FreeBSD/Linux Kernel Cross Reference
sys/arm/include/pmap.h

     /*-
      * Copyright (c) 1991 Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * the Systems Programming Group of the University of Utah Computer
      * Science Department and William Jolitz of UUNET Technologies 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 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.
     *
     * Derived from hp300 version by Mike Hibler, this version by William
     * Jolitz uses a recursive map [a pde points to the page directory] to
     * map the page tables using the pagetables themselves. This is done to
     * reduce the impact on kernel virtual memory for lots of sparse address
     * space, and to reduce the cost of memory to each process.
     *
     *      from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
     *      from: @(#)pmap.h        7.4 (Berkeley) 5/12/91
     *      from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PMAP_H_
    #define _MACHINE_PMAP_H_
    
    #include <machine/pte.h>
    #include <machine/cpuconf.h>
    /*
     * Pte related macros
     */
    #define PTE_NOCACHE     0
    #define PTE_CACHE       1
    #define PTE_PAGETABLE   2
     
    #ifndef LOCORE
    
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    #define PDESIZE         sizeof(pd_entry_t)      /* for assembly files */
    #define PTESIZE         sizeof(pt_entry_t)      /* for assembly files */
    
    #ifdef _KERNEL
    
    #define vtophys(va)     pmap_extract(pmap_kernel(), (vm_offset_t)(va))
    #define pmap_kextract(va)       pmap_extract(pmap_kernel(), (vm_offset_t)(va))
    
    #endif
    
    #define pmap_page_get_memattr(m)        VM_MEMATTR_DEFAULT
    #define pmap_page_is_mapped(m)  (!TAILQ_EMPTY(&(m)->md.pv_list))
    #define pmap_page_set_memattr(m, ma)    (void)0
    
    /*
     * Pmap stuff
     */
    
    /*
     * This structure is used to hold a virtual<->physical address
     * association and is used mostly by bootstrap code
     */
    struct pv_addr {
            SLIST_ENTRY(pv_addr) pv_list;
            vm_offset_t     pv_va;
            vm_paddr_t      pv_pa;
    };
    
    struct  pv_entry;
    
    struct  md_page {
            int pvh_attrs;
           u_int uro_mappings;
           u_int urw_mappings;
           union {
                   u_short s_mappings[2]; /* Assume kernel count <= 65535 */
                   u_int i_mappings;
           } k_u;
   #define kro_mappings    k_u.s_mappings[0]
   #define krw_mappings    k_u.s_mappings[1]
   #define k_mappings      k_u.i_mappings
           int                     pv_list_count;
           TAILQ_HEAD(,pv_entry)   pv_list;
   };
   
   #define VM_MDPAGE_INIT(pg)                                              \
   do {                                                                    \
           TAILQ_INIT(&pg->pv_list);                                       \
           mtx_init(&(pg)->md_page.pvh_mtx, "MDPAGE Mutex", NULL, MTX_DEV);\
           (pg)->mdpage.pvh_attrs = 0;                                     \
           (pg)->mdpage.uro_mappings = 0;                                  \
           (pg)->mdpage.urw_mappings = 0;                                  \
           (pg)->mdpage.k_mappings = 0;                                    \
   } while (/*CONSTCOND*/0)
   
   struct l1_ttable;
   struct l2_dtable;
   
   
   /*
    * The number of L2 descriptor tables which can be tracked by an l2_dtable.
    * A bucket size of 16 provides for 16MB of contiguous virtual address
    * space per l2_dtable. Most processes will, therefore, require only two or
    * three of these to map their whole working set.
    */
   #define L2_BUCKET_LOG2  4
   #define L2_BUCKET_SIZE  (1 << L2_BUCKET_LOG2)
   /*
    * Given the above "L2-descriptors-per-l2_dtable" constant, the number
    * of l2_dtable structures required to track all possible page descriptors
    * mappable by an L1 translation table is given by the following constants:
    */
   #define L2_LOG2         ((32 - L1_S_SHIFT) - L2_BUCKET_LOG2)
   #define L2_SIZE         (1 << L2_LOG2)
   
   struct  pmap {
           struct mtx              pm_mtx;
           u_int8_t                pm_domain;
           struct l1_ttable        *pm_l1;
           struct l2_dtable        *pm_l2[L2_SIZE];
           pd_entry_t              *pm_pdir;       /* KVA of page directory */
           int                     pm_count;       /* reference count */
           int                     pm_active;      /* active on cpus */
           struct pmap_statistics  pm_stats;       /* pmap statictics */
           TAILQ_HEAD(,pv_entry)   pm_pvlist;      /* list of mappings in pmap */
   };
   
   typedef struct pmap *pmap_t;
   
