forked from Imagelibrary/rtems
69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
/*
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* Copyright (c) 2018.
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* Amaan Cheval <amaan.cheval@gmail.com>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _LIBCPU_AMD64_PAGE_H
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#define _LIBCPU_AMD64_PAGE_H
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#ifndef ASM
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#define NUM_PAGE_TABLE_ENTRIES 512
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extern uint64_t amd64_pml4[NUM_PAGE_TABLE_ENTRIES];
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extern uint64_t amd64_pdpt[NUM_PAGE_TABLE_ENTRIES];
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bool paging_1gib_pages_supported(void);
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uint8_t get_maxphysaddr(void);
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uint64_t get_mask_for_bits(uint8_t start, uint8_t end);
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uint64_t create_cr3_entry(
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uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
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);
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uint64_t create_pml4_entry(
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uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
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);
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uint64_t create_pdpt_entry(
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uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
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);
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void paging_init(void);
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#define PAGE_FLAGS_PRESENT (1 << 0)
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#define PAGE_FLAGS_WRITABLE (1 << 1)
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#define PAGE_FLAGS_USER_ACCESSIBLE (1 << 2)
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#define PAGE_FLAGS_WRITE_THROUGH (1 << 3)
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#define PAGE_FLAGS_NO_CACHE (1 << 4)
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#define PAGE_FLAGS_ACCESSED (1 << 5)
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#define PAGE_FLAGS_DIRTY (1 << 6)
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#define PAGE_FLAGS_HUGE_PAGE (1 << 7)
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#define PAGE_FLAGS_GLOBAL (1 << 8)
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#define PAGE_FLAGS_NO_EXECUTE (1 << 63)
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#define PAGE_FLAGS_DEFAULTS \
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(PAGE_FLAGS_PRESENT | PAGE_FLAGS_WRITABLE | PAGE_FLAGS_USER_ACCESSIBLE \
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| PAGE_FLAGS_WRITE_THROUGH | PAGE_FLAGS_NO_CACHE | PAGE_FLAGS_GLOBAL)
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#endif /* !ASM */
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#endif
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