xen.h revision 1.30.8.5
1 /* $NetBSD: xen.h,v 1.30.8.5 2011/05/02 22:49:58 jym 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[16]; /* sizeof(dv_xname) */ 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_sleepstate_setup(void); 77 78 #if defined(XENDEBUG) || 1 /* XXX */ 79 void printk(const char *, ...); 80 void vprintk(const char *, _BSD_VA_LIST_); 81 #endif 82 83 #endif 84 85 #endif /* _XEN_H */ 86 87 /****************************************************************************** 88 * os.h 89 * 90 * random collection of macros and definition 91 */ 92 93 #ifndef _OS_H_ 94 #define _OS_H_ 95 96 /* 97 * These are the segment descriptors provided for us by the hypervisor. 98 * For now, these are hardwired -- guest OSes cannot update the GDT 99 * or LDT. 100 * 101 * It shouldn't be hard to support descriptor-table frobbing -- let me 102 * know if the BSD or XP ports require flexibility here. 103 */ 104 105 106 /* 107 * these are also defined in xen-public/xen.h but can't be pulled in as 108 * they are used in start of day assembly. Need to clean up the .h files 109 * a bit more... 110 */ 111 112 #ifndef FLAT_RING1_CS 113 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 114 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 115 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 116 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 117 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 118 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 119 #endif 120 121 #define __KERNEL_CS FLAT_RING1_CS 122 #define __KERNEL_DS FLAT_RING1_DS 123 124 /* Everything below this point is not included by assembler (.S) files. */ 125 #ifndef _LOCORE 126 127 /* some function prototypes */ 128 void trap_init(void); 129 void xpq_flush_cache(void); 130 131 #define xendomain_is_dom0() (xen_start_info.flags & SIF_INITDOMAIN) 132 #define xendomain_is_privileged() (xen_start_info.flags & SIF_PRIVILEGED) 133 134 /* 135 * STI/CLI equivalents. These basically set and clear the virtual 136 * event_enable flag in the shared_info structure. Note that when 137 * the enable bit is set, there may be pending events to be handled. 138 * We may therefore call into do_hypervisor_callback() directly. 139 */ 140 141 #define __save_flags(x) \ 142 do { \ 143 (x) = curcpu()->ci_vcpu->evtchn_upcall_mask; \ 144 } while (0) 145 146 #define __restore_flags(x) \ 147 do { \ 148 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 149 __insn_barrier(); \ 150 if ((_vci->evtchn_upcall_mask = (x)) == 0) { \ 151 x86_lfence(); \ 152 if (__predict_false(_vci->evtchn_upcall_pending)) \ 153 hypervisor_force_callback(); \ 154 } \ 155 } while (0) 156 157 #define __cli() \ 158 do { \ 159 curcpu()->ci_vcpu->evtchn_upcall_mask = 1; \ 160 x86_lfence(); \ 161 } while (0) 162 163 #define __sti() \ 164 do { \ 165 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 166 __insn_barrier(); \ 167 _vci->evtchn_upcall_mask = 0; \ 168 x86_lfence(); /* unmask then check (avoid races) */ \ 169 if (__predict_false(_vci->evtchn_upcall_pending)) \ 170 hypervisor_force_callback(); \ 171 } while (0) 172 173 #define cli() __cli() 174 #define sti() __sti() 175 #define save_flags(x) __save_flags(x) 176 #define restore_flags(x) __restore_flags(x) 177 #define save_and_cli(x) do { \ 178 __save_flags(x); \ 179 __cli(); \ 180 } while (/* CONSTCOND */ 0) 181 #define save_and_sti(x) __save_and_sti(x) 182 183 /* 184 * always assume we're on multiprocessor. We don't know how many CPU the 185 * underlying hardware has. 186 */ 187 #define __LOCK_PREFIX "lock; " 188 189 #define XATOMIC_T u_long 190 #ifdef __x86_64__ 191 #define LONG_SHIFT 6 192 #define LONG_MASK 