   #ifdef _KERNEL
   extern pmap_t   kernel_pmap;
   #define pmap_kernel() kernel_pmap
   
   #define PMAP_ASSERT_LOCKED(pmap) \
                                   mtx_assert(&(pmap)->pm_mtx, MA_OWNED)
   #define PMAP_LOCK(pmap)         mtx_lock(&(pmap)->pm_mtx)
   #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
   #define PMAP_LOCK_INIT(pmap)    mtx_init(&(pmap)->pm_mtx, "pmap", \
                                       NULL, MTX_DEF | MTX_DUPOK)
   #define PMAP_OWNED(pmap)        mtx_owned(&(pmap)->pm_mtx)
   #define PMAP_MTX(pmap)          (&(pmap)->pm_mtx)
   #define PMAP_TRYLOCK(pmap)      mtx_trylock(&(pmap)->pm_mtx)
   #define PMAP_UNLOCK(pmap)       mtx_unlock(&(pmap)->pm_mtx)
   #endif
   
   
   /*
    * For each vm_page_t, there is a list of all currently valid virtual
    * mappings of that page.  An entry is a pv_entry_t, the list is pv_list.
    */
   typedef struct pv_entry {
           pmap_t          pv_pmap;        /* pmap where mapping lies */
           vm_offset_t     pv_va;          /* virtual address for mapping */
           TAILQ_ENTRY(pv_entry)   pv_list;
           TAILQ_ENTRY(pv_entry)   pv_plist;
           int             pv_flags;       /* flags (wired, etc...) */
   } *pv_entry_t;
   
   #define PV_ENTRY_NULL   ((pv_entry_t) 0)
   
   #ifdef _KERNEL
   
   boolean_t pmap_get_pde_pte(pmap_t, vm_offset_t, pd_entry_t **, pt_entry_t **);
   
   /*
    * virtual address to page table entry and
    * to physical address. Likewise for alternate address space.
    * Note: these work recursively, thus vtopte of a pte will give
    * the corresponding pde that in turn maps it.
    */
   
   /*
    * The current top of kernel VM.
    */
   extern vm_offset_t pmap_curmaxkvaddr;
   
   struct pcb;
   
   void    pmap_set_pcb_pagedir(pmap_t, struct pcb *);
   /* Virtual address to page table entry */
   static __inline pt_entry_t *
   vtopte(vm_offset_t va)
   {
           pd_entry_t *pdep;
           pt_entry_t *ptep;
   
           if (pmap_get_pde_pte(pmap_kernel(), va, &pdep, &ptep) == FALSE)
                   return (NULL);
           return (ptep);
   }
   
   extern vm_offset_t phys_avail[];
   extern vm_offset_t virtual_avail;
   extern vm_offset_t virtual_end;
   
   void    pmap_bootstrap(vm_offset_t, vm_offset_t, struct pv_addr *);
   void    pmap_kenter(vm_offset_t va, vm_paddr_t pa);
   void    pmap_kenter_nocache(vm_offset_t va, vm_paddr_t pa);
   void    pmap_kenter_user(vm_offset_t va, vm_paddr_t pa);
   void    pmap_kremove(vm_offset_t);
   void    *pmap_mapdev(vm_offset_t, vm_size_t);
   void    pmap_unmapdev(vm_offset_t, vm_size_t);
   vm_page_t       pmap_use_pt(pmap_t, vm_offset_t);
   void    pmap_debug(int);
   void    pmap_map_section(vm_offset_t, vm_offset_t, vm_offset_t, int, int);
   void    pmap_link_l2pt(vm_offset_t, vm_offset_t, struct pv_addr *);
   vm_size_t       pmap_map_chunk(vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t, int, int);
   void
   pmap_map_entry(vm_offset_t l1pt, vm_offset_t va, vm_offset_t pa, int prot,
       int cache);
   int pmap_fault_fixup(pmap_t, vm_offset_t, vm_prot_t, int);
   
