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/*
* Copyright (c) 2018.
* Amaan Cheval <amaan.cheval@gmail.com>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#ifndef _LIBCPU_AMD64_PAGE_H
#define _LIBCPU_AMD64_PAGE_H
#ifndef ASM
#define NUM_PAGE_TABLE_ENTRIES 512
extern uint64_t amd64_pml4[NUM_PAGE_TABLE_ENTRIES];
extern uint64_t amd64_pdpt[NUM_PAGE_TABLE_ENTRIES];
bool paging_1gib_pages_supported(void);
uint8_t get_maxphysaddr(void);
uint64_t get_mask_for_bits(uint8_t start, uint8_t end);
uint64_t create_cr3_entry(
uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
);
uint64_t create_pml4_entry(
uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
);
uint64_t create_pdpt_entry(
uint64_t phys_addr, uint8_t maxphysaddr, uint64_t flags
);
void paging_init(void);
#define PAGE_FLAGS_PRESENT (1 << 0)
#define PAGE_FLAGS_WRITABLE (1 << 1)
#define PAGE_FLAGS_USER_ACCESSIBLE (1 << 2)
#define PAGE_FLAGS_WRITE_THROUGH (1 << 3)
#define PAGE_FLAGS_NO_CACHE (1 << 4)
#define PAGE_FLAGS_ACCESSED (1 << 5)
#define PAGE_FLAGS_DIRTY (1 << 6)
#define PAGE_FLAGS_HUGE_PAGE (1 << 7)
#define PAGE_FLAGS_GLOBAL (1 << 8)
#define PAGE_FLAGS_NO_EXECUTE (1 << 63)
#define PAGE_FLAGS_DEFAULTS \
(PAGE_FLAGS_PRESENT | PAGE_FLAGS_WRITABLE | PAGE_FLAGS_USER_ACCESSIBLE \
| PAGE_FLAGS_WRITE_THROUGH | PAGE_FLAGS_NO_CACHE | PAGE_FLAGS_GLOBAL)
#endif /* !ASM */
#endif
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