mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-07-07 05:35:39 -04:00
Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
480 lines
15 KiB
C
Vendored
480 lines
15 KiB
C
Vendored
/* $OpenBSD: pmap.h,v 1.98 2025/07/16 07:15:42 jsg Exp $ */
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/* $NetBSD: pmap.h,v 1.44 2000/04/24 17:18:18 thorpej Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* pmap.h: see pmap.c for the history of this pmap module.
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*/
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#ifndef _MACHINE_PMAP_H_
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#define _MACHINE_PMAP_H_
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#ifdef _KERNEL
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#include <machine/cpufunc.h>
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#include <machine/segments.h>
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#endif
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#include <sys/mutex.h>
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#include <uvm/uvm_object.h>
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#include <machine/pte.h>
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#define PDSLOT_PTE ((KERNBASE/NBPD)-2) /* 830: for recursive PDP map */
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#define PDSLOT_KERN (KERNBASE/NBPD) /* 832: start of kernel space */
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#define PDSLOT_APTE ((unsigned)1022) /* 1022: alternative recursive slot */
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/*
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* The following define determines how many PTPs should be set up for the
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* kernel by locore.s at boot time. This should be large enough to
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* get the VM system running. Once the VM system is running, the
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* pmap module can add more PTPs to the kernel area on demand.
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*/
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#ifndef NKPTP
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#define NKPTP 8 /* 16/32MB to start */
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#endif
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#define NKPTP_MIN 4 /* smallest value we allow */
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/*
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* PG_AVAIL usage: we make use of the ignored bits of the PTE
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*/
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#define PG_W PG_AVAIL1 /* "wired" mapping */
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#define PG_PVLIST PG_AVAIL2 /* mapping has entry on pvlist */
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#define PG_X PG_AVAIL3 /* executable mapping */
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#define PTP0_PA (PAGE_SIZE * 3)
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#ifdef _KERNEL
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/*
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* pmap data structures: see pmap.c for details of locking.
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*/
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struct pmap;
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typedef struct pmap *pmap_t;
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/*
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* We maintain a list of all non-kernel pmaps.
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*/
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LIST_HEAD(pmap_head, pmap); /* struct pmap_head: head of a pmap list */
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/*
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* The pmap structure
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*
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* Note that the pm_obj contains the reference count,
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* page list, and number of PTPs within the pmap.
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*/
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struct pmap {
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uint64_t pm_pdidx[4]; /* PDIEs for PAE mode */
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uint64_t pm_pdidx_intel[4]; /* PDIEs for PAE mode U-K */
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struct mutex pm_mtx;
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struct mutex pm_apte_mtx;
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/*
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* pm_pdir : VA of PD when executing in privileged mode
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* (lock by object lock)
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* pm_pdirpa : PA of PD when executing in privileged mode,
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* (read-only after create)
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* pm_pdir_intel : VA of PD when executing on Intel CPU in
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* usermode (no kernel mappings)
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* pm_pdirpa_intel : PA of PD when executing on Intel CPU in
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* usermode (no kernel mappings)
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*/
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paddr_t pm_pdirpa, pm_pdirpa_intel;
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vaddr_t pm_pdir, pm_pdir_intel;
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int pm_pdirsize; /* PD size (4k vs 16k on PAE) */
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struct uvm_object pm_obj; /* object (lck by object lock) */
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LIST_ENTRY(pmap) pm_list; /* list (lck by pm_list lock) */
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struct vm_page *pm_ptphint; /* pointer to a PTP in our pmap */
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struct pmap_statistics pm_stats; /* pmap stats (lck by object lock) */
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vaddr_t pm_hiexec; /* highest executable mapping */
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int pm_flags; /* see below */
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struct segment_descriptor pm_codeseg; /* cs descriptor for process */
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};
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/*
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* For each managed physical page we maintain a list of <PMAP,VA>s
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* which it is mapped at. The list is headed by a pv_head structure.
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* there is one pv_head per managed phys page (allocated at boot time).
