/* $OpenBSD: pmap.h,v 1.55 2025/06/02 18:49:04 claudio 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. 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 _MIPS64_PMAP_H_ #define _MIPS64_PMAP_H_ #include <sys/mutex.h> #ifdef _KERNEL #include <machine/pte.h> /* * The user address space is currently limited to 1TB (0x0 - 0x10000000000). * * The user address space is mapped using a two level structure where * the virtual addresses bits are split in three groups: * segment:directory:page:offset * where: * - offset are the in-page offsets (PAGE_SHIFT bits) * - page are the third level page table index * (PMAP_PGSHIFT - Log2(pt_entry_t) bits) * - directory are the second level page table (directory) index * (PMAP_PGSHIFT - Log2(void *) bits) * - segment are the first level page table (segment) index * (PMAP_PGSHIFT - Log2(void *) bits) * * This scheme allows Segment, directory and page tables have the same size * (1 << PMAP_PGSHIFT bytes, regardless of the pt_entry_t size) to be able to * share the same allocator. * * 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. */ #if defined(MIPS_PTE64) && PAGE_SHIFT == 12 #error "Cannot use MIPS_PTE64 with 4KB pages." #endif /* * Size of page table structs (page tables, page directories, * and segment table) used by this pmap. */ #define PMAP_PGSHIFT 12 #define PMAP_PGSIZE (1UL << PMAP_PGSHIFT) #define NPDEPG (PMAP_PGSIZE / sizeof(void *)) #define NPTEPG (PMAP_PGSIZE / sizeof(pt_entry_t)) /* * Segment sizes */ #define SEGSHIFT (PAGE_SHIFT+PMAP_PGSHIFT*2-PTE_LOG-3) #define DIRSHIFT (PAGE_SHIFT+PMAP_PGSHIFT-PTE_LOG) #define NBSEG (1UL << SEGSHIFT) #define NBDIR (1UL << DIRSHIFT) #define SEGOFSET (NBSEG - 1) #define DIROFSET (NBDIR - 1) #define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET) #define mips_trunc_dir(x) ((vaddr_t)(x) & ~DIROFSET) #define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET) #define mips_round_dir(x) (((vaddr_t)(x) + DIROFSET) & ~DIROFSET) #define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)]) /* number of segments entries */ #define PMAP_SEGTABSIZE (PMAP_PGSIZE / sizeof(void *)) struct segtab { pt_entry_t **seg_tab[PMAP_SEGTABSIZE]; }; struct pmap_asid_info { u_int pma_asid; /* address space tag */ u_int pma_asidgen; /* TLB PID generation number */ }; /* * Machine dependent pmap structure. */ typedef struct pmap { struct mutex pm_mtx; /* pmap lock */ struct mutex pm_swmtx; /* pmap switch lock */ int pm_count; /* pmap reference count */ struct pmap_statistics pm_stats; /* pmap statistics */ struct segtab *pm_segtab; /* pointers to pages of PTEs */ struct pmap_asid_info pm_asid[1]; /* ASID information */ } *pmap_t; /* * Compute the sizeof of a pmap structure. Subtract one because one * ASID info structure is already included in the pmap structure itself. */ #define PMAP_SIZEOF(x) \ (ALIGN(sizeof(struct pmap) + \ (sizeof(struct pmap_asid_info) * ((x) - 1)))) /* machine-dependent pg_flags */ #define PGF_UNCACHED PG_PMAP0 /* Page is explicitly uncached */ #define PGF_CACHED PG_PMAP1 /* Page is currently cached */ #define PGF_ATTR_MOD PG_PMAP2 #define PGF_ATTR_REF PG_PMAP3 #define PGF_PRESERVE (PGF_ATTR_MOD | PGF_ATTR_REF) #define PMAP_NOCACHE PMAP_MD0 extern struct pmap *const kernel_pmap_ptr; #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_ptr) extern pt_entry_t pg_ri; #define PMAP_CHECK_COPYIN (pg_ri == 0) #define PMAP_STEAL_MEMORY /* Enable 'stealing' during boot */ #define PMAP_PREFER extern vaddr_t pmap_prefer_mask; /* pmap prefer alignment */ #define PMAP_PREFER_ALIGN() \ (pmap_prefer_mask ? pmap_prefer_mask + 1 : 0) /* pmap prefer offset in alignment */ #define PMAP_PREFER_OFFSET(of) ((of) & pmap_prefer_mask) void pmap_bootstrap(void); int pmap_copyinsn(pmap_t, vaddr_t, uint32_t *); int pmap_emulate_modify(pmap_t, vaddr_t); void pmap_page_cache(vm_page_t, u_int); #define pmap_init_percpu() do { /* nothing */ } while (0) #define pmap_unuse_final(p) do { /* nothing yet */ } while (0) #define pmap_remove_holes(vm) do { /* nothing */ } while (0) #define __HAVE_PMAP_DIRECT vaddr_t pmap_map_direct(vm_page_t); vm_page_t pmap_unmap_direct(vaddr_t); /* * MD flags to pmap_enter: */ #define PMAP_PA_MASK ~((paddr_t)PAGE_MASK) /* Kernel virtual address to page table entry */ #define kvtopte(va) \ (Sysmap + (((vaddr_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PAGE_SHIFT)) /* User virtual address to pte page entry */ #define uvtopte(va) (((va) >> PAGE_SHIFT) & (NPTEPG -1)) #define uvtopde(va) (((va) >> DIRSHIFT) & (NPDEPG - 1)) static inline pt_entry_t * pmap_pte_lookup(struct pmap *pmap, vaddr_t va) { pt_entry_t **pde, *pte; if ((pde = pmap_segmap(pmap, va)) == NULL) return NULL; if ((pte = pde[uvtopde(va)]) == NULL) return NULL; return pte + uvtopte(va); } extern pt_entry_t *Sysmap; /* kernel pte table */ extern u_int Sysmapsize; /* number of pte's in Sysmap */ #endif /* _KERNEL */ #if !defined(_LOCORE) typedef struct pv_entry { struct pv_entry *pv_next; /* next pv_entry */ struct pmap *pv_pmap; /* pmap where mapping lies */ vaddr_t pv_va; /* virtual address for mapping */ } *pv_entry_t; struct vm_page_md { struct mutex pv_mtx; /* pv list lock */ struct pv_entry pv_ent; /* pv list of this seg */ }; #define VM_MDPAGE_INIT(pg) \ do { \ mtx_init(&(pg)->mdpage.pv_mtx, IPL_VM); \ (pg)->mdpage.pv_ent.pv_next = NULL; \ (pg)->mdpage.pv_ent.pv_pmap = NULL; \ (pg)->mdpage.pv_ent.pv_va = 0; \ } while (0) #endif /* !_LOCORE */ #endif /* !_MIPS64_PMAP_H_ */
