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Annotation of coherent/a/usr/include.b4ps2/sys/poll_clk.h.SAV, revision 1.1.1.1

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

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