1/* $NetBSD: pvh_consinit.c,v 1.6 2023/10/17 13:27:58 bouyer Exp $ */ 2 3/* 4 * Copyright (c) 2020 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: pvh_consinit.c,v 1.6 2023/10/17 13:27:58 bouyer Exp $"); 30 31#include "xencons.h" 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/device.h> 35#include <uvm/uvm_extern.h> 36#include <uvm/uvm_prot.h> 37 38#include <dev/cons.h> 39#include <xen/xen.h> 40#include <xen/hypervisor.h> 41#include <xen/include/public/hvm/hvm_op.h> 42#include <xen/include/public/hvm/params.h> 43 44#include "xen_def_cons.h" 45 46int 47xen_pvh_consinit(void) 48{ 49 /* 50 * hugly hack because we're called multiple times at different 51 * boot stage. 52 */ 53 static int initted = 0; 54 55 if (initted == 0) { 56 /* fall back to printk() until we can setup our console */ 57 xen_early_console(); 58 } 59 if (xendomain_is_dom0()) { 60 union xen_cmdline_parseinfo xcp; 61 xen_parse_cmdline(XEN_PARSE_CONSOLE, &xcp); 62#ifdef CONS_OVERRIDE 63 if (strcmp(default_consinfo.devname, "tty0") == 0 || 64 strcmp(default_consinfo.devname, "pc") == 0) { 65#else 66 if (strcmp(xcp.xcp_console, "tty0") == 0 || /* linux name */ 67 strcmp(xcp.xcp_console, "pc") == 0) { /* NetBSD name */ 68#endif /* CONS_OVERRIDE */ 69 initted++; 70 return 0; /* native console code will do it */ 71 } 72 } 73 if (initted == 0 && !xendomain_is_dom0()) { 74 /* pmap not up yet */ 75 initted++; 76 return 1; 77 } else if (initted > 1) { 78 return 1; 79 } 80 initted++; 81 if (xendomain_is_dom0()) { 82 /* we know we're using Xen's console at this point */ 83 xenconscn_attach(); /* no ring in this case */ 84 initted++; /* don't init console twice */ 85 return 1; 86 } 87 88#if NXENCONS > 0 89 /* we can now map the xencons rings. */ 90 struct xen_hvm_param xen_hvm_param; 91 92 93 xen_hvm_param.domid = DOMID_SELF; 94 xen_hvm_param.index = HVM_PARAM_CONSOLE_PFN; 95 96 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0) 97 panic("xen_pvh_consinit: can't get console PFN"); 98 99 xen_start_info.console.domU.mfn = xen_hvm_param.value; 100 pmap_kenter_pa((vaddr_t) xencons_interface, ptoa(xen_hvm_param.value), 101 VM_PROT_READ|VM_PROT_WRITE, 0); 102 103 xen_hvm_param.domid = DOMID_SELF; 104 xen_hvm_param.index = HVM_PARAM_CONSOLE_EVTCHN; 105 106 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0) 107 panic("xen_pvh_consinit: can't get console event"); 108 109 xen_start_info.console.domU.evtchn = xen_hvm_param.value; 110 xenconscn_attach(); 111#endif 112 return 1; 113} 114