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      1 /*	$NetBSD: pmap.h,v 1.41 2022/05/26 05:34:04 skrll Exp $	*/
      2 
      3 /*	$OpenBSD: pmap.h,v 1.35 2007/12/14 18:32:23 deraadt Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 2002-2004 Michael Shalayeff
      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  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     28  * THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 /*
     32  *	Pmap header for hppa.
     33  */
     34 
     35 #ifndef	_HPPA_PMAP_H_
     36 #define	_HPPA_PMAP_H_
     37 
     38 #ifdef _KERNEL_OPT
     39 #include "opt_cputype.h"
     40 #endif
     41 
     42 #include <sys/rwlock.h>
     43 #include <machine/pte.h>
     44 #include <machine/cpufunc.h>
     45 
     46 #include <uvm/uvm_pglist.h>
     47 #include <uvm/uvm_object.h>
     48 
     49 #ifdef	_KERNEL
     50 
     51 #define PMAP_NEED_PROCWR
     52 
     53 struct pmap {
     54 	struct uvm_object pm_obj;	/* object (lck by object lock) */
     55 #define	pm_lock	pm_obj.vmobjlock
     56 	krwlock_t	pm_obj_lock;	/* lock for pm_obj */
     57 	struct vm_page	*pm_ptphint;
     58 	struct vm_page	*pm_pdir_pg;	/* vm_page for pdir */
     59 	volatile uint32_t *pm_pdir;	/* page dir (read-only after create) */
     60 	pa_space_t	pm_space;	/* space id (read-only after create) */
     61 	u_int		pm_pid;		/* prot id (read-only after create) */
     62 
     63 	struct pmap_statistics	pm_stats;
     64 };
     65 
     66 #define	PVF_MOD		PTE_PROT(TLB_DIRTY)	/* pg/mp is modified */
     67 #define	PVF_REF		PTE_PROT(TLB_REFTRAP)	/* pg/mp (inv) is referenced */
     68 #define	PVF_WRITE	PTE_PROT(TLB_WRITE)	/* pg/mp is writable */
     69 #define	PVF_EXEC	PTE_PROT(TLB_EXECUTE)	/* pg/mp is executable */
     70 #define	PVF_UNCACHEABLE	PTE_PROT(TLB_UNCACHEABLE)	/* pg/mp is uncacheable */
     71 
     72 #define	HPPA_MAX_PID	0xfffa
     73 #define	HPPA_SID_MAX	0x7ffd
     74 
     75 #define	PMAP_DIRECTMAP	0x10000000 /* kenter_pa */
     76 
     77 /*
     78  * DON'T CHANGE THIS - this is assumed in lots of places.
     79  */
     80 #define	HPPA_SID_KERNEL	0
     81 #define	HPPA_PID_KERNEL	2
     82 
     83 struct pv_entry {			/* locked by its list's pvh_lock */
     84 	struct pv_entry	*pv_next;
     85 	struct pmap	*pv_pmap;	/* the pmap */
     86 	vaddr_t		pv_va;		/* the virtual address + flags */
     87 #define	PV_VAMASK	(~(PAGE_SIZE - 1))
     88 #define	PV_KENTER	__BIT(0)
     89 
     90 	struct vm_page	*pv_ptp;	/* the vm_page of the PTP */
     91 };
     92 
     93 extern int pmap_hptsize;
     94 extern struct pdc_hwtlb pdc_hwtlb;
     95 
     96 /*
     97  * pool quickmaps
     98  */
     99 static inline vaddr_t hppa_map_poolpage(paddr_t pa)
    100 {
    101 	return (vaddr_t)pa;
    102 }
    103 
    104 static inline paddr_t hppa_unmap_poolpage(vaddr_t va)
    105 {
    106 	pdcache(HPPA_SID_KERNEL, va, PAGE_SIZE);
    107 
    108 #if defined(HP8000_CPU) || defined(HP8200_CPU) || \
    109     defined(HP8500_CPU) || defined(HP8600_CPU)
    110 	pdtlb(HPPA_SID_KERNEL, va);
    111 #endif
    112 
    113 	return (paddr_t)va;
    114 }
    115 
    116 #define	PMAP_MAP_POOLPAGE(pa)	hppa_map_poolpage(pa)
    117 #define	PMAP_UNMAP_POOLPAGE(va)	hppa_unmap_poolpage(va)
    118 
    119 /*
    120  * according to the parisc manual aliased va's should be
    121  * different by high 12 bits only.
