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/param.h> 30 #include <sys/types.h> 31 32 #include <machine/vmm.h> 33 #include <vmmapi.h> 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <assert.h> 38 39 #include "bhyverun.h" 40 #include "spinup_ap.h" 41 42 static void 43 spinup_ap_realmode(struct vcpu *newcpu, uint64_t rip) 44 { 45 int vector, error; 46 uint16_t cs; 47 uint64_t desc_base; 48 uint32_t desc_limit, desc_access; 49 50 vector = rip >> PAGE_SHIFT; 51 52 /* 53 * Update the %cs and %rip of the guest so that it starts 54 * executing real mode code at at 'vector << 12'. 55 */ 56 error = vm_set_register(newcpu, VM_REG_GUEST_RIP, 0); 57 assert(error == 0); 58 59 error = vm_get_desc(newcpu, VM_REG_GUEST_CS, &desc_base, 60 &desc_limit, &desc_access); 61 assert(error == 0); 62 63 desc_base = vector << PAGE_SHIFT; 64 error = vm_set_desc(newcpu, VM_REG_GUEST_CS, 65 desc_base, desc_limit, desc_access); 66 assert(error == 0); 67 68 cs = (vector << PAGE_SHIFT) >> 4; 69 error = vm_set_register(newcpu, VM_REG_GUEST_CS, cs); 70 assert(error == 0); 71 } 72 73 void 74 spinup_ap(struct vcpu *newcpu, uint64_t rip) 75 { 76 int error; 77 78 error = vcpu_reset(newcpu); 79 assert(error == 0); 80 81 spinup_ap_realmode(newcpu, rip); 82 83 vm_resume_cpu(newcpu); 84 } 85