mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Michal Suchanek](/assets/img/avatar_default.png)
Since switch to simplefb/simpledrm VESA graphic mode selection with vga=
kernel parameter is no longer available with legacy BIOS.
The x86 realmode boot code enables the VESA graphic modes when option
FB_BOOT_VESA_SUPPORT is enabled.
This option is selected by vesafb but not simplefb/simpledrm.
To enable use of VESA modes with simplefb in legacy BIOS boot mode drop
dependency of BOOT_VESA_SUPPORT on FB, also drop the FB_ prefix. Select
the option from sysfb rather than the drivers that depend on it.
The BOOT_VESA_SUPPORT is not specific to framebuffer but rather to x86
platform, move it from fbdev to x86 Kconfig.
Fixes: e3263ab389
("x86: provide platform-devices for boot-framebuffers")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/948c39940a4e99f5b43bdbcbe537faae71a43e1d.1645822213.git.msuchanek@suse.de
279 lines
6.6 KiB
C
279 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
* Copyright 2009 Intel Corporation; author H. Peter Anvin
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* VESA text modes
|
|
*/
|
|
|
|
#include "boot.h"
|
|
#include "video.h"
|
|
#include "vesa.h"
|
|
#include "string.h"
|
|
|
|
/* VESA information */
|
|
static struct vesa_general_info vginfo;
|
|
static struct vesa_mode_info vminfo;
|
|
|
|
static __videocard video_vesa;
|
|
|
|
#ifndef _WAKEUP
|
|
static void vesa_store_mode_params_graphics(void);
|
|
#else /* _WAKEUP */
|
|
static inline void vesa_store_mode_params_graphics(void) {}
|
|
#endif /* _WAKEUP */
|
|
|
|
static int vesa_probe(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
u16 mode;
|
|
addr_t mode_ptr;
|
|
struct mode_info *mi;
|
|
int nmodes = 0;
|
|
|
|
video_vesa.modes = GET_HEAP(struct mode_info, 0);
|
|
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f00;
|
|
ireg.di = (size_t)&vginfo;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f ||
|
|
vginfo.signature != VESA_MAGIC ||
|
|
vginfo.version < 0x0102)
|
|
return 0; /* Not present */
|
|
|
|
set_fs(vginfo.video_mode_ptr.seg);
|
|
mode_ptr = vginfo.video_mode_ptr.off;
|
|
|
|
while ((mode = rdfs16(mode_ptr)) != 0xffff) {
|
|
mode_ptr += 2;
|
|
|
|
if (!heap_free(sizeof(struct mode_info)))
|
|
break; /* Heap full, can't save mode info */
|
|
|
|
if (mode & ~0x1ff)
|
|
continue;
|
|
|
|
memset(&vminfo, 0, sizeof(vminfo)); /* Just in case... */
|
|
|
|
ireg.ax = 0x4f01;
|
|
ireg.cx = mode;
|
|
ireg.di = (size_t)&vminfo;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f)
|
|
continue;
|
|
|
|
if ((vminfo.mode_attr & 0x15) == 0x05) {
|
|
/* Text Mode, TTY BIOS supported,
|
|
supported by hardware */
|
|
mi = GET_HEAP(struct mode_info, 1);
|
|
mi->mode = mode + VIDEO_FIRST_VESA;
|
|
mi->depth = 0; /* text */
|
|
mi->x = vminfo.h_res;
|
|
mi->y = vminfo.v_res;
|
|
nmodes++;
|
|
} else if ((vminfo.mode_attr & 0x99) == 0x99 &&
|
|
(vminfo.memory_layout == 4 ||
|
|
vminfo.memory_layout == 6) &&
|
|
vminfo.memory_planes == 1) {
|
|
#ifdef CONFIG_BOOT_VESA_SUPPORT
|
|
/* Graphics mode, color, linear frame buffer
|
|
supported. Only register the mode if
|
|
if framebuffer is configured, however,
|
|
otherwise the user will be left without a screen. */
|
|
mi = GET_HEAP(struct mode_info, 1);
|
|
mi->mode = mode + VIDEO_FIRST_VESA;
|
|
mi->depth = vminfo.bpp;
|
|
mi->x = vminfo.h_res;
|
|
mi->y = vminfo.v_res;
|
|
nmodes++;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return nmodes;
|
|
}
|
|
|
|
static int vesa_set_mode(struct mode_info *mode)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
int is_graphic;
|
|
u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;
|
|
|
|
memset(&vminfo, 0, sizeof(vminfo)); /* Just in case... */
|
|
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f01;
|
|
ireg.cx = vesa_mode;
|
|
ireg.di = (size_t)&vminfo;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f)
|
|
return -1;
|
|
|
|
if ((vminfo.mode_attr & 0x15) == 0x05) {
|
|
/* It's a supported text mode */
|
|
is_graphic = 0;
|
|
#ifdef CONFIG_BOOT_VESA_SUPPORT
|
|
} else if ((vminfo.mode_attr & 0x99) == 0x99) {
|
|
