1 | /* This file provides basic types and some constants for the
|
---|
2 | * SYS_DEVIO and SYS_VDEVIO system calls, which allow user-level
|
---|
3 | * processes to perform device I/O.
|
---|
4 | *
|
---|
5 | * Created:
|
---|
6 | * Apr 08, 2004 by Jorrit N. Herder
|
---|
7 | */
|
---|
8 |
|
---|
9 | #ifndef _DEVIO_H
|
---|
10 | #define _DEVIO_H
|
---|
11 |
|
---|
12 | #include <minix/sys_config.h> /* needed to include <minix/type.h> */
|
---|
13 | #include <sys/types.h> /* u8_t, u16_t, u32_t needed */
|
---|
14 |
|
---|
15 | typedef u16_t port_t;
|
---|
16 | typedef U16_t Port_t;
|
---|
17 |
|
---|
18 | /* We have different granularities of port I/O: 8, 16, 32 bits.
|
---|
19 | * Also see <ibm/portio.h>, which has functions for bytes, words,
|
---|
20 | * and longs. Hence, we need different (port,value)-pair types.
|
---|
21 | */
|
---|
22 | typedef struct { u16_t port; u8_t value; } pvb_pair_t;
|
---|
23 | typedef struct { u16_t port; u16_t value; } pvw_pair_t;
|
---|
24 | typedef struct { u16_t port; u32_t value; } pvl_pair_t;
|
---|
25 |
|
---|
26 | /* Macro shorthand to set (port,value)-pair. */
|
---|
27 | #define pv_set(pv, p, v) ((pv).port = (p), (pv).value = (v))
|
---|
28 | #define pv_ptr_set(pv_ptr, p, v) ((pv_ptr)->port = (p), (pv_ptr)->value = (v))
|
---|
29 |
|
---|
30 | #if 0 /* no longer in use !!! */
|
---|
31 | /* Define a number of flags to indicate granularity we are using. */
|
---|
32 | #define MASK_GRANULARITY 0x000F /* not in use! does not match flags */
|
---|
33 | #define PVB_FLAG 'b'
|
---|
34 | #define PVW_FLAG 'w'
|
---|
35 | #define PVL_FLAG 'l'
|
---|
36 |
|
---|
37 | /* Flags indicating whether request wants to do input or output. */
|
---|
38 | #define MASK_IN_OR_OUT 0x00F0
|
---|
39 | #define DEVIO_INPUT 0x0010
|
---|
40 | #define DEVIO_OUTPUT 0x0020
|
---|
41 | #endif /* 0 */
|
---|
42 |
|
---|
43 | #if 0 /* no longer used !!! */
|
---|
44 | /* Define how large the (port,value)-pair buffer in the kernel is.
|
---|
45 | * This buffer is used to copy the (port,value)-pairs in kernel space.
|
---|
46 | */
|
---|
47 | #define PV_BUF_SIZE 64 /* creates char pv_buf[PV_BUF_SIZE] */
|
---|
48 |
|
---|
49 | /* Note that SYS_VDEVIO sends a pointer to a vector of (port,value)-pairs,
|
---|
50 | * whereas SYS_DEVIO includes a single (port,value)-pair in the messages.
|
---|
51 | * Calculate maximum number of (port,value)-pairs that can be handled
|
---|
52 | * in a single SYS_VDEVIO system call with above struct definitions.
|
---|
53 | */
|
---|
54 | #define MAX_PVB_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t))
|
---|
55 | #define MAX_PVW_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t))
|
---|
56 | #define MAX_PVL_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t))
|
---|
57 | #endif /* 0 */
|
---|
58 |
|
---|
59 |
|
---|
60 | #endif /* _DEVIO_H */
|
---|