92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* interface to the SCLP-read/write driver
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*
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* Copyright IBM Corporation 1999, 2009
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*
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* Author(s): Martin Peschke <mpeschke@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __SCLP_RW_H__
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#define __SCLP_RW_H__
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#include <linux/list.h>
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struct mto {
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u16 length;
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u16 type;
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u16 line_type_flags;
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u8 alarm_control;
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u8 _reserved[3];
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} __attribute__((packed));
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struct go {
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u16 length;
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u16 type;
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u32 domid;
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u8 hhmmss_time[8];
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u8 th_time[3];
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u8 reserved_0;
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u8 dddyyyy_date[7];
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u8 _reserved_1;
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u16 general_msg_flags;
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u8 _reserved_2[10];
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u8 originating_system_name[8];
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u8 job_guest_name[8];
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} __attribute__((packed));
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struct mdb_header {
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u16 length;
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u16 type;
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u32 tag;
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u32 revision_code;
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} __attribute__((packed));
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struct mdb {
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struct mdb_header header;
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struct go go;
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struct mto mto;
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} __attribute__((packed));
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struct msg_buf {
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struct evbuf_header header;
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struct mdb mdb;
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} __attribute__((packed));
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/* The number of empty mto buffers that can be contained in a single sccb. */
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#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
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sizeof(struct sccb_header)) / sizeof(struct msg_buf))
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/*
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* data structure for information about list of SCCBs (only for writing),
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* will be located at the end of a SCCBs page
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*/
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struct sclp_buffer {
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struct list_head list; /* list_head for sccb_info chain */
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struct sclp_req request;
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void *sccb;
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struct msg_buf *current_msg;
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char *current_line;
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int current_length;
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int retry_count;
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/* output format settings */
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unsigned short columns;
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unsigned short htab;
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/* statistics about this buffer */
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unsigned int char_sum; /* # chars in sccb */
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unsigned int messages; /* # messages in sccb */
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/* Callback that is called after reaching final status. */
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void (*callback)(struct sclp_buffer *, int);
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};
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int sclp_rw_init(void);
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struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
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void *sclp_unmake_buffer(struct sclp_buffer *);
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int sclp_buffer_space(struct sclp_buffer *);
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int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
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int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
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unsigned int sclp_chars_in_buffer(struct sclp_buffer *);
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#endif /* __SCLP_RW_H__ */
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