arch/x86/boot/video-vesa.c - maze/linux - Git at Google

 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright (C) 1991, 1992 Linus Torvalds
  *   Copyright 2007 rPath, Inc. - All Rights Reserved
  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
  *
  *   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;

 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_FB_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_FB_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,
 };
	/* -- linux-c -- ------------------------------------------------------- *
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	* Copyright 2007 rPath, Inc. - All Rights Reserved
	* Copyright 2009 Intel Corporation; author H. Peter Anvin
	*
	* 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;

	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_FB_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_FB_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,
	};