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SubjectRe: [PATCH] console - Add configurable support for console charset translation
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On Mon, 2008-06-02 at 15:37 -0700, Tim Bird wrote:
> With CONSOLE_TRANSLATIONS turned off, this saves about 6K
> on my kernel configured for an ARM development board (OMAP
> 5912 OSK). In embedded products I'm familiar with,
> console translations are not needed.
>
> This was taken from the Linux-tiny project and updated slightly
> for 2.6.25.

I prefer it like this... we can drop consolemap.o and
consolemap_deftbl.o from the build completely. It saves 7.2KiB on a
ppc32 build here.

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 595a925..f740190 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -36,6 +36,13 @@ config VT
If unsure, say Y, or else you won't be able to do much with your new
shiny Linux system :-)

+config CONSOLE_TRANSLATIONS
+ default y
+ bool "Enable character translations in console" if EMBEDDED
+ ---help---
+ This enables support for font mapping and Unicode translation
+ on virtual consoles.
+
config VT_CONSOLE
bool "Support for console on virtual terminal" if EMBEDDED
depends on VT
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 4c1c584..6ef173c 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -12,8 +12,8 @@ obj-y += mem.o random.o tty_io.o n_tty.o tty_ioctl.o
obj-$(CONFIG_LEGACY_PTYS) += pty.o
obj-$(CONFIG_UNIX98_PTYS) += pty.o
obj-y += misc.o
-obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o consolemap.o \
- consolemap_deftbl.o selection.o keyboard.o
+obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o selection.o keyboard.o
+obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o
obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o
obj-$(CONFIG_AUDIT) += tty_audit.o
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
diff --git a/include/linux/consolemap.h b/include/linux/consolemap.h
index e2bf7e5..c4811da 100644
--- a/include/linux/consolemap.h
+++ b/include/linux/consolemap.h
@@ -3,6 +3,9 @@
*
* Interface between console.c, selection.c and consolemap.c
*/
+#ifndef __LINUX_CONSOLEMAP_H__
+#define __LINUX_CONSOLEMAP_H__
+
#define LAT1_MAP 0
#define GRAF_MAP 1
#define IBMPC_MAP 2
@@ -10,6 +13,7 @@

#include <linux/types.h>

+#ifdef CONFIG_CONSOLE_TRANSLATIONS
struct vc_data;

extern u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode);
@@ -18,3 +22,13 @@ extern int conv_uni_to_pc(struct vc_data *conp, long ucs);
extern u32 conv_8bit_to_uni(unsigned char c);
extern int conv_uni_to_8bit(u32 uni);
void console_map_init(void);
+#else
+#define inverse_translate(conp, glyph, uni) ((uint16_t)glyph)
+#define set_translate(m, vc) ((unsigned short *)NULL)
+#define conv_uni_to_pc(conp, ucs) ((int) (ucs > 0xff ? -1: ucs))
+#define conv_8bit_to_uni(c) ((uint32_t)(c))
+#define conv_uni_to_8bit(c) ((int) ((c) & 0xff))
+#define console_map_init(c) do { ; } while (0)
+#endif /* CONFIG_CONSOLE_TRANSLATIONS */
+
+#endif /* __LINUX_CONSOLEMAP_H__ */
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 9448ffb..81ed155 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -12,6 +12,7 @@
#include <linux/mutex.h>
#include <linux/console_struct.h>
#include <linux/mm.h>
+#include <linux/consolemap.h>

/*
* Presently, a lot of graphics programs do not restore the contents of
@@ -54,6 +55,7 @@ void redraw_screen(struct vc_data *vc, int is_switch);
struct tty_struct;
int tioclinux(struct tty_struct *tty, unsigned long arg);

+#ifdef CONFIG_CONSOLE_TRANSLATIONS
/* consolemap.c */

struct unimapinit;
@@ -70,6 +72,18 @@ int con_set_default_unimap(struct vc_data *vc);
void con_free_unimap(struct vc_data *vc);
void con_protect_unimap(struct vc_data *vc, int rdonly);
int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);
+#else
+#define con_set_trans_old(arg) (0)
+#define con_get_trans_old(arg) (-EINVAL)
+#define con_set_trans_new(arg) (0)
+#define con_get_trans_new(arg) (-EINVAL)
+#define con_clear_unimap(vc, ui) (0)
+#define con_set_unimap(vc, ct, list) (0)
+#define con_set_default_unimap(vc) (0)
+#define con_copy_unimap(d, s) (0)
+#define con_get_unimap(vc, ct, uct, list) (-EINVAL)
+#define con_free_unimap(vc) do { ; } while (0)
+#endif

/* vt.c */
int vt_waitactive(int vt);
--
dwmw2



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