58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/* This file provides basic types and some constants for the
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* SYS_DEVIO and SYS_VDEVIO system calls, which allow user-level
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* processes to perform device I/O.
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*
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* Created:
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* Apr 08, 2004 by Jorrit N. Herder
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*/
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#ifndef _DEVIO_H
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#define _DEVIO_H
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#include <minix/config.h> /* needed to include <minix/type.h> */
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#include <sys/types.h> /* u8_t, u16_t, u32_t needed */
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/* We have different granularities of port I/O: 8, 16, 32 bits.
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* Also see <ibm/portio.h>, which has functions for bytes, words,
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* and longs. Hence, we need different (port,value)-pair types.
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*/
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typedef struct { u16_t port; u8_t value; } pvb_pair_t;
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typedef struct { u16_t port; u16_t value; } pvw_pair_t;
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typedef struct { u16_t port; u32_t value; } pvl_pair_t;
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/* Macro shorthand to set (port,value)-pair. */
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#define pv_set(pv, p, v) ((pv).port = (p), (pv).value = (v))
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#define pv_ptr_set(pv_ptr, p, v) ((pv_ptr)->port = (p), (pv_ptr)->value = (v))
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#if 0 /* no longer in use !!! */
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/* Define a number of flags to indicate granularity we are using. */
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#define MASK_GRANULARITY 0x000F /* not in use! does not match flags */
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#define PVB_FLAG 'b'
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#define PVW_FLAG 'w'
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#define PVL_FLAG 'l'
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/* Flags indicating whether request wants to do input or output. */
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#define MASK_IN_OR_OUT 0x00F0
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#define DEVIO_INPUT 0x0010
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#define DEVIO_OUTPUT 0x0020
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#endif /* 0 */
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#if 0 /* no longer used !!! */
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/* Define how large the (port,value)-pair buffer in the kernel is.
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* This buffer is used to copy the (port,value)-pairs in kernel space.
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*/
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#define PV_BUF_SIZE 64 /* creates char pv_buf[PV_BUF_SIZE] */
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/* Note that SYS_VDEVIO sends a pointer to a vector of (port,value)-pairs,
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* whereas SYS_DEVIO includes a single (port,value)-pair in the messages.
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* Calculate maximum number of (port,value)-pairs that can be handled
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* in a single SYS_VDEVIO system call with above struct definitions.
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*/
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#define MAX_PVB_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t))
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#define MAX_PVW_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t))
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#define MAX_PVL_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t))
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#endif /* 0 */
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#endif /* _DEVIO_H */
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