1 /* $NetBSD: prekern.c,v 1.4 2018/08/12 12:42:53 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2017 The NetBSD Foundation, Inc. All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Maxime Villard. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 33 #include "opt_realmem.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/cpu.h> 39 #include <sys/conf.h> 40 41 #include <uvm/uvm.h> 42 #include <machine/pmap.h> 43 #include <machine/bootinfo.h> 44 #include <machine/cpufunc.h> 45 46 #include <dev/isa/isareg.h> 47 #include <machine/isa_machdep.h> 48 49 #define PREKERN_API_VERSION 2 50 51 struct prekern_args { 52 int version; 53 int boothowto; 54 void *bootinfo; 55 void *bootspace; 56 int esym; 57 int biosextmem; 58 int biosbasemem; 59 int cpuid_level; 60 uint32_t nox_flag; 61 uint64_t PDPpaddr; 62 vaddr_t atdevbase; 63 vaddr_t lwp0uarea; 64 paddr_t first_avail; 65 }; 66 67 void main(void); 68 void init_slotspace(void); 69 void init_x86_64(paddr_t); 70 71 static void prekern_copy_args(struct prekern_args *); 72 static void prekern_unmap(void); 73 int start_prekern(struct prekern_args *); 74 75 static void 76 prekern_copy_args(struct prekern_args *pkargs) 77 { 78 extern int boothowto; 79 extern struct bootinfo bootinfo; 80 extern struct bootspace bootspace; 81 extern int esym; 82 extern int biosextmem; 83 extern int biosbasemem; 84 extern int cpuid_level; 85 extern uint32_t nox_flag; 86 extern uint64_t PDPpaddr; 87 extern vaddr_t lwp0uarea; 88 89 boothowto = pkargs->boothowto; 90 memcpy(&bootinfo, pkargs->bootinfo, sizeof(bootinfo)); 91 memcpy(&bootspace, pkargs->bootspace, sizeof(bootspace)); 92 esym = pkargs->esym; 93 94 #ifndef REALEXTMEM 95 biosextmem = pkargs->biosextmem; 96 #else 97 biosextmem = REALEXTMEM; 98 #endif 99 100 #ifndef REALBASEMEM 101 biosbasemem = pkargs->biosbasemem; 102 #else 103 biosbasemem = REALBASEMEM; 104 #endif 105 106 cpuid_level = pkargs->cpuid_level; 107 nox_flag = pkargs->nox_flag; 108 PDPpaddr = pkargs->PDPpaddr; 109 atdevbase = pkargs->atdevbase; 110 lwp0uarea = pkargs->lwp0uarea; 111 } 112 113 static void 114 prekern_unmap(void) 115 { 116 L4_BASE[0] = 0; 117 tlbflushg(); 118 } 119 120 /* 121 * The prekern jumps here. 122 */ 123 int 124 start_prekern(struct prekern_args *pkargs) 125 { 126 paddr_t first_avail; 127 128 if (pkargs->version != PREKERN_API_VERSION) { 129 return -1; 130 } 131 132 prekern_copy_args(pkargs); 133 first_avail = pkargs->first_avail; 134 135 init_slotspace(); 136 init_x86_64(first_avail); 137 138 prekern_unmap(); 139 140 main(); 141 142 panic("main returned"); 143 144 return 0; 145 } 146