1 /* $NetBSD: xenfunc.c,v 1.29 2022/08/20 23:48:51 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Christian Limpach. 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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: xenfunc.c,v 1.29 2022/08/20 23:48:51 riastradh Exp $"); 30 31 #include <sys/param.h> 32 33 #include <uvm/uvm_extern.h> 34 35 #include <machine/intr.h> 36 #include <machine/vmparam.h> 37 #include <machine/pmap.h> 38 #include <machine/pmap_private.h> 39 #include <xen/xen.h> 40 #include <xen/hypervisor.h> 41 //#include <xen/evtchn.h> 42 #include <xen/xenpmap.h> 43 #include <machine/pte.h> 44 45 #define MAX_XEN_IDT 128 46 47 void xen_set_ldt(vaddr_t, uint32_t); 48 49 void 50 invlpg(vaddr_t addr) 51 { 52 int s = splvm(); /* XXXSMP */ 53 xpq_queue_invlpg(addr); 54 splx(s); 55 } 56 57 void 58 lidt(struct region_descriptor *rd) 59 { 60 /* 61 * We need to do this because we can't assume kmem_alloc(9) 62 * will be available at the boot stage when this is called. 63 */ 64 static char xen_idt_page[PAGE_SIZE] __attribute__((__aligned__ (PAGE_SIZE))); 65 #if defined(__x86_64__) 66 kpreempt_disable(); 67 #endif 68 memset(xen_idt_page, 0, PAGE_SIZE); 69 70 struct trap_info *xen_idt = (void * )xen_idt_page; 71 int xen_idt_idx = 0; 72 73 struct trap_info * idd = (void *) rd->rd_base; 74 const int nidt = rd->rd_limit / (sizeof *idd); 75 76 int i; 77 78 /* 79 * Sweep in all initialised entries, consolidate them back to 80 * back in the requestor array. 81 */ 82 for (i = 0; i < nidt; i++) { 83 if (idd[i].address == 0) /* Skip gap */ 84 continue; 85 KASSERT(xen_idt_idx < MAX_XEN_IDT); 86 /* Copy over entry */ 87 xen_idt[xen_idt_idx++] = idd[i]; 88 } 89 90 #if defined(__x86_64__) 91 /* page needs to be r/o */ 92 pmap_changeprot_local((vaddr_t) xen_idt, VM_PROT_READ); 93 #endif /* __x86_64 */ 94 95 /* Hook it up in the hypervisor */ 96 if (HYPERVISOR_set_trap_table(xen_idt)) 97 panic("HYPERVISOR_set_trap_table() failed"); 98 99 #if defined(__x86_64__) 100 /* reset */ 101 pmap_changeprot_local((vaddr_t) xen_idt, VM_PROT_READ|VM_PROT_WRITE); 102 kpreempt_enable(); 103 #endif /* __x86_64 */ 104 } 105 106 void 107 lldt(u_short sel) 108 { 109 #ifndef __x86_64__ 110 struct cpu_info *ci; 111 112 ci = curcpu(); 113 114 if (ci->ci_curldt == sel) 115 return; 116 if (sel == GSEL(GLDT_SEL, SEL_KPL)) 117 xen_set_ldt((vaddr_t)ldtstore, NLDT); 118 else 119 xen_set_ldt(ci->ci_gdt[IDXSELN(sel)].ld.ld_base, 120 ci->ci_gdt[IDXSELN(sel)].ld.ld_entries); 121 ci->ci_curldt = sel; 122 #endif 123 } 124 125 void 126 ltr(u_short sel) 127 { 128 panic("XXX ltr not supported\n"); 129 } 130 131 void 132 lcr0(register_t val) 133 { 134 panic("XXX lcr0 not supported\n"); 135 } 136 137 register_t 138 rcr0(void) 139 { 140 /* XXX: handle X86_CR0_TS ? */ 141 return 0; 142 } 143 144 #ifndef __x86_64__ 145 void 146 lcr3(register_t val) 147 { 148 int s = splvm(); 149 xpq_queue_pt_switch(xpmap_ptom_masked(val)); 150 splx(s); 151 } 152 #endif 153 154 void 155 tlbflush(void) 156 { 157 int s = splvm(); 158 xpq_queue_tlb_flush(); 159 splx(s); 160 } 161 162 void 163 tlbflushg(void) 164 { 165 tlbflush(); 166 } 167 168 register_t 169 rdr0(void) 170 { 171 172 return HYPERVISOR_get_debugreg(0); 173 } 174 175 void 176 ldr0(register_t val) 177 { 178 179 HYPERVISOR_set_debugreg(0, val); 180 } 181 182 register_t 183 rdr1(void) 184 { 185 186 return HYPERVISOR_get_debugreg(1); 187 } 188 189 void 190 ldr1(register_t val) 191 { 192 193 HYPERVISOR_set_debugreg(1, val); 194 } 195 196 register_t 197 rdr2(void) 198 { 199 200 return HYPERVISOR_get_debugreg(2); 201 } 202 203 void 204 ldr2(register_t val) 205 { 206 207 HYPERVISOR_set_debugreg(2, val); 208 } 209 210 register_t 211 rdr3(void) 212 { 213 214 return HYPERVISOR_get_debugreg(3); 215 } 216 217 void 218 ldr3(register_t val) 219 { 220 221 HYPERVISOR_set_debugreg(3, val); 222 } 223 register_t 224 rdr6(void) 225 { 226 227 return HYPERVISOR_get_debugreg(6); 228 } 229 230 void 231 ldr6(register_t val) 232 { 233 234 HYPERVISOR_set_debugreg(6, val); 235 } 236 237 register_t 238 rdr7(void) 239 { 240 241 return HYPERVISOR_get_debugreg(7); 242 } 243 244 void 245 ldr7(register_t val) 246 { 247 248 HYPERVISOR_set_debugreg(7, val); 249 } 250 251 void 252 wbinvd(void) 253 { 254 255 xpq_flush_cache(); 256 } 257 258 register_t 259 rcr2(void) 260 { 261 return curcpu()->ci_vcpu->arch.cr2; 262 } 263 264 void 265 lcr2(register_t v) 266 { 267 curcpu()->ci_vcpu->arch.cr2 = v; 268 } 269 270 #ifdef __x86_64__ 271 void 272 setusergs(int gssel) 273 { 274 HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, gssel); 275 } 276 #endif 277
Indexes created Sat Sep 20 22:09:52 GMT 2025