsigned int t, un
} hdr;
unsigned short status;
int s1, s2;
tick_t ct;
unsigned long ct;
status = inw(ioaddr + SCBStatus);
/* Acknowledge all of the current interrupt sources ASAP. */
@ -448,7 +448,7 @@ static void eepro100_transmit(struct nic *nic, const char *d, unsigned int t, un
ct = currticks();
/* timeout 10 ms for transmit */
while (!txfd.status && ct + 10*USECS_IN_MSEC)
while (!txfd.status && ct + 10*1000)
/* Wait */;
s2 = inw (ioaddr + SCBStatus);
@ -608,7 +608,7 @@ static int eepro100_probe ( struct nic *nic, struct pci_device *pci ) {
int read_cmd, ee_size;
int options;
int rx_mode;
tick_t ct;
unsigned long ct;
/* we cache only the first few words of the EEPROM data
be careful not to access beyond this array */
@ -753,7 +753,7 @@ static int eepro100_probe ( struct nic *nic, struct pci_device *pci ) {
whereami ("started TX thingy (config, iasetup).");
ct = currticks();
while (!txfd.status && ct + 10*USECS_IN_MSEC < currticks())
while (!txfd.status && ct + 10*1000 < currticks())
/* Wait */;
/* Read the status register once to disgard stale data */

4
src/drivers/net/epic100.c
View File

@ -309,7 +309,7 @@ epic100_transmit(struct nic *nic, const char *destaddr, unsigned int type,
unsigned short nstype;
unsigned char *txp;
int entry;
tick_t ct;
unsigned long ct;
/* Calculate the next Tx descriptor entry. */
entry = cur_tx % TX_RING_SIZE;
@ -352,7 +352,7 @@ epic100_transmit(struct nic *nic, const char *destaddr, unsigned int type,
ct = currticks();
/* timeout 10 ms for transmit */
while ((le32_to_cpu(tx_ring[entry].status) & (TRING_OWN)) &&
ct + 10*USECS_IN_MSEC < currticks())
ct + 10*1000 < currticks())
/* Wait */;
if ((le32_to_cpu(tx_ring[entry].status) & TRING_OWN) != 0)

14
src/drivers/net/via-rhine.c
View File

@ -784,7 +784,7 @@ ReadMII (int byMIIIndex, int ioaddr)
char byMIIAdrbak;
char byMIICRbak;
char byMIItemp;
tick_t ct;
unsigned long ct;
byMIIAdrbak = inb (byMIIAD);
byMIICRbak = inb (byMIICR);
@ -800,7 +800,7 @@ ReadMII (int byMIIIndex, int ioaddr)
byMIItemp = byMIItemp & 0x40;
ct = currticks();
while (byMIItemp != 0 && ct + 2*USECS_IN_MSEC < currticks())
while (byMIItemp != 0 && ct + 2*1000 < currticks())
{
byMIItemp = inb (byMIICR);
byMIItemp = byMIItemp & 0x40;
@ -825,7 +825,7 @@ WriteMII (char byMIISetByte, char byMIISetBit, char byMIIOP, int ioaddr)
char byMIIAdrbak;
char byMIICRbak;
char byMIItemp;
tick_t ct;
unsigned long ct;
byMIIAdrbak = inb (byMIIAD);
@ -842,7 +842,7 @@ WriteMII (char byMIISetByte, char byMIISetBit, char byMIIOP, int ioaddr)
byMIItemp = byMIItemp & 0x40;
ct = currticks();
while (byMIItemp != 0 && ct + 2*USECS_IN_MSEC < currticks())
while (byMIItemp != 0 && ct + 2*1000 < currticks())
{
byMIItemp = inb (byMIICR);
byMIItemp = byMIItemp & 0x40;
@ -872,7 +872,7 @@ WriteMII (char byMIISetByte, char byMIISetBit, char byMIIOP, int ioaddr)
byMIItemp = byMIItemp & 0x20;
ct = currticks();
while (byMIItemp != 0 && ct + 2*USECS_IN_MSEC < currticks())
while (byMIItemp != 0 && ct + 2*1000 < currticks())
{
byMIItemp = inb (byMIICR);
byMIItemp = byMIItemp & 0x20;
@ -1346,7 +1346,7 @@ rhine_transmit (struct nic *nic,
unsigned char CR1bak;
unsigned char CR0bak;
unsigned int nstype;
tick_t ct;
unsigned long ct;
/*printf ("rhine_transmit\n"); */
@ -1390,7 +1390,7 @@ rhine_transmit (struct nic *nic,
ct = currticks();
/* Wait until transmit is finished or timeout*/
while((tp->tx_ring[entry].tx_status.bits.own_bit !=0) &&
ct + 10*USECS_IN_MSEC < currticks())
ct + 10*1000 < currticks())
;
if(tp->tx_ring[entry].tx_status.bits.terr == 0)

