vesa.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 1,166 行 · 第 1/2 页

	if (adp == NULL) {
		vga_sub_configure = vesa_configure;
		return ENODEV;
	}

	/* count number of registered adapters */
	for (++i; vid_get_adapter(i) != NULL; ++i)
		;
	adapters = i;

	/* call VESA BIOS */
	vesa_adp = adp;
	if (vesa_bios_init()) {
		vesa_adp = NULL;
		return ENXIO;
	}
	vesa_adp->va_flags |= V_ADP_VESA;

	/* remove conflicting modes if we have more than one adapter */
	if (adapters > 1) {
		vesa_clear_modes(vesa_vmode,
				 (vesa_adp->va_flags & V_ADP_COLOR) ? 
				     V_INFO_COLOR : 0);
	}

	if ((error = vesa_load_ioctl()) == 0) {
		prevvidsw = vidsw[vesa_adp->va_index];
		vidsw[vesa_adp->va_index] = &vesavidsw;
		vesa_init_done = TRUE;
	} else {
		vesa_adp = NULL;
		return error;
	}

	return 0;
}

static int
vesa_nop(void)
{
	return 0;
}

static int
vesa_probe(int unit, video_adapter_t **adpp, void *arg, int flags)
{
	return (*prevvidsw->probe)(unit, adpp, arg, flags);
}

static int
vesa_init(int unit, video_adapter_t *adp, int flags)
{
	return (*prevvidsw->init)(unit, adp, flags);
}

static int
vesa_get_info(video_adapter_t *adp, int mode, video_info_t *info)
{
	int i;

	if ((*prevvidsw->get_info)(adp, mode, info) == 0)
		return 0;

	if (adp != vesa_adp)
		return 1;

	mode = vesa_map_gen_mode_num(vesa_adp->va_type, 
				     vesa_adp->va_flags & V_ADP_COLOR, mode);
	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
		if (vesa_vmode[i].vi_mode == NA)
			continue;
		if (vesa_vmode[i].vi_mode == mode) {
			*info = vesa_vmode[i];
			return 0;
		}
	}
	return 1;
}

static int
vesa_query_mode(video_adapter_t *adp, video_info_t *info)
{
	int i;

	if ((i = (*prevvidsw->query_mode)(adp, info)) != -1)
		return i;
	if (adp != vesa_adp)
		return -1;

	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
		if ((info->vi_width != 0)
		    && (info->vi_width != vesa_vmode[i].vi_width))
			continue;
		if ((info->vi_height != 0)
		    && (info->vi_height != vesa_vmode[i].vi_height))
			continue;
		if ((info->vi_cwidth != 0)
		    && (info->vi_cwidth != vesa_vmode[i].vi_cwidth))
			continue;
		if ((info->vi_cheight != 0)
		    && (info->vi_cheight != vesa_vmode[i].vi_cheight))
			continue;
		if ((info->vi_depth != 0)
		    && (info->vi_depth != vesa_vmode[i].vi_depth))
			continue;
		if ((info->vi_planes != 0)
		    && (info->vi_planes != vesa_vmode[i].vi_planes))
			continue;
		/* pixel format, memory model */
		if ((info->vi_flags != 0)
		    && (info->vi_flags != vesa_vmode[i].vi_flags))
			continue;
		return vesa_vmode[i].vi_mode;
	}
	return -1;
}

static int
vesa_set_mode(video_adapter_t *adp, int mode)
{
	video_info_t info;
	size_t len;

	if (adp != vesa_adp)
		return (*prevvidsw->set_mode)(adp, mode);

	mode = vesa_map_gen_mode_num(vesa_adp->va_type, 
				     vesa_adp->va_flags & V_ADP_COLOR, mode);
#if VESA_DEBUG > 0
	printf("VESA: set_mode(): %d(%x) -> %d(%x)\n",
		vesa_adp->va_mode, vesa_adp->va_mode, mode, mode);
#endif
	/* 
	 * If the current mode is a VESA mode and the new mode is not,
	 * restore the state of the adapter first, so that non-standard, 
	 * extended SVGA registers are set to the state compatible with
	 * the standard VGA modes. Otherwise (*prevvidsw->set_mode)() 
	 * may not be able to set up the new mode correctly.
	 */
	if (VESA_MODE(vesa_adp->va_mode)) {
		if ((*prevvidsw->get_info)(adp, mode, &info) == 0) {
			int10_set_mode(vesa_adp->va_initial_bios_mode);
#if 0
			/* assert(vesa_state_buf != NULL); */
		    	if ((vesa_state_buf == NULL)
			    || vesa_load_state(adp, vesa_state_buf))
				return 1;
			free(vesa_state_buf, M_DEVBUF);
			vesa_state_buf = NULL;
#if VESA_DEBUG > 0
			printf("VESA: restored\n");
#endif
#endif /* 0 */
		}
		/* 
		 * once (*prevvidsw->get_info)() succeeded, 
		 * (*prevvidsw->set_mode)() below won't fail...
		 */
	}

