| /* ----------------------------------------------------------------------- * |
| * |
| * Copyright 2003-2008 H. Peter Anvin - All Rights Reserved |
| * |
| * Permission is hereby granted, free of charge, to any person |
| * obtaining a copy of this software and associated documentation |
| * files (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, |
| * copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom |
| * the Software is furnished to do so, subject to the following |
| * conditions: |
| * |
| * The above copyright notice and this permission notice shall |
| * be included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
| * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * ----------------------------------------------------------------------- */ |
| |
| /* |
| * file.h |
| * |
| * Internal implementation of file I/O for COM32 |
| */ |
| |
| #ifndef _COM32_SYS_FILE_H |
| #define _COM32_SYS_FILE_H |
| |
| #include <inttypes.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <dev.h> |
| #include <fcntl.h> |
| #include <syslinux/pmapi.h> |
| |
| /* Device structure; contains the relevant operations */ |
| |
| struct file_info; |
| |
| #define __DEV_MAGIC 0xf4e7 |
| #define __DEV_TTY 0x0001 /* TTY - must be bit 0 */ |
| #define __DEV_FILE 0x0002 /* Ordinary file */ |
| #define __DEV_OUTPUT 0x0004 /* This is an output device */ |
| #define __DEV_INPUT 0 /* Dummy */ |
| #define __DEV_ERROR 0x0008 /* This is the error device */ |
| #define __DEV_NULL 0x0010 /* This is the null device */ |
| |
| struct input_dev { |
| uint16_t dev_magic; /* Magic number */ |
| uint16_t flags; /* Flags */ |
| int fileflags; /* Permitted file flags */ |
| ssize_t (*read)(struct file_info *, void *, size_t); |
| int (*close)(struct file_info *); |
| int (*open)(struct file_info *); |
| }; |
| |
| struct output_dev { |
| uint16_t dev_magic; /* Magic number */ |
| uint16_t flags; /* Flags */ |
| int fileflags; |
| ssize_t (*write)(struct file_info *, const void *, size_t); |
| int (*close)(struct file_info *); |
| int (*open)(struct file_info *); |
| const struct output_dev *fallback; /* Fallback option for certain consoles */ |
| }; |
| |
| /* File structure */ |
| |
| #define NFILES 128 /* Number of files to support */ |
| #define MAXBLOCK 16384 /* Defined by ABI */ |
| |
| struct file_info { |
| const struct input_dev *iop; /* Input operations */ |
| const struct output_dev *oop; /* Output operations */ |
| |
| /* Output file data */ |
| struct { |
| int rows, cols; /* Rows and columns */ |
| } o; |
| |
| /* Structure used for input blocking */ |
| struct { |
| struct com32_filedata fd; |
| size_t offset; /* Current file offset */ |
| size_t nbytes; /* Number of bytes available in buffer */ |
| char *datap; /* Current data pointer */ |
| void *pvt; /* Private pointer for driver */ |
| char buf[MAXBLOCK]; |
| } i; |
| }; |
| |
| extern struct file_info __file_info[NFILES]; |
| extern const struct input_dev __file_dev; |
| |
| /* Line input discipline */ |
| ssize_t __line_input(struct file_info *fp, char *buf, size_t bufsize, |
| ssize_t(*get_char) (struct file_info *, void *, size_t)); |
| |
| #endif /* _COM32_SYS_FILE_H */ |