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Annotation of coherent/f/usr/include.78/sys/poll_clk.h, revision 1.1

1.1     ! root        1: /* (-lgl
        !             2:  *     COHERENT 386 Device Driver Kit release 2.0
        !             3:  *     Copyright (c) 1982, 1992 by Mark Williams Company.
        !             4:  *     All rights reserved. May not be copied without permission.
        !             5:  -lgl) */
        !             6: /*
        !             7:  * poll_clk.h - include file for drivers using altclk_in()/altclk_out()
        !             8:  */
        !             9: 
        !            10: #ifndef        __SYS_POLL_CLK_H__
        !            11: #define        __SYS_POLL_CLK_H__
        !            12: 
        !            13: #include <sys/silo.h>
        !            14: /*
        !            15:  * bit fields in com_usage[0..3]
        !            16:  *   in_use is incremented each time open is attempted, and decremented
        !            17:  *     when the open fails or the corresponding close completes
        !            18:  *   irq is true when the port is in use (open or hanging) with interrupts
        !            19:  *   has_irq is true when the irq vector for the port is usable;
        !            20:  *     it is not ok to enable interrupts until this goes true!
        !            21:  *   poll is true when the port is open for polling
        !            22:  *   hcls is true while the port is doing last close
        !            23:  *   ohlt is true while CTS flow control halts output
        !            24:  */
        !            25: typedef struct {
        !            26:        short uart_type;        /* see US_* in ins8250.h */
        !            27:        short in_use;
        !            28:        int irq:1;
        !            29:        int has_irq:1;
        !            30:        int poll:1;
        !            31:        int hcls:1;
        !            32:        int ohlt:1;
        !            33:        silo_t raw_in;
        !            34:        silo_t raw_out;
        !            35: } com_usage_t;
        !            36: 
        !            37: /* bits in poll_owner - at most one will be set at a time */
        !            38: #define POLL_AL                1
        !            39: #define POLL_HS                2
        !            40: #define POLL_ASY       4
        !            41: 
        !            42: /*
        !            43:  * The following variables are defined in support.c
        !            44:  *
        !            45:  * "poll_rate" is the polling rate in HZ, 0 if no polling being done
        !            46:  * "poll_owner" is a bit array so only one driver at a time can
        !            47:  *   use an alternate clock routine
        !            48:  * "com_usage" is used only by al0/al1 drivers
        !            49:  */
        !            50: extern com_usage_t     com_usage[];    /* COM_UNUSED/COM_IRQ/COM_POLLED */
        !            51: extern int     poll_rate;      /* used by "prate" command */
        !            52: extern int     poll_owner;     /* checked during *open() of port */
        !            53: #endif

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