145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen 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 are met:
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* * 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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* * 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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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY 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 THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Steffen Vogel
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* @file arch/x86/include/asm/page.h
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* @brief Paging related functions
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*
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* This file contains the several functions to manage the page tables
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*/
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#include <eduos/tasks_types.h>
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#ifndef __PAGE_H__
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#define __PAGE_H__
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/// Page offset bits
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#define PAGE_BITS 12
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/// The size of a single page in bytes
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#define PAGE_SIZE ( 1L << PAGE_BITS)
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/// Mask the page address without page map flags
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#define PAGE_MASK (-1L << PAGE_BITS)
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/// Total operand width in bits
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#define BITS 32
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/// Linear/virtual address width
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#define VIRT_BITS BITS
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/// Physical address width (we dont support PAE)
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#define PHYS_BITS BITS
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/// Page map bits
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#define PAGE_MAP_BITS 10
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/// Number of page map indirections
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#define PAGE_LEVELS 2
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/// Make address canonical
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#define CANONICAL(addr) (addr) // only for 32 bit paging
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/// The number of entries in a page map table
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#define PAGE_MAP_ENTRIES (1L << PAGE_MAP_BITS)
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/// Align to next page
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#define PAGE_FLOOR(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
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/// Align to page
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#define PAGE_CEIL(addr) ( (addr) & PAGE_MASK)
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/// Page is present
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#define PG_PRESENT (1 << 0)
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/// Page is read- and writable
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#define PG_RW (1 << 1)
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/// Page is addressable from userspace
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#define PG_USER (1 << 2)
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/// Page write through is activated
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#define PG_PWT (1 << 3)
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/// Page cache is disabled
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#define PG_PCD (1 << 4)
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/// Page was recently accessed (set by CPU)
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#define PG_ACCESSED (1 << 5)
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/// Page is dirty due to recent write-access (set by CPU)
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#define PG_DIRTY (1 << 6)
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/// Huge page: 4MB (or 2MB, 1GB)
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#define PG_PSE (1 << 7)
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/// Page attribute table
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#define PG_PAT PG_PSE
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/// Global TLB entry (Pentium Pro and later)
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#define PG_GLOBAL (1 << 8)
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/// This table is a self-reference and should skipped by page_map_copy()
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#define PG_SELF (1 << 9)
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/// This page is used for bootstrapping the paging code.
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#define PG_BOOT PG_SELF
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/// This page is reserved for copying
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#define PAGE_TMP (PAGE_FLOOR((size_t) &kernel_start) - PAGE_SIZE)
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/** @brief Converts a virtual address to a physical
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*
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* A non mapped virtual address causes a pagefault!
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*
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* @param addr Virtual address to convert
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* @return physical address
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*/
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size_t page_virt_to_phys(size_t vir);
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/** @brief Initialize paging subsystem
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*
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* This function uses the existing bootstrap page tables (boot_{pgd, pgt})
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* to map required regions (video memory, kernel, etc..).
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* Before calling page_init(), the bootstrap tables contain a simple identity
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* paging. Which is replaced by more specific mappings.
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*/
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int page_init();
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/** @brief Map a continious region of pages
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*
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* @param viraddr
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* @param phyaddr
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* @param npages
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* @param bits
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* @return
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*/
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int page_map(size_t viraddr, size_t phyaddr, size_t npages, size_t bits);
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/** @brief Unmap a continious region of pages
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*
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* @param viraddr
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* @param npages
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* @return
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*/
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int page_unmap(size_t viraddr, size_t npages);
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/** @brief Copy a whole page map tree
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*
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* @param dest Physical address of new page map
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* @retval 0 Success. Everything went fine.
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* @retval <0 Error. Something went wrong.
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*/
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int page_map_copy(task_t *dest);
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/** @brief Free a whole page map tree */
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int page_map_drop();
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#endif
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