vesa.c

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/*-
 * Copyright (c) 1998 Kazutaka YOKOTA and Michael Smith
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer as
 *    the first lines of this file unmodified.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: vesa.c,v 1.15.2.5 1999/04/16 15:58:21 jlemon Exp $
 */

#include "vga.h"
#include "opt_vga.h"
#include "opt_vesa.h"
#include "opt_vm86.h"
#include "opt_fb.h"

#ifdef VGA_NO_MODE_CHANGE
#undef VESA
#endif

#if (NVGA > 0 && defined(VESA) && defined(VM86)) || defined(KLD_MODULE)

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <vm/vm.h>
#include <vm/pmap.h>

#include <machine/console.h>
#include <machine/md_var.h>
#include <machine/vm86.h>
#include <machine/pc/bios.h>
#include <machine/pc/vesa.h>

#include <dev/fb/fbreg.h>
#include <dev/fb/vgareg.h>

#ifndef __i386__
#include <isa/isareg.h>
#else
#include <i386/isa/isa.h>
#endif

#ifndef VESA_DEBUG
#define VESA_DEBUG	0
#endif

/* VESA video adapter state buffer stub */
struct adp_state {
	int		sig;
#define V_STATE_SIG	0x61736576
	u_char		regs[1];
};
typedef struct adp_state adp_state_t;

/* VESA video adapter */
static video_adapter_t *vesa_adp = NULL;
static int vesa_state_buf_size = 0;
#if 0
static void *vesa_state_buf = NULL;
#endif

/* VESA functions */
static int			vesa_nop(void);
static vi_probe_t		vesa_probe;
static vi_init_t		vesa_init;
static vi_get_info_t		vesa_get_info;
static vi_query_mode_t		vesa_query_mode;
static vi_set_mode_t		vesa_set_mode;
static vi_save_font_t		vesa_save_font;
static vi_load_font_t		vesa_load_font;
static vi_show_font_t		vesa_show_font;
static vi_save_palette_t	vesa_save_palette;
static vi_load_palette_t	vesa_load_palette;
static vi_set_border_t		vesa_set_border;
static vi_save_state_t		vesa_save_state;
static vi_load_state_t		vesa_load_state;
static vi_set_win_org_t		vesa_set_origin;
static vi_read_hw_cursor_t	vesa_read_hw_cursor;
static vi_set_hw_cursor_t	vesa_set_hw_cursor;
static vi_set_hw_cursor_shape_t	vesa_set_hw_cursor_shape;
static vi_mmap_t		vesa_mmap;
static vi_diag_t		vesa_diag;
static struct vm86context	vesa_vmcontext;

static video_switch_t vesavidsw = {
	vesa_probe,
	vesa_init,
	vesa_get_info,
	vesa_query_mode,
	vesa_set_mode,
	vesa_save_font,
	vesa_load_font,
	vesa_show_font,
	vesa_save_palette,
	vesa_load_palette,
	vesa_set_border,
	vesa_save_state,
	vesa_load_state,
	vesa_set_origin,
	vesa_read_hw_cursor,
	vesa_set_hw_cursor,
	vesa_set_hw_cursor_shape,
	(vi_blank_display_t *)vesa_nop,
	vesa_mmap,
	vesa_diag,
};

static video_switch_t *prevvidsw;

/* VESA BIOS video modes */
#define VESA_MAXMODES	64
#define EOT		(-1)
#define NA		(-2)

static video_info_t vesa_vmode[VESA_MAXMODES + 1] = {
	{ EOT, },
};

static int vesa_init_done = FALSE;
static int has_vesa_bios = FALSE;
static struct vesa_info *vesa_adp_info = NULL;
static u_int16_t *vesa_vmodetab = NULL;
static char *vesa_oemstr = NULL;
static char *vesa_venderstr = NULL;
static char *vesa_prodstr = NULL;
static char *vesa_revstr = NULL;

/* local macros and functions */
#define BIOS_SADDRTOLADDR(p) ((((p) & 0xffff0000) >> 12) + ((p) & 0x0000ffff))

