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