305 lines
7.2 KiB
C
305 lines
7.2 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* VESA text modes
|
|
*/
|
|
|
|
#include "boot.h"
|
|
#include "video.h"
|
|
#include "vesa.h"
|
|
|
|
/* VESA information */
|
|
static struct vesa_general_info vginfo;
|
|
static struct vesa_mode_info vminfo;
|
|
|
|
__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)
|
|
{
|
|
#if defined(CONFIG_VIDEO_VESA) || defined(CONFIG_FIRMWARE_EDID)
|
|
u16 ax, cx, di;
|
|
u16 mode;
|
|
addr_t mode_ptr;
|
|
struct mode_info *mi;
|
|
int nmodes = 0;
|
|
|
|
video_vesa.modes = GET_HEAP(struct mode_info, 0);
|
|
|
|
ax = 0x4f00;
|
|
di = (size_t)&vginfo;
|
|
asm(INT10
|
|
: "+a" (ax), "+D" (di), "=m" (vginfo)
|
|
: : "ebx", "ecx", "edx", "esi");
|
|
|
|
if (ax != 0x004f ||
|
|
vginfo.signature != VESA_MAGIC ||
|
|
vginfo.version < 0x0102)
|
|
return 0; /* Not present */
|
|
#endif /* CONFIG_VIDEO_VESA || CONFIG_FIRMWARE_EDID */
|
|
#ifdef CONFIG_VIDEO_VESA
|
|
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... */
|
|
|
|
ax = 0x4f01;
|
|
cx = mode;
|
|
di = (size_t)&vminfo;
|
|
asm(INT10
|
|
: "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)
|
|
: : "ebx", "edx", "esi");
|
|
|
|
if (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_FB
|
|
/* 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.
|
|
We don't require CONFIG_FB_VESA, however, since
|
|
some of the other framebuffer drivers can use
|
|
this mode-setting, too. */
|
|
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;
|
|
#else
|
|
return 0;
|
|
#endif /* CONFIG_VIDEO_VESA */
|
|
}
|
|
|
|
static int vesa_set_mode(struct mode_info *mode)
|
|
{
|
|
u16 ax, bx, cx, di;
|
|
int is_graphic;
|
|
u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA;
|
|
|
|
memset(&vminfo, 0, sizeof vminfo); /* Just in case... */
|
|
|
|
ax = 0x4f01;
|
|
cx = vesa_mode;
|
|
di = (size_t)&vminfo;
|
|
asm(INT10
|
|
: "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo)
|
|
: : "ebx", "edx", "esi");
|
|
|
|
if (ax != 0x004f)
|
|
return -1;
|
|
|
|
if ((vminfo.mode_attr & 0x15) == 0x05) {
|
|
/* It's a supported text mode */
|
|
is_graphic = 0;
|
|
} 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 */
|
|
} else {
|
|
return -1; /* Invalid mode */
|
|
}
|
|
|
|
|
|
ax = 0x4f02;
|
|
bx = vesa_mode;
|
|
di = 0;
|
|
asm volatile(INT10
|
|
: "+a" (ax), "+b" (bx), "+D" (di)
|
|
: : "ecx", "edx", "esi");
|
|
|
|
if (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)
|
|
{
|
|
u8 dac_size = 6;
|
|
|
|
/* If possible, switch the DAC to 8-bit mode */
|
|
if (vginfo.capabilities & 1) {
|
|
u16 ax, bx;
|
|
|
|
ax = 0x4f08;
|
|
bx = 0x0800;
|
|
asm volatile(INT10
|
|
: "+a" (ax), "+b" (bx)
|
|
: : "ecx", "edx", "esi", "edi");
|
|
|
|
if (ax == 0x004f)
|
|
dac_size = bx >> 8;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
u16 ax, bx, di, es;
|
|
|
|
ax = 0x4f0a;
|
|
bx = di = 0;
|
|
asm("pushw %%es; "INT10"; movw %%es,%0; popw %%es"
|
|
: "=d" (es), "+a" (ax), "+b" (bx), "+D" (di)
|
|
: : "ecx", "esi");
|
|
|
|
if (ax != 0x004f)
|
|
return;
|
|
|
|
boot_params.screen_info.vesapm_seg = es;
|
|
boot_params.screen_info.vesapm_off = 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 = 0x23;
|
|
|
|
/* 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
|
|
u16 ax, bx, cx, dx, di;
|
|
|
|
/* 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+ */
|
|
|
|
ax = 0x4f15; /* VBE DDC */
|
|
bx = 0x0000; /* Report DDC capabilities */
|
|
cx = 0; /* Controller 0 */
|
|
di = 0; /* ES:DI must be 0 by spec */
|
|
|
|
/* Note: The VBE DDC spec is different from the main VESA spec;
|
|
we genuinely have to assume all registers are destroyed here. */
|
|
|
|
asm("pushw %%es; movw %2,%%es; "INT10"; popw %%es"
|
|
: "+a" (ax), "+b" (bx)
|
|
: "c" (cx), "D" (di)
|
|
: "esi");
|
|
|
|
if (ax != 0x004f)
|
|
return; /* No EDID */
|
|
|
|
/* BH = time in seconds to transfer EDD information */
|
|
/* BL = DDC level supported */
|
|
|
|
ax = 0x4f15; /* VBE DDC */
|
|
bx = 0x0001; /* Read EDID */
|
|
cx = 0; /* Controller 0 */
|
|
dx = 0; /* EDID block number */
|
|
di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */
|
|
asm(INT10
|
|
: "+a" (ax), "+b" (bx), "+d" (dx), "=m" (boot_params.edid_info)
|
|
: "c" (cx), "D" (di)
|
|
: "esi");
|
|
#endif /* CONFIG_FIRMWARE_EDID */
|
|
}
|
|
|
|
#endif /* not _WAKEUP */
|
|
|
|
__videocard video_vesa =
|
|
{
|
|
.card_name = "VESA",
|
|
.probe = vesa_probe,
|
|
.set_mode = vesa_set_mode,
|
|
.xmode_first = VIDEO_FIRST_VESA,
|
|
.xmode_n = 0x200,
|
|
};
|