xen.h revision 1.42
1 /* $NetBSD: xen.h,v 1.42 2019/02/02 12:32:55 cherry Exp $ */ 2 3 /* 4 * 5 * Copyright (c) 2003, 2004 Keir Fraser (on behalf of the Xen team) 6 * All rights reserved. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to 10 * deal in the Software without restriction, including without limitation the 11 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 12 * sell copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 24 * DEALINGS IN THE SOFTWARE. 25 */ 26 27 28 #ifndef _XEN_H 29 #define _XEN_H 30 31 #ifdef _KERNEL_OPT 32 #include "opt_xen.h" 33 #endif 34 35 36 #ifndef _LOCORE 37 38 #include <machine/cpufunc.h> 39 40 struct xen_netinfo { 41 uint32_t xi_ifno; 42 char *xi_root; 43 uint32_t xi_ip[5]; 44 }; 45 46 union xen_cmdline_parseinfo { 47 char xcp_bootdev[144]; 48 struct xen_netinfo xcp_netinfo; 49 char xcp_console[16]; 50 char xcp_pcidevs[64]; 51 }; 52 53 #define XEN_PARSE_BOOTDEV 0 54 #define XEN_PARSE_NETINFO 1 55 #define XEN_PARSE_CONSOLE 2 56 #define XEN_PARSE_BOOTFLAGS 3 57 #define XEN_PARSE_PCIBACK 4 58 59 void xen_parse_cmdline(int, union xen_cmdline_parseinfo *); 60 61 void xenconscn_attach(void); 62 63 void xenprivcmd_init(void); 64 65 void xbdback_init(void); 66 void xennetback_init(void); 67 void xen_shm_init(void); 68 69 void xenevt_event(int); 70 void xenevt_setipending(int, int); 71 void xenevt_notify(void); 72 73 void idle_block(void); 74 75 /* xen_machdep.c */ 76 void sysctl_xen_suspend_setup(void); 77 78 #include <sys/stdarg.h> 79 void printk(const char *, ...); 80 81 #endif 82 83 #endif /* _XEN_H */ 84 85 /****************************************************************************** 86 * os.h 87 * 88 * random collection of macros and definition 89 */ 90 91 #ifndef _OS_H_ 92 #define _OS_H_ 93 94 /* 95 * These are the segment descriptors provided for us by the hypervisor. 96 * For now, these are hardwired -- guest OSes cannot update the GDT 97 * or LDT. 98 * 99 * It shouldn't be hard to support descriptor-table frobbing -- let me 100 * know if the BSD or XP ports require flexibility here. 101 */ 102 103 104 /* 105 * these are also defined in xen-public/xen.h but can't be pulled in as 106 * they are used in start of day assembly. Need to clean up the .h files 107 * a bit more... 108 */ 109 110 #ifndef FLAT_RING1_CS 111 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 112 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 113 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 114 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 115 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 116 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 117 #endif 118 119 #define __KERNEL_CS FLAT_RING1_CS 120 #define __KERNEL_DS FLAT_RING1_DS 121 122 /* Everything below this point is not included by assembler (.S) files. */ 123 #ifndef _LOCORE 124 125 /* some function prototypes */ 126 void trap_init(void); 127 void xpq_flush_cache(void); 128 129 #define xendomain_is_dom0() (xen_start_info.flags & SIF_INITDOMAIN) 130 #define xendomain_is_privileged() (xen_start_info.flags & SIF_PRIVILEGED) 131 132 /* 133 * STI/CLI equivalents. These basically set and clear the virtual 134 * event_enable flag in the shared_info structure. Note that when 135 * the enable bit is set, there may be pending events to be handled. 136 * We may therefore call into do_hypervisor_callback() directly. 137 */ 138 139 #define __save_flags(x) \ 140 do { \ 141 (x) = curcpu()->ci_vcpu->evtchn_upcall_mask; \ 142 } while (0) 143 144 #define __restore_flags(x) \ 145 do { \ 146 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 147 __insn_barrier(); \ 148 if ((_vci->evtchn_upcall_mask = (x)) == 0) { \ 149 x86_lfence(); \ 150 if (__predict_false(_vci->evtchn_upcall_pending)) \ 151 hypervisor_force_callback(); \ 152 } \ 153 } while (0) 154 155 #define __cli() \ 156 do { \ 157 curcpu()->ci_vcpu->evtchn_upcall_mask = 1; \ 158 x86_lfence(); \ 159 } while (0) 160 161 #define __sti() \ 162 do { \ 163 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 164 __insn_barrier(); \ 165 _vci->evtchn_upcall_mask = 0; \ 166 x86_lfence(); /* unmask then check (avoid races) */ \ 167 if (__predict_false(_vci->evtchn_upcall_pending)) \ 168 hypervisor_force_callback(); \ 169 } while (0) 170 171 #define cli() __cli() 172 #define sti() __sti() 173 #define save_flags(x) __save_flags(x) 174 #define