2023-08-07 02:22:01

by Dr. David Alan Gilbert

[permalink] [raw]
Subject: [PATCH v2] powerpc: Use shared font data

From: "Dr. David Alan Gilbert" <[email protected]>

PowerPC has a 'btext' font used for the console which is almost identical
to the shared font_sun8x16, so use it rather than duplicating the data.

They were actually identical until about a decade ago when
commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
"broken bar" to "vertical line"")

which changed the | in the shared font to be a solid
bar rather than a broken bar. That's the only difference.

This was originally spotted by PMD which noticed that sparc does
the same thing with the same data, and they also share a bunch
of functions to manipulate the data. I've previously posted a near
identical patch for sparc.

One difference I notice in PowerPC is that there are a bunch of compile
options for the .c files for the early code to avoid a bunch of security
compilation features; it's not clear to me if this is a problem for
this font data.

Tested very lightly with a boot without FS in qemu.

v2
Added 'select FONT_SUPPORT' (to stop modconfig causing the font to be
linked into a module rather than the main kernel)
Added 'select FONTS' to satisfy requirements in lib/fonts

Signed-off-by: Dr. David Alan Gilbert <[email protected]>
---
arch/powerpc/Kconfig.debug | 3 +
arch/powerpc/kernel/btext.c | 360 +-----------------------------------
2 files changed, 9 insertions(+), 354 deletions(-)

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 2a54fadbeaf51..521c4baf30e88 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -147,6 +147,9 @@ config BDI_SWITCH
config BOOTX_TEXT
bool "Support for early boot text console (BootX or OpenFirmware only)"
depends on PPC_BOOK3S
+ select FONT_SUN8x16
+ select FONT_SUPPORT
+ select FONTS
help
Say Y here to see progress messages from the boot firmware in text
mode. Requires either BootX or Open Firmware.
diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 19e46fd623b0d..7f63f1cdc6c39 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -8,6 +8,7 @@
#include <linux/string.h>
#include <linux/init.h>
#include <linux/export.h>
+#include <linux/font.h>
#include <linux/memblock.h>
#include <linux/pgtable.h>
#include <linux/of.h>
@@ -41,10 +42,6 @@ static unsigned char *logicalDisplayBase __force_data;

unsigned long disp_BAT[2] __initdata = {0, 0};

-#define cmapsz (16*256)
-
-static unsigned char vga_font[cmapsz];
-
static int boot_text_mapped __force_data;

extern void rmci_on(void);
@@ -407,7 +404,7 @@ static unsigned int expand_bits_16[4] = {
};


-static void draw_byte_32(unsigned char *font, unsigned int *base, int rb)
+static void draw_byte_32(const unsigned char *font, unsigned int *base, int rb)
{
int l, bits;
int fg = 0xFFFFFFFFUL;
@@ -428,7 +425,7 @@ static void draw_byte_32(unsigned char *font, unsigned int *base, int rb)
}
}

-static inline void draw_byte_16(unsigned char *font, unsigned int *base, int rb)
+static inline void draw_byte_16(const unsigned char *font, unsigned int *base, int rb)
{
int l, bits;
int fg = 0xFFFFFFFFUL;
@@ -446,7 +443,7 @@ static inline void draw_byte_16(unsigned char *font, unsigned int *base, int rb)
}
}

-static inline void draw_byte_8(unsigned char *font, unsigned int *base, int rb)
+static inline void draw_byte_8(const unsigned char *font, unsigned int *base, int rb)
{
int l, bits;
int fg = 0x0F0F0F0FUL;
@@ -465,7 +462,8 @@ static inline void draw_byte_8(unsigned char *font, unsigned int *base, int rb)
static noinline void draw_byte(unsigned char c, long locX, long locY)
{
unsigned char *base = calc_base(locX << 3, locY << 4);
- unsigned char *font = &vga_font[((unsigned int)c) * 16];
+ unsigned int font_index = c * 16;
+ const unsigned char *font = font_sun_8x16.data + font_index;
int rb = dispDeviceRowBytes;