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* The pv_head structure points to a list of pv_entry structures (each
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* describes one mapping).
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*/
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struct pv_entry { /* locked by its list's pvh_lock */
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struct pv_entry *pv_next; /* next entry */
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struct pmap *pv_pmap; /* the pmap */
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vaddr_t pv_va; /* the virtual address */
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struct vm_page *pv_ptp; /* the vm_page of the PTP */
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};
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/*
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* MD flags to pmap_enter:
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*/
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/* to get just the pa from params to pmap_enter */
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#define PMAP_PA_MASK ~((paddr_t)PAGE_MASK)
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#define PMAP_NOCACHE 0x1 /* map uncached */
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#define PMAP_WC 0x2 /* map write combining. */
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/*
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* We keep mod/ref flags in struct vm_page->pg_flags.
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*/
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#define PG_PMAP_MOD PG_PMAP0
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#define PG_PMAP_REF PG_PMAP1
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#define PG_PMAP_WC PG_PMAP2
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/*
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* pv_entrys are dynamically allocated in chunks from a single page.
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* we keep track of how many pv_entrys are in use for each page and
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* we can free pv_entry pages if needed. There is one lock for the
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* entire allocation system.
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*/
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struct pv_page_info {
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TAILQ_ENTRY(pv_page) pvpi_list;
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struct pv_entry *pvpi_pvfree;
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int pvpi_nfree;
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};
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/*
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* number of pv_entries in a pv_page
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*/
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#define PVE_PER_PVPAGE ((PAGE_SIZE - sizeof(struct pv_page_info)) / \
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sizeof(struct pv_entry))
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/*
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* a pv_page: where pv_entrys are allocated from
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*/
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struct pv_page {
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struct pv_page_info pvinfo;
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struct pv_entry pvents[PVE_PER_PVPAGE];
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};
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/*
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* pv_entrys are dynamically allocated in chunks from a single page.
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* we keep track of how many pv_entrys are in use for each page and
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* we can free pv_entry pages if needed. There is one lock for the
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* entire allocation system.
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*/
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extern char PTD[];
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extern struct pmap kernel_pmap_store; /* kernel pmap */
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extern int nkptp_max;
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#define PMAP_REMOVE_ALL 0
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#define PMAP_REMOVE_SKIPWIRED 1
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extern struct pool pmap_pv_pool;
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/*
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* Macros
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*/
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#define pmap_kernel() (&kernel_pmap_store)
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#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
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#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
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#define pmap_update(pm) /* nada */
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#define pmap_clear_modify(pg) pmap_clear_attrs(pg, PG_M)
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#define pmap_clear_reference(pg) pmap_clear_attrs(pg, PG_U)
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#define pmap_is_modified(pg) pmap_test_attrs(pg, PG_M)
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#define pmap_is_referenced(pg) pmap_test_attrs(pg, PG_U)
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#define pmap_valid_entry(E) ((E) & PG_V) /* is PDE or PTE valid? */
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#define pmap_proc_iflush(p,va,len) /* nothing */
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#define pmap_init_percpu() do { /* nothing */ } while (0)
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#define pmap_unuse_final(p) /* nothing */