	/* we may not need to handle this mode after all... */
	if ((*prevvidsw->set_mode)(adp, mode) == 0)
		return 0;

	/* is the new mode supported? */
	if (vesa_get_info(adp, mode, &info))
		return 1;
	/* assert(VESA_MODE(mode)); */

#if VESA_DEBUG > 0
	printf("VESA: about to set a VESA mode...\n");
#endif
	/* 
	 * If the current mode is not a VESA mode, save the current state
	 * so that the adapter state can be restored later when a non-VESA
	 * mode is to be set up. See above.
	 */
#if 0
	if (!VESA_MODE(vesa_adp->va_mode) && (vesa_state_buf == NULL)) {
		len = vesa_save_state(adp, NULL, 0);
		vesa_state_buf = malloc(len, M_DEVBUF, M_WAITOK);
		if (vesa_save_state(adp, vesa_state_buf, len)) {
#if VESA_DEBUG > 0
			printf("VESA: state save failed! (len=%d)\n", len);
#endif
			free(vesa_state_buf, M_DEVBUF);
			vesa_state_buf = NULL;
			return 1;
		}
#if VESA_DEBUG > 0
		printf("VESA: saved (len=%d)\n", len);
		dump_buffer(vesa_state_buf, len);
#endif
	}
#endif /* 0 */

	if (vesa_bios_set_mode(mode))
		return 1;

#if VESA_DEBUG > 0
	printf("VESA: mode set!\n");
#endif
	vesa_adp->va_mode = mode;
	vesa_adp->va_flags &= ~V_ADP_COLOR;
	vesa_adp->va_flags |= 
		(info.vi_flags & V_INFO_COLOR) ? V_ADP_COLOR : 0;
	vesa_adp->va_crtc_addr =
		(vesa_adp->va_flags & V_ADP_COLOR) ? COLOR_CRTC : MONO_CRTC;
	vesa_adp->va_window = BIOS_PADDRTOVADDR(info.vi_window);
	vesa_adp->va_window_size = info.vi_window_size;
	vesa_adp->va_window_gran = info.vi_window_gran;
	if (info.vi_buffer_size == 0) {
		vesa_adp->va_buffer = 0;
		vesa_adp->va_buffer_size = 0;
	} else {
		vesa_adp->va_buffer = BIOS_PADDRTOVADDR(info.vi_buffer);
		vesa_adp->va_buffer_size = info.vi_buffer_size;
	}
	len = vesa_bios_get_line_length();
	if (len > 0) {
		vesa_adp->va_line_width = len;
	} else if (info.vi_flags & V_INFO_GRAPHICS) {
		switch (info.vi_depth/info.vi_planes) {
		case 1:
			vesa_adp->va_line_width = info.vi_width/8;
			break;
		case 2:
			vesa_adp->va_line_width = info.vi_width/4;
			break;
		case 4:
			vesa_adp->va_line_width = info.vi_width/2;
			break;
		case 8:
		default: /* shouldn't happen */
			vesa_adp->va_line_width = info.vi_width;
			break;
		}
	} else {
		vesa_adp->va_line_width = info.vi_width;
	}
#if VESA_DEBUG > 0
	printf("vesa_set_mode(): vi_width:%d, len:%d, line_width:%d\n",
	       info.vi_width, len, vesa_adp->va_line_width);
#endif
	bcopy(&info, &vesa_adp->va_info, sizeof(vesa_adp->va_info));

	/* move hardware cursor out of the way */
	(*vidsw[vesa_adp->va_index]->set_hw_cursor)(vesa_adp, -1, -1);

	return 0;
}

static int
vesa_save_font(video_adapter_t *adp, int page, int fontsize, u_char *data,
	       int ch, int count)
{
	return (*prevvidsw->save_font)(adp, page, fontsize, data, ch, count);
}

static int
vesa_load_font(video_adapter_t *adp, int page, int fontsize, u_char *data,
	       int ch, int count)
{
	return (*prevvidsw->load_font)(adp, page, fontsize, data, ch, count);
}

static int
vesa_show_font(video_adapter_t *adp, int page)
{
	return (*prevvidsw->show_font)(adp, page);
}

static int
vesa_save_palette(video_adapter_t *adp, u_char *palette)
{
	int bits;
	int error;

