Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
Make console charset translation optional
By turning off the new CONSOLE_TRANSLATIONS option and dropping the
associated code and tables from the kernel, we can save about 7KiB.
Taken from linux-tiny project by Tim Bird and mangled further by dwmw2.
Signed-off-by: Tim Bird <tim.bird@am.sony.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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drivers/char/Kconfig
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drivers/char/Kconfig
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If unsure, say Y, or else you won't be able to do much with your new
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shiny Linux system :-)
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config CONSOLE_TRANSLATIONS
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depends on VT
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default y
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bool "Enable character translations in console" if EMBEDDED
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---help---
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This enables support for font mapping and Unicode translation
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on virtual consoles.
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config VT_CONSOLE
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bool "Support for console on virtual terminal" if EMBEDDED
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depends on VT
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-2
drivers/char/Makefile
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-2
drivers/char/Makefile
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obj-$(CONFIG_LEGACY_PTYS) += pty.o
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obj-$(CONFIG_UNIX98_PTYS) += pty.o
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obj-y += misc.o
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-
obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o consolemap.o \
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consolemap_deftbl.o selection.o keyboard.o
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obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o selection.o keyboard.o
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obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o
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obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o
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obj-$(CONFIG_AUDIT) += tty_audit.o
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obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
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-1
drivers/char/vt.c
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-1
drivers/char/vt.c
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include/linux/consolemap.h
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include/linux/consolemap.h
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*
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* Interface between console.c, selection.c and consolemap.c
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*/
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#ifndef __LINUX_CONSOLEMAP_H__
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#define __LINUX_CONSOLEMAP_H__
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#define LAT1_MAP 0
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#define GRAF_MAP 1
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#define IBMPC_MAP 2
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#include <linux/types.h>
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#ifdef CONFIG_CONSOLE_TRANSLATIONS
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struct vc_data;
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extern u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode);
···
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extern u32 conv_8bit_to_uni(unsigned char c);
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extern int conv_uni_to_8bit(u32 uni);
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void console_map_init(void);
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#else
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#define inverse_translate(conp, glyph, uni) ((uint16_t)glyph)
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#define set_translate(m, vc) ((unsigned short *)NULL)
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#define conv_uni_to_pc(conp, ucs) ((int) (ucs > 0xff ? -1: ucs))
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#define conv_8bit_to_uni(c) ((uint32_t)(c))
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#define conv_uni_to_8bit(c) ((int) ((c) & 0xff))
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#define console_map_init(c) do { ; } while (0)
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#endif /* CONFIG_CONSOLE_TRANSLATIONS */
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#endif /* __LINUX_CONSOLEMAP_H__ */
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include/linux/vt_kern.h
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include/linux/vt_kern.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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/*
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* Presently, a lot of graphics programs do not restore the contents of
···
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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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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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#define con_set_trans_old(arg) (0)
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#define con_get_trans_old(arg) (-EINVAL)
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#define con_set_trans_new(arg) (0)
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#define con_get_trans_new(arg) (-EINVAL)
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#define con_clear_unimap(vc, ui) (0)
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#define con_set_unimap(vc, ct, list) (0)
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#define con_set_default_unimap(vc) (0)
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#define con_copy_unimap(d, s) (0)
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#define con_get_unimap(vc, ct, uct, list) (-EINVAL)
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#define con_free_unimap(vc) do { ; } while (0)
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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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int vt_waitactive(int vt);