/* It's a graphics mode with linear frame buffer */
|
|
is_graphic = 1;
|
|
vesa_mode |= 0x4000; /* Request linear frame buffer */
|
|
#endif
|
|
} else {
|
|
return -1; /* Invalid mode */
|
|
}
|
|
|
|
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f02;
|
|
ireg.bx = vesa_mode;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f)
|
|
return -1;
|
|
|
|
graphic_mode = is_graphic;
|
|
if (!is_graphic) {
|
|
/* Text mode */
|
|
force_x = mode->x;
|
|
force_y = mode->y;
|
|
do_restore = 1;
|
|
} else {
|
|
/* Graphics mode */
|
|
vesa_store_mode_params_graphics();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifndef _WAKEUP
|
|
|
|
/* Switch DAC to 8-bit mode */
|
|
static void vesa_dac_set_8bits(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
u8 dac_size = 6;
|
|
|
|
/* If possible, switch the DAC to 8-bit mode */
|
|
if (vginfo.capabilities & 1) {
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f08;
|
|
ireg.bh = 0x08;
|
|
intcall(0x10, &ireg, &oreg);
|
|
if (oreg.ax == 0x004f)
|
|
dac_size = oreg.bh;
|
|
}
|
|
|
|
/* Set the color sizes to the DAC size, and offsets to 0 */
|
|
boot_params.screen_info.red_size = dac_size;
|
|
boot_params.screen_info.green_size = dac_size;
|
|
boot_params.screen_info.blue_size = dac_size;
|
|
boot_params.screen_info.rsvd_size = dac_size;
|
|
|
|
boot_params.screen_info.red_pos = 0;
|
|
boot_params.screen_info.green_pos = 0;
|
|
boot_params.screen_info.blue_pos = 0;
|
|
boot_params.screen_info.rsvd_pos = 0;
|
|
}
|
|
|
|
/* Save the VESA protected mode info */
|
|
static void vesa_store_pm_info(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f0a;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f)
|
|
return;
|
|
|
|
boot_params.screen_info.vesapm_seg = oreg.es;
|
|
boot_params.screen_info.vesapm_off = oreg.di;
|
|
}
|
|
|
|
/*
|
|
* Save video mode parameters for graphics mode
|
|
*/
|
|
static void vesa_store_mode_params_graphics(void)
|
|
{
|
|
/* Tell the kernel we're in VESA graphics mode */
|
|
boot_params.screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;
|
|
|
|
/* Mode parameters */
|
|
boot_params.screen_info.vesa_attributes = vminfo.mode_attr;
|
|
boot_params.screen_info.lfb_linelength = vminfo.logical_scan;
|
|
boot_params.screen_info.lfb_width = vminfo.h_res;
|
|
boot_params.screen_info.lfb_height = vminfo.v_res;
|
|
boot_params.screen_info.lfb_depth = vminfo.bpp;
|
|
boot_params.screen_info.pages = vminfo.image_planes;
|
|
boot_params.screen_info.lfb_base = vminfo.lfb_ptr;
|
|
memcpy(&boot_params.screen_info.red_size,
|
|
&vminfo.rmask, 8);
|
|
|
|
/* General parameters */
|
|
boot_params.screen_info.lfb_size = vginfo.total_memory;
|
|
|
|
if (vminfo.bpp <= 8)
|
|
vesa_dac_set_8bits();
|
|
|
|
vesa_store_pm_info();
|
|
}
|
|
|
|
/*
|
|
* Save EDID information for the kernel; this is invoked, separately,
|
|
* after mode-setting.
|
|
*/
|
|
void vesa_store_edid(void)
|
|
{
|
|
#ifdef CONFIG_FIRMWARE_EDID
|
|
struct biosregs ireg, oreg;
|
|
|
|
/* Apparently used as a nonsense token... */
|
|
memset(&boot_params.edid_info, 0x13, sizeof(boot_params.edid_info));
|
|
|
|
if (vginfo.version < 0x0200)
|
|
return; /* EDID requires VBE 2.0+ */
|
|
|
|
initregs(&ireg);
|
|
ireg.ax = 0x4f15; /* VBE DDC */
|
|
/* ireg.bx = 0x0000; */ /* Report DDC capabilities */
|
|
/* ireg.cx = 0; */ /* Controller 0 */
|
|
ireg.es = 0; /* ES:DI must be 0 by spec */
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
if (oreg.ax != 0x004f)
|
|
return; /* No EDID */
|
|
|
|
/* BH = time in seconds to transfer EDD information */
|
|
/* BL = DDC level supported */
|
|
|
|
ireg.ax = 0x4f15; /* VBE DDC */
|
|
ireg.bx = 0x0001; /* Read EDID */
|
|
/* ireg.cx = 0; */ /* Controller 0 */
|
|
/* ireg.dx = 0; */ /* EDID block number */
|
|
ireg.es = ds();
|
|
ireg.di =(size_t)&boot_params.edid_info; /* (ES:)Pointer to block */
|
|
intcall(0x10, &ireg, &oreg);
|
|
#endif /* CONFIG_FIRMWARE_EDID */
|
|
}
|
|
|
|
#endif /* not _WAKEUP */
|
|
|
|
static __videocard video_vesa =
|
|
{
|
|
.card_name = "VESA",
|
|
.probe = vesa_probe,
|
|
.set_mode = vesa_set_mode,
|
|
.xmode_first = VIDEO_FIRST_VESA,
|
|
.xmode_n = 0x200,
|
|
};
|