1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #ifndef _VM_SEG_KP_H 28*7c478bd9Sstevel@tonic-gate #define _VM_SEG_KP_H 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate /* 31*7c478bd9Sstevel@tonic-gate * segkp (as in kernel pageable) is a segment driver that supports allocation 32*7c478bd9Sstevel@tonic-gate * of page-aligned variable size of vm resources. 33*7c478bd9Sstevel@tonic-gate * 34*7c478bd9Sstevel@tonic-gate * Each vm resource represents a page-aligned range of virtual addresses. 35*7c478bd9Sstevel@tonic-gate * The caller may specify whether the resource should include a redzone, 36*7c478bd9Sstevel@tonic-gate * be locked down, or be zero initialized. 37*7c478bd9Sstevel@tonic-gate */ 38*7c478bd9Sstevel@tonic-gate 39*7c478bd9Sstevel@tonic-gate #include <vm/seg.h> 40*7c478bd9Sstevel@tonic-gate #include <sys/vmem.h> 41*7c478bd9Sstevel@tonic-gate 42*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 43*7c478bd9Sstevel@tonic-gate extern "C" { 44*7c478bd9Sstevel@tonic-gate #endif 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate #ifdef _KERNEL 47*7c478bd9Sstevel@tonic-gate 48*7c478bd9Sstevel@tonic-gate /* 49*7c478bd9Sstevel@tonic-gate * Private information per overall segkp segment (as opposed 50*7c478bd9Sstevel@tonic-gate * to per resource within segment). There are as many anon slots 51*7c478bd9Sstevel@tonic-gate * allocated as there there are pages in the segment. 52*7c478bd9Sstevel@tonic-gate */ 53*7c478bd9Sstevel@tonic-gate struct segkp_segdata { 54*7c478bd9Sstevel@tonic-gate struct anon_hdr *kpsd_anon; /* anon structs */ 55*7c478bd9Sstevel@tonic-gate vmem_t *kpsd_arena; /* virtual memory descriptor */ 56*7c478bd9Sstevel@tonic-gate struct segkp_data **kpsd_hash; /* Hash table for lookups */ 57*7c478bd9Sstevel@tonic-gate }; 58*7c478bd9Sstevel@tonic-gate 59*7c478bd9Sstevel@tonic-gate #define SEGKP_VMEM(seg) (((struct segkp_segdata *)(seg)->s_data)->kpsd_arena) 60*7c478bd9Sstevel@tonic-gate 61*7c478bd9Sstevel@tonic-gate /* 62*7c478bd9Sstevel@tonic-gate * A hash table is used to aid in the lookup of a kpd's based on vaddr. 63*7c478bd9Sstevel@tonic-gate * Since the heaviest use of segkp occurs from segkp_*get and segkp_*release, 64*7c478bd9Sstevel@tonic-gate * the hashing is based on the vaddr used by these routines. 65*7c478bd9Sstevel@tonic-gate */ 66*7c478bd9Sstevel@tonic-gate #define SEGKP_HASHSZ 256 /* power of two */ 67*7c478bd9Sstevel@tonic-gate #define SEGKP_HASHMASK (SEGKP_HASHSZ - 1) 68*7c478bd9Sstevel@tonic-gate #define SEGKP_HASH(vaddr) \ 69*7c478bd9Sstevel@tonic-gate ((int)(((uintptr_t)vaddr >> PAGESHIFT) & SEGKP_HASHMASK)) 70*7c478bd9Sstevel@tonic-gate 71*7c478bd9Sstevel@tonic-gate struct segkp_data { 72*7c478bd9Sstevel@tonic-gate kmutex_t kp_lock; /* per resource lock */ 73*7c478bd9Sstevel@tonic-gate caddr_t