1 /* $NetBSD: pvh_consinit.c,v 1.2 2020/05/03 17:23:14 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 1.2 2020/05/03 17:23:14 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 static int pvh_xenconscn_getc(dev_t); 45 static void pvh_xenconscn_putc(dev_t, int); 46 static void pvh_xenconscn_pollc(dev_t, int); 47 48 static struct consdev pvh_xencons = { 49 NULL, NULL, pvh_xenconscn_getc, pvh_xenconscn_putc, pvh_xenconscn_pollc, 50 NULL, NULL, NULL, NODEV, CN_NORMAL 51 }; 52 53 54 void 55 xen_pvh_consinit(void) 56 { 57 /* 58 * hugly hack because we're called multiple times at different 59 * boot stage. 60 */ 61 static int initted = 0; 62 if (initted == 0 && !xendomain_is_dom0()) { 63 /* pmap not up yet, fall back to printk() */ 64 cn_tab = &pvh_xencons; 65 initted++; 66 return; 67 } else if (initted > 1) { 68 return; 69 } 70 initted++; 71 if (xendomain_is_dom0()) { 72 xenconscn_attach(); /* no ring in this case */ 73 initted++; /* don't init console twice */ 74 return; 75 } 76 77 #if NXENCONS > 0 78 /* we can now map the xencons rings. */ 79 struct xen_hvm_param xen_hvm_param; 80 81 82 xen_hvm_param.domid = DOMID_SELF; 83 xen_hvm_param.index = HVM_PARAM_CONSOLE_PFN; 84 85 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0) 86 panic("xen_pvh_consinit: can't get console PFN"); 87 88 xen_start_info.console.domU.mfn = xen_hvm_param.value; 89 pmap_kenter_pa((vaddr_t) xencons_interface, ptoa(xen_hvm_param.value), 90 VM_PROT_READ|VM_PROT_WRITE, 0); 91 92 xen_hvm_param.domid = DOMID_SELF; 93 xen_hvm_param.index = HVM_PARAM_CONSOLE_EVTCHN; 94 95 if ( HYPERVISOR_hvm_op(HVMOP_get_param, &xen_hvm_param) < 0) 96 panic("xen_pvh_consinit: can't get console event"); 97 98 xen_start_info.console.domU.evtchn = xen_hvm_param.value; 99 xenconscn_attach(); 100 #endif 101 } 102 103 static int 104 pvh_xenconscn_getc(dev_t dev) 105 { 106 while(1) 107 ; 108 return -1; 109 } 110 111 static void 112 pvh_xenconscn_putc(dev_t dev, int c) 113 { 114 printk("%c", c); 115 } 116 117 static void 118 pvh_xenconscn_pollc(dev_t dev, int on) 119 { 120 return; 121 } 122