63 193 #else /* __x86_64__ */ 194 #define LONG_SHIFT 5 195 #define LONG_MASK 31 196 #endif /* __x86_64__ */ 197 198 #define xen_ffs __builtin_ffsl 199 200 static __inline XATOMIC_T 201 xen_atomic_xchg(volatile XATOMIC_T *ptr, unsigned long val) 202 { 203 unsigned long result; 204 205 __asm volatile(__LOCK_PREFIX 206 #ifdef __x86_64__ 207 "xchgq %0,%1" 208 #else 209 "xchgl %0,%1" 210 #endif 211 :"=r" (result) 212 :"m" (*ptr), "0" (val) 213 :"memory"); 214 215 return result; 216 } 217 218 static inline uint16_t 219 xen_atomic_cmpxchg16(volatile uint16_t *ptr, uint16_t val, uint16_t newval) 220 { 221 unsigned long result; 222 223 __asm volatile(__LOCK_PREFIX 224 "cmpxchgw %w1,%2" 225 :"=a" (result) 226 :"q"(newval), "m" (*ptr), "0" (val) 227 :"memory"); 228 229 return result; 230 } 231 232 static __inline void 233 xen_atomic_setbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 234 #ifdef __x86_64__ 235 __asm volatile("lock ; orq %1,%0" : "=m" (*ptr) : "ir" (bits)); 236 #else 237 __asm volatile("lock ; orl %1,%0" : "=m" (*ptr) : "ir" (bits)); 238 #endif 239 } 240 241 static __inline void 242 xen_atomic_clearbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 243 #ifdef __x86_64__ 244 __asm volatile("lock ; andq %1,%0" : "=m" (*ptr) : "ir" (~bits)); 245 #else 246 __asm volatile("lock ; andl %1,%0" : "=m" (*ptr) : "ir" (~bits)); 247 #endif 248 } 249 250 static __inline XATOMIC_T 251 xen_atomic_test_and_clear_bit(volatile void *ptr, unsigned long bitno) 252 { 253 int result; 254 255 __asm volatile(__LOCK_PREFIX 256 #ifdef __x86_64__ 257 "btrq %2,%1 ;" 258 "sbbq %0,%0" 259 #else 260 "btrl %2,%1 ;" 261 "sbbl %0,%0" 262 #endif 263 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 264 :"Ir" (bitno) : "memory"); 265 return result; 266 } 267 268 static __inline XATOMIC_T 269 xen_atomic_test_and_set_bit(volatile void *ptr, unsigned long bitno) 270 { 271 long result; 272 273 __asm volatile(__LOCK_PREFIX 274 #ifdef __x86_64__ 275 "btsq %2,%1 ;" 276 "sbbq %0,%0" 277 #else 278 "btsl %2,%1 ;" 279 "sbbl %0,%0" 280 #endif 281 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 282 :"Ir" (bitno) : "memory"); 283 return result; 284 } 285 286 static __inline int 287 xen_constant_test_bit(const volatile void *ptr, unsigned long bitno) 288 { 289 return ((1UL << (bitno & LONG_MASK)) & 290 (((const volatile XATOMIC_T *) ptr)[bitno >> LONG_SHIFT])) != 0; 291 } 292 293 static __inline XATOMIC_T 294 xen_variable_test_bit(const volatile void *ptr, unsigned long bitno) 295 { 296 long result; 297 298 __asm volatile( 299 #ifdef __x86_64__ 300 "btq %2,%1 ;" 301 "sbbq %0,%0" 302 #else 303 "btl %2,%1 ;" 304 "sbbl %0,%0" 305 #endif 306 :"=r" (result) 307 :"m" (*(const volatile XATOMIC_T *)(ptr)), "Ir" (bitno)); 308 return result; 309 } 310 311 #define xen_atomic_test_bit(ptr, bitno) \ 312 (__builtin_constant_p(bitno) ? \ 313 xen_constant_test_bit((ptr),(bitno)) : \ 314 xen_variable_test_bit((ptr),(bitno))) 315 316 static __inline void 317 xen_atomic_set_bit(volatile void *ptr, unsigned long bitno) 318 { 319 __asm volatile(__LOCK_PREFIX 320 #ifdef __x86_64__ 321 "btsq %1,%0" 322 #else 323 "btsl %1,%0" 324 #endif 325 :"=m" (*(volatile XATOMIC_T *)(ptr)) 326 :"Ir" (bitno)); 327 } 328 329 static __inline void 330 xen_atomic_clear_bit(volatile void *ptr, unsigned long bitno) 331 { 332 __asm volatile(__LOCK_PREFIX 333 #ifdef __x86_64__ 334 "btrq %1,%0" 335 #else 336 "btrl %1,%0" 337 #endif 338 :"=m" (*(volatile XATOMIC_T *)(ptr)) 339 :"Ir" (bitno)); 340 } 341 342 #undef XATOMIC_T 343 344 void wbinvd(void); 345 346 #endif /* !__ASSEMBLY__ */ 347 348 #endif /* _OS_H_ */ 349
Indexes created Tue Oct 14 15:09:51 GMT 2025