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#define pmap_remove_holes(vm) do { /* nothing */ } while (0)
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/*
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* Prototypes
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*/
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vaddr_t pmap_tmpmap_pa_86(paddr_t);
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vaddr_t pmap_tmpmap_pa(paddr_t);
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void pmap_tmpunmap_pa_86(void);
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void pmap_tmpunmap_pa(void);
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void pmap_bootstrap(vaddr_t);
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void pmap_bootstrap_pae(void);
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void pmap_virtual_space(vaddr_t *, vaddr_t *);
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void pmap_init(void);
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struct pmap *pmap_create(void);
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void pmap_destroy(struct pmap *);
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void pmap_reference(struct pmap *);
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void pmap_remove(struct pmap *, vaddr_t, vaddr_t);
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void pmap_activate(struct proc *);
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void pmap_deactivate(struct proc *);
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void pmap_kenter_pa(vaddr_t, paddr_t, vm_prot_t);
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void pmap_kremove(vaddr_t, vsize_t);
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void pmap_zero_page(struct vm_page *);
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void pmap_copy_page(struct vm_page *, struct vm_page *);
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void pmap_enter_pv(struct vm_page *, struct pv_entry *,
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struct pmap *, vaddr_t, struct vm_page *);
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int pmap_clear_attrs(struct vm_page *, int);
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static void pmap_page_protect(struct vm_page *, vm_prot_t);
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void pmap_page_remove(struct vm_page *);
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static void pmap_protect(struct pmap *, vaddr_t,
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vaddr_t, vm_prot_t);
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void pmap_remove(struct pmap *, vaddr_t, vaddr_t);
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int pmap_test_attrs(struct vm_page *, int);
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void pmap_write_protect(struct pmap *, vaddr_t,
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vaddr_t, vm_prot_t);
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int pmap_exec_fixup(struct vm_map *, struct trapframe *,
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vaddr_t, struct pcb *);
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void pmap_exec_account(struct pmap *, vaddr_t, u_int32_t,
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u_int32_t);
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struct pv_entry *pmap_remove_pv(struct vm_page *, struct pmap *, vaddr_t);
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void pmap_apte_flush(void);
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void pmap_switch(struct proc *, struct proc *);
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vaddr_t reserve_dumppages(vaddr_t); /* XXX: not a pmap fn */
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paddr_t vtophys(vaddr_t va);
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paddr_t vtophys_pae(vaddr_t va);
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extern u_int32_t (*pmap_pte_set_p)(vaddr_t, paddr_t, u_int32_t);
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extern u_int32_t (*pmap_pte_setbits_p)(vaddr_t, u_int32_t, u_int32_t);
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extern u_int32_t (*pmap_pte_bits_p)(vaddr_t);
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extern paddr_t (*pmap_pte_paddr_p)(vaddr_t);
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extern int (*pmap_clear_attrs_p)(struct vm_page *, int);
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extern int (*pmap_enter_p)(pmap_t, vaddr_t, paddr_t, vm_prot_t, int);
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extern void (*pmap_enter_special_p)(vaddr_t, paddr_t, vm_prot_t, u_int32_t);
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extern int (*pmap_extract_p)(pmap_t, vaddr_t, paddr_t *);
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extern vaddr_t (*pmap_growkernel_p)(vaddr_t);
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extern void (*pmap_page_remove_p)(struct vm_page *);
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extern void (*pmap_do_remove_p)(struct pmap *, vaddr_t, vaddr_t, int);
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extern int (*pmap_test_attrs_p)(struct vm_page *, int);
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extern void (*pmap_unwire_p)(struct pmap *, vaddr_t);
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extern void (*pmap_write_protect_p)(struct pmap*, vaddr_t, vaddr_t, vm_prot_t);
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extern void (*pmap_pinit_pd_p)(pmap_t);
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extern void (*pmap_zero_phys_p)(paddr_t);
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extern void (*pmap_copy_page_p)(struct vm_page *, struct vm_page *);
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u_int32_t pmap_pte_set_pae(vaddr_t, paddr_t, u_int32_t);
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u_int32_t pmap_pte_setbits_pae(vaddr_t, u_int32_t, u_int32_t);
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u_int32_t pmap_pte_bits_pae(vaddr_t);
