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Annotation of coherent/a/usr/include.b4ps2/sys/poll_clk.h, revision 1.1

1.1     ! root        1: /* (-lgl
        !             2:  *     COHERENT Driver Kit Version 1.1.0
        !             3:  *     Copyright (c) 1982, 1990 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:  * $Log:       poll_clk.h,v $
        !            10:  * Revision 1.2  92/09/29  09:27:07  bin
        !            11:  * updated with kernel 63 src
        !            12:  * 
        !            13:  * Revision 1.4  91/12/10  07:57:01  hal
        !            14:  * Add uart_type and has_irq usage fields.
        !            15:  * Change in_use from boolean (:1) to short.
        !            16:  * 
        !            17:  * Revision 1.3  91/11/14  14:11:13  hal
        !            18:  * Re-entrancy fix.  Make com_usage bit field.
        !            19:  * 
        !            20:  * Revision 1.2  91/06/04  14:36:10  hal
        !            21:  * Imports are from support.c.
        !            22:  * 
        !            23:  * Revision 1.1  91/06/04  14:34:49  hal
        !            24:  * Initial version - imported from tty.c.
        !            25:  * 
        !            26:  */
        !            27: 
        !            28: #ifndef        POLL_CLK_H
        !            29: #define        POLL_CLK_H
        !            30: 
        !            31: #include <sys/silo.h>
        !            32: /*
        !            33:  * bit fields in com_usage[0..3]
        !            34:  *   in_use is incremented each time open is attempted, and decremented
        !            35:  *     when the open fails or the corresponding close completes
        !            36:  *   irq is true when the port is in use (open or hanging) with interrupts
        !            37:  *   has_irq is true when the irq vector for the port is usable;
        !            38:  *     it is not ok to enable interrupts until this goes true!
        !            39:  *   poll is true when the port is open for polling
        !            40:  *   hcls is true while the port is doing last close
        !            41:  *   ohlt is true while CTS flow control halts output
        !            42:  */
        !            43: typedef struct {
        !            44:        short uart_type;        /* see US_* in ins8250.h */
        !            45:        short in_use;
        !            46:        int irq:1;
        !            47:        int has_irq:1;
        !            48:        int poll:1;
        !            49:        int hcls:1;
        !            50:        int ohlt:1;
        !            51:        silo_t raw_in;
        !            52:        silo_t raw_out;
        !            53: } com_usage_t;
        !            54: 
        !            55: /* bits in poll_owner - at most one will be set at a time */
        !            56: #define POLL_AL                1
        !            57: #define POLL_HS                2
        !            58: #define POLL_ASY       4
        !            59: 
        !            60: /*
        !            61:  * The following variables are defined in support.c
        !            62:  *
        !            63:  * "poll_rate" is the polling rate in HZ, 0 if no polling being done
        !            64:  * "poll_owner" is a bit array so only one driver at a time can
        !            65:  *   use an alternate clock routine
        !            66:  * "com_usage" is used only by al0/al1 drivers
        !            67:  */
        !            68: extern com_usage_t     com_usage[];    /* COM_UNUSED/COM_IRQ/COM_POLLED */
        !            69: extern int     poll_rate;      /* used by "prate" command */
        !            70: extern int     poll_owner;     /* checked during *open() of port */
        !            71: #endif

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