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60 lines
1.3 KiB
60 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_TTY_BUFFER_H |
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#define _LINUX_TTY_BUFFER_H |
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#include <linux/atomic.h> |
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#include <linux/llist.h> |
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#include <linux/mutex.h> |
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#include <linux/workqueue.h> |
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struct tty_buffer { |
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union { |
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struct tty_buffer *next; |
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struct llist_node free; |
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}; |
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int used; |
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int size; |
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int commit; |
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int lookahead; /* Lazy update on recv, can become less than "read" */ |
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int read; |
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int flags; |
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/* Data points here */ |
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unsigned long data[]; |
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}; |
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/* Values for .flags field of tty_buffer */ |
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#define TTYB_NORMAL 1 /* buffer has no flags buffer */ |
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static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) |
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{ |
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return ((unsigned char *)b->data) + ofs; |
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} |
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static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) |
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{ |
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return (char *)char_buf_ptr(b, ofs) + b->size; |
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} |
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struct tty_bufhead { |
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struct tty_buffer *head; /* Queue head */ |
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struct work_struct work; |
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struct mutex lock; |
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atomic_t priority; |
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struct tty_buffer sentinel; |
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struct llist_head free; /* Free queue head */ |
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atomic_t mem_used; /* In-use buffers excluding free list */ |
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int mem_limit; |
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struct tty_buffer *tail; /* Active buffer */ |
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}; |
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/* |
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* When a break, frame error, or parity error happens, these codes are |
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* stuffed into the flags buffer. |
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*/ |
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#define TTY_NORMAL 0 |
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#define TTY_BREAK 1 |
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#define TTY_FRAME 2 |
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#define TTY_PARITY 3 |
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#define TTY_OVERRUN 4 |
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#endif
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