1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _VM_HAT_I86_H 27 #define _VM_HAT_I86_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 /* 36 * VM - Hardware Address Translation management. 37 * 38 * This file describes the contents of the x86_64 HAT data structures. 39 */ 40 #include <sys/types.h> 41 #include <sys/t_lock.h> 42 #include <sys/cpuvar.h> 43 #include <sys/x_call.h> 44 #include <vm/seg.h> 45 #include <vm/page.h> 46 #include <sys/vmparam.h> 47 #include <sys/vm_machparam.h> 48 #include <sys/promif.h> 49 #include <vm/hat_pte.h> 50 #include <vm/htable.h> 51 #include <vm/hment.h> 52 53 /* 54 * The essential data types involved: 55 * 56 * htable_t - There is one of these for each page table and it is used 57 * by the HAT to manage the page table. 58 * 59 * hment_t - Links together multiple PTEs to a single page. 60 */ 61 62 /* 63 * VLP processes have a 32 bit address range, so their top level is 2 and 64 * with only 4 PTEs in that table. 65 */ 66 #define VLP_LEVEL (2) 67 #define VLP_NUM_PTES (4) 68 #define VLP_SIZE (VLP_NUM_PTES * sizeof (x86pte_t)) 69 #define TOP_LEVEL(h) (((h)->hat_flags & HAT_VLP) ? VLP_LEVEL : mmu.max_level) 70 #define VLP_COPY(fromptep, toptep) { \ 71 toptep[0] = fromptep[0]; \ 72 toptep[1] = fromptep[1]; \ 73 toptep[2] = fromptep[2]; \ 74 toptep[3] = fromptep[3]; \ 75 } 76 77 /* 78 * The hat struct exists for each address space. 79 */ 80 struct hat { 81 kmutex_t hat_mutex; 82 struct as *hat_as; 83 uint_t hat_stats; 84 pgcnt_t hat_pages_mapped[MAX_PAGE_LEVEL + 1]; 85 pgcnt_t hat_ism_pgcnt; 86 cpuset_t hat_cpus; 87 uint16_t hat_flags; 88 htable_t *hat_htable; /* top level htable */ 89 struct hat *hat_next; 90 struct hat *hat_prev; 91 uint_t hat_num_hash; /* number of htable hash buckets */ 92 htable_t **hat_ht_hash; /* htable hash buckets */ 93 htable_t *hat_ht_cached; /* cached free htables */ 94 x86pte_t hat_vlp_ptes[VLP_NUM_PTES]; 95 #if defined(__amd64) && defined(__xpv) 96 pfn_t hat_user_ptable; /* alt top ptable for user mode */ 97 #endif 98 }; 99 typedef struct hat hat_t; 100 101 #define PGCNT_INC(hat, level) \ 102 atomic_add_long(&(hat)->hat_pages_mapped[level], 1); 103 #define PGCNT_DEC(hat, level) \ 104 atomic_add_long(&(hat)->hat_pages_mapped[level], -1); 105 106 /* 107 * Flags for the hat_flags field 108 * 109 * HAT_FREEING - set when HAT is being destroyed - mostly used to detect that 110 * demap()s can be avoided. 111 * 112 * HAT_VLP - indicates a 32 bit process has a virtual address range less than 113 * the hardware's physical address range. (VLP->Virtual Less-than Physical) 114 * Note - never used on the hypervisor. 115 * 116 * HAT_VICTIM - This is set while a hat is being examined for page table 117 * stealing and prevents it from being freed. 118 * 119 * HAT_SHARED - The hat has exported it's page tables via hat_share() 120 * 121 * HAT_PINNED - On the hypervisor, indicates the top page table has been pinned. 122 */ 123 #define HAT_FREEING (0x0001) 124 #define HAT_VLP (0x0002) 125 #define HAT_VICTIM (0x0004) 126 #define HAT_SHARED (0x0008) 127 #define HAT_PINNED (0x0010) 128 129 /* 130 * Additional platform attribute for hat_devload() to force no caching. 131 */ 132 #define HAT_PLAT_NOCACHE (0x100000) 133 134 /* 135 * Simple statistics for the HAT. These are just counters that are 136 * atomically incremented. They can be reset directly from the kernel 137 * debugger. 138 */ 139 struct hatstats { 140 ulong_t hs_reap_attempts; 141 ulong_t hs_reaped; 142 ulong_t hs_steals; 143 ulong_t hs_ptable_allocs; 144 ulong_t hs_ptable_frees; 145 ulong_t hs_htable_rgets; /* allocs from reserve */ 146 ulong_t hs_htable_rputs; /* putbacks to reserve */ 147 ulong_t hs_htable_shared; /* number of htables shared */ 148 ulong_t hs_htable_unshared; /* number of htables unshared */ 149 ulong_t hs_hm_alloc; 150 ulong_t hs_hm_free; 151 ulong_t hs_hm_put_reserve; 152 ulong_t hs_hm_get_reserve; 153 ulong_t hs_hm_steals; 154 ulong_t hs_hm_steal_exam; 155 ulong_t hs_tlb_inval_delayed; 156 }; 157 extern struct hatstats hatstat; 158 #ifdef DEBUG 159 #define HATSTAT_INC(x) (++hatstat.x) 160 #else 161 #define HATSTAT_INC(x) (0) 162 #endif 163 164 #if defined(_KERNEL) 165 166 /* 167 * Useful macro to align hat_XXX() address arguments to a page boundary 168 */ 169 #define ALIGN2PAGE(a) ((uintptr_t)(a) & MMU_PAGEMASK) 170 #define IS_PAGEALIGNED(a) (((uintptr_t)(a) & MMU_PAGEOFFSET) == 0) 171 172 extern uint_t khat_running; /* set at end of hat_kern_setup() */ 173 extern cpuset_t khat_cpuset; /* cpuset for kernal address demap Xcalls */ 174 extern kmutex_t hat_list_lock; 175 extern kcondvar_t hat_list_cv; 176 177 178 179 /* 180 * Interfaces to setup a cpu private mapping (ie. preemption disabled). 181 * The attr and flags arguments are the same as for hat_devload(). 182 * setup() must be called once, then any number of calls to remap(), 183 * followed by a final call to release() 184 * 185 * Used by ppcopy(), page_zero(), the memscrubber, and the kernel debugger. 186 */ 187 typedef paddr_t hat_mempte_t; /* phys addr of PTE */ 188 extern hat_mempte_t hat_mempte_setup(caddr_t addr); 189 extern void hat_mempte_remap(pfn_t, caddr_t, hat_mempte_t, 190 uint_t attr, uint_t flags); 191 extern void hat_mempte_release(caddr_t addr, hat_mempte_t); 192 193 /* 194 * Interfaces to manage which thread has access to htable and hment reserves. 195 * The USE_HAT_RESERVES macro should always be recomputed in full. Its value 196 * (due to curthread) can change after any call into kmem/vmem. 197 */ 198 extern uint_t can_steal_post_boot; 199 extern uint_t use_boot_reserve; 200 #define USE_HAT_RESERVES() \ 201 (use_boot_reserve || curthread->t_hatdepth > 1 || \ 202 panicstr != NULL || vmem_is_populator()) 203 204 /* 205 * initialization stuff needed by by startup, mp_startup... 206 */ 207 extern void hat_cpu_online(struct cpu *); 208 extern void hat_cpu_offline(struct cpu *); 209 extern void setup_vaddr_for_ppcopy(struct cpu *); 210 extern void teardown_vaddr_for_ppcopy(struct cpu *); 211 extern void clear_boot_mappings(uintptr_t, uintptr_t); 212 213 /* 214 * magic value to indicate that all TLB entries should be demapped. 215 */ 216 #define DEMAP_ALL_ADDR (~(uintptr_t)0) 217 218 /* 219 * not in any include file??? 220 */ 221 extern void halt(char *fmt); 222 223 /* 224 * x86 specific routines for use online in setup or i86pc/vm files 225 */ 226 extern void hat_kern_alloc(caddr_t segmap_base, size_t segmap_size, 227 caddr_t ekernelheap); 228 extern void hat_kern_setup(void); 229 extern void hat_tlb_inval(struct hat *hat, uintptr_t va); 230 extern void hat_pte_unmap(htable_t *ht, uint_t entry, uint_t flags, 231 x86pte_t old_pte, void *pte_ptr); 232 extern void hat_init_finish(void); 233 extern caddr_t hat_kpm_pfn2va(pfn_t pfn); 234 extern pfn_t hat_kpm_va2pfn(caddr_t); 235 extern page_t *hat_kpm_vaddr2page(caddr_t); 236 extern uintptr_t hat_kernelbase(uintptr_t); 237 extern void hat_kmap_init(uintptr_t base, size_t len); 238 239 extern hment_t *hati_page_unmap(page_t *pp, htable_t *ht, uint_t entry); 240 241 #if !defined(__xpv) 242 /* 243 * routines to deal with delayed TLB invalidations for idle CPUs 244 */ 245 extern void tlb_going_idle(void); 246 extern void tlb_service(void); 247 #endif 248 249 /* 250 * Hat switch function invoked to load a new context into %cr3 251 */ 252 extern void hat_switch(struct hat *hat); 253 254 #ifdef __xpv 255 /* 256 * Interfaces to use around code that maps/unmaps grant table references. 257 */ 258 extern void hat_prepare_mapping(hat_t *, caddr_t); 259 extern void hat_release_mapping(hat_t *, caddr_t); 260 261 #define XPV_DISALLOW_MIGRATE() xen_block_migrate() 262 #define XPV_ALLOW_MIGRATE() xen_allow_migrate() 263 264 #else 265 266 #define XPV_DISALLOW_MIGRATE() /* nothing */ 267 #define XPV_ALLOW_MIGRATE() /* nothing */ 268 269 #define pfn_is_foreign(pfn) __lintzero 270 271 #endif 272 273 274 #endif /* _KERNEL */ 275 276 #ifdef __cplusplus 277 } 278 #endif 279 280 #endif /* _VM_HAT_I86_H */ 281