initial import of pica stuff (a few theo modifications already in here)

1 files changed, 104 insertions, 0 deletions

diff --git a/sys/arch/pica/include/pmap.h b/sys/arch/pica/include/pmap.h
new file mode 100644
index 00000000000..39c51eea199
--- /dev/null
+++ b/sys/arch/pica/include/pmap.h
@@ -0,0 +1,104 @@
+/* 
+ * 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
+ *      $Id: pmap.h,v 1.1 1995/10/18 10:39:13 deraadt Exp $
+ */
+
+#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		0x00001000
+ *	USRDATA		USRTEXT + text_size
+ *	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 pica_trunc_seg(x)	((vm_offset_t)(x) & ~SEGOFSET)
+#define pica_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_wired_count(pmap) 	((pmap)->pm_stats.wired_count)
+#define pmap_kernel() (&kernel_pmap_store)
+#endif	/* _KERNEL */
+
+#endif	/* _PMAP_MACHINE_ */