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0f1991949d
sparc 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 bcfbeecea1 ("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 PPC does
the same thing with the same data, and they also share a bunch
of functions to manipulate the data.
Tested very lightly with a boot without FS in qemu.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Link: https://lore.kernel.org/r/20230807010914.799713-1-linux@treblig.org
326 lines
7.2 KiB
C
326 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Procedures for drawing on the screen early on in the boot process.
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*
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* Benjamin Herrenschmidt <benh@kernel.crashing.org>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/font.h>
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#include <asm/btext.h>
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#include <asm/oplib.h>
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#include <asm/io.h>
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#define NO_SCROLL
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#ifndef NO_SCROLL
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static void scrollscreen(void);
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#endif
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static void draw_byte(unsigned char c, long locX, long locY);
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static void draw_byte_32(const unsigned char *bits, unsigned int *base, int rb);
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static void draw_byte_16(const unsigned char *bits, unsigned int *base, int rb);
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static void draw_byte_8(const unsigned char *bits, unsigned int *base, int rb);
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#define __force_data __section(".data")
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static int g_loc_X __force_data;
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static int g_loc_Y __force_data;
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static int g_max_loc_X __force_data;
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static int g_max_loc_Y __force_data;
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static int dispDeviceRowBytes __force_data;
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static int dispDeviceDepth __force_data;
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static int dispDeviceRect[4] __force_data;
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static unsigned char *dispDeviceBase __force_data;
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static int __init btext_initialize(phandle node)
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{
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unsigned int width, height, depth, pitch;
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unsigned long address = 0;
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u32 prop;
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if (prom_getproperty(node, "width", (char *)&width, 4) < 0)
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return -EINVAL;
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if (prom_getproperty(node, "height", (char *)&height, 4) < 0)
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return -EINVAL;
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if (prom_getproperty(node, "depth", (char *)&depth, 4) < 0)
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return -EINVAL;
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pitch = width * ((depth + 7) / 8);
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if (prom_getproperty(node, "linebytes", (char *)&prop, 4) >= 0 &&
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prop != 0xffffffffu)
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pitch = prop;
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if (pitch == 1)
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pitch = 0x1000;
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if (prom_getproperty(node, "address", (char *)&prop, 4) >= 0)
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address = prop;
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/* FIXME: Add support for PCI reg properties. Right now, only
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* reliable on macs
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*/
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if (address == 0)
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return -EINVAL;
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g_loc_X = 0;
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g_loc_Y = 0;
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g_max_loc_X = width / 8;
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g_max_loc_Y = height / 16;
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dispDeviceBase = (unsigned char *)address;
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dispDeviceRowBytes = pitch;
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dispDeviceDepth = depth == 15 ? 16 : depth;
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dispDeviceRect[0] = dispDeviceRect[1] = 0;
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dispDeviceRect[2] = width;
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dispDeviceRect[3] = height;
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return 0;
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}
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/* Calc the base address of a given point (x,y) */
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static unsigned char * calc_base(int x, int y)
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{
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unsigned char *base = dispDeviceBase;
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base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3);
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base += (y + dispDeviceRect[1]) * dispDeviceRowBytes;
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return base;
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}
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static void btext_clearscreen(void)
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{
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unsigned int *base = (unsigned int *)calc_base(0, 0);
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unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
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(dispDeviceDepth >> 3)) >> 2;
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int i,j;
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for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++)
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{
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unsigned int *ptr = base;
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for(j=width; j; --j)
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*(ptr++) = 0;
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base += (dispDeviceRowBytes >> 2);
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}
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}
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#ifndef NO_SCROLL
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static void scrollscreen(void)
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{
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unsigned int *src = (unsigned int *)calc_base(0,16);
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unsigned int *dst = (unsigned int *)calc_base(0,0);
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unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
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(dispDeviceDepth >> 3)) >> 2;
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int i,j;
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for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++)
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{
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unsigned int *src_ptr = src;
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unsigned int *dst_ptr = dst;
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for(j=width; j; --j)
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*(dst_ptr++) = *(src_ptr++);
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src += (dispDeviceRowBytes >> 2);
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dst += (dispDeviceRowBytes >> 2);
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}
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for (i=0; i<16; i++)
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{
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unsigned int *dst_ptr = dst;
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for(j=width; j; --j)
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*(dst_ptr++) = 0;
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dst += (dispDeviceRowBytes >> 2);
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}
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}
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#endif /* ndef NO_SCROLL */
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static void btext_drawchar(char c)
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{
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int cline = 0;
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#ifdef NO_SCROLL
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int x;
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#endif
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switch (c) {
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case '\b':
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if (g_loc_X > 0)
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--g_loc_X;
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break;
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case '\t':
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g_loc_X = (g_loc_X & -8) + 8;
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break;
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case '\r':
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g_loc_X = 0;
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break;
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case '\n':
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g_loc_X = 0;
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g_loc_Y++;
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cline = 1;
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break;
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default:
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draw_byte(c, g_loc_X++, g_loc_Y);
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}
