mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 12:52:30 +00:00
c91b557ad0
iface.c, iface.h: support getting video memory from backdoor. ioctl.c, ioctl.h: support user mode application with additional information Signed-off-by: Joseph Chan <josephchan@via.com.tw> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
|
|
* Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
|
|
* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation;
|
|
* either version 2, or (at your option) any later version.
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
|
|
* the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
* A PARTICULAR PURPOSE.See the GNU General Public License
|
|
* for more details.
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "global.h"
|
|
|
|
/* Get frame buffer size from VGA BIOS */
|
|
|
|
unsigned int viafb_get_memsize(void)
|
|
{
|
|
unsigned int m;
|
|
|
|
/* If memory size provided by user */
|
|
if (viafb_memsize)
|
|
m = viafb_memsize * Mb;
|
|
else {
|
|
m = (unsigned int)viafb_read_reg(VIASR, SR39);
|
|
m = m * (4 * Mb);
|
|
|
|
if ((m < (16 * Mb)) || (m > (64 * Mb)))
|
|
m = 16 * Mb;
|
|
}
|
|
DEBUG_MSG(KERN_INFO "framebuffer size = %d Mb\n", m / Mb);
|
|
return m;
|
|
}
|
|
|
|
/* Get Video Buffer Starting Physical Address(back door)*/
|
|
|
|
unsigned long viafb_get_videobuf_addr(void)
|
|
{
|
|
struct pci_dev *pdev = NULL;
|
|
unsigned char sys_mem;
|
|
unsigned char video_mem;
|
|
unsigned long sys_mem_size;
|
|
unsigned long video_mem_size;
|
|
/*system memory = 256 MB, video memory 64 MB */
|
|
unsigned long vmem_starting_adr = 0x0C000000;
|
|
|
|
pdev =
|
|
(struct pci_dev *)pci_get_device(VIA_K800_BRIDGE_VID,
|
|
VIA_K800_BRIDGE_DID, NULL);
|
|
if (pdev != NULL) {
|
|
pci_read_config_byte(pdev, VIA_K800_SYSTEM_MEMORY_REG,
|
|
&sys_mem);
|
|
pci_read_config_byte(pdev, VIA_K800_VIDEO_MEMORY_REG,
|
|
&video_mem);
|
|
video_mem = (video_mem & 0x70) >> 4;
|
|
sys_mem_size = ((unsigned long)sys_mem) << 24;
|
|
if (video_mem != 0)
|
|
video_mem_size = (1 << (video_mem)) * 1024 * 1024;
|
|
else
|
|
video_mem_size = 0;
|
|
|
|
vmem_starting_adr = sys_mem_size - video_mem_size;
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
DEBUG_MSG(KERN_INFO "Video Memory Starting Address = %lx \n",
|
|
vmem_starting_adr);
|
|
return vmem_starting_adr;
|
|
}
|