Annotation of sys/arch/mips64/include/pmap.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: pmap.h,v 1.12 2007/04/27 18:14:11 miod Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1987 Carnegie-Mellon University
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to Berkeley by
! 9: * Ralph Campbell.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * from: @(#)pmap.h 8.1 (Berkeley) 6/10/93
! 36: */
! 37:
! 38: #ifndef _MIPS_PMAP_H_
! 39: #define _MIPS_PMAP_H_
! 40:
! 41: #ifdef _KERNEL
! 42:
! 43: /*
! 44: * The user address space is 2Gb (0x0 - 0x80000000).
! 45: * User programs are laid out in memory as follows:
! 46: * address
! 47: * USRTEXT 0x00400000
! 48: * USRDATA 0x10000000
! 49: * USRSTACK 0x7FFFFFFF
! 50: *
! 51: * The user address space is mapped using a two level structure where
! 52: * virtual address bits 30..22 are used to index into a segment table which
! 53: * points to a page worth of PTEs (4096 page can hold 1024 PTEs).
! 54: * Bits 21..12 are then used to index a PTE which describes a page within
! 55: * a segment.
! 56: *
! 57: * The wired entries in the TLB will contain the following:
! 58: * 0-1 (UPAGES) for curproc user struct and kernel stack.
! 59: *
! 60: * Note: The kernel doesn't use the same data structures as user programs.
! 61: * All the PTE entries are stored in a single array in Sysmap which is
! 62: * dynamically allocated at boot time.
! 63: */
! 64:
! 65: #define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET)
! 66: #define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET)
! 67: #define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)])
! 68:
! 69: #define PMAP_SEGTABSIZE 512
! 70:
! 71: union pt_entry;
! 72:
! 73: struct segtab {
! 74: union pt_entry *seg_tab[PMAP_SEGTABSIZE];
! 75: };
! 76:
! 77: /*
! 78: * Machine dependent pmap structure.
! 79: */
! 80: typedef struct pmap {
! 81: int pm_count; /* pmap reference count */
! 82: simple_lock_data_t pm_lock; /* lock on pmap */
! 83: struct pmap_statistics pm_stats; /* pmap statistics */
! 84: int pm_tlbpid; /* address space tag */
! 85: u_int pm_tlbgen; /* TLB PID generation number */
! 86: struct segtab *pm_segtab; /* pointers to pages of PTEs */
! 87: } *pmap_t;
! 88:
! 89:
! 90: /* flags for pv_entry */
! 91: #define PV_UNCACHED PG_PMAP0 /* Page is mapped unchached */
! 92: #define PV_CACHED PG_PMAP1 /* Page has been cached */
! 93: #define PV_ATTR_MOD PG_PMAP2
! 94: #define PV_ATTR_REF PG_PMAP3
! 95: #define PV_PRESERVE (PV_ATTR_MOD | PV_ATTR_REF)
! 96:
! 97: extern struct pmap kernel_pmap_store;
! 98:
! 99: #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
! 100: #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
! 101: #define pmap_kernel() (&kernel_pmap_store)
! 102: #define pmap_phys_address(ppn) ptoa(ppn)
! 103:
! 104: #define PMAP_STEAL_MEMORY /* Enable 'stealing' during boot */
! 105:
! 106: #define PMAP_PREFER(pa, va) pmap_prefer(pa, va)
! 107:
! 108: #define pmap_update(x) do { /* nothing */ } while (0)
! 109:
! 110: void pmap_bootstrap(void);
! 111: int pmap_is_page_ro( pmap_t, vaddr_t, int);
! 112: void pmap_kenter_cache(vaddr_t va, paddr_t pa, vm_prot_t prot, int cache);
! 113: void pmap_prefer(vaddr_t, vaddr_t *);
! 114: void pmap_set_modify(vm_page_t);
! 115: void pmap_page_cache(vm_page_t, int);
! 116:
! 117: #define pmap_collect(x) do { /* nothing */ } while (0)
! 118: #define pmap_proc_iflush(p,va,len) do { /* nothing yet (handled in trap now) */ } while (0)
! 119: #define pmap_unuse_final(p) do { /* nothing yet */ } while (0)
! 120:
! 121: #endif /* _KERNEL */
! 122:
! 123: #endif /* !_MIPS_PMAP_H_ */
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