rmci_maybe_on();
@@ -583,349 +581,3 @@ void __init udbg_init_btext(void)
*/
udbg_putc = btext_drawchar;
}
-
-static unsigned char vga_font[cmapsz] = {
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd,
-0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xff,
-0xdb, 0xff, 0xff, 0xc3, 0xe7, 0xff, 0xff, 0x7e, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe,
-0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
-0x3c, 0x3c, 0xe7, 0xe7, 0xe7, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x18, 0x18, 0x3c,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
-0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
-0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00,
-0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd,
-0xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x1e, 0x0e,
-0x1a, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x18, 0x18,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x33, 0x3f, 0x30, 0x30, 0x30,
-0x30, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x63,
-0x7f, 0x63, 0x63, 0x63, 0x63, 0x67, 0xe7, 0xe6, 0xc0, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfe, 0xf8,
-0xf0, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x0e,
-0x1e, 0x3e, 0xfe, 0x3e, 0x1e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00,
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-0x66, 0x00, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xdb,
-0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x7c, 0xc6, 0x60, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x0c, 0xc6,
-0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0xfe, 0xfe, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
-0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
-0x18, 0x7e, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x18, 0x0c, 0xfe, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x60, 0xfe, 0x60, 0x30, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xc0,
-0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe, 0xfe, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe, 0x7c, 0x7c,
-0x38, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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-0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00,
-0x18, 0x18, 0x7c, 0xc6, 0xc2, 0xc0, 0x7c, 0x06, 0x06, 0x86, 0xc6, 0x7c,
-0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc2, 0xc6, 0x0c, 0x18,
-0x30, 0x60, 0xc6, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
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-0x30, 0x30, 0x18, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x18,
-0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x3c, 0xff, 0x3c, 0x66, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e,
-0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00,
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-0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xce, 0xde, 0xf6, 0xe6, 0xc6, 0xc6, 0x7c,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18,
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-0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0xc6, 0x7c,
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-0x0c, 0x0c, 0x0c, 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0,
-0xc0, 0xc0, 0xfc, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x38, 0x60, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18,
-0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
-0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x0c, 0x78,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00,
-0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0c, 0x06,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00,
-0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60,
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-0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x0c, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xde, 0xde,
-0xde, 0xdc, 0xc0, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38,
-0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x66, 0x66, 0x66, 0x66, 0xfc,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0xc2, 0xc0, 0xc0, 0xc0,
-0xc0, 0xc2, 0x66, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x6c,
-0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x6c, 0xf8, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xfe, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x62, 0x66, 0xfe,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x66, 0x62, 0x68, 0x78, 0x68,
-0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66,
-0xc2, 0xc0, 0xc0, 0xde, 0xc6, 0xc6, 0x66, 0x3a, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
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-0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x0c,
-0x0c, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xe6, 0x66, 0x66, 0x6c, 0x78, 0x78, 0x6c, 0x66, 0x66, 0xe6,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x60, 0x60, 0x60, 0x60, 0x60,
-0x60, 0x62, 0x66, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc3, 0xe7,
-0xff, 0xff, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xc6, 0xe6, 0xf6, 0xfe, 0xde, 0xce, 0xc6, 0xc6, 0xc6, 0xc6,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
-0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x66,
-0x66, 0x66, 0x7c, 0x60, 0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xde, 0x7c,
-0x0c, 0x0e, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x6c,
-0x66, 0x66, 0x66, 0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
-0xc6, 0x60, 0x38, 0x0c, 0x06, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xff, 0xdb, 0x99, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
-0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc3, 0xc3,
-0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xdb, 0xdb, 0xff, 0x66, 0x66,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18,
-0x3c, 0x66, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc3, 0xc3,
-0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0xff, 0xc3, 0x86, 0x0c, 0x18, 0x30, 0x60, 0xc1, 0xc3, 0xff,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x30, 0x30, 0x30, 0x30, 0x30,
-0x30, 0x30, 0x30, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
-0xc0, 0xe0, 0x70, 0x38, 0x1c, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c,
-0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00,
-0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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-};
-
--
2.41.0



