diff options
Diffstat (limited to 'drivers/s390/char/sclp_rw.h')
| -rw-r--r-- | drivers/s390/char/sclp_rw.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_rw.h b/drivers/s390/char/sclp_rw.h new file mode 100644 index 000000000..a2eb22f67 --- /dev/null +++ b/drivers/s390/char/sclp_rw.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * interface to the SCLP-read/write driver + * + * Copyright IBM Corporation 1999, 2009 + * + * Author(s): Martin Peschke <mpeschke@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + */ + +#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 *); + +#ifdef CONFIG_SCLP_CONSOLE +void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event); +#else +static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { } +#endif + +#endif /* __SCLP_RW_H__ */ |