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paddr_t pmap_pte_paddr_pae(vaddr_t);
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int pmap_clear_attrs_pae(struct vm_page *, int);
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int pmap_enter_pae(pmap_t, vaddr_t, paddr_t, vm_prot_t, int);
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void pmap_enter_special_pae(vaddr_t, paddr_t, vm_prot_t, u_int32_t);
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int pmap_extract_pae(pmap_t, vaddr_t, paddr_t *);
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vaddr_t pmap_growkernel_pae(vaddr_t);
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void pmap_page_remove_pae(struct vm_page *);
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void pmap_do_remove_pae(struct pmap *, vaddr_t, vaddr_t, int);
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int pmap_test_attrs_pae(struct vm_page *, int);
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void pmap_unwire_pae(struct pmap *, vaddr_t);
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void pmap_write_protect_pae(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
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void pmap_pinit_pd_pae(pmap_t);
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void pmap_zero_phys_pae(paddr_t);
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void pmap_copy_page_pae(struct vm_page *, struct vm_page *);
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#define pmap_pte_set (*pmap_pte_set_p)
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#define pmap_pte_setbits (*pmap_pte_setbits_p)
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#define pmap_pte_bits (*pmap_pte_bits_p)
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#define pmap_pte_paddr (*pmap_pte_paddr_p)
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#define pmap_clear_attrs (*pmap_clear_attrs_p)
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#define pmap_page_remove (*pmap_page_remove_p)
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#define pmap_do_remove (*pmap_do_remove_p)
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#define pmap_test_attrs (*pmap_test_attrs_p)
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#define pmap_unwire (*pmap_unwire_p)
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#define pmap_write_protect (*pmap_write_protect_p)
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#define pmap_pinit_pd (*pmap_pinit_pd_p)
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#define pmap_zero_phys (*pmap_zero_phys_p)
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#define pmap_copy_page (*pmap_copy_page_p)
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u_int32_t pmap_pte_set_86(vaddr_t, paddr_t, u_int32_t);
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u_int32_t pmap_pte_setbits_86(vaddr_t, u_int32_t, u_int32_t);
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u_int32_t pmap_pte_bits_86(vaddr_t);
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paddr_t pmap_pte_paddr_86(vaddr_t);
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int pmap_clear_attrs_86(struct vm_page *, int);
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int pmap_enter_86(pmap_t, vaddr_t, paddr_t, vm_prot_t, int);
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void pmap_enter_special_86(vaddr_t, paddr_t, vm_prot_t, u_int32_t);
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int pmap_extract_86(pmap_t, vaddr_t, paddr_t *);
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vaddr_t pmap_growkernel_86(vaddr_t);
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void pmap_page_remove_86(struct vm_page *);
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void pmap_do_remove_86(struct pmap *, vaddr_t, vaddr_t, int);
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int pmap_test_attrs_86(struct vm_page *, int);
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void pmap_unwire_86(struct pmap *, vaddr_t);
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void pmap_write_protect_86(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
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void pmap_pinit_pd_86(pmap_t);
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void pmap_zero_phys_86(paddr_t);
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void pmap_copy_page_86(struct vm_page *, struct vm_page *);
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void pmap_tlb_shootpage(struct pmap *, vaddr_t);
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void pmap_tlb_shootrange(struct pmap *, vaddr_t, vaddr_t);
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void pmap_tlb_shoottlb(void);
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#ifdef MULTIPROCESSOR
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void pmap_tlb_droppmap(struct pmap *);
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void pmap_tlb_shootwait(void);
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#else
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#define pmap_tlb_shootwait()
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#endif
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void pmap_prealloc_lowmem_ptp(void);
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void pmap_prealloc_lowmem_ptp_pae(void);
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vaddr_t pmap_tmpmap_pa(paddr_t);
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void pmap_tmpunmap_pa(void);
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vaddr_t pmap_tmpmap_pa_pae(paddr_t);
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void pmap_tmpunmap_pa_pae(void);
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/*
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* functions for flushing the cache for vaddrs and pages.
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* these functions are not part of the MI pmap interface and thus
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* should not be used as such.
