Annotation of sys/uvm/uvm_amap_i.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: uvm_amap_i.h,v 1.18 2007/06/18 21:51:15 pedro Exp $ */
! 2: /* $NetBSD: uvm_amap_i.h,v 1.15 2000/11/25 06:27:59 chs Exp $ */
! 3:
! 4: /*
! 5: *
! 6: * Copyright (c) 1997 Charles D. Cranor and Washington University.
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This product includes software developed by Charles D. Cranor and
! 20: * Washington University.
! 21: * 4. The name of the author may not be used to endorse or promote products
! 22: * derived from this software without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 34: *
! 35: * from: Id: uvm_amap_i.h,v 1.1.2.4 1998/01/05 18:12:57 chuck Exp
! 36: */
! 37:
! 38: #ifndef _UVM_UVM_AMAP_I_H_
! 39: #define _UVM_UVM_AMAP_I_H_
! 40:
! 41: /*
! 42: * uvm_amap_i.h
! 43: */
! 44:
! 45: /*
! 46: * if inlines are enabled always pull in these functions, otherwise
! 47: * pull them in only once (when we are compiling uvm_amap.c).
! 48: */
! 49:
! 50: #if defined(UVM_AMAP_INLINE) || defined(UVM_AMAP_C)
! 51:
! 52: /*
! 53: * amap_lookup: look up a page in an amap
! 54: *
! 55: * => amap should be locked by caller.
! 56: */
! 57: AMAP_INLINE struct vm_anon *
! 58: amap_lookup(aref, offset)
! 59: struct vm_aref *aref;
! 60: vaddr_t offset;
! 61: {
! 62: int slot;
! 63: struct vm_amap *amap = aref->ar_amap;
! 64: UVMHIST_FUNC("amap_lookup"); UVMHIST_CALLED(maphist);
! 65:
! 66: AMAP_B2SLOT(slot, offset);
! 67: slot += aref->ar_pageoff;
! 68:
! 69: if (slot >= amap->am_nslot)
! 70: panic("amap_lookup: offset out of range");
! 71:
! 72: UVMHIST_LOG(maphist, "<- done (amap=%p, offset=0x%lx, result=%p)",
! 73: amap, offset, amap->am_anon[slot], 0);
! 74: return(amap->am_anon[slot]);
! 75: }
! 76:
! 77: /*
! 78: * amap_lookups: look up a range of pages in an amap
! 79: *
! 80: * => amap should be locked by caller.
! 81: * => XXXCDC: this interface is biased toward array-based amaps. fix.
! 82: */
! 83: AMAP_INLINE void
! 84: amap_lookups(aref, offset, anons, npages)
! 85: struct vm_aref *aref;
! 86: vaddr_t offset;
! 87: struct vm_anon **anons;
! 88: int npages;
! 89: {
! 90: int slot;
! 91: struct vm_amap *amap = aref->ar_amap;
! 92: UVMHIST_FUNC("amap_lookups"); UVMHIST_CALLED(maphist);
! 93:
! 94: AMAP_B2SLOT(slot, offset);
! 95: slot += aref->ar_pageoff;
! 96:
! 97: UVMHIST_LOG(maphist, " slot=%ld, npages=%ld, nslot=%ld", slot, npages,
! 98: amap->am_nslot, 0);
! 99:
! 100: if ((slot + (npages - 1)) >= amap->am_nslot)
! 101: panic("amap_lookups: offset out of range");
! 102:
! 103: memcpy(anons, &amap->am_anon[slot], npages * sizeof(struct vm_anon *));
! 104:
! 105: UVMHIST_LOG(maphist, "<- done", 0, 0, 0, 0);
! 106: return;
! 107: }
! 108:
! 109: /*
! 110: * amap_add: add (or replace) a page to an amap
! 111: *
! 112: * => caller must lock amap.
! 113: * => if (replace) caller must lock anon because we might have to call
! 114: * pmap_page_protect on the anon's page.
! 115: * => returns an "offset" which is meaningful to amap_unadd().
! 116: */
! 117: AMAP_INLINE void
! 118: amap_add(aref, offset, anon, replace)
! 119: struct vm_aref *aref;
! 120: vaddr_t offset;
! 121: struct vm_anon *anon;
! 122: boolean_t replace;
! 123: {
! 124: int slot;
! 125: struct vm_amap *amap = aref->ar_amap;
! 126: UVMHIST_FUNC("amap_add"); UVMHIST_CALLED(maphist);
! 127:
! 128: AMAP_B2SLOT(slot, offset);
! 129: slot += aref->ar_pageoff;
! 130:
! 131: if (slot >= amap->am_nslot)
! 132: panic("amap_add: offset out of range");
! 133:
! 134: if (replace) {
! 135:
! 136: if (amap->am_anon[slot] == NULL)
! 137: panic("amap_add: replacing null anon");
! 138: if (amap->am_anon[slot]->an_page != NULL &&
! 139: (amap->am_flags & AMAP_SHARED) != 0) {
! 140: pmap_page_protect(amap->am_anon[slot]->an_page,
! 141: VM_PROT_NONE);
! 142: /*
! 143: * XXX: suppose page is supposed to be wired somewhere?