2023-08-08 18:49:36

by Dr. David Alan Gilbert

[permalink] [raw]
Subject: Re: [PATCH v2] powerpc: Use shared font data

* Randy Dunlap ([email protected]) wrote:
> Hi--
>
> On 8/6/23 18:07, [email protected] wrote:
> > From: "Dr. David Alan Gilbert" <[email protected]>
> >
> > PowerPC has a 'btext' font used for the console which is almost identical
> > to the shared font_sun8x16, so use it rather than duplicating the data.
> >
> > They were actually identical until about a decade ago when
> > commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
> > "broken bar" to "vertical line"")
> >
> > which changed the | in the shared font to be a solid
> > bar rather than a broken bar. That's the only difference.
> >
> > This was originally spotted by PMD which noticed that sparc does
> > the same thing with the same data, and they also share a bunch
> > of functions to manipulate the data. I've previously posted a near
> > identical patch for sparc.
> >
> > One difference I notice in PowerPC is that there are a bunch of compile
> > options for the .c files for the early code to avoid a bunch of security
> > compilation features; it's not clear to me if this is a problem for
> > this font data.
> >
> > Tested very lightly with a boot without FS in qemu.
> >
> > v2
> > Added 'select FONT_SUPPORT' (to stop modconfig causing the font to be
> > linked into a module rather than the main kernel)
> > Added 'select FONTS' to satisfy requirements in lib/fonts
> >
> > Signed-off-by: Dr. David Alan Gilbert <[email protected]>
> > ---
> > arch/powerpc/Kconfig.debug | 3 +
> > arch/powerpc/kernel/btext.c | 360 +-----------------------------------
> > 2 files changed, 9 insertions(+), 354 deletions(-)
> >
> > diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
> > index 2a54fadbeaf51..521c4baf30e88 100644
> > --- a/arch/powerpc/Kconfig.debug
> > +++ b/arch/powerpc/Kconfig.debug
> > @@ -147,6 +147,9 @@ config BDI_SWITCH
> > config BOOTX_TEXT
> > bool "Support for early boot text console (BootX or OpenFirmware only)"
> > depends on PPC_BOOK3S
> > + select FONT_SUN8x16
> > + select FONT_SUPPORT
> > + select FONTS
> > help
> > Say Y here to see progress messages from the boot firmware in text
> > mode. Requires either BootX or Open Firmware.
>
> kconfig tells me:
>
> WARNING: unmet direct dependencies detected for FONTS
> Depends on [n]: FONT_SUPPORT [=y] && (FRAMEBUFFER_CONSOLE [=n] || STI_CONSOLE [=n])
> Selected by [y]:
> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
>
> WARNING: unmet direct dependencies detected for FONT_SUN8x16
> Depends on [n]: FONT_SUPPORT [=y] && FRAMEBUFFER_CONSOLE [=n] && (!SPARC && FONTS [=y] || SPARC)
> Selected by [y]:
> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
>
> because FONTS depends on FRAMEBUFFER_CONSOLE || STI_CONSOLE and neither of those is set.

I'm not getting the warnings in the v2, with a few configs; what command
are using?

I'm tempted to change the FONT_SUN8x16 dependency line to have
SPARC||BOOTX_TEXT or SPARC||POWERPC and drop the 'select FONTS' I
added.

Dave

>
> --
> ~Randy
--
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \
\ dave @ treblig.org | | In Hex /
\ _________________________|_____ http://www.treblig.org |_______/

2023-08-08 20:35:03

by Randy Dunlap

[permalink] [raw]
Subject: Re: [PATCH v2] powerpc: Use shared font data

Hi--

On 8/6/23 18:07, [email protected] wrote:
> From: "Dr. David Alan Gilbert" <[email protected]>
>
> PowerPC has a 'btext' font used for the console which is almost identical
> to the shared font_sun8x16, so use it rather than duplicating the data.
>
> They were actually identical until about a decade ago when
> commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
> "broken bar" to "vertical line"")
>
> which changed the | in the shared font to be a solid
> bar rather than a broken bar. That's the only difference.
>
> This was originally spotted by PMD which noticed that sparc does
> the same thing with the same data, and they also share a bunch
> of functions to manipulate the data. I've previously posted a near
> identical patch for sparc.
>
> One difference I notice in PowerPC is that there are a bunch of compile
> options for the .c files for the early code to avoid a bunch of security
> compilation features; it's not clear to me if this is a problem for
> this font data.
>
> Tested very lightly with a boot without FS in qemu.
>
> v2
> Added 'select FONT_SUPPORT' (to stop modconfig causing the font to be
> linked into a module rather than the main kernel)
> Added 'select FONTS' to satisfy requirements in lib/fonts
>
> Signed-off-by: Dr. David Alan Gilbert <[email protected]>
> ---
> arch/powerpc/Kconfig.debug | 3 +
> arch/powerpc/kernel/btext.c | 360 +-----------------------------------
> 2 files changed, 9 insertions(+), 354 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
> index 2a54fadbeaf51..521c4baf30e88 100644
> --- a/arch/powerpc/Kconfig.debug
> +++ b/arch/powerpc/Kconfig.debug
> @@ -147,6 +147,9 @@ config BDI_SWITCH
> config BOOTX_TEXT
> bool "Support for early boot text console (BootX or OpenFirmware only)"
> depends on PPC_BOOK3S
> + select FONT_SUN8x16
> + select FONT_SUPPORT
> + select FONTS
> help
> Say Y here to see progress messages from the boot firmware in text
> mode. Requires either BootX or Open Firmware.

