1 /* 2 * drivers/s390/char/sclp_rw.h 3 * interface to the SCLP-read/write driver 4 * 5 * S390 version 6 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 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 16 struct mto { 17 u16 length; 18 u16 type; 19 u16 line_type_flags; 20 u8 alarm_control; 21 u8 _reserved[3]; 22 } __attribute__((packed)); 23 24 struct 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 39 struct mdb_header { 40 u16 length; 41 u16 type; 42 u32 tag; 43 u32 revision_code; 44 } __attribute__((packed)); 45 46 struct mdb { 47 struct mdb_header header; 48 struct go go; 49 } __attribute__((packed)); 50 51 struct msg_buf { 52 struct evbuf_header header; 53 struct mdb mdb; 54 } __attribute__((packed)); 55 56 struct write_sccb { 57 struct sccb_header header; 58 struct msg_buf msg_buf; 59 } __attribute__((packed)); 60 61 /* The number of empty mto buffers that can be contained in a single sccb. */ 62 #define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \ 63 sizeof(struct write_sccb)) / sizeof(struct mto)) 64 65 /* 66 * data structure for information about list of SCCBs (only for writing), 67 * will be located at the end of a SCCBs page 68 */ 69 struct sclp_buffer { 70 struct list_head list; /* list_head for sccb_info chain */ 71 struct sclp_req request; 72 struct write_sccb *sccb; 73 char *current_line; 74 int current_length; 75 int retry_count; 76 /* output format settings */ 77 unsigned short columns; 78 unsigned short htab; 79 /* statistics about this buffer */ 80 unsigned int mto_char_sum; /* # chars in sccb */ 81 unsigned int mto_number; /* # mtos in sccb */ 82 /* Callback that is called after reaching final status. */ 83 void (*callback)(struct sclp_buffer *, int); 84 }; 85 86 int sclp_rw_init(void); 87 struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short); 88 void *sclp_unmake_buffer(struct sclp_buffer *); 89 int sclp_buffer_space(struct sclp_buffer *); 90 int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int); 91 int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int)); 92 void sclp_set_columns(struct sclp_buffer *, unsigned short); 93 void sclp_set_htab(struct sclp_buffer *, unsigned short); 94 int sclp_chars_in_buffer(struct sclp_buffer *); 95 96 #endif /* __SCLP_RW_H__ */ 97