4
src/drivers/net/w89c840.c
View File

@ -112,7 +112,7 @@ static const char *w89c840_version = "driver Version 0.94 - December 12, 2003";
/* Operational parameters that usually are not changed. */
/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT (10*USECS_IN_MSEC)
#define TX_TIMEOUT (10*1000)
#define PKT_BUF_SZ 1536 /* Size of each temporary Rx buffer.*/
@ -486,7 +486,7 @@ static void w89c840_transmit(
/* send the packet to destination */
unsigned entry;
int transmit_status;
tick_t ct;
unsigned long ct;
/* Caution: the write order is important here, set the field
with the "ownership" bits last. */

94
src/include/gpxe/timer.h
View File

@ -1,41 +1,73 @@
#ifndef GPXE_TIMER_H
#define GPXE_TIMER_H
#ifndef _GPXE_TIMER_H
#define _GPXE_TIMER_H
#include <stddef.h>
#include <gpxe/tables.h>
/** @file
*
* gPXE timer API
*
* The timer API provides udelay() for fixed delays, and currticks()
* for a monotonically increasing tick counter.
*/
typedef unsigned long tick_t;
#include <gpxe/api.h>
#include <config/timer.h>
#define MSECS_IN_SEC (1000)
#define USECS_IN_SEC (1000*1000)
#define USECS_IN_MSEC (1000)
/**
* Calculate static inline timer API function name
*
* @v _prefix Subsystem prefix
* @v _api_func API function
* @ret _subsys_func Subsystem API function
*/
#define TIMER_INLINE( _subsys, _api_func ) \
SINGLE_API_INLINE ( TIMER_PREFIX_ ## _subsys, _api_func )
#define TICKS_PER_SEC USECS_IN_SEC
/**
* Provide a timer API implementation
*
* @v _prefix Subsystem prefix
* @v _api_func API function
* @v _func Implementing function
*/
#define PROVIDE_TIMER( _subsys, _api_func, _func ) \
PROVIDE_SINGLE_API ( TIMER_PREFIX_ ## _subsys, _api_func, _func )
extern tick_t currticks ( void );
/**
* Provide a static inline timer API implementation
*
* @v _prefix Subsystem prefix
* @v _api_func API function
*/
#define PROVIDE_TIMER_INLINE( _subsys, _api_func ) \
PROVIDE_SINGLE_API_INLINE ( TIMER_PREFIX_ ## _subsys, _api_func )
extern void generic_currticks_udelay ( unsigned int usecs );
/* Include all architecture-independent I/O API headers */
/** A timer */
struct timer {
/** Initialise timer
*
* @ret rc Return status code
*/
int ( * init ) ( void );
/** Read current time
*
* @ret ticks Current time, in ticks
*/
tick_t ( * currticks ) ( void );
/** Delay
*
* @v usecs Time to delay, in microseconds
*/
void ( * udelay ) ( unsigned int usecs );
};
/* Include all architecture-dependent I/O API headers */
#include <bits/timer.h>
#define __timer( order ) __table ( struct timer, timers, order )
/**
* Delay for a fixed number of microseconds
*
* @v usecs Number of microseconds for which to delay
*/
void udelay ( unsigned long usecs );
#endif /* GPXE_TIMER_H */
/**
* Get current system time in ticks
*
* @ret ticks Current time, in ticks
*/
unsigned long currticks ( void );
/**
* Get number of ticks per second
*
* @ret ticks_per_sec Number of ticks per second
*/
unsigned long ticks_per_sec ( void );
/** Number of ticks per second */
#define TICKS_PER_SEC ( ticks_per_sec() )
#endif /* _GPXE_TIMER_H */

18
src/include/unistd.h
View File

@ -4,7 +4,6 @@
#include <stddef.h>
#include <stdarg.h>
unsigned int sleep ( unsigned int seconds );
extern int execv ( const char *command, char * const argv[] );
/**
@ -22,10 +21,21 @@ extern int execv ( const char *command, char * const argv[] );
rc; \
} )
void udelay(unsigned int usecs);
void mdelay(unsigned int msecs);
/* Pick up udelay() */
#include <gpxe/timer.h>
#define usleep(x) udelay(x)
/*
* sleep() prototype is defined by POSIX.1. usleep() prototype is
* defined by 4.3BSD. udelay() and mdelay() prototypes are chosen to
* be reasonably sensible.
*
*/
extern unsigned int sleep ( unsigned int seconds );
extern void mdelay ( unsigned long msecs );
static inline __always_inline void usleep ( unsigned long usecs ) {
udelay ( usecs );
}
#endif /* _UNISTD_H */