   /*
    * Definitions for MMU domains
    */
   #define PMAP_DOMAINS            15      /* 15 'user' domains (1-15) */
   #define PMAP_DOMAIN_KERNEL      0       /* The kernel uses domain #0 */
   
   /*
    * The new pmap ensures that page-tables are always mapping Write-Thru.
    * Thus, on some platforms we can run fast and loose and avoid syncing PTEs
    * on every change.
    *
    * Unfortunately, not all CPUs have a write-through cache mode.  So we
    * define PMAP_NEEDS_PTE_SYNC for C code to conditionally do PTE syncs,
    * and if there is the chance for PTE syncs to be needed, we define
    * PMAP_INCLUDE_PTE_SYNC so e.g. assembly code can include (and run)
    * the code.
    */
   extern int pmap_needs_pte_sync;
   
   /*
    * These macros define the various bit masks in the PTE.
    *
    * We use these macros since we use different bits on different processor
    * models.
    */
   #define L1_S_PROT_U             (L1_S_AP(AP_U))
   #define L1_S_PROT_W             (L1_S_AP(AP_W))
   #define L1_S_PROT_MASK          (L1_S_PROT_U|L1_S_PROT_W)
   
   #define L1_S_CACHE_MASK_generic (L1_S_B|L1_S_C)
   #define L1_S_CACHE_MASK_xscale  (L1_S_B|L1_S_C|L1_S_XSCALE_TEX(TEX_XSCALE_X)|\
                                   L1_S_XSCALE_TEX(TEX_XSCALE_T))
   
   #define L2_L_PROT_U             (L2_AP(AP_U))
   #define L2_L_PROT_W             (L2_AP(AP_W))
   #define L2_L_PROT_MASK          (L2_L_PROT_U|L2_L_PROT_W)
   
   #define L2_L_CACHE_MASK_generic (L2_B|L2_C)
   #define L2_L_CACHE_MASK_xscale  (L2_B|L2_C|L2_XSCALE_L_TEX(TEX_XSCALE_X) | \
                                   L2_XSCALE_L_TEX(TEX_XSCALE_T))
   
   #define L2_S_PROT_U_generic     (L2_AP(AP_U))
   #define L2_S_PROT_W_generic     (L2_AP(AP_W))
   #define L2_S_PROT_MASK_generic  (L2_S_PROT_U|L2_S_PROT_W)
   
   #define L2_S_PROT_U_xscale      (L2_AP0(AP_U))
   #define L2_S_PROT_W_xscale      (L2_AP0(AP_W))
   #define L2_S_PROT_MASK_xscale   (L2_S_PROT_U|L2_S_PROT_W)
   
   #define L2_S_CACHE_MASK_generic (L2_B|L2_C)
   #define L2_S_CACHE_MASK_xscale  (L2_B|L2_C|L2_XSCALE_T_TEX(TEX_XSCALE_X)| \
                                    L2_XSCALE_T_TEX(TEX_XSCALE_X))
   
   #define L1_S_PROTO_generic      (L1_TYPE_S | L1_S_IMP)
   #define L1_S_PROTO_xscale       (L1_TYPE_S)
   
   #define L1_C_PROTO_generic      (L1_TYPE_C | L1_C_IMP2)
   #define L1_C_PROTO_xscale       (L1_TYPE_C)
   
   #define L2_L_PROTO              (L2_TYPE_L)
   
   #define L2_S_PROTO_generic      (L2_TYPE_S)
   #define L2_S_PROTO_xscale       (L2_TYPE_XSCALE_XS)
   
   /*
    * User-visible names for the ones that vary with MMU class.
    */
   
   #if ARM_NMMUS > 1
   /* More than one MMU class configured; use variables. */
   #define L2_S_PROT_U             pte_l2_s_prot_u
   #define L2_S_PROT_W             pte_l2_s_prot_w
   #define L2_S_PROT_MASK          pte_l2_s_prot_mask
   