static int int10_set_mode(int mode);
static int vesa_bios_get_mode(int mode, struct vesa_mode *vmode);
static int vesa_bios_set_mode(int mode);
static int vesa_bios_get_dac(void);
static int vesa_bios_set_dac(int bits);
static int vesa_bios_save_palette(int start, int colors, u_char *palette,
				  int bits);
static int vesa_bios_load_palette(int start, int colors, u_char *palette,
				  int bits);
#define STATE_SIZE	0
#define STATE_SAVE	1
#define STATE_LOAD	2
#define STATE_HW	(1<<0)
#define STATE_DATA	(1<<1)
#define STATE_DAC	(1<<2)
#define STATE_REG	(1<<3)
#define STATE_MOST	(STATE_HW | STATE_DATA | STATE_REG)
#define STATE_ALL	(STATE_HW | STATE_DATA | STATE_DAC | STATE_REG)
static int vesa_bios_state_buf_size(void);
static int vesa_bios_save_restore(int code, void *p, size_t size);
static int vesa_bios_get_line_length(void);
static int vesa_map_gen_mode_num(int type, int color, int mode);
static int vesa_translate_flags(u_int16_t vflags);
static void *vesa_fix_ptr(u_int32_t p, u_int16_t seg, u_int16_t off, 
			  u_char *buf);
static int vesa_bios_init(void);
static void vesa_clear_modes(video_info_t *info, int color);

static void
dump_buffer(u_char *buf, size_t len)
{
    int i;

    for(i = 0; i < len;) {
	printf("%02x ", buf[i]);
	if ((++i % 16) == 0)
	    printf("\n");
    }
}

/* INT 10 BIOS calls */
static int
int10_set_mode(int mode)
{
	struct vm86frame vmf;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x0000 | mode;
	vm86_intcall(0x10, &vmf);
	return 0;
}

/* VESA BIOS calls */
static int
vesa_bios_get_mode(int mode, struct vesa_mode *vmode)
{
	struct vm86frame vmf;
	u_char *buf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f01; 
	vmf.vmf_ecx = mode;
	buf = (u_char *)vm86_getpage(&vesa_vmcontext, 1);
	vm86_getptr(&vesa_vmcontext, (vm_offset_t)buf, &vmf.vmf_es, &vmf.vmf_di);

	err = vm86_datacall(0x10, &vmf, &vesa_vmcontext);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 1;
	bcopy(buf, vmode, sizeof(*vmode));
	return 0;
}

static int
vesa_bios_set_mode(int mode)
{
	struct vm86frame vmf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f02;
	vmf.vmf_ebx = mode;
	err = vm86_intcall(0x10, &vmf);
	return ((err != 0) || (vmf.vmf_eax != 0x4f));
}

static int
vesa_bios_get_dac(void)
{
	struct vm86frame vmf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f08;
	vmf.vmf_ebx = 1;	/* get DAC width */
	err = vm86_intcall(0x10, &vmf);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 6;	/* XXX */
	return ((vmf.vmf_ebx >> 8) & 0x00ff);
}

static int
vesa_bios_set_dac(int bits)
{
	struct vm86frame vmf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f08;
	vmf.vmf_ebx = (bits << 8);
	err = vm86_intcall(0x10, &vmf);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 6;	/* XXX */
	return ((vmf.vmf_ebx >> 8) & 0x00ff);
}

static int
vesa_bios_save_palette(int start, int colors, u_char *palette, int bits)
{
	struct vm86frame vmf;
	u_char *p;
	int err;
	int i;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f09;
	vmf.vmf_ebx = 1;	/* get primary palette data */
	vmf.vmf_ecx = colors;
	vmf.vmf_edx = start;
	p = (u_char *)vm86_getpage(&vesa_vmcontext, 1);
	vm86_getptr(&vesa_vmcontext, (vm_offset_t)p, &vmf.vmf_es, &vmf.vmf_di);

	err = vm86_datacall(0x10, &vmf, &vesa_vmcontext);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 1;

	bits = 8 - bits;
	for (i = 0; i < colors; ++i) {
		palette[i*3]     = p[i*4 + 2] << bits;
		palette[i*3 + 1] = p[i*4 + 1] << bits;
		palette[i*3 + 2] = p[i*4] << bits;
	}
	return 0;
}

static int
vesa_bios_load_palette(int start, int colors, u_char *palette, int bits)
{
	struct vm86frame vmf;
	u_char *p;
	int err;
	int i;

	p = (u_char *)vm86_getpage(&vesa_vmcontext, 1);
	bits = 8 - bits;
	for (i = 0; i < colors; ++i) {
		p[i*4]	   = palette[i*3 + 2] >> bits;
		p[i*4 + 1] = palette[i*3 + 1] >> bits;
		p[i*4 + 2] = palette[i*3] >> bits;
		p[i*4 + 3] = 0;
	}

