linux/arch/x86/boot/video-vesa.c
Peter Korsgaard 1722770f13 x86-boot: don't request VBE2 information
The new x86 setup code (4fd06960f1) broke booting on an old P3/500MHz
with an onboard Voodoo3 of mine. After debugging it, it turned out
to be caused by the fact that the vesa probing now asks for VBE2 data.

Disassembing the video BIOS shows that it overflows the vesa_general_info
structure when VBE2 data is requested because the source addresses for the
information strings which get strcpy'ed to the buffer lie outside the 32K
BIOS code (and hence contain long sequences of 0xff's).

E.G.:

get_vbe_controller_info:
00002A9C  60                pushaw
00002A9D  1E                push ds
00002A9E  0E                push cs
00002A9F  1F                pop ds
00002AA0  2BC9              sub cx,cx
00002AA2  6626813D56424532  cmp dword [es:di],0x32454256 ; "VBE2"
00002AAA  7501              jnz .1
00002AAC  41                inc cx
.1:
00002AAD  51                push cx
00002AAE  B91400            mov cx,0x14
00002AB1  BED47F            mov si, controller_header
00002AB4  57                push di
00002AB5  F3A4              rep movsb ; copy vbe1.2 header

00002AB7  B9EC00            mov cx,0xec
00002ABA  2AC0              sub al,al
00002ABC  F3AA              rep stosb ; zero pad remainder

00002ABE  5F                pop di
00002ABF  E8EB0D            call word get_memory
00002AC2  C1E002            shl ax,0x2
00002AC5  26894512          mov [es:di+0x12],ax ; total memory
00002AC9  26C745040003      mov word [es:di+0x4],0x300 ; VBE version
00002ACF  268C4D08          mov [es:di+0x8],cs
00002AD3  268C4D10          mov [es:di+0x10],cs
00002AD7  59                pop cx
00002AD8  E361              jcxz .done ; VBE2 requested?
00002ADA  8D9D0001          lea bx,[di+0x100]
00002ADE  53                push bx
00002ADF  87DF              xchg bx,di ; di now points to 2nd half
00002AE1  26C747140001      mov word [es:bx+0x14],0x100 ; sw rev

00002AE7  26897F06          mov [es:bx+0x6],di		; oem string
00002AEB  268C4708          mov [es:bx+0x8],es
00002AEF  BE5280            mov si,0x8052 ; oem string
00002AF2  E87A1B            call word strcpy

00002AF5  26897F0E          mov [es:bx+0xe],di ; video mode list
00002AF9  268C4710          mov [es:bx+0x10],es
00002AFD  B91E00            mov cx,0x1e
00002B00  BEE87F            mov si,vidmodes
00002B03  F3A5              rep movsw

00002B05  26897F16          mov [es:bx+0x16],di ; oem vendor
00002B09  268C4718          mov [es:bx+0x18],es
00002B0D  BE2480            mov si,0x8024 ; oem vendor
00002B10  E85C1B            call word strcpy

00002B13  26897F1A          mov [es:bx+0x1a],di ; oem product
00002B17  268C471C          mov [es:bx+0x1c],es
00002B1B  BE3880            mov si,0x8038 ; oem product
00002B1E  E84E1B            call word strcpy

00002B21  26897F1E          mov [es:bx+0x1e],di ; oem product rev
00002B25  268C4720          mov [es:bx+0x20],es
00002B29  BE4580            mov si,0x8045 ; oem product rev
00002B2C  E8401B            call word strcpy

00002B2F  58                pop ax
00002B30  B90001            mov cx,0x100
00002B33  2BCF              sub cx,di
00002B35  03C8              add cx,ax
00002B37  2AC0              sub al,al
00002B39  F3AA              rep stosb ; zero pad
.done:
00002B3B  1F                pop ds
00002B3C  61                popaw
00002B3D  B84F00            mov ax,0x4f
00002B40  C3                ret

(The full BIOS can be found at http://peter.korsgaard.com/vgabios.bin
if interested).

The old setup code didn't ask for VBE2 info, and the new code doesn't
actually do anything with the extra information, so the fix is to simply
not request it. Other BIOS'es might have the same problem.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07 16:39:14 +01:00

298 lines
7.1 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.
*
* ----------------------------------------------------------------------- */
/*
* arch/i386/boot/video-vesa.c
*
* 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;
static void vesa_store_mode_params_graphics(void);
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;
}
/* 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 */
}
__videocard video_vesa =
{
.card_name = "VESA",
.probe = vesa_probe,
.set_mode = vesa_set_mode,
.xmode_first = VIDEO_FIRST_VESA,
.xmode_n = 0x200,
};