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      1 /*      $NetBSD: genfb_xen.c,v 1.2 2023/10/17 16:09:12 bouyer Exp $      */
      2 
      3 /*
      4  * Copyright (c) 2023 Manuel Bouyer.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  *
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: genfb_xen.c,v 1.2 2023/10/17 16:09:12 bouyer Exp $");
     30 
     31 
     32 #include <sys/device.h>
     33 #include <xen/include/xen.h>
     34 #include <xen/include/hypervisor.h>
     35 #include <xen/include/public/xen.h>
     36 #include <arch/x86/include/genfb_machdep.h>
     37 #include <arch/x86/include/bootinfo.h>
     38 
     39 static struct btinfo_framebuffer _xen_genfb_btinfo = {0};
     40 
     41 const struct btinfo_framebuffer *
     42 xen_genfb_getbtinfo(void)
     43 {
     44 	dom0_vga_console_info_t *d0_consi;
     45 	int info_size;
     46 
     47 	if (!xendomain_is_dom0())
     48 		return NULL;
     49 
     50 	if (_xen_genfb_btinfo.common.type == BTINFO_FRAMEBUFFER)
     51 		return &_xen_genfb_btinfo;
     52 
     53 #ifdef XENPVHVM
     54 	struct xen_platform_op op = {
     55 		.cmd = XENPF_get_dom0_console,
     56 	};
     57 	info_size = HYPERVISOR_platform_op(&op);
     58 	if (info_size < sizeof(dom0_vga_console_info_t)) {
     59 		printf("XENPF_get_dom0_console fail %d\n", info_size);
     60 		return NULL;
     61 	}
     62 	d0_consi = &op.u.dom0_console;
     63 #else
     64 	d0_consi = (void *)((char *)&xen_start_info +
     65 	    xen_start_info.console.dom0.info_off);
     66 	info_size = xen_start_info.console.dom0.info_size;
     67 #endif
     68 
     69 	if (d0_consi->video_type != XEN_VGATYPE_VESA_LFB &&
     70 	    d0_consi->video_type != XEN_VGATYPE_EFI_LFB)
     71 		return NULL;
     72 
     73 	_xen_genfb_btinfo.common.type = BTINFO_FRAMEBUFFER;
     74 	_xen_genfb_btinfo.common.len = sizeof(struct btinfo_framebuffer);
     75 	_xen_genfb_btinfo.physaddr = d0_consi->u.vesa_lfb.lfb_base;
     76 	if (info_size >=
     77 	    offsetof(dom0_vga_console_info_t, u.vesa_lfb.ext_lfb_base)) {
     78 		_xen_genfb_btinfo.physaddr |=
     79 		    (uint64_t)d0_consi->u.vesa_lfb.ext_lfb_base << 32;
     80 	}
     81 	_xen_genfb_btinfo.flags = 0;
     82 	_xen_genfb_btinfo.width = d0_consi->u.vesa_lfb.width;
     83 	_xen_genfb_btinfo.height = d0_consi->u.vesa_lfb.height;
     84 	_xen_genfb_btinfo.stride = d0_consi->u.vesa_lfb.bytes_per_line;
     85 	_xen_genfb_btinfo.depth = d0_consi->u.vesa_lfb.bits_per_pixel;
     86 	_xen_genfb_btinfo.rnum = d0_consi->u.vesa_lfb.red_pos;
     87 	_xen_genfb_btinfo.gnum = d0_consi->u.vesa_lfb.green_pos;
     88 	_xen_genfb_btinfo.bnum = d0_consi->u.vesa_lfb.blue_pos;
     89 	_xen_genfb_btinfo.rpos = d0_consi->u.vesa_lfb.red_size;
     90 	_xen_genfb_btinfo.gpos = d0_consi->u.vesa_lfb.green_size;
     91 	_xen_genfb_btinfo.bpos = d0_consi->u.vesa_lfb.blue_size;
     92 	_xen_genfb_btinfo.vbemode = 0; /* XXX */
     93 
     94 	return &_xen_genfb_btinfo;
     95 }
     96