1 /* $NetBSD: xen.h,v 1.32 2009/07/29 12:02:06 cegger 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 #include "opt_xen.h" 31 32 33 #ifndef _LOCORE 34 35 #include <machine/cpufunc.h> 36 37 struct xen_netinfo { 38 uint32_t xi_ifno; 39 char *xi_root; 40 uint32_t xi_ip[5]; 41 }; 42 43 union xen_cmdline_parseinfo { 44 char xcp_bootdev[16]; /* sizeof(dv_xname) */ 45 struct xen_netinfo xcp_netinfo; 46 char xcp_console[16]; 47 char xcp_pcidevs[64]; 48 }; 49 50 #define XEN_PARSE_BOOTDEV 0 51 #define XEN_PARSE_NETINFO 1 52 #define XEN_PARSE_CONSOLE 2 53 #define XEN_PARSE_BOOTFLAGS 3 54 #define XEN_PARSE_PCIBACK 4 55 56 void xen_parse_cmdline(int, union xen_cmdline_parseinfo *); 57 58 void xenconscn_attach(void); 59 60 void xenprivcmd_init(void); 61 62 void xbdback_init(void); 63 void xennetback_init(void); 64 void xen_shm_init(void); 65 66 void xenevt_event(int); 67 void xenevt_setipending(int, int); 68 void xenevt_notify(void); 69 70 void idle_block(void); 71 72 #if defined(XENDEBUG) || 1 /* XXX */ 73 void printk(const char *, ...); 74 void vprintk(const char *, _BSD_VA_LIST_); 75 #endif 76 77 #endif 78 79 #endif /* _XEN_H */ 80 81 /****************************************************************************** 82 * os.h 83 * 84 * random collection of macros and definition 85 */ 86 87 #ifndef _OS_H_ 88 #define _OS_H_ 89 90 /* 91 * These are the segment descriptors provided for us by the hypervisor. 92 * For now, these are hardwired -- guest OSes cannot update the GDT 93 * or LDT. 94 * 95 * It shouldn't be hard to support descriptor-table frobbing -- let me 96 * know if the BSD or XP ports require flexibility here. 97 */ 98 99 100 /* 101 * these are also defined in xen-public/xen.h but can't be pulled in as 102 * they are used in start of day assembly. Need to clean up the .h files 103 * a bit more... 104 */ 105 106 #ifndef FLAT_RING1_CS 107 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 108 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 109 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 110 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 111 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 112 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 113 #endif 114 115 #define __KERNEL_CS FLAT_RING1_CS 116 #define __KERNEL_DS FLAT_RING1_DS 117 118 /* Everything below this point is not included by assembler (.S) files. */ 119 #ifndef _LOCORE 120 121 /* some function prototypes */ 122 void trap_init(void); 123 void xpq_flush_cache(void); 124 125 #define xendomain_is_dom0() (xen_start_info.flags & SIF_INITDOMAIN) 126 #define xendomain_is_privileged() (xen_start_info.flags & SIF_PRIVILEGED) 127 128 /* 129 * STI/CLI equivalents. These basically set and clear the virtual 130 * event_enable flag in the shared_info structure. Note that when 131 * the enable bit is set, there may be pending events to be handled. 132 * We may therefore call into do_hypervisor_callback() directly. 133 */ 134 135 #define __save_flags(x) \ 136 do { \ 137 (x) = curcpu()->ci_vcpu->evtchn_upcall_mask; \ 138 } while (0) 139 140 #define __restore_flags(x) \ 141 do { \ 142 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 143 __insn_barrier(); \ 144 if ((_vci->evtchn_upcall_mask = (x)) == 0) { \ 145 x86_lfence(); \ 146 if (__predict_false(_vci->evtchn_upcall_pending)) \ 147 hypervisor_force_callback(); \ 148 } \ 149 } while (0) 150 151 #define __cli() \ 152 do { \ 153 curcpu()->ci_vcpu->evtchn_upcall_mask = 1; \ 154 x86_lfence(); \ 155 } while (0) 156 157 #define __sti() \ 158 do { \ 159 volatile struct vcpu_info *_vci = curcpu()->ci_vcpu; \ 160 __insn_barrier(); \ 161 _vci->evtchn_upcall_mask = 0; \ 162 x86_lfence(); /* unmask then check (avoid races) */ \ 163 if (__predict_false(_vci->evtchn_upcall_pending)) \ 164 hypervisor_force_callback(); \ 165 } while (0) 166 167 #define cli() __cli() 168 #define sti() __sti() 169 #define save_flags(x) __save_flags(x) 170 #define restore_flags(x) __restore_flags(x) 171 #define save_and_cli(x) do { \ 172 __save_flags(x); \ 173 __cli(); \ 174 } while (/* CONSTCOND */ 0) 175 #define save_and_sti(x) __save_and_sti(x) 176 177 /* 178 * always assume we're on multiprocessor. We don't know how many CPU the 179 * underlying hardware has. 180 */ 181 #define __LOCK_PREFIX "lock; " 182 183 #define XATOMIC_T u_long 184 #ifdef __x86_64__ 185 #define LONG_SHIFT 6 186 #define LONG_MASK 63 187 #else /* __x86_64__ */ 188 #define LONG_SHIFT 5 189 #define LONG_MASK 31 190 #endif /* __x86_64__ */ 191 192 #define xen_ffs __builtin_ffsl 193 194 static __inline XATOMIC_T 195 xen_atomic_xchg(volatile XATOMIC_T *ptr, unsigned long val) 196 { 197 unsigned long result; 198 199 __asm volatile(__LOCK_PREFIX 200 #ifdef __x86_64__ 201 "xchgq %0,%1" 202 #else 203 "xchgl %0,%1" 204 #endif 205 :"=r" (result) 206 :"m" (*ptr), "0" (val) 207 :"memory"); 208 209 return result; 210 } 211 212 static inline uint16_t 213 xen_atomic_cmpxchg16(volatile uint16_t *ptr, uint16_t val, uint16_t newval) 214 { 215 unsigned long result; 216 217 __asm volatile(__LOCK_PREFIX 218 "cmpxchgw %w1,%2" 219 :"=a" (result) 220 :"q"(newval), "m" (*ptr), "0" (val) 221 :"memory"); 222 223 return result; 224 } 225 226 static __inline void 227 xen_atomic_setbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 228 #ifdef __x86_64__ 229 __asm volatile("lock ; orq %1,%0" : "=m" (*ptr) : "ir" (bits)); 230 #else 231 __asm volatile("lock ; orl %1,%0" : "=m" (*ptr) : "ir" (bits)); 232 #endif 233 } 234 235 static __inline void 236 xen_atomic_clearbits_l (volatile XATOMIC_T *ptr, unsigned long bits) { 237 #ifdef __x86_64__ 238 __asm volatile("lock ; andq %1,%0" : "=m" (*ptr) : "ir" (~bits)); 239 #else 240 __asm volatile("lock ; andl %1,%0" : "=m" (*ptr) : "ir" (~bits)); 241 #endif 242 } 243 244 static __inline XATOMIC_T 245 xen_atomic_test_and_clear_bit(volatile void *ptr, unsigned long bitno) 246 { 247 int result; 248 249 __asm volatile(__LOCK_PREFIX 250 #ifdef __x86_64__ 251 "btrq %2,%1 ;" 252 "sbbq %0,%0" 253 #else 254 "btrl %2,%1 ;" 255 "sbbl %0,%0" 256 #endif 257 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 258 :"Ir" (bitno) : "memory"); 259 return result; 260 } 261 262 static __inline XATOMIC_T 263 xen_atomic_test_and_set_bit(volatile void *ptr, unsigned long bitno) 264 { 265 long result; 266 267 __asm volatile(__LOCK_PREFIX 268 #ifdef __x86_64__ 269 "btsq %2,%1 ;" 270 "sbbq %0,%0" 271 #else 272 "btsl %2,%1 ;" 273 "sbbl %0,%0" 274 #endif 275 :"=r" (result), "=m" (*(volatile XATOMIC_T *)(ptr)) 276 :"Ir" (bitno) : "memory"); 277 return result; 278 } 279 280 static __inline int 281 xen_constant_test_bit(const volatile void *ptr, unsigned long bitno) 282 { 283 return ((1UL << (bitno & LONG_MASK)) & 284 (((const volatile XATOMIC_T *) ptr)[bitno >> LONG_SHIFT])) != 0; 285 } 286 287 static __inline XATOMIC_T 288 xen_variable_test_bit(const volatile void *ptr, unsigned long bitno) 289 { 290 long result; 291 292 __asm volatile( 293 #ifdef __x86_64__ 294 "btq %2,%1 ;" 295 "sbbq %0,%0" 296 #else 297 "btl %2,%1 ;" 298 "sbbl %0,%0" 299 #endif 300 :"=r" (result) 301 :"m" (*(const volatile XATOMIC_T *)(ptr)), "Ir" (bitno)); 302 return result; 303 } 304 305 #define xen_atomic_test_bit(ptr, bitno) \ 306 (__builtin_constant_p(bitno) ? \ 307 xen_constant_test_bit((ptr),(bitno)) : \ 308 xen_variable_test_bit((ptr),(bitno))) 309 310 static __inline void 311 xen_atomic_set_bit(volatile void *ptr, unsigned long bitno) 312 { 313 __asm volatile(__LOCK_PREFIX 314 #ifdef __x86_64__ 315 "btsq %1,%0" 316 #else 317 "btsl %1,%0" 318 #endif 319 :"=m" (*(volatile XATOMIC_T *)(ptr)) 320 :"Ir" (bitno)); 321 } 322 323 static __inline void 324 xen_atomic_clear_bit(volatile void *ptr, unsigned long bitno) 325 { 326 __asm volatile(__LOCK_PREFIX 327 #ifdef __x86_64__ 328 "btrq %1,%0" 329 #else 330 "btrl %1,%0" 331 #endif 332 :"=m" (*(volatile XATOMIC_T *)(ptr)) 333 :"Ir" (bitno)); 334 } 335 336 #undef XATOMIC_T 337 338 void wbinvd(void); 339 340 #endif /* !__ASSEMBLY__ */ 341 342 #endif /* _OS_H_ */ 343