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Annotation of qemu/roms/openbios/drivers/timer.h, revision 1.1

1.1     ! root        1: /* Taken from Etherboot */
        !             2: /* Defines for routines to implement a low-overhead timer for drivers */
        !             3: 
        !             4:  /*
        !             5:  * This program is free software; you can redistribute it and/or
        !             6:  * modify it under the terms of the GNU General Public License as
        !             7:  * published by the Free Software Foundation; either version 2, or (at
        !             8:  * your option) any later version.
        !             9:  */
        !            10: 
        !            11: #ifndef        TIMER_H
        !            12: #define TIMER_H
        !            13: 
        !            14: /* Ports for the 8254 timer chip */
        !            15: #define        TIMER2_PORT     0x42
        !            16: #define        TIMER_MODE_PORT 0x43
        !            17: 
        !            18: /* Meaning of the mode bits */
        !            19: #define        TIMER0_SEL      0x00
        !            20: #define        TIMER1_SEL      0x40
        !            21: #define        TIMER2_SEL      0x80
        !            22: #define        READBACK_SEL    0xC0
        !            23: 
        !            24: #define        LATCH_COUNT     0x00
        !            25: #define        LOBYTE_ACCESS   0x10
        !            26: #define        HIBYTE_ACCESS   0x20
        !            27: #define        WORD_ACCESS     0x30
        !            28: 
        !            29: #define        MODE0           0x00
        !            30: #define        MODE1           0x02
        !            31: #define        MODE2           0x04
        !            32: #define        MODE3           0x06
        !            33: #define        MODE4           0x08
        !            34: #define        MODE5           0x0A
        !            35: 
        !            36: #define        BINARY_COUNT    0x00
        !            37: #define        BCD_COUNT       0x01
        !            38: 
        !            39: /* Timers tick over at this rate */
        !            40: #define CLOCK_TICK_RATE        1193180U
        !            41: #define        TICKS_PER_MS    (CLOCK_TICK_RATE/1000)
        !            42: 
        !            43: /* Parallel Peripheral Controller Port B */
        !            44: #define        PPC_PORTB       0x61
        !            45: 
        !            46: /* Meaning of the port bits */
        !            47: #define        PPCB_T2OUT      0x20    /* Bit 5 */
        !            48: #define        PPCB_SPKR       0x02    /* Bit 1 */
        !            49: #define        PPCB_T2GATE     0x01    /* Bit 0 */
        !            50: 
        !            51: extern void ndelay(unsigned int nsecs);
        !            52: extern void udelay(unsigned int usecs);
        !            53: extern void mdelay(unsigned int msecs);
        !            54: extern unsigned long currticks(void);
        !            55: extern unsigned long get_timer_freq(void);
        !            56: 
        !            57: /* arch/ppc/timebase.S */
        !            58: void _wait_ticks(unsigned long nticks);
        !            59: 
        !            60: #define TICKS_PER_SEC 1000
        !            61: 
        !            62: #endif /* TIMER_H */

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