	if ((adp == vesa_adp) && (vesa_adp_info->v_flags & V_DAC8)
	    && VESA_MODE(adp->va_mode)) {
		bits = vesa_bios_get_dac();
		error = vesa_bios_save_palette(0, 256, palette, bits);
		if (error == 0)
			return 0;
		if (bits != 6)
			return error;
	}

	return (*prevvidsw->save_palette)(adp, palette);
}

static int
vesa_load_palette(video_adapter_t *adp, u_char *palette)
{
#if notyet
	int bits;
	int error;

	if ((adp == vesa_adp) && (vesa_adp_info->v_flags & V_DAC8) 
	    && VESA_MODE(adp->va_mode) && ((bits = vesa_bios_set_dac(8)) > 6)) {
		error = vesa_bios_load_palette(0, 256, palette, bits);
		if (error == 0)
			return 0;
		if (vesa_bios_set_dac(6) != 6)
			return 1;
	}
#endif /* notyet */

	return (*prevvidsw->load_palette)(adp, palette);
}

static int
vesa_set_border(video_adapter_t *adp, int color)
{
	return (*prevvidsw->set_border)(adp, color);
}

static int
vesa_save_state(video_adapter_t *adp, void *p, size_t size)
{
	if (adp != vesa_adp)
		return (*prevvidsw->save_state)(adp, p, size);

	if (vesa_state_buf_size == 0)
		vesa_state_buf_size = vesa_bios_state_buf_size();
	if (size == 0)
		return (sizeof(int) + vesa_state_buf_size);
	else if (size < (sizeof(int) + vesa_state_buf_size))
		return 1;

	((adp_state_t *)p)->sig = V_STATE_SIG;
	bzero(((adp_state_t *)p)->regs, vesa_state_buf_size);
	return vesa_bios_save_restore(STATE_SAVE, ((adp_state_t *)p)->regs, 
				      vesa_state_buf_size);
}

static int
vesa_load_state(video_adapter_t *adp, void *p)
{
	if ((adp != vesa_adp) || (((adp_state_t *)p)->sig != V_STATE_SIG))
		return (*prevvidsw->load_state)(adp, p);

	return vesa_bios_save_restore(STATE_LOAD, ((adp_state_t *)p)->regs, 
				      vesa_state_buf_size);
}

static int
vesa_set_origin(video_adapter_t *adp, off_t offset)
{
	struct vm86frame vmf;
	int err;

	/*
	 * This function should return as quickly as possible to 
	 * maintain good performance of the system. For this reason,
	 * error checking is kept minimal and let the VESA BIOS to 
	 * detect error.
	 */
	if (adp != vesa_adp) 
		return (*prevvidsw->set_win_org)(adp, offset);

	if (vesa_adp->va_window_gran == 0)
		return 1;
	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f05; 
	vmf.vmf_ebx = 0;		/* WINDOW_A, XXX */
	vmf.vmf_edx = offset/vesa_adp->va_window_gran;
	err = vm86_intcall(0x10, &vmf); 
	if ((err != 0) || (vmf.vmf_eax != 0x4f))
		return 1;
	bzero(&vmf, sizeof(vmf));
	vmf.vmf_eax = 0x4f05; 
	vmf.vmf_ebx = 1;		/* WINDOW_B, XXX */
	vmf.vmf_edx = offset/vesa_adp->va_window_gran;
	err = vm86_intcall(0x10, &vmf); 
	return 0;			/* XXX */
}

static int
vesa_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
{
	return (*prevvidsw->read_hw_cursor)(adp, col, row);
}

static int
vesa_set_hw_cursor(video_adapter_t *adp, int col, int row)
{
	return (*prevvidsw->set_hw_cursor)(adp, col, row);
}

static int
vesa_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
			 int celsize, int blink)
{
	return (*prevvidsw->set_hw_cursor_shape)(adp, base, height, celsize,
						 blink);
}

static int
vesa_mmap(video_adapter_t *adp, vm_offset_t offset)
{
	return (*prevvidsw->mmap)(adp, offset);
}

static int
vesa_diag(video_adapter_t *adp, int level)
{
#if VESA_DEBUG > 1
	struct vesa_mode vmode;
	int i;
#endif

	if (adp != vesa_adp)
		return 1;

#ifndef KLD_MODULE
	/* call the previous handler first */
	(*prevvidsw->diag)(adp, level);
#endif