kp_base; /* starting addr of chunk */ 74*7c478bd9Sstevel@tonic-gate size_t kp_len; /* # of bytes */ 75*7c478bd9Sstevel@tonic-gate uint_t kp_flags; /* state info */ 76*7c478bd9Sstevel@tonic-gate int kp_cookie; /* index into cache array */ 77*7c478bd9Sstevel@tonic-gate ulong_t kp_anon_idx; /* index into main anon array */ 78*7c478bd9Sstevel@tonic-gate /* in segkp_segdata */ 79*7c478bd9Sstevel@tonic-gate struct anon_hdr *kp_anon; /* anon structs */ 80*7c478bd9Sstevel@tonic-gate struct segkp_data *kp_next; /* ptr to next in hash chain */ 81*7c478bd9Sstevel@tonic-gate }; 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate /* 84*7c478bd9Sstevel@tonic-gate * Flag bits 85*7c478bd9Sstevel@tonic-gate * 86*7c478bd9Sstevel@tonic-gate */ 87*7c478bd9Sstevel@tonic-gate #define KPD_ZERO 0x01 /* initialize resource with 0 */ 88*7c478bd9Sstevel@tonic-gate #define KPD_LOCKED 0x02 /* resources locked */ 89*7c478bd9Sstevel@tonic-gate #define KPD_NO_ANON 0x04 /* no swap resources required */ 90*7c478bd9Sstevel@tonic-gate #define KPD_HASREDZONE 0x08 /* include a redzone */ 91*7c478bd9Sstevel@tonic-gate #define KPD_NOWAIT 0x10 /* do not wait for res. if unavail. */ 92*7c478bd9Sstevel@tonic-gate #define KPD_WRITEDIRTY 0x20 /* dirty pages should be flushed */ 93*7c478bd9Sstevel@tonic-gate #define KPD_HASAMP 0x40 /* anon_hdr managed by caller */ 94*7c478bd9Sstevel@tonic-gate 95*7c478bd9Sstevel@tonic-gate /* 96*7c478bd9Sstevel@tonic-gate * A cache of segkp elements may be created via segkp_cache_init(). 97*7c478bd9Sstevel@tonic-gate * The elements on the freelist all have the same len and flags value. 98*7c478bd9Sstevel@tonic-gate * The cookie passed to the client is an index into the freelist array. 99*7c478bd9Sstevel@tonic-gate */ 100*7c478bd9Sstevel@tonic-gate struct segkp_cache { 101*7c478bd9Sstevel@tonic-gate int kpf_max; /* max # of elements allowed */ 102*7c478bd9Sstevel@tonic-gate int kpf_count; /* current no. of elments */ 103*7c478bd9Sstevel@tonic-gate int kpf_inuse; /* list inuse */ 104*7c478bd9Sstevel@tonic-gate uint_t kpf_flags; /* seg_kp flag value */ 105*7c478bd9Sstevel@tonic-gate size_t kpf_len; /* len of resource */ 106*7c478bd9Sstevel@tonic-gate struct seg *kpf_seg; /* segment */ 107*7c478bd9Sstevel@tonic-gate struct segkp_data *kpf_list; /* list of kpd's */ 108*7c478bd9Sstevel@tonic-gate }; 109*7c478bd9Sstevel@tonic-gate #define SEGKP_MAX_CACHE 4 /* Number of caches maintained */ 110*7c478bd9Sstevel@tonic-gate 111*7c478bd9Sstevel@tonic-gate /* 112*7c478bd9Sstevel@tonic-gate * Define redzone, and stack_to_memory macros. 113*7c478bd9Sstevel@tonic-gate * The redzone is PAGESIZE bytes. 