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f09;
	vmf.vmf_ebx = 0;	/* set primary palette data */
	vmf.vmf_ecx = colors;
	vmf.vmf_edx = start;
	vm86_getptr(&vesa_vmcontext, (vm_offset_t)p, &vmf.vmf_es, &vmf.vmf_di);

	err = vm86_datacall(0x10, &vmf, &vesa_vmcontext);
	return ((err != 0) || (vmf.vmf_eax != 0x4f));
}

static int
vesa_bios_state_buf_size(void)
{
	struct vm86frame vmf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f04; 
	vmf.vmf_ecx = STATE_MOST;
	vmf.vmf_edx = STATE_SIZE;
	err = vm86_intcall(0x10, &vmf);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 0;
	return vmf.vmf_ebx*64;
}

static int
vesa_bios_save_restore(int code, void *p, size_t size)
{
	struct vm86frame vmf;
	u_char *buf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f04; 
	vmf.vmf_ecx = STATE_MOST;
	vmf.vmf_edx = code;	/* STATE_SAVE/STATE_LOAD */
	buf = (u_char *)vm86_getpage(&vesa_vmcontext, 1);
	vm86_getptr(&vesa_vmcontext, (vm_offset_t)buf, &vmf.vmf_es, &vmf.vmf_di);
	bcopy(p, buf, size);

	err = vm86_datacall(0x10, &vmf, &vesa_vmcontext);
	return ((err != 0) || (vmf.vmf_eax != 0x4f));
}

static int
vesa_bios_get_line_length(void)
{
	struct vm86frame vmf;
	int err;

	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f06; 
	vmf.vmf_ebx = 1;	/* get scan line length */
	err = vm86_intcall(0x10, &vmf);
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return -1;
	return vmf.vmf_bx;	/* line length in bytes */
}

/* map a generic video mode to a known mode */
static int
vesa_map_gen_mode_num(int type, int color, int mode)
{
    static struct {
	int from;
	int to;
    } mode_map[] = {
	{ M_TEXT_132x25, M_VESA_C132x25 },
	{ M_TEXT_132x43, M_VESA_C132x43 },
	{ M_TEXT_132x50, M_VESA_C132x50 },
	{ M_TEXT_132x60, M_VESA_C132x60 },
    };
    int i;

    for (i = 0; i < sizeof(mode_map)/sizeof(mode_map[0]); ++i) {
        if (mode_map[i].from == mode)
            return mode_map[i].to;
    }
    return mode;
}

static int
vesa_translate_flags(u_int16_t vflags)
{
	static struct {
		u_int16_t mask;
		int set;
		int reset;
	} ftable[] = {
		{ V_MODECOLOR, V_INFO_COLOR, 0 },
		{ V_MODEGRAPHICS, V_INFO_GRAPHICS, 0 },
		{ V_MODELFB, V_INFO_LINEAR, 0 },
	};
	int flags;
	int i;

	for (flags = 0, i = 0; i < sizeof(ftable)/sizeof(ftable[0]); ++i) {
		flags |= (vflags & ftable[i].mask) ? 
			 ftable[i].set : ftable[i].reset;
	}
	return flags;
}

static void
*vesa_fix_ptr(u_int32_t p, u_int16_t seg, u_int16_t off, u_char *buf)
{
	if (p == 0)
		return NULL;
	if (((p >> 16) == seg) && ((p & 0xffff) >= off))
		return (void *)(buf + ((p & 0xffff) - off));
	else {
		p = BIOS_SADDRTOLADDR(p);
		return (void *)BIOS_PADDRTOVADDR(p);
	}
}

static int
vesa_bios_init(void)
{
	static u_char buf[512];
	struct vm86frame vmf;
	struct vesa_mode vmode;
	u_char *vmbuf;
	int modes;
	int err;
	int i;

	if (vesa_init_done)
		return 0;

	has_vesa_bios = FALSE;
	vesa_adp_info = NULL;
	vesa_vmode[0].vi_mode = EOT;

	vmbuf = (u_char *)vm86_addpage(&vesa_vmcontext, 1, 0);
	bzero(&vmf, sizeof(vmf));	/* paranoia */
	bcopy("VBE2", vmbuf, 4);	/* try for VBE2 data */
	vmf.vmf_eax = 0x4f00;
	vm86_getptr(&vesa_vmcontext, (vm_offset_t)vmbuf, &vmf.vmf_es, &vmf.vmf_di);

	err = vm86_datacall(0x10, &vmf, &vesa_vmcontext);
	if ((err != 0) || (vmf.vmf_eax != 0x4f) || bcmp("VESA", vmbuf, 4))
		return 1;
	bcopy(vmbuf, buf, sizeof(buf));
	vesa_adp_info = (struct vesa_info *)buf;
	if (bootverbose) {
		printf("VESA: information block\n");
		dump_buffer(buf, 64);
	}
	if (vesa_adp_info->v_flags & V_NONVGA)
		return 1;