    122  */
    123 #define	PMAP_PREFER(o,h,s,td)	pmap_prefer((o), (h), (td))
    124 
    125 static inline void
    126 pmap_prefer(vaddr_t fo, vaddr_t *va, int td)
    127 {
    128 	vaddr_t newva;
    129 
    130 	newva = (*va & HPPA_PGAMASK) | (fo & HPPA_PGAOFF);
    131 	if (td) {
    132 		if (newva > *va)
    133 			newva -= HPPA_PGALIAS;
    134 	} else {
    135 		if (newva < *va)
    136 			newva += HPPA_PGALIAS;
    137 	}
    138 	*va = newva;
    139 }
    140 
    141 #define	pmap_sid2pid(s)			(((s) + 1) << 1)
    142 #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
    143 #define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
    144 #define	pmap_update(p)
    145 
    146 #define	pmap_copy(dpmap,spmap,da,len,sa)
    147 
    148 #define	pmap_clear_modify(pg)	pmap_changebit(pg, 0, PTE_PROT(TLB_DIRTY))
    149 #define	pmap_clear_reference(pg) \
    150 				pmap_changebit(pg, PTE_PROT(TLB_REFTRAP), 0)
    151 #define	pmap_is_modified(pg)	pmap_testbit(pg, PTE_PROT(TLB_DIRTY))
    152 #define	pmap_is_referenced(pg)	pmap_testbit(pg, PTE_PROT(TLB_REFTRAP))
    153 #define	pmap_phys_address(ppn)	((ppn) << PAGE_SHIFT)
    154 
    155 void	pmap_activate(struct lwp *);
    156 
    157 void pmap_bootstrap(vaddr_t);
    158 bool pmap_changebit(struct vm_page *, u_int, u_int);
    159 bool pmap_testbit(struct vm_page *, u_int);
    160 void pmap_write_protect(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
    161 void pmap_remove(struct pmap *pmap, vaddr_t sva, vaddr_t eva);
    162 void pmap_page_remove(struct vm_page *pg);
    163 
    164 void pmap_procwr(struct proc *, vaddr_t, size_t);
    165 
    166 static inline void
    167 pmap_deactivate(struct lwp *l)
    168 {
    169 	/* Nothing. */
    170 }
    171 
    172 static inline bool
    173 pmap_remove_all(struct pmap *pmap)
    174 {
    175 	/* Nothing. */
    176 	return false;
    177 }
    178 
    179 static inline int
    180 pmap_prot(struct pmap *pmap, int prot)
    181 {
    182 	extern u_int hppa_prot[];
    183 	return (hppa_prot[prot] | (pmap == pmap_kernel() ? 0 : TLB_USER));
    184 }
    185 
    186 static inline void
    187 pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
    188 {
    189 	if ((prot & UVM_PROT_WRITE) == 0) {
    190 		if (prot & (UVM_PROT_RX))
    191 			pmap_changebit(pg, 0, PTE_PROT(TLB_WRITE));
    192 		else
    193 			pmap_page_remove(pg);
    194 	}
    195 }
    196 
    197 static inline void
    198 pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
    199 {
    200 	if ((prot & UVM_PROT_WRITE) == 0) {
    201 		if (prot & (UVM_PROT_RX))
    202 			pmap_write_protect(pmap, sva, eva, prot);
    203 		else
    204 			pmap_remove(pmap, sva, eva);
    205 	}
    206 }
    207 
    208 #define	pmap_sid(pmap, va) \
    209 	((((va) & 0xc0000000) != 0xc0000000) ? \
    210 	 (pmap)->pm_space : HPPA_SID_KERNEL)
    211 
    212 #define __HAVE_VM_PAGE_MD
    213 
    214 struct pv_entry;
    215 
    216 struct vm_page_md {
    217 	struct pv_entry	*pvh_list;	/* head of list */
    218 	u_int		pvh_attrs;	/* to preserve ref/mod */
    219 };
    220 
    221 #define	VM_MDPAGE_INIT(pg) \
    222 do {									\
    223 	(pg)->mdpage.pvh_list = NULL;					\
    224 	(pg)->mdpage.pvh_attrs = 0;					\
    225 } while (0)
    226 
    227 #endif /* _KERNEL */
    228 
    229 #endif /* _HPPA_PMAP_H_ */
    230