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Diffstat (limited to 'sys/arch/wgrisc/include/pmap.h')
| -rw-r--r-- | sys/arch/wgrisc/include/pmap.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/sys/arch/wgrisc/include/pmap.h b/sys/arch/wgrisc/include/pmap.h new file mode 100644 index 00000000000..3044047e584 --- /dev/null +++ b/sys/arch/wgrisc/include/pmap.h @@ -0,0 +1,109 @@ +/* $OpenBSD: pmap.h,v 1.1 1997/02/06 16:02:43 pefo 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 _PMAP_MACHINE_ +#define _PMAP_MACHINE_ + +/* + * The user address space is 2Gb (0x0 - 0x80000000). + * User programs are laid out in memory as follows: + * address + * USRTEXT 0x00400000 + * USRDATA 0x10000000 + * USRSTACK 0x7FFFFFFF + * + * 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. + * + * The wired entries in the TLB will contain the following: + * 0-1 (UPAGES) for curproc user struct and kernel stack. + * + * 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. + */ + +#define mips_trunc_seg(x) ((vm_offset_t)(x) & ~SEGOFSET) +#define mips_round_seg(x) (((vm_offset_t)(x) + SEGOFSET) & ~SEGOFSET) +#define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)]) + +#define PMAP_SEGTABSIZE 512 + +union pt_entry; + +struct segtab { + union pt_entry *seg_tab[PMAP_SEGTABSIZE]; +}; + +/* + * 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 */ + int pm_tlbpid; /* address space tag */ + u_int pm_tlbgen; /* TLB PID generation number */ + struct segtab *pm_segtab; /* pointers to pages of PTEs */ +} *pmap_t; + +/* + * Defines for pmap_attributes[phys_mach_page]; + */ +#define PMAP_ATTR_MOD 0x01 /* page has been modified */ +#define PMAP_ATTR_REF 0x02 /* page has been referenced */ + +#ifdef _KERNEL +extern char *pmap_attributes; /* reference and modify bits */ +extern struct pmap kernel_pmap_store; + +#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_store) + +#define PMAP_PREFER(pa, va) pmap_prefer((pa), (va)) + +#endif /* _KERNEL */ + +#endif /* _PMAP_MACHINE_ */ |