/*      $NetBSD: pmap.h,v 1.134 2022/08/20 23:49:31 riastradh Exp $     */

/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

/*
* Copyright (c) 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
*      Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
*    or promote products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/

/*
* pmap.h: see pmap.c for the history of this pmap module.
*/

#ifndef _X86_PMAP_H_
#define _X86_PMAP_H_

#if defined(_KERNEL)
#include <x86/pmap_pv.h>
#include <uvm/pmap/pmap_pvt.h>

/*
* MD flags that we use for pmap_enter and pmap_kenter_pa:
*/

/*
* macros
*/

#define pmap_clear_modify(pg)           pmap_clear_attrs(pg, PP_ATTRS_D)
#define pmap_clear_reference(pg)        pmap_clear_attrs(pg, PP_ATTRS_A)
#define pmap_copy(DP,SP,D,L,S)          __USE(L)
#define pmap_is_modified(pg)            pmap_test_attrs(pg, PP_ATTRS_D)
#define pmap_is_referenced(pg)          pmap_test_attrs(pg, PP_ATTRS_A)
#define pmap_move(DP,SP,D,L,S)
#define pmap_phys_address(ppn)          (x86_ptob(ppn) & ~X86_MMAP_FLAG_MASK)
#define pmap_mmap_flags(ppn)            x86_mmap_flags(ppn)

#if defined(__x86_64__) || defined(PAE)
#define X86_MMAP_FLAG_SHIFT     (64 - PGSHIFT)
#else
#define X86_MMAP_FLAG_SHIFT     (32 - PGSHIFT)
#endif

#define X86_MMAP_FLAG_MASK      0xf
#define X86_MMAP_FLAG_PREFETCH  0x1

/*
* prototypes
*/

void            pmap_activate(struct lwp *);
void            pmap_bootstrap(vaddr_t);
bool            pmap_clear_attrs(struct vm_page *, unsigned);
bool            pmap_pv_clear_attrs(paddr_t, unsigned);
void            pmap_deactivate(struct lwp *);
void            pmap_page_remove(struct vm_page *);
void            pmap_pv_remove(paddr_t);
void            pmap_remove(struct pmap *, vaddr_t, vaddr_t);
bool            pmap_test_attrs(struct vm_page *, unsigned);
void            pmap_write_protect(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
void            pmap_load(void);
paddr_t         pmap_init_tmp_pgtbl(paddr_t);
bool            pmap_remove_all(struct pmap *);
void            pmap_ldt_cleanup(struct lwp *);
void            pmap_ldt_sync(struct pmap *);
void            pmap_kremove_local(vaddr_t, vsize_t);

#define __HAVE_PMAP_PV_TRACK    1
void            pmap_pv_init(void);
void            pmap_pv_track(paddr_t, psize_t);
void            pmap_pv_untrack(paddr_t, psize_t);

u_int           x86_mmap_flags(paddr_t);

#define PMAP_GROWKERNEL         /* turn on pmap_growkernel interface */
#define PMAP_FORK               /* turn on pmap_fork interface */

/*
* inline functions
*/

/*
* pmap_page_protect: change the protection of all recorded mappings
*      of a managed page
*
* => this function is a frontend for pmap_page_remove/pmap_clear_attrs
* => we only have to worry about making the page more protected.
*      unprotecting a page is done on-demand at fault time.
*/

__inline static void __unused
pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
{
       if ((prot & VM_PROT_WRITE) == 0) {
               if (prot & (VM_PROT_READ|VM_PROT_EXECUTE)) {
                       (void)pmap_clear_attrs(pg, PP_ATTRS_W);
               } else {
                       pmap_page_remove(pg);
               }
       }
}

/*
* pmap_pv_protect: change the protection of all recorded mappings
*      of an unmanaged page
*/

__inline static void __unused
pmap_pv_protect(paddr_t pa, vm_prot_t prot)
{
       if ((prot & VM_PROT_WRITE) == 0) {
               if (prot & (VM_PROT_READ|VM_PROT_EXECUTE)) {
                       (void)pmap_pv_clear_attrs(pa, PP_ATTRS_W);
               } else {
                       pmap_pv_remove(pa);
               }
       }
}

/*
* pmap_protect: change the protection of pages in a pmap
*
* => this function is a frontend for pmap_remove/pmap_write_protect
* => we only have to worry about making the page more protected.
*      unprotecting a page is done on-demand at fault time.
*/

__inline static void __unused
pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
{
       if ((prot & VM_PROT_WRITE) == 0) {
               if (prot & (VM_PROT_READ|VM_PROT_EXECUTE)) {
                       pmap_write_protect(pmap, sva, eva, prot);
               } else {
                       pmap_remove(pmap, sva, eva);
               }
       }
}

paddr_t vtophys(vaddr_t);
vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, vm_prot_t);
void    pmap_cpu_init_late(struct cpu_info *);

/* pmap functions with machine addresses */
void    pmap_kenter_ma(vaddr_t, paddr_t, vm_prot_t, u_int);
int     pmap_enter_ma(struct pmap *, vaddr_t, paddr_t, paddr_t,
           vm_prot_t, u_int, int);
bool    pmap_extract_ma(pmap_t, vaddr_t, paddr_t *);

paddr_t pmap_get_physpage(void);

/*
* Hooks for the pool allocator.
*/
#define POOL_VTOPHYS(va)        vtophys((vaddr_t) (va))

#ifdef __HAVE_DIRECT_MAP

extern vaddr_t pmap_direct_base;
extern vaddr_t pmap_direct_end;

#define PMAP_DIRECT_BASE        pmap_direct_base
#define PMAP_DIRECT_END         pmap_direct_end

#define PMAP_DIRECT_MAP(pa)     ((vaddr_t)PMAP_DIRECT_BASE + (pa))
#define PMAP_DIRECT_UNMAP(va)   ((paddr_t)(va) - PMAP_DIRECT_BASE)

/*
* Alternate mapping hooks for pool pages.
*/
#define PMAP_MAP_POOLPAGE(pa)   PMAP_DIRECT_MAP((pa))
#define PMAP_UNMAP_POOLPAGE(va) PMAP_DIRECT_UNMAP((va))

#endif /* __HAVE_DIRECT_MAP */

#define __HAVE_VM_PAGE_MD
#define VM_MDPAGE_INIT(pg) \
       memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage)); \
       PMAP_PAGE_INIT(&(pg)->mdpage.mp_pp)

struct vm_page_md {
       struct pmap_page mp_pp;
};

#endif /* _KERNEL */

#endif /* _X86_PMAP_H_ */

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