79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
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* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation;
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* either version 2, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE.See the GNU General Public License
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* for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "global.h"
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/* Get frame buffer size from VGA BIOS */
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unsigned int viafb_get_memsize(void)
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{
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unsigned int m;
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/* If memory size provided by user */
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if (viafb_memsize)
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m = viafb_memsize * Mb;
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else {
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m = (unsigned int)viafb_read_reg(VIASR, SR39);
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m = m * (4 * Mb);
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if ((m < (16 * Mb)) || (m > (64 * Mb)))
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m = 16 * Mb;
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}
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DEBUG_MSG(KERN_INFO "framebuffer size = %d Mb\n", m / Mb);
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return m;
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}
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/* Get Video Buffer Starting Physical Address(back door)*/
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unsigned long viafb_get_videobuf_addr(void)
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{
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struct pci_dev *pdev = NULL;
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unsigned char sys_mem;
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unsigned char video_mem;
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unsigned long sys_mem_size;
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unsigned long video_mem_size;
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/*system memory = 256 MB, video memory 64 MB */
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unsigned long vmem_starting_adr = 0x0C000000;
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pdev =
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(struct pci_dev *)pci_get_device(VIA_K800_BRIDGE_VID,
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VIA_K800_BRIDGE_DID, NULL);
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if (pdev != NULL) {
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pci_read_config_byte(pdev, VIA_K800_SYSTEM_MEMORY_REG,
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&sys_mem);
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pci_read_config_byte(pdev, VIA_K800_VIDEO_MEMORY_REG,
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&video_mem);
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video_mem = (video_mem & 0x70) >> 4;
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sys_mem_size = ((unsigned long)sys_mem) << 24;
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if (video_mem != 0)
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video_mem_size = (1 << (video_mem)) * 1024 * 1024;
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else
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video_mem_size = 0;
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vmem_starting_adr = sys_mem_size - video_mem_size;
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pci_dev_put(pdev);
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}
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DEBUG_MSG(KERN_INFO "Video Memory Starting Address = %lx \n",
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vmem_starting_adr);
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return vmem_starting_adr;
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}
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