	/* fix string ptrs */
	vesa_oemstr = (char *)vesa_fix_ptr(vesa_adp_info->v_oemstr,
					   vmf.vmf_es, vmf.vmf_di, buf);
	if (vesa_adp_info->v_version >= 0x0200) {
		vesa_venderstr = 
		    (char *)vesa_fix_ptr(vesa_adp_info->v_venderstr,
					 vmf.vmf_es, vmf.vmf_di, buf);
		vesa_prodstr = 
		    (char *)vesa_fix_ptr(vesa_adp_info->v_prodstr,
					 vmf.vmf_es, vmf.vmf_di, buf);
		vesa_revstr = 
		    (char *)vesa_fix_ptr(vesa_adp_info->v_revstr,
					 vmf.vmf_es, vmf.vmf_di, buf);
	}

	/* obtain video mode information */
	vesa_vmode[0].vi_mode = EOT;
	vesa_vmodetab = (u_int16_t *)vesa_fix_ptr(vesa_adp_info->v_modetable,
						  vmf.vmf_es, vmf.vmf_di, buf);
	if (vesa_vmodetab == NULL)
		return 1;
	for (i = 0, modes = 0; 
		(i < (M_VESA_MODE_MAX - M_VESA_BASE + 1))
		&& (vesa_vmodetab[i] != 0xffff); ++i) {
		if (modes >= VESA_MAXMODES)
			break;
		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode))
			continue;

		/* reject unsupported modes */
#if 0
		if ((vmode.v_modeattr & (V_MODESUPP | V_MODEOPTINFO 
					| V_MODENONVGA))
		    != (V_MODESUPP | V_MODEOPTINFO))
			continue;
#else
		if ((vmode.v_modeattr & (V_MODEOPTINFO | V_MODENONVGA))
		    != (V_MODEOPTINFO))
			continue;
#endif

		/* copy some fields */
		bzero(&vesa_vmode[modes], sizeof(vesa_vmode[modes]));
		vesa_vmode[modes].vi_mode = vesa_vmodetab[i];
		vesa_vmode[modes].vi_width = vmode.v_width;
		vesa_vmode[modes].vi_height = vmode.v_height;
		vesa_vmode[modes].vi_depth = vmode.v_bpp;
		vesa_vmode[modes].vi_planes = vmode.v_planes;
		vesa_vmode[modes].vi_cwidth = vmode.v_cwidth;
		vesa_vmode[modes].vi_cheight = vmode.v_cheight;
		vesa_vmode[modes].vi_window = (u_int)vmode.v_waseg << 4;
		/* XXX window B */
		vesa_vmode[modes].vi_window_size = vmode.v_wsize*1024;
		vesa_vmode[modes].vi_window_gran = vmode.v_wgran*1024;
		vesa_vmode[modes].vi_buffer = vmode.v_lfb;
		/* XXX */
		if (vmode.v_offscreen > vmode.v_lfb)
			vesa_vmode[modes].vi_buffer_size
				= vmode.v_offscreen - vmode.v_lfb;
		else
			vesa_vmode[modes].vi_buffer_size = vmode.v_offscreen;
		/* pixel format, memory model... */

		vesa_vmode[modes].vi_flags 
			= vesa_translate_flags(vmode.v_modeattr) | V_INFO_VESA;
		++modes;
	}
	vesa_vmode[modes].vi_mode = EOT;
	if (bootverbose)
		printf("VESA: %d mode(s) found\n", modes);

	has_vesa_bios = (modes > 0);
	return (has_vesa_bios ? 0 : 1);
}

static void
vesa_clear_modes(video_info_t *info, int color)
{
	while (info->vi_mode != EOT) {
		if ((info->vi_flags & V_INFO_COLOR) != color)
			info->vi_mode = NA;
		++info;
	}
}

/* entry points */

static int
vesa_configure(int flags)
{
	video_adapter_t *adp;
	int adapters;
	int error;
	int i;

	if (vesa_init_done)
		return 0;
	if (flags & VIO_PROBE_ONLY)
		return 0;		/* XXX */

	/*
	 * If the VESA module has already been loaded, abort loading 
	 * the module this time.
	 */
	for (i = 0; (adp = vid_get_adapter(i)) != NULL; ++i) {
		if (adp->va_flags & V_ADP_VESA)
			return ENXIO;
		if (adp->va_type == KD_VGA)
			break;
	}
	/*
	 * The VGA adapter is not found.  This is because either 
	 * 1) the VGA driver has not been initialized, or 2) the VGA card
	 * is not present.  If 1) is the case, we shall defer
	 * initialization for now and try again later.
	 */