114*7c478bd9Sstevel@tonic-gate */ 115*7c478bd9Sstevel@tonic-gate #ifdef STACK_GROWTH_DOWN 116*7c478bd9Sstevel@tonic-gate #define KPD_REDZONE(kpd) (0) 117*7c478bd9Sstevel@tonic-gate #define stom(v, flags) (((flags) & KPD_HASREDZONE) ? (v) + PAGESIZE : (v)) 118*7c478bd9Sstevel@tonic-gate 119*7c478bd9Sstevel@tonic-gate #else /* STACK_GROWTH_DOWN */ 120*7c478bd9Sstevel@tonic-gate 121*7c478bd9Sstevel@tonic-gate #define KPD_REDZONE(kpd) (btop(kpd->kp_len) - 1) 122*7c478bd9Sstevel@tonic-gate #define stom(v) (v) 123*7c478bd9Sstevel@tonic-gate #endif /* STACK_GROWTH_DOWN */ 124*7c478bd9Sstevel@tonic-gate 125*7c478bd9Sstevel@tonic-gate #define SEGKP_MAPLEN(len, flags) \ 126*7c478bd9Sstevel@tonic-gate (((flags) & KPD_HASREDZONE) ? (len) - PAGESIZE : (len)) 127*7c478bd9Sstevel@tonic-gate 128*7c478bd9Sstevel@tonic-gate extern struct seg *segkp; 129*7c478bd9Sstevel@tonic-gate /* If segkp becomes more than one seg this test will need changing. */ 130*7c478bd9Sstevel@tonic-gate #define SEG_IS_SEGKP(SEG) ((SEG) == segkp) 131*7c478bd9Sstevel@tonic-gate 132*7c478bd9Sstevel@tonic-gate /* 133*7c478bd9Sstevel@tonic-gate * Public routine declarations not part of the segment ops vector go here. 134*7c478bd9Sstevel@tonic-gate */ 135*7c478bd9Sstevel@tonic-gate int segkp_create(struct seg *seg); 136*7c478bd9Sstevel@tonic-gate caddr_t segkp_get(struct seg *seg, size_t len, uint_t flags); 137*7c478bd9Sstevel@tonic-gate void segkp_release(struct seg *seg, caddr_t vaddr); 138*7c478bd9Sstevel@tonic-gate void * segkp_cache_init(struct seg *seg, int maxsize, size_t len, 139*7c478bd9Sstevel@tonic-gate uint_t flags); 140*7c478bd9Sstevel@tonic-gate void segkp_cache_free(); 141*7c478bd9Sstevel@tonic-gate caddr_t segkp_cache_get(void *cookie); 142*7c478bd9Sstevel@tonic-gate int segkp_map_red(void); 143*7c478bd9Sstevel@tonic-gate void segkp_unmap_red(void); 144*7c478bd9Sstevel@tonic-gate size_t swapsize(caddr_t v); 145*7c478bd9Sstevel@tonic-gate 146*7c478bd9Sstevel@tonic-gate /* Special currently only used by schedctl. */ 147*7c478bd9Sstevel@tonic-gate struct anon_map; /* Make the compiler happy about the next line. */ 148*7c478bd9Sstevel@tonic-gate caddr_t segkp_get_withanonmap(struct seg *, size_t, uint_t, struct anon_map *); 149*7c478bd9Sstevel@tonic-gate 150*7c478bd9Sstevel@tonic-gate /* 151*7c478bd9Sstevel@tonic-gate * We allow explicit calls to segkp_fault, even though it's part 152*7c478bd9Sstevel@tonic-gate * of the segkp ops vector. 153*7c478bd9Sstevel@tonic-gate */ 154*7c478bd9Sstevel@tonic-gate faultcode_t segkp_fault(struct hat *hat, struct seg *seg, caddr_t addr, 155*7c478bd9Sstevel@tonic-gate size_t len, enum fault_type type, enum seg_rw rw); 156*7c478bd9Sstevel@tonic-gate 157*7c478bd9Sstevel@tonic-gate #endif /* _KERNEL */ 158*7c478bd9Sstevel@tonic-gate 159*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 160*7c478bd9Sstevel@tonic-gate } 161*7c478bd9Sstevel@tonic-gate #endif 162*7c478bd9Sstevel@tonic-gate 163*7c478bd9Sstevel@tonic-gate #endif /* _VM_SEG_KP_H */ 164