   #define L1_S_CACHE_MASK         pte_l1_s_cache_mask
   #define L2_L_CACHE_MASK         pte_l2_l_cache_mask
   #define L2_S_CACHE_MASK         pte_l2_s_cache_mask
   
   #define L1_S_PROTO              pte_l1_s_proto
   #define L1_C_PROTO              pte_l1_c_proto
   #define L2_S_PROTO              pte_l2_s_proto
   
   #elif (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0
   #define L2_S_PROT_U             L2_S_PROT_U_generic
   #define L2_S_PROT_W             L2_S_PROT_W_generic
   #define L2_S_PROT_MASK          L2_S_PROT_MASK_generic
   
   #define L1_S_CACHE_MASK         L1_S_CACHE_MASK_generic
   #define L2_L_CACHE_MASK         L2_L_CACHE_MASK_generic
   #define L2_S_CACHE_MASK         L2_S_CACHE_MASK_generic
   
   #define L1_S_PROTO              L1_S_PROTO_generic
   #define L1_C_PROTO              L1_C_PROTO_generic
   #define L2_S_PROTO              L2_S_PROTO_generic
   
   #elif ARM_MMU_XSCALE == 1
   #define L2_S_PROT_U             L2_S_PROT_U_xscale
   #define L2_S_PROT_W             L2_S_PROT_W_xscale
   #define L2_S_PROT_MASK          L2_S_PROT_MASK_xscale
   
   #define L1_S_CACHE_MASK         L1_S_CACHE_MASK_xscale
   #define L2_L_CACHE_MASK         L2_L_CACHE_MASK_xscale
   #define L2_S_CACHE_MASK         L2_S_CACHE_MASK_xscale
   
   #define L1_S_PROTO              L1_S_PROTO_xscale
   #define L1_C_PROTO              L1_C_PROTO_xscale
   #define L2_S_PROTO              L2_S_PROTO_xscale
   
   #endif /* ARM_NMMUS > 1 */
   
   #ifdef SKYEYE_WORKAROUNDS
   #define PMAP_NEEDS_PTE_SYNC     1
   #define PMAP_INCLUDE_PTE_SYNC
   #else
   #if (ARM_MMU_SA1 == 1) && (ARM_NMMUS == 1)
   #define PMAP_NEEDS_PTE_SYNC     1
   #define PMAP_INCLUDE_PTE_SYNC
   #elif defined(CPU_XSCALE_81342)
   #define PMAP_NEEDS_PTE_SYNC     1
   #define PMAP_INCLUDE_PTE_SYNC
   #elif (ARM_MMU_SA1 == 0)
   #define PMAP_NEEDS_PTE_SYNC     0
   #endif
   #endif
   
   /*
    * These macros return various bits based on kernel/user and protection.
    * Note that the compiler will usually fold these at compile time.
    */
   #define L1_S_PROT(ku, pr)       ((((ku) == PTE_USER) ? L1_S_PROT_U : 0) | \
                                    (((pr) & VM_PROT_WRITE) ? L1_S_PROT_W : 0))
   
   #define L2_L_PROT(ku, pr)       ((((ku) == PTE_USER) ? L2_L_PROT_U : 0) | \
                                    (((pr) & VM_PROT_WRITE) ? L2_L_PROT_W : 0))
   
   #define L2_S_PROT(ku, pr)       ((((ku) == PTE_USER) ? L2_S_PROT_U : 0) | \
                                    (((pr) & VM_PROT_WRITE) ? L2_S_PROT_W : 0))
   
   /*
    * Macros to test if a mapping is mappable with an L1 Section mapping
    * or an L2 Large Page mapping.
    */
   #define L1_S_MAPPABLE_P(va, pa, size)                                   \
           ((((va) | (pa)) & L1_S_OFFSET) == 0 && (size) >= L1_S_SIZE)
   
   #define L2_L_MAPPABLE_P(va, pa, size)                                   \
           ((((va) | (pa)) & L2_L_OFFSET) == 0 && (size) >= L2_L_SIZE)
   
