/* $OpenBSD: pmap.h,v 1.25 2011/03/23 16:54:36 pirofti Exp $ */ /* * Copyright (c) 1987 Carnegie-Mellon University * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ralph Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)pmap.h 8.1 (Berkeley) 6/10/93 */ #ifndef _MIPS64_PMAP_H_ #define _MIPS64_PMAP_H_ #ifdef _KERNEL #include <machine/pte.h> /* * The user address space is currently limited to 2Gb (0x0 - 0x80000000). * * The user address space is mapped using a two level structure where * virtual address bits 30..22 are used to index into a segment table which * points to a page worth of PTEs (4096 page can hold 1024 PTEs). * Bits 21..12 are then used to index a PTE which describes a page within * a segment. * * Note: The kernel doesn't use the same data structures as user programs. * All the PTE entries are stored in a single array in Sysmap which is * dynamically allocated at boot time. */ /* * Size of second level page structs (page tables, and segment table) used * by this pmap. */ #define PMAP_L2SHIFT 12 #define PMAP_L2SIZE (1UL << PMAP_L2SHIFT) /* * Segment sizes */ /* -2 below is for log2(sizeof pt_entry_t) */ #define SEGSHIFT (PAGE_SHIFT + PMAP_L2SHIFT - 2) #define NBSEG (1UL << SEGSHIFT) #define SEGOFSET (NBSEG - 1) #define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET) #define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET) #define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)]) #define PMAP_SEGTABSIZE (PMAP_L2SIZE / sizeof(void *)) struct segtab { pt_entry_t *seg_tab[PMAP_SEGTABSIZE]; }; struct pmap_asid_info { u_int pma_asid; /* address space tag */ u_int pma_asidgen; /* TLB PID generation number */ }; /* * Machine dependent pmap structure. */ typedef struct pmap { int pm_count; /* pmap reference count */ simple_lock_data_t pm_lock; /* lock on pmap */ struct pmap_statistics pm_stats; /* pmap statistics */ struct segtab *pm_segtab; /* pointers to pages of PTEs */ struct pmap_asid_info pm_asid[1]; /* ASID information */ } *pmap_t; /* * Compute the sizeof of a pmap structure. Subtract one because one * ASID info structure is already included in the pmap structure itself. */ #define PMAP_SIZEOF(x) \ (ALIGN(sizeof(struct pmap) + \ (sizeof(struct pmap_asid_info) * ((x) - 1)))) /* flags for pv_entry */ #define PV_UNCACHED PG_PMAP0 /* Page is mapped unchached */ #define PV_CACHED PG_PMAP1 /* Page has been cached */ #define PV_ATTR_MOD PG_PMAP2 #define PV_ATTR_REF PG_PMAP3 #define PV_PRESERVE (PV_ATTR_MOD | PV_ATTR_REF) extern struct pmap *const kernel_pmap_ptr; #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) #define pmap_kernel() (kernel_pmap_ptr) #define PMAP_STEAL_MEMORY /* Enable 'stealing' during boot */ #define PMAP_PREFER(pa, va) pmap_prefer(pa, va) #define pmap_update(x) do { /* nothing */ } while (0) void pmap_bootstrap(void); int pmap_is_page_ro( pmap_t, vaddr_t, pt_entry_t); void pmap_kenter_cache(vaddr_t va, paddr_t pa, vm_prot_t prot, int cache); vaddr_t pmap_prefer(vaddr_t, vaddr_t); void pmap_set_modify(vm_page_t); void pmap_page_cache(vm_page_t, int); #define pmap_collect(x) do { /* nothing */ } while (0) #define pmap_unuse_final(p) do { /* nothing yet */ } while (0) #define pmap_remove_holes(map) do { /* nothing */ } while (0) void pmap_update_user_page(pmap_t, vaddr_t, pt_entry_t); #ifdef MULTIPROCESSOR void pmap_update_kernel_page(vaddr_t, pt_entry_t); #else #define pmap_update_kernel_page(va, entry) tlb_update(va, entry) #endif /* * Most R5000 processors (and related families) have a silicon bug preventing * the ll/sc (and lld/scd) instructions from honouring the caching mode * when accessing XKPHYS addresses. * * Since pool memory is allocated with pmap_map_direct() if __HAVE_PMAP_DIRECT, * and many structures containing fields which will be used with * <machine/atomic.h> routines are allocated from pools, __HAVE_PMAP_DIRECT can * not be defined on systems which may use flawed processors. */ #if !defined(CPU_R5000) && !defined(CPU_RM7000) #define __HAVE_PMAP_DIRECT vaddr_t pmap_map_direct(vm_page_t); vm_page_t pmap_unmap_direct(vaddr_t); #endif #endif /* _KERNEL */ #endif /* !_MIPS64_PMAP_H_ */