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*/
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void pmap_flush_cache(vaddr_t, vsize_t);
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void pmap_flush_page(paddr_t);
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void pmap_flush_page_pae(paddr_t);
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#define PMAP_CHECK_COPYIN 1
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#define PMAP_GROWKERNEL /* turn on pmap_growkernel interface */
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/*
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* Inline functions
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*/
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/*
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* pmap_update_pg: flush one page from the TLB (or flush the whole thing
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* if hardware doesn't support one-page flushing)
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*/
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#define pmap_update_pg(va) invlpg((u_int)(va))
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/*
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* pmap_update_2pg: flush two pages from the TLB
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*/
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#define pmap_update_2pg(va, vb) { invlpg((u_int)(va)); invlpg((u_int)(vb)); }
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/*
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* pmap_page_protect: change the protection of all recorded mappings
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* of a managed page
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*
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* => This function is a front end for pmap_page_remove/pmap_clear_attrs
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* => We only have to worry about making the page more protected.
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* Unprotecting a page is done on-demand at fault time.
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*/
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static __inline void
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pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
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{
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if ((prot & PROT_WRITE) == 0) {
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if (prot & (PROT_READ | PROT_EXEC)) {
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(void) pmap_clear_attrs(pg, PG_RW);
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} else {
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pmap_page_remove(pg);
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}
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}
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}
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/*
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* pmap_protect: change the protection of pages in a pmap
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*
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* => This function is a front end for pmap_remove/pmap_write_protect.
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* => We only have to worry about making the page more protected.
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* Unprotecting a page is done on-demand at fault time.
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*/
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static __inline void
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pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
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{
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if ((prot & PROT_WRITE) == 0) {
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if (prot & (PROT_READ | PROT_EXEC)) {
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pmap_write_protect(pmap, sva, eva, prot);
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} else {
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pmap_remove(pmap, sva, eva);
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}
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}
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|
}
|
|
|
|
/*
|
|
* pmap_growkernel, pmap_enter, and pmap_extract get picked up in various
|
|
* modules from both uvm_pmap.h and pmap.h. Since uvm_pmap.h defines these
|
|
* as functions, inline them here to suppress linker warnings.
|
|
*/
|
|
static __inline vaddr_t
|
|
pmap_growkernel(vaddr_t maxkvaddr)
|
|
{
|
|
return (*pmap_growkernel_p)(maxkvaddr);
|
|
}
|
|
|
|
static __inline int
|
|
pmap_enter(struct pmap *pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
|
|
{
|
|
return (*pmap_enter_p)(pmap, va, pa, prot, flags);
|
|
}
|
|
|
|
static __inline void
|
|
pmap_enter_special(vaddr_t va, paddr_t pa, vm_prot_t prot, u_int32_t flags)
|
|
{
|
|
(*pmap_enter_special_p)(va, pa, prot, flags);
|
|
}
|
|
|
|
static __inline int
|
|
pmap_extract(struct pmap *pmap, vaddr_t va, paddr_t *pa)
|
|
{
|
|
return (*pmap_extract_p)(pmap, va, pa);
|
|
}
|
|
|
|
/*
|
|
* p m a p i n l i n e h e l p e r f u n c t i o n s
|
|
*/
|
|
|
|
/*
|
|
* pmap_is_active: is this pmap loaded into the specified processor's %cr3?
|
|
*/
|
|
|
|
static __inline int
|
|
pmap_is_active(struct pmap *pmap, struct cpu_info *ci)
|
|
{
|
|
return (pmap == pmap_kernel() || ci->ci_curpmap == pmap);
|
|
}
|
|
|
|
static __inline int
|
|
pmap_is_curpmap(struct pmap *pmap)
|
|
{
|
|
return (pmap_is_active(pmap, curcpu()));
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
struct pv_entry;
|
|
struct vm_page_md {
|
|
struct mutex pv_mtx;
|
|
struct pv_entry *pv_list;
|
|
};
|
|
|
|
#define VM_MDPAGE_INIT(pg) do { \
|
|
mtx_init(&(pg)->mdpage.pv_mtx, IPL_VM); \
|
|
(pg)->mdpage.pv_list = NULL; \
|
|
} while (0)
|
|
|
|
#endif /* _MACHINE_PMAP_H_ */ |