   /*
    * Provide a fallback in case we were not able to determine it at
    * compile-time.
    */
   #ifndef PMAP_NEEDS_PTE_SYNC
   #define PMAP_NEEDS_PTE_SYNC     pmap_needs_pte_sync
   #define PMAP_INCLUDE_PTE_SYNC
   #endif
   
   #define PTE_SYNC(pte)                                                   \
   do {                                                                    \
           if (PMAP_NEEDS_PTE_SYNC) {                                      \
                   cpu_dcache_wb_range((vm_offset_t)(pte), sizeof(pt_entry_t));\
                   cpu_l2cache_wb_range((vm_offset_t)(pte), sizeof(pt_entry_t));\
           }\
   } while (/*CONSTCOND*/0)
   
   #define PTE_SYNC_RANGE(pte, cnt)                                        \
   do {                                                                    \
           if (PMAP_NEEDS_PTE_SYNC) {                                      \
                   cpu_dcache_wb_range((vm_offset_t)(pte),                 \
                       (cnt) << 2); /* * sizeof(pt_entry_t) */             \
                   cpu_l2cache_wb_range((vm_offset_t)(pte),                \
                       (cnt) << 2); /* * sizeof(pt_entry_t) */             \
           }                                                               \
   } while (/*CONSTCOND*/0)
   
   extern pt_entry_t               pte_l1_s_cache_mode;
   extern pt_entry_t               pte_l1_s_cache_mask;
   
   extern pt_entry_t               pte_l2_l_cache_mode;
   extern pt_entry_t               pte_l2_l_cache_mask;
   
   extern pt_entry_t               pte_l2_s_cache_mode;
   extern pt_entry_t               pte_l2_s_cache_mask;
   
   extern pt_entry_t               pte_l1_s_cache_mode_pt;
   extern pt_entry_t               pte_l2_l_cache_mode_pt;
   extern pt_entry_t               pte_l2_s_cache_mode_pt;
   
   extern pt_entry_t               pte_l2_s_prot_u;
   extern pt_entry_t               pte_l2_s_prot_w;
   extern pt_entry_t               pte_l2_s_prot_mask;
    
   extern pt_entry_t               pte_l1_s_proto;
   extern pt_entry_t               pte_l1_c_proto;
   extern pt_entry_t               pte_l2_s_proto;
   
   extern void (*pmap_copy_page_func)(vm_paddr_t, vm_paddr_t);
   extern void (*pmap_zero_page_func)(vm_paddr_t, int, int);
   
   #if (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0 || defined(CPU_XSCALE_81342)
   void    pmap_copy_page_generic(vm_paddr_t, vm_paddr_t);
   void    pmap_zero_page_generic(vm_paddr_t, int, int);
   
   void    pmap_pte_init_generic(void);
   #if defined(CPU_ARM8)
   void    pmap_pte_init_arm8(void);
   #endif
   #if defined(CPU_ARM9)
   void    pmap_pte_init_arm9(void);
   #endif /* CPU_ARM9 */
   #if defined(CPU_ARM10)
   void    pmap_pte_init_arm10(void);
   #endif /* CPU_ARM10 */
   #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1) != 0 */
   
   #if /* ARM_MMU_SA1 == */1
   void    pmap_pte_init_sa1(void);
   #endif /* ARM_MMU_SA1 == 1 */
   
   #if ARM_MMU_XSCALE == 1
   void    pmap_copy_page_xscale(vm_paddr_t, vm_paddr_t);
   void    pmap_zero_page_xscale(vm_paddr_t, int, int);
   
   void    pmap_pte_init_xscale(void);
   
   void    xscale_setup_minidata(vm_offset_t, vm_offset_t, vm_offset_t);
   
   void    pmap_use_minicache(vm_offset_t, vm_size_t);
   #endif /* ARM_MMU_XSCALE == 1 */
   #if defined(CPU_XSCALE_81342)
   #define ARM_HAVE_SUPERSECTIONS
   #endif
   
   #define PTE_KERNEL      0
   #define PTE_USER        1
   #define l1pte_valid(pde)        ((pde) != 0)
   #define l1pte_section_p(pde)    (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
   #define l1pte_page_p(pde)       (((pde) & L1_TYPE_MASK) == L1_TYPE_C)
   #define l1pte_fpage_p(pde)      (((pde) & L1_TYPE_MASK) == L1_TYPE_F)
   