kconfig tells me:

WARNING: unmet direct dependencies detected for FONTS
Depends on [n]: FONT_SUPPORT [=y] && (FRAMEBUFFER_CONSOLE [=n] || STI_CONSOLE [=n])
Selected by [y]:
- BOOTX_TEXT [=y] && PPC_BOOK3S [=y]

WARNING: unmet direct dependencies detected for FONT_SUN8x16
Depends on [n]: FONT_SUPPORT [=y] && FRAMEBUFFER_CONSOLE [=n] && (!SPARC && FONTS [=y] || SPARC)
Selected by [y]:
- BOOTX_TEXT [=y] && PPC_BOOK3S [=y]

because FONTS depends on FRAMEBUFFER_CONSOLE || STI_CONSOLE and neither of those is set.


--
~Randy

2023-08-08 22:09:51

by Randy Dunlap

[permalink] [raw]
Subject: Re: [PATCH v2] powerpc: Use shared font data



On 8/8/23 10:28, Dr. David Alan Gilbert wrote:
> * Randy Dunlap ([email protected]) wrote:
>> Hi--
>>
>> On 8/6/23 18:07, [email protected] wrote:
>>> From: "Dr. David Alan Gilbert" <[email protected]>
>>>
>>> PowerPC has a 'btext' font used for the console which is almost identical
>>> to the shared font_sun8x16, so use it rather than duplicating the data.
>>>
>>> They were actually identical until about a decade ago when
>>> commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
>>> "broken bar" to "vertical line"")
>>>
>>> which changed the | in the shared font to be a solid
>>> bar rather than a broken bar. That's the only difference.
>>>
>>> This was originally spotted by PMD which noticed that sparc does
>>> the same thing with the same data, and they also share a bunch
>>> of functions to manipulate the data. I've previously posted a near
>>> identical patch for sparc.
>>>
>>> One difference I notice in PowerPC is that there are a bunch of compile
>>> options for the .c files for the early code to avoid a bunch of security
>>> compilation features; it's not clear to me if this is a problem for
>>> this font data.
>>>
>>> Tested very lightly with a boot without FS in qemu.
>>>
>>> v2
>>> Added 'select FONT_SUPPORT' (to stop modconfig causing the font to be
>>> linked into a module rather than the main kernel)
>>> Added 'select FONTS' to satisfy requirements in lib/fonts
>>>
>>> Signed-off-by: Dr. David Alan Gilbert <[email protected]>
>>> ---
>>> arch/powerpc/Kconfig.debug | 3 +
>>> arch/powerpc/kernel/btext.c | 360 +-----------------------------------
>>> 2 files changed, 9 insertions(+), 354 deletions(-)
>>>
>>> diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
>>> index 2a54fadbeaf51..521c4baf30e88 100644
>>> --- a/arch/powerpc/Kconfig.debug
>>> +++ b/arch/powerpc/Kconfig.debug
>>> @@ -147,6 +147,9 @@ config BDI_SWITCH
>>> config BOOTX_TEXT
>>> bool "Support for early boot text console (BootX or OpenFirmware only)"
>>> depends on PPC_BOOK3S
>>> + select FONT_SUN8x16
>>> + select FONT_SUPPORT
>>> + select FONTS
>>> help
>>> Say Y here to see progress messages from the boot firmware in text
>>> mode. Requires either BootX or Open Firmware.
>>
>> kconfig tells me:
>>
>> WARNING: unmet direct dependencies detected for FONTS
>> Depends on [n]: FONT_SUPPORT [=y] && (FRAMEBUFFER_CONSOLE [=n] || STI_CONSOLE [=n])
>> Selected by [y]:
>> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
>>
>> WARNING: unmet direct dependencies detected for FONT_SUN8x16
>> Depends on [n]: FONT_SUPPORT [=y] && FRAMEBUFFER_CONSOLE [=n] && (!SPARC && FONTS [=y] || SPARC)
>> Selected by [y]:
>> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
>>
>> because FONTS depends on FRAMEBUFFER_CONSOLE || STI_CONSOLE and neither of those is set.
>
> I'm not getting the warnings in the v2, with a few configs; what command
> are using?
>

My 'make' build target is either pp32_randconfig or ppc64_randconfig.
I see kconfig warnings in > 50% of the randconfigs. (small sample size,
around 20)


