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 2008 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 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 /* 35 * VM - Hardware Address Translation management. 36 * 37 * This file describes the contents of the x86_64 HAT data structures. 38 */ 39 #include <sys/types.h> 40 #include <sys/t_lock.h> 41 #include <sys/cpuvar.h> 42 #include <sys/x_call.h> 43 #include <vm/seg.h> 44 #include <vm/page.h> 45 #include <sys/vmparam.h> 46 #include <sys/vm_machparam.h> 47 #include <sys/promif.h> 48 #include <vm/hat_pte.h> 49 #include <vm/htable.h> 50 #include <vm/hment.h> 51 52 /* 53 * The essential data types involved: 54 * 55 * htable_t - There is one of these for each page table and it is used 56 * by the HAT to manage the page table. 57 * 58 * hment_t - Links together multiple PTEs to a single page. 59 */ 60 61 /* 62 * VLP processes have a 32 bit address range, so their top level is 2 and 63 * with only 4 PTEs in that table. 64 */ 65 #define VLP_LEVEL (2) 66 #define VLP_NUM_PTES (4) 67 #define VLP_SIZE (VLP_NUM_PTES * sizeof (x86pte_t)) 68 #define TOP_LEVEL(h) (((h)->hat_flags & HAT_VLP) ? VLP_LEVEL : mmu.max_level) 69 #define VLP_COPY(fromptep, toptep) { \ 70 toptep[0] = fromptep[0]; \ 71 toptep[1] = fromptep[1]; \ 72 toptep[2] = fromptep[2]; \ 73 toptep[3] = fromptep[3]; \ 74 } 75 76 /* 77 * The hat struct exists for each address space. 78 */ 79 struct hat { 80 kmutex_t hat_mutex; 81 struct as *hat_as; 82 uint_t hat_stats; 83 pgcnt_t hat_pages_mapped[MAX_PAGE_LEVEL + 1]; 84 pgcnt_t hat_ism_pgcnt; 85 cpuset_t hat_cpus; 86 uint16_t hat_flags; 87 htable_t *hat_htable; /* top level htable */ 88 struct hat *hat_next; 89 struct hat *hat_prev; 90 uint_t hat_num_hash; /* number of htable hash buckets */ 91 htable_t **hat_ht_hash; /* htable hash buckets */ 92 htable_t *hat_ht_cached; /* cached free htables */ 93 x86pte_t hat_vlp_ptes[VLP_NUM_PTES]; 94 #if defined(__amd64) && defined(__xpv) 95 pfn_t hat_user_ptable; /* alt top ptable for user mode */ 96 #endif 97 }; 98 typedef struct hat hat_t; 99 100 #define PGCNT_INC(hat, level) \ 101 atomic_add_long(&(hat)->hat_pages_mapped[level], 1); 102 #define PGCNT_DEC(hat, level) \ 103 atomic_add_long(&(hat)->hat_pages_mapped[level], -1); 104 105 /* 106 * Flags for the hat_flags field 107 * 108 * HAT_FREEING - set when HAT is being destroyed - mostly used to detect that 109 * demap()s can be avoided. 110 * 111 * HAT_VLP - indicates a 32 bit process has a virtual address range less than 112 * the hardware's physical address range. (VLP->Virtual Less-than Physical) 113 * Note - never used on the hypervisor. 114 * 115 * HAT_VICTIM - This is set while a hat is being examined for page table 116 * stealing and prevents it from being freed. 117 * 118 * HAT_SHARED - The hat has exported it's page tables via hat_share() 119 * 120 * HAT_PINNED - On the hypervisor, indicates the top page table has been pinned. 121 */ 122 #define HAT_FREEING (0x0001) 123 #define HAT_VLP (0x0002) 124 #define HAT_VICTIM (0x0004) 125 #define HAT_SHARED (0x0008) 126 #define HAT_PINNED (0x0010) 127 128 /* 129 * Additional platform attribute for hat_devload() to force no caching. 130 */ 131 #define HAT_PLAT_NOCACHE (0x100000) 132 133 /* 134 * Simple statistics for the HAT. These are just counters that are 135 * atomically incremented. They can be reset directly from the kernel 136 * debugger. 