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Introduce the new timer subsystem.

Browse Source 
Timer subsystem initialization code in core/timer.c

	Split the BIOS and RTDSC timer drivers from i386_timer.c

	Split arch/i386/firmware/pcbios/bios.c into the RTSDC
	timer driver and arch/i386/core/nap.c

	Split the headers properly:
		include/unistd.h - delay functions to be used by the
					gPXE core and drivers.

		include/gpxe/timer.h - the fimer subsystem interface
					to be used by the timer drivers
					and currticks() to be used by
					the code gPXE subsystems.

		include/latch.h	- removed
		include/timer.h - scheduled for removal. Some driver
					are using currticks, which is
					only for core subsystems.

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
This commit is contained in:
Alexey Zaytsev
2007-12-01 07:07:01 +03:00
parent 844828cb15
commit 4006d229e5
13 changed files with 384 additions and 296 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
src/include/gpxe/timer.h Normal file
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@@ -0,0 +1,32 @@
#ifndef GPXE_TIMER_H
#define GPXE_TIMER_H
#include <stddef.h>
typedef uint32_t tick_t;
#define MSECS_IN_SEC (1000)
#define USECS_IN_SEC (1000*1000)
#define USECS_IN_MSEC (1000)
#define TICKS_PER_SEC USECS_IN_SEC
tick_t currticks(void);
void generic_currticks_udelay(unsigned int usecs);
struct timer {
/* Returns zero on successful initialisation. */
int (*init) (void);
/* Return the current time, int mictoseconds since the beginning. */
tick_t (*currticks) (void);
/* Sleep for a few useconds. */
void (*udelay) (unsigned int useconds);
};
#define __timer(order) __table (struct timer, timers, order)
#endif /* GPXE_TIMER_H */

70
src/include/timer.h
View File

@@ -1,61 +1,27 @@
/* Defines for routines to implement a low-overhead timer for drivers */
/*
* 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, or (at
* your option) any later version.
*/
#ifndef TIMER_H
#ifndef TIMER_H
#define TIMER_H
/* Ports for the 8254 timer chip */
#define TIMER2_PORT 0x42
#define TIMER_MODE_PORT 0x43
/*
* This file should be removed as soon as there are no
* currticks() abusers.
*/
/* Meaning of the mode bits */
#define TIMER0_SEL 0x00
#define TIMER1_SEL 0x40
#define TIMER2_SEL 0x80
#define READBACK_SEL 0xC0
#include <stddef.h>
/*
#warning Please fix me. I'm abusing the deprecated include/timer.h
*/
#include <unistd.h>
#define LATCH_COUNT 0x00
#define LOBYTE_ACCESS 0x10
#define HIBYTE_ACCESS 0x20
#define WORD_ACCESS 0x30
/* Duplicates include/gpxe/timer.h */
typedef uint32_t tick_t;
#define MODE0 0x00
#define MODE1 0x02
#define MODE2 0x04
#define MODE3 0x06
#define MODE4 0x08
#define MODE5 0x0A
#define MSECS_IN_SEC (1000)
#define USECS_IN_SEC (1000*1000)
#define USECS_IN_MSEC (1000)
#define BINARY_COUNT 0x00
#define BCD_COUNT 0x01
#define TICKS_PER_SEC USECS_IN_SEC
/* Timers tick over at this rate */
#define CLOCK_TICK_RATE 1193180U
#define TICKS_PER_MS (CLOCK_TICK_RATE/1000)
tick_t currticks(void);
/* Parallel Peripheral Controller Port B */
#define PPC_PORTB 0x61
#endif
/* Meaning of the port bits */
#define PPCB_T2OUT 0x20 /* Bit 5 */
#define PPCB_SPKR 0x02 /* Bit 1 */
#define PPCB_T2GATE 0x01 /* Bit 0 */
/* Ticks must be between 0 and 65535 (0 == 65536)
because it is a 16 bit counter */
extern void load_timer2(unsigned int ticks);
extern inline int timer2_running(void);
extern void waiton_timer2(unsigned int ticks);
extern void ndelay(unsigned int nsecs);
extern void udelay(unsigned int usecs);
extern void mdelay(unsigned int msecs);
#endif /* TIMER_H */

8
src/include/unistd.h
View File

@@ -4,7 +4,7 @@
#include <stddef.h>
#include <stdarg.h>
extern unsigned int sleep ( unsigned int seconds );
unsigned int sleep ( unsigned int seconds );
extern int execv ( const char *command, char * const argv[] );
/**
@@ -22,4 +22,10 @@ extern int execv ( const char *command, char * const argv[] );
rc; \
} )
void udelay(unsigned int usecs);
void mdelay(unsigned int msecs);
#define usleep(x) udelay(x)
#endif /* _UNISTD_H */