> I'm tempted to change the FONT_SUN8x16 dependency line to have
> SPARC||BOOTX_TEXT or SPARC||POWERPC and drop the 'select FONTS' I
> added.
>
> Dave
>
>>
>> --
>> ~Randy

--
~Randy

2023-08-08 23:24:27

by Dr. David Alan Gilbert

[permalink] [raw]
Subject: Re: [PATCH v2] powerpc: Use shared font data

* Randy Dunlap ([email protected]) wrote:
>
>
> On 8/8/23 10:28, Dr. David Alan Gilbert wrote:
> > * Randy Dunlap ([email protected]) wrote:
> >> Hi--
> >>
> >> On 8/6/23 18:07, [email protected] wrote:
> >>> From: "Dr. David Alan Gilbert" <[email protected]>
> >>>
> >>> PowerPC has a 'btext' font used for the console which is almost identical
> >>> to the shared font_sun8x16, so use it rather than duplicating the data.
> >>>
> >>> They were actually identical until about a decade ago when
> >>> commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
> >>> "broken bar" to "vertical line"")
> >>>
> >>> which changed the | in the shared font to be a solid
> >>> bar rather than a broken bar. That's the only difference.
> >>>
> >>> This was originally spotted by PMD which noticed that sparc does
> >>> the same thing with the same data, and they also share a bunch
> >>> of functions to manipulate the data. I've previously posted a near
> >>> identical patch for sparc.
> >>>
> >>> One difference I notice in PowerPC is that there are a bunch of compile
> >>> options for the .c files for the early code to avoid a bunch of security
> >>> compilation features; it's not clear to me if this is a problem for
> >>> this font data.
> >>>
> >>> Tested very lightly with a boot without FS in qemu.
> >>>
> >>> v2
> >>> Added 'select FONT_SUPPORT' (to stop modconfig causing the font to be
> >>> linked into a module rather than the main kernel)
> >>> Added 'select FONTS' to satisfy requirements in lib/fonts
> >>>
> >>> Signed-off-by: Dr. David Alan Gilbert <[email protected]>
> >>> ---
> >>> arch/powerpc/Kconfig.debug | 3 +
> >>> arch/powerpc/kernel/btext.c | 360 +-----------------------------------
> >>> 2 files changed, 9 insertions(+), 354 deletions(-)
> >>>
> >>> diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
> >>> index 2a54fadbeaf51..521c4baf30e88 100644
> >>> --- a/arch/powerpc/Kconfig.debug
> >>> +++ b/arch/powerpc/Kconfig.debug
> >>> @@ -147,6 +147,9 @@ config BDI_SWITCH
> >>> config BOOTX_TEXT
> >>> bool "Support for early boot text console (BootX or OpenFirmware only)"
> >>> depends on PPC_BOOK3S
> >>> + select FONT_SUN8x16
> >>> + select FONT_SUPPORT
> >>> + select FONTS
> >>> help
> >>> Say Y here to see progress messages from the boot firmware in text
> >>> mode. Requires either BootX or Open Firmware.
> >>
> >> kconfig tells me:
> >>
> >> WARNING: unmet direct dependencies detected for FONTS
> >> Depends on [n]: FONT_SUPPORT [=y] && (FRAMEBUFFER_CONSOLE [=n] || STI_CONSOLE [=n])
> >> Selected by [y]:
> >> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
> >>
> >> WARNING: unmet direct dependencies detected for FONT_SUN8x16
> >> Depends on [n]: FONT_SUPPORT [=y] && FRAMEBUFFER_CONSOLE [=n] && (!SPARC && FONTS [=y] || SPARC)
> >> Selected by [y]:
> >> - BOOTX_TEXT [=y] && PPC_BOOK3S [=y]
> >>
> >> because FONTS depends on FRAMEBUFFER_CONSOLE || STI_CONSOLE and neither of those is set.
> >
> > I'm not getting the warnings in the v2, with a few configs; what command
> > are using?
> >
>
> My 'make' build target is either pp32_randconfig or ppc64_randconfig.
> I see kconfig warnings in > 50% of the randconfigs. (small sample size,
> around 20)

Thanks, that triggers it for me; I'll have a discussion with it....

Dave

>
> > I'm tempted to change the FONT_SUN8x16 dependency line to have
> > SPARC||BOOTX_TEXT or SPARC||POWERPC and drop the 'select FONTS' I
> > added.
> >
> > Dave
> >
> >>
> >> --
> >> ~Randy
>
> --
> ~Randy
--
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \
\ dave @ treblig.org | | In Hex /
\ _________________________|_____ http://www.treblig.org |_______/