restore_flags(x) __restore_flags(x) 175 #define save_and_cli(x) do { \ 176 __save_flags(x); \ 177 __cli(); \ 178 } while (/* CONSTCOND */ 0) 179 #define save_and_sti(x) __save_and_sti(x) 180 181 /* 182 * always assume we're on multiprocessor. We don't know how many CPU the 183 * underlying hardware has. 184 */ 185 #define __LOCK_PREFIX "lock; " 186 187 #define XATOMIC_T u_long 188 #ifdef __x86_64__ 189 #define LONG_SHIFT 6 190 #define LONG_MASK 63 191 #else /* __x86_64__ */ 192 #define LONG_SHIFT 5 193 #define LONG_MASK 31 194 #endif /* __x86_64__ */ 195 196 #define xen_ffs __builtin_ffsl 197 198 static __inline XATOMIC_T 199 xen_atomic_xchg(volatile XATOMIC_T *ptr, unsigned long val) 200 { 201 unsigned long result; 202 203 __asm volatile(__LOCK_PREFIX 204 #ifdef __x86_64__ 205 "xchgq %0,%1" 206 #else 207 "xchgl %0,%1" 208 #endif 209 :"=r" (result) 210 :"m" (*ptr), "0" (val) 211 :"memory"); 212 213 return result; 214 } 215 216 static inline uint16_t 217 xen_atomic_cmpxchg16(volatile uint16_t *ptr, uint16_t val, uint16_t newval) 218 { 219 unsigned long result; 220 221 __asm volatile(__LOCK_PREFIX 222 "cmpxchgw %w1,%2" 223 :"=a" (result) 224 :"q"(newval), "m" (*ptr), "0" (val) 225 :"memory"); 226 227 return result; 228 } 229 230 static __inline void 231 xen_atomic_setbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 232 #ifdef __x86_64__ 233 __asm volatile("lock ; orq %1,%0" : "=m" (*ptr) : "ir" (bits)); 234 #else 235 __asm volatile("lock ; orl %1,%0" : "=m" (*ptr) : "ir" (bits)); 236 #endif 237 } 238 239 static __inline void 240 xen_atomic_clearbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 241 #ifdef __x86_64__ 242 __asm volatile("lock ; andq %1,%0" : "=m" (*ptr) : "ir" (~bits)); 243 #else 244 __asm volatile("lock ; andl %1,%0" : "=m" (*ptr) : "ir" (~bits)); 245 #endif 246 } 247 248 static __inline XATOMIC_T 249 xen_atomic_test_and_clear_bit(volatile void *ptr, unsigned long bitno) 250 { 251 long result; 252 253 __asm volatile(__LOCK_PREFIX 254 #ifdef __x86_64__ 255 "btrq %2,%1 ;" 256 "sbbq %0,%0" 257 #else 258 "btrl %2,%1 ;" 259 "sbbl %0,%0" 260 #endif 261 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 262 :"Ir" (bitno) : "memory"); 263 return result; 264 } 265 266 static __inline XATOMIC_T 267 xen_atomic_test_and_set_bit(volatile void *ptr, unsigned long bitno) 268 { 269 long result; 270 271 __asm volatile(__LOCK_PREFIX 272 #ifdef __x86_64__ 273 "btsq %2,%1 ;" 274 "sbbq %0,%0" 275 #else 276 "btsl %2,%1 ;" 277 "sbbl %0,%0" 278 #endif 279 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 280 :"Ir" (bitno) : "memory"); 281 return result; 282 } 283 284 static __inline int 285 xen_constant_test_bit(const volatile void *ptr, unsigned long bitno) 286 { 287 return ((1UL << (bitno & LONG_MASK)) & 288 (((const volatile XATOMIC_T *) ptr)[bitno >> LONG_SHIFT])) != 0; 289 } 290 291 static __inline XATOMIC_T 292 xen_variable_test_bit(const volatile void *ptr, unsigned long bitno) 293 { 294 long result; 295 296 __asm volatile( 297 #ifdef __x86_64__ 298 "btq %2,%1 ;" 299 "sbbq %0,%0" 300 #else 301 "btl %2,%1 ;" 302 "sbbl %0,%0" 303 #endif 304 :"=r" (result) 305 :"m" (*(const volatile XATOMIC_T *)(ptr)), "Ir" (bitno)); 306 return result; 307 } 308 309 #define xen_atomic_test_bit(ptr, bitno) \ 310 (__builtin_constant_p(bitno) ? \ 311 xen_constant_test_bit((ptr),(bitno)) : \ 312 xen_variable_test_bit((ptr),(bitno))) 313 314 static __inline void 315 xen_atomic_set_bit(volatile void *ptr, unsigned long bitno) 316 { 317 __asm volatile(__LOCK_PREFIX 318 #ifdef __x86_64__ 319 "btsq %1,%0" 320 #else 321 "btsl %1,%0" 322 #endif 323 :"=m" (*(volatile XATOMIC_T *)(ptr)) 324 :"Ir" (bitno)); 325 } 326 327 static __inline void 328 xen_atomic_clear_bit(volatile void *ptr, unsigned long bitno) 329 { 330 __asm volatile(__LOCK_PREFIX 331 #ifdef __x86_64__ 332 "btrq %1,%0" 333 #else 334 "btrl %1,%0" 335 #endif 336 :"=m" (*(volatile XATOMIC_T *)(ptr)) 337 :"Ir" (bitno)); 338 } 339 340 #undef XATOMIC_T 341 342 void wbinvd(void); 343 344 #include <xen/include/public/features.h> 345 #include <sys/systm.h> 346 347 extern bool xen_feature_tables[]; 348 void xen_init_features(void); 349 static __inline bool 350 xen_feature(int f) 351 { 352 KASSERT(f < XENFEAT_NR_SUBMAPS * 32); 353 return xen_feature_tables[f]; 354 } 355 356 #endif /* !__ASSEMBLY__ */ 357 358 #endif /* _OS_H_ */ 359
Indexes created Wed Sep 24 05:09:52 GMT 2025