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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * interface to the SCLP-read/write driver4 *5 * Copyright IBM Corporation 1999, 20096 *7 * Author(s): Martin Peschke <mpeschke@de.ibm.com>8 * Martin Schwidefsky <schwidefsky@de.ibm.com>9 */10 11#ifndef __SCLP_RW_H__12#define __SCLP_RW_H__13 14#include <linux/list.h>15 16struct mto {17 u16 length;18 u16 type;19 u16 line_type_flags;20 u8 alarm_control;21 u8 _reserved[3];22} __attribute__((packed));23 24struct go {25 u16 length;26 u16 type;27 u32 domid;28 u8 hhmmss_time[8];29 u8 th_time[3];30 u8 reserved_0;31 u8 dddyyyy_date[7];32 u8 _reserved_1;33 u16 general_msg_flags;34 u8 _reserved_2[10];35 u8 originating_system_name[8];36 u8 job_guest_name[8];37} __attribute__((packed));38 39struct mdb_header {40 u16 length;41 u16 type;42 u32 tag;43 u32 revision_code;44} __attribute__((packed));45 46struct mdb {47 struct mdb_header header;48 struct go go;49 struct mto mto;50} __attribute__((packed));51 52struct msg_buf {53 struct evbuf_header header;54 struct mdb mdb;55} __attribute__((packed));56 57/* The number of empty mto buffers that can be contained in a single sccb. */58#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \59 sizeof(struct sccb_header)) / sizeof(struct msg_buf))60 61/*62 * data structure for information about list of SCCBs (only for writing),63 * will be located at the end of a SCCBs page64 */65struct sclp_buffer {66 struct list_head list; /* list_head for sccb_info chain */67 struct sclp_req request;68 void *sccb;69 struct msg_buf *current_msg;70 char *current_line;71 int current_length;72 int retry_count;73 /* output format settings */74 unsigned short columns;75 unsigned short htab;76 /* statistics about this buffer */77 unsigned int char_sum; /* # chars in sccb */78 unsigned int messages; /* # messages in sccb */79 /* Callback that is called after reaching final status. */80 void (*callback)(struct sclp_buffer *, int);81};82 83int sclp_rw_init(void);84struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);85void *sclp_unmake_buffer(struct sclp_buffer *);86int sclp_buffer_space(struct sclp_buffer *);87int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);88int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));89unsigned int sclp_chars_in_buffer(struct sclp_buffer *);90 91#endif /* __SCLP_RW_H__ */92