   #define l2pte_index(v)          (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
   #define l2pte_valid(pte)        ((pte) != 0)
   #define l2pte_pa(pte)           ((pte) & L2_S_FRAME)
   #define l2pte_minidata(pte)     (((pte) & \
                                    (L2_B | L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X)))\
                                    == (L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X)))
   
   /* L1 and L2 page table macros */
   #define pmap_pde_v(pde)         l1pte_valid(*(pde))
   #define pmap_pde_section(pde)   l1pte_section_p(*(pde))
   #define pmap_pde_page(pde)      l1pte_page_p(*(pde))
   #define pmap_pde_fpage(pde)     l1pte_fpage_p(*(pde))
   
   #define pmap_pte_v(pte)         l2pte_valid(*(pte))
   #define pmap_pte_pa(pte)        l2pte_pa(*(pte))
   
   /*
    * Flags that indicate attributes of pages or mappings of pages.
    *
    * The PVF_MOD and PVF_REF flags are stored in the mdpage for each
    * page.  PVF_WIRED, PVF_WRITE, and PVF_NC are kept in individual
    * pv_entry's for each page.  They live in the same "namespace" so
    * that we can clear multiple attributes at a time.
    *
    * Note the "non-cacheable" flag generally means the page has
    * multiple mappings in a given address space.
    */
   #define PVF_MOD         0x01            /* page is modified */
   #define PVF_REF         0x02            /* page is referenced */
   #define PVF_WIRED       0x04            /* mapping is wired */
   #define PVF_WRITE       0x08            /* mapping is writable */
   #define PVF_EXEC        0x10            /* mapping is executable */
   #define PVF_UNC         0x20            /* mapping is 'user' non-cacheable */
   #define PVF_KNC         0x40            /* mapping is 'kernel' non-cacheable */
   #define PVF_NC          (PVF_UNC|PVF_KNC)
   
   void vector_page_setprot(int);
   
   void pmap_update(pmap_t);
   
   /*
    * This structure is used by machine-dependent code to describe
    * static mappings of devices, created at bootstrap time.
    */
   struct pmap_devmap {
           vm_offset_t     pd_va;          /* virtual address */
           vm_paddr_t      pd_pa;          /* physical address */
           vm_size_t       pd_size;        /* size of region */
           vm_prot_t       pd_prot;        /* protection code */
           int             pd_cache;       /* cache attributes */
   };
   
   const struct pmap_devmap *pmap_devmap_find_pa(vm_paddr_t, vm_size_t);
   const struct pmap_devmap *pmap_devmap_find_va(vm_offset_t, vm_size_t);
   
   void    pmap_devmap_bootstrap(vm_offset_t, const struct pmap_devmap *);
   void    pmap_devmap_register(const struct pmap_devmap *);
   
   #define SECTION_CACHE   0x1
   #define SECTION_PT      0x2
   void    pmap_kenter_section(vm_offset_t, vm_paddr_t, int flags);
   #ifdef ARM_HAVE_SUPERSECTIONS
   void    pmap_kenter_supersection(vm_offset_t, uint64_t, int flags);
   #endif
   
   extern char *_tmppt;
   
   void    pmap_postinit(void);
   
   #ifdef ARM_USE_SMALL_ALLOC
   void    arm_add_smallalloc_pages(void *, void *, int, int);
   vm_offset_t arm_ptovirt(vm_paddr_t);
   void arm_init_smallalloc(void);
   struct arm_small_page {
           void *addr;
           TAILQ_ENTRY(arm_small_page) pg_list;
   };
   
   #endif
   
   #define ARM_NOCACHE_KVA_SIZE 0x1000000
   extern vm_offset_t arm_nocache_startaddr;
   void *arm_remap_nocache(void *, vm_size_t);
   void arm_unmap_nocache(void *, vm_size_t);
   
   extern vm_paddr_t dump_avail[];
   #endif  /* _KERNEL */
   
   #endif  /* !LOCORE */
   
   #endif  /* !_MACHINE_PMAP_H_ */

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