! 144: */
! 145: }
! 146: } else { /* !replace */
! 147: if (amap->am_anon[slot] != NULL)
! 148: panic("amap_add: slot in use");
! 149:
! 150: amap->am_bckptr[slot] = amap->am_nused;
! 151: amap->am_slots[amap->am_nused] = slot;
! 152: amap->am_nused++;
! 153: }
! 154: amap->am_anon[slot] = anon;
! 155: UVMHIST_LOG(maphist,
! 156: "<- done (amap=%p, offset=0x%lx, anon=%p, rep=%ld)",
! 157: amap, offset, anon, replace);
! 158: }
! 159:
! 160: /*
! 161: * amap_unadd: remove a page from an amap
! 162: *
! 163: * => caller must lock amap
! 164: */
! 165: AMAP_INLINE void
! 166: amap_unadd(aref, offset)
! 167: struct vm_aref *aref;
! 168: vaddr_t offset;
! 169: {
! 170: int ptr, slot;
! 171: struct vm_amap *amap = aref->ar_amap;
! 172: UVMHIST_FUNC("amap_unadd"); UVMHIST_CALLED(maphist);
! 173:
! 174: AMAP_B2SLOT(slot, offset);
! 175: slot += aref->ar_pageoff;
! 176:
! 177: if (slot >= amap->am_nslot)
! 178: panic("amap_unadd: offset out of range");
! 179:
! 180: if (amap->am_anon[slot] == NULL)
! 181: panic("amap_unadd: nothing there");
! 182:
! 183: amap->am_anon[slot] = NULL;
! 184: ptr = amap->am_bckptr[slot];
! 185:
! 186: if (ptr != (amap->am_nused - 1)) { /* swap to keep slots contig? */
! 187: amap->am_slots[ptr] = amap->am_slots[amap->am_nused - 1];
! 188: amap->am_bckptr[amap->am_slots[ptr]] = ptr; /* back link */
! 189: }
! 190: amap->am_nused--;
! 191: UVMHIST_LOG(maphist, "<- done (amap=%p, slot=%ld)", amap, slot,0, 0);
! 192: }
! 193:
! 194: /*
! 195: * amap_ref: gain a reference to an amap
! 196: *
! 197: * => amap must not be locked (we will lock)
! 198: * => "offset" and "len" are in units of pages
! 199: * => called at fork time to gain the child's reference
! 200: */
! 201: AMAP_INLINE void
! 202: amap_ref(amap, offset, len, flags)
! 203: struct vm_amap *amap;
! 204: vaddr_t offset;
! 205: vsize_t len;
! 206: int flags;
! 207: {
! 208: UVMHIST_FUNC("amap_ref"); UVMHIST_CALLED(maphist);
! 209:
! 210: amap->am_ref++;
! 211: if (flags & AMAP_SHARED)
! 212: amap->am_flags |= AMAP_SHARED;
! 213: #ifdef UVM_AMAP_PPREF
! 214: if (amap->am_ppref == NULL && (flags & AMAP_REFALL) == 0 &&
! 215: len != amap->am_nslot)
! 216: amap_pp_establish(amap);
! 217: if (amap->am_ppref && amap->am_ppref != PPREF_NONE) {
! 218: if (flags & AMAP_REFALL)
! 219: amap_pp_adjref(amap, 0, amap->am_nslot, 1);
! 220: else
! 221: amap_pp_adjref(amap, offset, len, 1);
! 222: }
! 223: #endif
! 224: UVMHIST_LOG(maphist,"<- done! amap=%p", amap, 0, 0, 0);
! 225: }
! 226:
! 227: /*
! 228: * amap_unref: remove a reference to an amap
! 229: *
! 230: * => caller must remove all pmap-level references to this amap before
! 231: * dropping the reference
! 232: * => called from uvm_unmap_detach [only] ... note that entry is no
! 233: * longer part of a map and thus has no need for locking
! 234: * => amap must be unlocked (we will lock it).
! 235: */
! 236: AMAP_INLINE void
! 237: amap_unref(amap, offset, len, all)
! 238: struct vm_amap *amap;
! 239: vaddr_t offset;
! 240: vsize_t len;
! 241: boolean_t all;
! 242: {
! 243: UVMHIST_FUNC("amap_unref"); UVMHIST_CALLED(maphist);
! 244:
! 245: UVMHIST_LOG(maphist," amap=%p refs=%ld, nused=%ld",
! 246: amap, amap->am_ref, amap->am_nused, 0);
! 247:
! 248: /*
! 249: * if we are the last reference, free the amap and return.
! 250: */
! 251:
! 252: if (amap->am_ref-- == 1) {
! 253: amap_wipeout(amap); /* drops final ref and frees */
! 254: UVMHIST_LOG(maphist,"<- done (was last ref)!", 0, 0, 0, 0);
! 255: return; /* no need to unlock */
! 256: }
! 257:
! 258: /*
! 259: * otherwise just drop the reference count(s)
! 260: */
! 261: if (amap->am_ref == 1 && (amap->am_flags & AMAP_SHARED) != 0)
! 262: amap->am_flags &= ~AMAP_SHARED; /* clear shared flag */
! 263: #ifdef UVM_AMAP_PPREF
! 264: if (amap->am_ppref == NULL && all == 0 && len != amap->am_nslot)
! 265: amap_pp_establish(amap);
! 266: if (amap->am_ppref && amap->am_ppref != PPREF_NONE) {
! 267: if (all)
! 268: amap_pp_adjref(amap, 0, amap->am_nslot, -1);
! 269: else
! 270: amap_pp_adjref(amap, offset, len, -1);
! 271: }
! 272: #endif
! 273:
! 274: UVMHIST_LOG(maphist,"<- done!", 0, 0, 0, 0);
! 275: }
! 276:
! 277: #endif /* defined(UVM_AMAP_INLINE) || defined(UVM_AMAP_C) */
! 278:
! 279: #endif /* _UVM_UVM_AMAP_I_H_ */
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