1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2012 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/types.h> 32 33 #include <machine/vmm.h> 34 #include <vmmapi.h> 35 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <assert.h> 39 40 #include "bhyverun.h" 41 #include "spinup_ap.h" 42 43 static void 44 spinup_ap_realmode(struct vcpu *newcpu, uint64_t rip) 45 { 46 int vector, error; 47 uint16_t cs; 48 uint64_t desc_base; 49 uint32_t desc_limit, desc_access; 50 51 vector = rip >> PAGE_SHIFT; 52 53 /* 54 * Update the %cs and %rip of the guest so that it starts 55 * executing real mode code at at 'vector << 12'. 56 */ 57 error = vm_set_register(newcpu, VM_REG_GUEST_RIP, 0); 58 assert(error == 0); 59 60 error = vm_get_desc(newcpu, VM_REG_GUEST_CS, &desc_base, 61 &desc_limit, &desc_access); 62 assert(error == 0); 63 64 desc_base = vector << PAGE_SHIFT; 65 error = vm_set_desc(newcpu, VM_REG_GUEST_CS, 66 desc_base, desc_limit, desc_access); 67 assert(error == 0); 68 69 cs = (vector << PAGE_SHIFT) >> 4; 70 error = vm_set_register(newcpu, VM_REG_GUEST_CS, cs); 71 assert(error == 0); 72 } 73 74 void 75 spinup_ap(struct vcpu *newcpu, uint64_t rip) 76 { 77 int error; 78 79 error = vcpu_reset(newcpu); 80 assert(error == 0); 81 82 spinup_ap_realmode(newcpu, rip); 83 84 vm_resume_cpu(newcpu); 85 } 86