137 */ 138 struct hatstats { 139 ulong_t hs_reap_attempts; 140 ulong_t hs_reaped; 141 ulong_t hs_steals; 142 ulong_t hs_ptable_allocs; 143 ulong_t hs_ptable_frees; 144 ulong_t hs_htable_rgets; /* allocs from reserve */ 145 ulong_t hs_htable_rputs; /* putbacks to reserve */ 146 ulong_t hs_htable_shared; /* number of htables shared */ 147 ulong_t hs_htable_unshared; /* number of htables unshared */ 148 ulong_t hs_hm_alloc; 149 ulong_t hs_hm_free; 150 ulong_t hs_hm_put_reserve; 151 ulong_t hs_hm_get_reserve; 152 ulong_t hs_hm_steals; 153 ulong_t hs_hm_steal_exam; 154 ulong_t hs_tlb_inval_delayed; 155 }; 156 extern struct hatstats hatstat; 157 #ifdef DEBUG 158 #define HATSTAT_INC(x) (++hatstat.x) 159 #else 160 #define HATSTAT_INC(x) (0) 161 #endif 162 163 #if defined(_KERNEL) 164 165 /* 166 * Useful macro to align hat_XXX() address arguments to a page boundary 167 */ 168 #define ALIGN2PAGE(a) ((uintptr_t)(a) & MMU_PAGEMASK) 169 #define IS_PAGEALIGNED(a) (((uintptr_t)(a) & MMU_PAGEOFFSET) == 0) 170 171 extern uint_t khat_running; /* set at end of hat_kern_setup() */ 172 extern cpuset_t khat_cpuset; /* cpuset for kernal address demap Xcalls */ 173 extern kmutex_t hat_list_lock; 174 extern kcondvar_t hat_list_cv; 175 176 177 178 /* 179 * Interfaces to setup a cpu private mapping (ie. preemption disabled). 180 * The attr and flags arguments are the same as for hat_devload(). 181 * setup() must be called once, then any number of calls to remap(), 182 * followed by a final call to release() 183 * 184 * Used by ppcopy(), page_zero(), the memscrubber, and the kernel debugger. 185 */ 186 typedef paddr_t hat_mempte_t; /* phys addr of PTE */ 187 extern hat_mempte_t hat_mempte_setup(caddr_t addr); 188 extern void hat_mempte_remap(pfn_t, caddr_t, hat_mempte_t, 189 uint_t attr, uint_t flags); 190 extern void hat_mempte_release(caddr_t addr, hat_mempte_t); 191 192 /* 193 * Interfaces to manage which thread has access to htable and hment reserves. 194 * The USE_HAT_RESERVES macro should always be recomputed in full. Its value 195 * (due to curthread) can change after any call into kmem/vmem. 196 */ 197 extern uint_t can_steal_post_boot; 198 extern uint_t use_boot_reserve; 199 #define USE_HAT_RESERVES() \ 200 (use_boot_reserve || curthread->t_hatdepth > 1 || \ 201 panicstr != NULL || vmem_is_populator()) 202 203 /* 204 * initialization stuff needed by by startup, mp_startup... 205 */ 206 extern void hat_cpu_online(struct cpu *); 207 extern void hat_cpu_offline(struct cpu *); 208 extern void setup_vaddr_for_ppcopy(struct cpu *); 209 extern void teardown_vaddr_for_ppcopy(struct cpu *); 210 extern void clear_boot_mappings(uintptr_t, uintptr_t); 211 212 /* 213 * magic value to indicate that all TLB entries should be demapped. 214 */ 215 #define DEMAP_ALL_ADDR (~(uintptr_t)0) 216 217 /* 218 * not in any include file??? 219 */ 220 extern void halt(char *fmt); 221 222 /* 223 * x86 specific routines for use online in setup or i86pc/vm files 224 */ 225 extern void hat_kern_alloc(caddr_t segmap_base, size_t segmap_size, 226 caddr_t ekernelheap); 227 extern void hat_kern_setup(void); 228 extern void hat_tlb_inval(struct hat *hat, uintptr_t va); 229 extern void hat_pte_unmap(htable_t *ht, uint_t entry, uint_t flags, 230 x86pte_t old_pte, void *pte_ptr); 231 extern void hat_init_finish(void); 232 extern caddr_t hat_kpm_pfn2va(pfn_t pfn); 233 extern pfn_t hat_kpm_va2pfn(caddr_t); 234 extern page_t *hat_kpm_vaddr2page(caddr_t); 235 extern uintptr_t hat_kernelbase(uintptr_t); 236 extern void hat_kmap_init(uintptr_t base, size_t len); 237 238 extern hment_t *hati_page_unmap(page_t *pp, htable_t *ht, uint_t entry); 239 240 #if !defined(__xpv) 241 /* 242 * routines to deal with delayed TLB invalidations for idle CPUs 243 */ 244 extern void tlb_going_idle(void); 245 extern void tlb_service(void); 246 #endif 247 248 /* 249 * Hat switch function invoked to load a new context into %cr3 250 */ 251 extern void hat_switch(struct hat *hat); 252 253 #ifdef __xpv 254 /* 255 * Interfaces to use around code that maps/unmaps grant table references. 256 */ 257 extern void hat_prepare_mapping(hat_t *, caddr_t, uint64_t *); 258 extern void hat_release_mapping(hat_t *, caddr_t); 259 260 #define XPV_DISALLOW_MIGRATE() xen_block_migrate() 261 #define XPV_ALLOW_MIGRATE() xen_allow_migrate() 262 263 #else 264 265 #define XPV_DISALLOW_MIGRATE() /* nothing */ 266 #define XPV_ALLOW_MIGRATE() /* nothing */ 267 268 #define pfn_is_foreign(pfn) __lintzero 269 270 #endif 271 272 273 #endif /* _KERNEL */ 274 275 #ifdef __cplusplus 276 } 277 #endif 278 279 #endif /* _VM_HAT_I86_H */ 280