	/* general adapter information */
	printf("VESA: v%d.%d, %dk memory, flags:0x%x, mode table:%p (%x)\n", 
	       ((vesa_adp_info->v_version & 0xf000) >> 12) * 10 
		   + ((vesa_adp_info->v_version & 0x0f00) >> 8),
	       ((vesa_adp_info->v_version & 0x00f0) >> 4) * 10 
		   + (vesa_adp_info->v_version & 0x000f),
	       vesa_adp_info->v_memsize * 64, vesa_adp_info->v_flags,
	       vesa_vmodetab, vesa_adp_info->v_modetable);
	/* OEM string */
	if (vesa_oemstr != NULL)
		printf("VESA: %s\n", vesa_oemstr);

	if (level <= 0)
		return 0;

	if (vesa_adp_info->v_version >= 0x0200) {
		/* vendor name */
		if (vesa_venderstr != NULL)
			printf("VESA: %s\n", vesa_venderstr);
		/* product name */
		if (vesa_prodstr != NULL)
			printf("VESA: %s\n", vesa_prodstr);
		/* product revision */
		if (vesa_revstr != NULL)
			printf("VESA: %s\n", vesa_revstr);
	}

#if VESA_DEBUG > 1
	/* mode information */
	for (i = 0;
		(i < (M_VESA_MODE_MAX - M_VESA_BASE + 1))
		&& (vesa_vmodetab[i] != 0xffff); ++i) {
		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode))
			continue;

		/* print something for diagnostic purpose */
		printf("VESA: mode:0x%03x, flags:0x%04x", 
		       vesa_vmodetab[i], vmode.v_modeattr);
		if (vmode.v_modeattr & V_MODEOPTINFO) {
			if (vmode.v_modeattr & V_MODEGRAPHICS) {
				printf(", G %dx%dx%d %d, ", 
				       vmode.v_width, vmode.v_height,
				       vmode.v_bpp, vmode.v_planes);
			} else {
				printf(", T %dx%d, ", 
				       vmode.v_width, vmode.v_height);
			}
			printf("font:%dx%d", 
			       vmode.v_cwidth, vmode.v_cheight);
		}
		if (vmode.v_modeattr & V_MODELFB) {
			printf(", mem:%d, LFB:0x%x, off:0x%x", 
			       vmode.v_memmodel, vmode.v_lfb, 
			       vmode.v_offscreen);
		}
		printf("\n");
		printf("VESA: window A:0x%x (%x), window B:0x%x (%x), ",
		       vmode.v_waseg, vmode.v_waattr,
		       vmode.v_wbseg, vmode.v_wbattr);
		printf("size:%dk, gran:%dk\n",
		       vmode.v_wsize, vmode.v_wgran);
	}
#endif

	return 0;
}

/* module loading */

static int
vesa_load(void)
{
	int error;
	int s;

	if (vesa_init_done)
		return 0;

	/* locate a VGA adapter */
	s = spltty();
	vesa_adp = NULL;
	error = vesa_configure(0);
	splx(s);

#ifdef KLD_MODULE
	if (error == 0)
		vesa_diag(vesa_adp, bootverbose);
#endif

	return error;
}

#ifdef KLD_MODULE

static int
vesa_unload(void)
{
	u_char palette[256*3];
	int error;
	int bits;
	int s;

	/* if the adapter is currently in a VESA mode, don't unload */
	if ((vesa_adp != NULL) && VESA_MODE(vesa_adp->va_mode))
		return EBUSY;
	/* 
	 * FIXME: if there is at least one vty which is in a VESA mode,
	 * we shouldn't be unloading! XXX
	 */

	s = spltty();
	if ((error = vesa_unload_ioctl()) == 0) {
		if (vesa_adp != NULL) {
			if (vesa_adp_info->v_flags & V_DAC8)  {
				bits = vesa_bios_get_dac();
				if (bits > 6) {
					vesa_bios_save_palette(0, 256,
							       palette, bits);
					vesa_bios_set_dac(6);
					vesa_bios_load_palette(0, 256,
							       palette, 6);
				}
			}
			vesa_adp->va_flags &= ~V_ADP_VESA;
			vidsw[vesa_adp->va_index] = prevvidsw;
		}
	}
	splx(s);

	return error;
}

static int
vesa_mod_event(module_t mod, int type, void *data)
{
	switch (type) {
	case MOD_LOAD:
		return vesa_load();
	case MOD_UNLOAD:
		return vesa_unload();
	default:
		break;
	}
	return 0;
}

static moduledata_t vesa_mod = {
	"vesa",
	vesa_mod_event,
	NULL,
};

DECLARE_MODULE(vesa, vesa_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);

#else /* KLD_MODULE */

SYSINIT(vesa, SI_SUB_DRIVERS, SI_ORDER_MIDDLE,
	(void (*)(void *))vesa_load, NULL);

#endif /* KLD_MODULE */

#endif /* (NVGA > 0 && VESA && VM86) || KLD_MODULE */