mirror of
https://github.com/edk2-porting/linux-next.git
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fcdba07ee3
seems there's no longer need for using con_buf/conf_buf_mtx as vcs_read/vcs_write buffer for user's data. The do_con_write function, that was the other user of this, is currently using its own kmalloc-ed buffer. Not sure when this got changed, as I was able to find this code in 2.6.9, but it's already gone as far as current git history goes - 2.6.12-rc2. AFAICS there's a behaviour change with the current change. The lseek is not completely mutually exclusive with the vcs_read/vcs_write - the file->f_pos might get updated via lseek callback during the vcs_read/vcs_write processing. I tried to find out if the prefered behaviour is to keep this in sync within read/write/lseek functions, but I did not find any pattern on different places. I guess if user end up calling write/lseek from different threads she should know what she's doing. If needed we could use dedicated fd mutex/buffer. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
#ifndef _VT_KERN_H
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#define _VT_KERN_H
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/*
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* this really is an extension of the vc_cons structure in console.c, but
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* with information needed by the vt package
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*/
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#include <linux/vt.h>
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#include <linux/kd.h>
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#include <linux/tty.h>
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#include <linux/mutex.h>
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#include <linux/console_struct.h>
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#include <linux/mm.h>
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#include <linux/consolemap.h>
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#include <linux/notifier.h>
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/*
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* Presently, a lot of graphics programs do not restore the contents of
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* the higher font pages. Defining this flag will avoid use of them, but
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* will lose support for PIO_FONTRESET. Note that many font operations are
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* not likely to work with these programs anyway; they need to be
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* fixed. The linux/Documentation directory includes a code snippet
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* to save and restore the text font.
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*/
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#ifdef CONFIG_VGA_CONSOLE
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#define BROKEN_GRAPHICS_PROGRAMS 1
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#endif
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extern void kd_mksound(unsigned int hz, unsigned int ticks);
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extern int kbd_rate(struct kbd_repeat *rep);
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extern int fg_console, last_console, want_console;
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/* console.c */
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int vc_allocate(unsigned int console);
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int vc_cons_allocated(unsigned int console);
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int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines);
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void vc_deallocate(unsigned int console);
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void reset_palette(struct vc_data *vc);
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void do_blank_screen(int entering_gfx);
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void do_unblank_screen(int leaving_gfx);
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void unblank_screen(void);
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void poke_blanked_console(void);
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int con_font_op(struct vc_data *vc, struct console_font_op *op);
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int con_set_cmap(unsigned char __user *cmap);
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int con_get_cmap(unsigned char __user *cmap);
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void scrollback(struct vc_data *vc, int lines);
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void scrollfront(struct vc_data *vc, int lines);
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void update_region(struct vc_data *vc, unsigned long start, int count);
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void redraw_screen(struct vc_data *vc, int is_switch);
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#define update_screen(x) redraw_screen(x, 0)
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#define switch_screen(x) redraw_screen(x, 1)
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struct tty_struct;
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int tioclinux(struct tty_struct *tty, unsigned long arg);
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#ifdef CONFIG_CONSOLE_TRANSLATIONS
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/* consolemap.c */
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struct unimapinit;
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struct unipair;
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int con_set_trans_old(unsigned char __user * table);
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int con_get_trans_old(unsigned char __user * table);
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int con_set_trans_new(unsigned short __user * table);
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int con_get_trans_new(unsigned short __user * table);
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int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui);
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int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list);
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int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list);
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int con_set_default_unimap(struct vc_data *vc);
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void con_free_unimap(struct vc_data *vc);
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void con_protect_unimap(struct vc_data *vc, int rdonly);
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int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);
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#define vc_translate(vc, c) ((vc)->vc_translate[(c) | \
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((vc)->vc_toggle_meta ? 0x80 : 0)])
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#else
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static inline int con_set_trans_old(unsigned char __user *table)
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{
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return 0;
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}
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static inline int con_get_trans_old(unsigned char __user *table)
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{
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return -EINVAL;
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}
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static inline int con_set_trans_new(unsigned short __user *table)
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{
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return 0;
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}
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static inline int con_get_trans_new(unsigned short __user *table)
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{
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return -EINVAL;
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}
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static inline int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
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{
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return 0;
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}
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static inline
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int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
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{
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return 0;
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}
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static inline
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int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct,
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struct unipair __user *list)
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{
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return -EINVAL;
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}
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static inline int con_set_default_unimap(struct vc_data *vc)
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{
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return 0;
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}
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static inline void con_free_unimap(struct vc_data *vc)
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{
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}
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static inline void con_protect_unimap(struct vc_data *vc, int rdonly)
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{
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}
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static inline
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int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
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{
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return 0;
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}
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#define vc_translate(vc, c) (c)
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#endif
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/* vt.c */
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void vt_event_post(unsigned int event, unsigned int old, unsigned int new);
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int vt_waitactive(int n);
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void change_console(struct vc_data *new_vc);
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void reset_vc(struct vc_data *vc);
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extern int unbind_con_driver(const struct consw *csw, int first, int last,
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int deflt);
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int vty_init(const struct file_operations *console_fops);
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static inline bool vt_force_oops_output(struct vc_data *vc)
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{
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if (oops_in_progress && vc->vc_panic_force_write)
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return true;
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return false;
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}
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extern char vt_dont_switch;
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extern int default_utf8;
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extern int global_cursor_default;
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struct vt_spawn_console {
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spinlock_t lock;
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struct pid *pid;
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int sig;
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};
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extern struct vt_spawn_console vt_spawn_con;
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extern int vt_move_to_console(unsigned int vt, int alloc);
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/* Interfaces for VC notification of character events (for accessibility etc) */
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struct vt_notifier_param {
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struct vc_data *vc; /* VC on which the update happened */
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unsigned int c; /* Printed char */
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};
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extern int register_vt_notifier(struct notifier_block *nb);
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extern int unregister_vt_notifier(struct notifier_block *nb);
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extern void hide_boot_cursor(bool hide);
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#endif /* _VT_KERN_H */
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