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if (g_loc_X >= g_max_loc_X) {
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g_loc_X = 0;
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g_loc_Y++;
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cline = 1;
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}
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#ifndef NO_SCROLL
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while (g_loc_Y >= g_max_loc_Y) {
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scrollscreen();
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g_loc_Y--;
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}
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#else
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/* wrap around from bottom to top of screen so we don't
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waste time scrolling each line. -- paulus. */
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if (g_loc_Y >= g_max_loc_Y)
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g_loc_Y = 0;
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if (cline) {
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for (x = 0; x < g_max_loc_X; ++x)
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draw_byte(' ', x, g_loc_Y);
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}
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#endif
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}
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static void btext_drawtext(const char *c, unsigned int len)
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{
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while (len--)
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btext_drawchar(*c++);
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}
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static void draw_byte(unsigned char c, long locX, long locY)
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{
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unsigned char *base = calc_base(locX << 3, locY << 4);
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unsigned int font_index = c * 16;
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const unsigned char *font = font_sun_8x16.data + font_index;
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int rb = dispDeviceRowBytes;
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switch(dispDeviceDepth) {
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case 24:
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case 32:
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draw_byte_32(font, (unsigned int *)base, rb);
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break;
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case 15:
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case 16:
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draw_byte_16(font, (unsigned int *)base, rb);
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break;
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case 8:
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draw_byte_8(font, (unsigned int *)base, rb);
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break;
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}
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}
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static unsigned int expand_bits_8[16] = {
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0x00000000,
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0x000000ff,
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0x0000ff00,
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0x0000ffff,
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0x00ff0000,
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0x00ff00ff,
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0x00ffff00,
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0x00ffffff,
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0xff000000,
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0xff0000ff,
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0xff00ff00,
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0xff00ffff,
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0xffff0000,
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0xffff00ff,
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0xffffff00,
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0xffffffff
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};
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static unsigned int expand_bits_16[4] = {
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0x00000000,
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0x0000ffff,
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0xffff0000,
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0xffffffff
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};
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static void draw_byte_32(const unsigned char *font, unsigned int *base, int rb)
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{
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int l, bits;
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int fg = 0xFFFFFFFFUL;
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int bg = 0x00000000UL;
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for (l = 0; l < 16; ++l)
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{
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bits = *font++;
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base[0] = (-(bits >> 7) & fg) ^ bg;
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base[1] = (-((bits >> 6) & 1) & fg) ^ bg;
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base[2] = (-((bits >> 5) & 1) & fg) ^ bg;
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base[3] = (-((bits >> 4) & 1) & fg) ^ bg;
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base[4] = (-((bits >> 3) & 1) & fg) ^ bg;
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base[5] = (-((bits >> 2) & 1) & fg) ^ bg;
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base[6] = (-((bits >> 1) & 1) & fg) ^ bg;
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base[7] = (-(bits & 1) & fg) ^ bg;
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base = (unsigned int *) ((char *)base + rb);
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}
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}
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static void draw_byte_16(const unsigned char *font, unsigned int *base, int rb)
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{
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int l, bits;
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int fg = 0xFFFFFFFFUL;
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int bg = 0x00000000UL;
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unsigned int *eb = (int *)expand_bits_16;
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for (l = 0; l < 16; ++l)
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{
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bits = *font++;
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base[0] = (eb[bits >> 6] & fg) ^ bg;
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base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg;
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base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg;
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base[3] = (eb[bits & 3] & fg) ^ bg;
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base = (unsigned int *) ((char *)base + rb);
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}
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}
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static void draw_byte_8(const unsigned char *font, unsigned int *base, int rb)
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{
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int l, bits;
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int fg = 0x0F0F0F0FUL;
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int bg = 0x00000000UL;
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unsigned int *eb = (int *)expand_bits_8;
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for (l = 0; l < 16; ++l)
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{
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bits = *font++;
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base[0] = (eb[bits >> 4] & fg) ^ bg;
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base[1] = (eb[bits & 0xf] & fg) ^ bg;
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base = (unsigned int *) ((char *)base + rb);
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}
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}
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static void btext_console_write(struct console *con, const char *s,
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unsigned int n)
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{
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btext_drawtext(s, n);
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}
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static struct console btext_console = {
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.name = "btext",
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.write = btext_console_write,
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.flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
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.index = 0,
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};
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int __init btext_find_display(void)
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{
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phandle node;
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char type[32];
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int ret;
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node = prom_inst2pkg(prom_stdout);
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if (prom_getproperty(node, "device_type", type, 32) < 0)
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return -ENODEV;
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if (strcmp(type, "display"))
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return -ENODEV;
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ret = btext_initialize(node);
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if (!ret) {
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btext_clearscreen();
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register_console(&btext_console);
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}
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return ret;
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}
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