1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2003-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 /* 29 * file.h 30 * 31 * Internal implementation of file I/O for COM32 32 */ 33 34 #ifndef _COM32_SYS_FILE_H 35 #define _COM32_SYS_FILE_H 36 37 #include <inttypes.h> 38 #include <stdlib.h> 39 #include <sys/types.h> 40 #include <dev.h> 41 #include <fcntl.h> 42 #include <syslinux/pmapi.h> 43 44 /* Device structure; contains the relevant operations */ 45 46 struct file_info; 47 48 #define __DEV_MAGIC 0xf4e7 49 #define __DEV_TTY 0x0001 /* TTY - must be bit 0 */ 50 #define __DEV_FILE 0x0002 /* Ordinary file */ 51 #define __DEV_OUTPUT 0x0004 /* This is an output device */ 52 #define __DEV_INPUT 0 /* Dummy */ 53 #define __DEV_ERROR 0x0008 /* This is the error device */ 54 #define __DEV_NULL 0x0010 /* This is the null device */ 55 56 struct input_dev { 57 uint16_t dev_magic; /* Magic number */ 58 uint16_t flags; /* Flags */ 59 int fileflags; /* Permitted file flags */ 60 ssize_t (*read)(struct file_info *, void *, size_t); 61 int (*close)(struct file_info *); 62 int (*open)(struct file_info *); 63 }; 64 65 struct output_dev { 66 uint16_t dev_magic; /* Magic number */ 67 uint16_t flags; /* Flags */ 68 int fileflags; 69 ssize_t (*write)(struct file_info *, const void *, size_t); 70 int (*close)(struct file_info *); 71 int (*open)(struct file_info *); 72 const struct output_dev *fallback; /* Fallback option for certain consoles */ 73 }; 74 75 /* File structure */ 76 77 #define NFILES 128 /* Number of files to support */ 78 #define MAXBLOCK 16384 /* Defined by ABI */ 79 80 struct file_info { 81 const struct input_dev *iop; /* Input operations */ 82 const struct output_dev *oop; /* Output operations */ 83 84 /* Output file data */ 85 struct { 86 int rows, cols; /* Rows and columns */ 87 } o; 88 89 /* Structure used for input blocking */ 90 struct { 91 struct com32_filedata fd; 92 size_t offset; /* Current file offset */ 93 size_t nbytes; /* Number of bytes available in buffer */ 94 char *datap; /* Current data pointer */ 95 void *pvt; /* Private pointer for driver */ 96 char buf[MAXBLOCK]; 97 } i; 98 }; 99 100 extern struct file_info __file_info[NFILES]; 101 extern const struct input_dev __file_dev; 102 103 /* Line input discipline */ 104 ssize_t __line_input(struct file_info *fp, char *buf, size_t bufsize, 105 ssize_t(*get_char) (struct file_info *, void *, size_t)); 106 107 #endif /* _COM32_SYS_FILE_H */ 108