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 kmutex_t hat_switch_mutex; 83 struct as *hat_as; 84 uint_t hat_stats; 85 pgcnt_t hat_pages_mapped[MAX_PAGE_LEVEL + 1]; 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 }; 96 typedef struct hat hat_t; 97 98 #define PGCNT_INC(hat, level) \ 99 atomic_add_long(&(hat)->hat_pages_mapped[level], 1); 100 #define PGCNT_DEC(hat, level) \ 101 atomic_add_long(&(hat)->hat_pages_mapped[level], -1); 102 103 /* 104 * Flags for the hat_flags field 105 * 106 * HAT_FREEING - set when HAT is being destroyed - mostly used to detect that 107 * demap()s can be avoided. 108 * 109 * HAT_VLP - indicates a 32 bit process has a virtual address range less than 110 * the hardware's physical address range. (VLP->Virtual Less-than Physical) 111 * 112 * HAT_VICTIM - This is set while a hat is being examined for page table 113 * stealing and prevents it from being freed. 114 * 115 * HAT_SHARED - The hat has exported it's page tables via hat_share() 116 */ 117 #define HAT_FREEING (0x0001) 118 #define HAT_VLP (0x0002) 119 #define HAT_VICTIM (0x0004) 120 #define HAT_SHARED (0x0008) 121 122 /* 123 * Additional platform attribute for hat_devload() to force no caching. 124 */ 125 #define HAT_PLAT_NOCACHE (0x100000) 126 127 /* 128 * Simple statistics for the HAT. These are just counters that are 129 * atomically incremented. They can be reset directly from the kernel 130 * debugger. 131 */ 132 struct hatstats { 133 uint64_t hs_reap_attempts; 134 uint64_t hs_reaped; 135 uint64_t hs_steals; 136 uint64_t hs_ptable_allocs; 137 uint64_t hs_ptable_frees; 138 uint64_t hs_htable_rgets; /* allocs from reserve */ 139 uint64_t hs_htable_rputs; /* putbacks to reserve */ 140 uint64_t hs_htable_shared; /* number of htables shared */ 141 uint64_t hs_htable_unshared; /* number of htables unshared */ 142 uint64_t hs_hm_alloc; 143 uint64_t hs_hm_free; 144 uint64_t hs_hm_put_reserve; 145 uint64_t hs_hm_get_reserve; 146 uint64_t hs_hm_steals; 147 uint64_t hs_hm_steal_exam; 148 }; 149 extern struct hatstats hatstat; 150 #define HATSTAT_INC(x) (atomic_add_64(&hatstat.x, 1)) 151 152 #if defined(_KERNEL) 153 154 /* 155 * Useful macro to align hat_XXX() address arguments to a page boundary 156 */ 157 #define ALIGN2PAGE(a) ((uintptr_t)(a) & MMU_PAGEMASK) 158 #define IS_PAGEALIGNED(a) (((uintptr_t)(a) & MMU_PAGEOFFSET) == 0) 159 160 extern uint_t khat_running; /* set at end of hat_kern_setup() */ 161 extern cpuset_t khat_cpuset; /* cpuset for kernal address demap Xcalls */ 162 extern kmutex_t hat_list_lock; 163 extern kcondvar_t hat_list_cv; 164 165 166 167 /* 168 * Interfaces to setup a cpu private mapping (ie. preemption disabled). 169 * The attr and flags arguments are the same as for hat_devload(). 170 * setup() must be called once, then any number of calls to remap(), 171 * followed by a final call to release() 172 * 173 * Used by ppcopy(), page_zero(), the memscrubber, and the kernel debugger. 174 */ 175 typedef paddr_t hat_mempte_t; /* phys addr of PTE */ 176 extern hat_mempte_t hat_mempte_setup(caddr_t addr); 177 extern void hat_mempte_remap(pfn_t, caddr_t, hat_mempte_t, 178 uint_t attr, uint_t flags); 179 extern void hat_mempte_release(caddr_t addr, hat_mempte_t); 180 181 /* 182 * Interfaces to manage which thread has access to htable and hment reserves. 183 * The USE_HAT_RESERVES macro should always be recomputed in full. Its value 184 * (due to curthread) can change after any call into kmem/vmem. 185 */ 186 extern uint_t can_steal_post_boot; 187 extern uint_t use_boot_reserve; 188 extern kthread_t *hat_reserves_thread; 189 #define USE_HAT_RESERVES() \ 190 (use_boot_reserve || curthread == hat_reserves_thread || \ 191 panicstr != NULL || vmem_is_populator()) 192 193 /* 194 * initialization stuff needed by by startup, mp_startup... 195 */ 196 extern void hat_cpu_online(struct cpu *); 197 extern void hat_cpu_offline(struct cpu *); 198 extern void setup_vaddr_for_ppcopy(struct cpu *); 199 extern void teardown_vaddr_for_ppcopy(struct cpu *); 200 extern void clear_boot_mappings(uintptr_t, uintptr_t); 201 202 /* 203 * magic value to indicate that all TLB entries should be demapped. 204 */ 205 #define DEMAP_ALL_ADDR (~(uintptr_t)0) 206 207 /* 208 * not in any include file??? 209 */ 210 extern void halt(char *fmt); 211 212 /* 213 * x86 specific routines for use online in setup or i86pc/vm files 214 */ 215 extern void hat_kern_alloc(caddr_t segmap_base, size_t segmap_size, 216 caddr_t ekernelheap); 217 extern void hat_kern_setup(void); 218 extern void hat_tlb_inval(struct hat *hat, uintptr_t va); 219 extern void hat_pte_unmap(htable_t *ht, uint_t entry, uint_t flags, 220 x86pte_t old_pte, void *pte_ptr); 221 extern void hat_init_finish(void); 222 extern caddr_t hat_kpm_pfn2va(pfn_t pfn); 223 extern pfn_t hat_kpm_va2pfn(caddr_t); 224 extern page_t *hat_kpm_vaddr2page(caddr_t); 225 extern uintptr_t hat_kernelbase(uintptr_t); 226 extern void hat_kmap_init(uintptr_t base, size_t len); 227 228 extern hment_t *hati_page_unmap(page_t *pp, htable_t *ht, uint_t entry); 229 /* 230 * Hat switch function invoked to load a new context into %cr3 231 */ 232 extern void hat_switch(struct hat *hat); 233 234 #define pfn_is_foreign(pfn) __lintzero 235 236 #endif /* _KERNEL */ 237 238 #ifdef __cplusplus 239 } 240 #endif 241 242 #endif /* _VM_HAT_I86_H */ 243