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