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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2019 9elements Agency GmbH
* Copyright (C) 2019 Facebook Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef CPU_X86_PAE_H
#define CPU_X86_PAE_H
#include <stdint.h>
#include <stddef.h>
/* Enable paging with cr3 value for page directory pointer table as well as PAE
option in cr4. */
void paging_enable_pae_cr3(uintptr_t cr3);
/* Enable paging as well as PAE option in cr4. */
void paging_enable_pae(void);
/* Disable paging as well as PAE option in cr4. */
void paging_disable_pae(void);
/* Set/Clear NXE bit in IA32_EFER MSR */
void paging_set_nxe(int enable);
#define PAT_UC 0
#define PAT_WC 1
#define PAT_WT 4
#define PAT_WP 5
#define PAT_WB 6
#define PAT_UC_MINUS 7
#define PAT_ENCODE(type, idx) (((uint64_t)PAT_ ## type) << 8*(idx))
/* Set PAT MSR */
void paging_set_pat(uint64_t pat);
/* Set coreboot default PAT value. */
void paging_set_default_pat(void);
/* Load page directory pointer table and page tables from cbfs identified by
* the provided the names then enable paging. Return 0 on success, < 0 on
* failure. */
int paging_enable_for_car(const char *pdpt_name, const char *pt_name);
/* Identity map the region indicated by 'base' and 'size'. Both 'base' and
* 'size' need to be 4KiB or 2 MiB aligned. 'pat' should be one of the
* PAT defines above. 0 is returned on success, < 0 on failure. */
int paging_identity_map_addr(uintptr_t base, size_t size, int pat);
#define MAPPING_ERROR ((void *)0xffffffffUL)
void *map_2M_page(unsigned long page);
/* To be used with memset_pae */
#define MEMSET_PAE_VMEM_ALIGN (2 * MiB)
#define MEMSET_PAE_VMEM_SIZE (2 * MiB)
#define MEMSET_PAE_PGTL_ALIGN (4 * KiB)
#define MEMSET_PAE_PGTL_SIZE (20 * KiB)
int memset_pae(uint64_t dest, unsigned char pat, uint64_t length, void *pgtbl,
void *vmem_addr);
#endif /* CPU_X86_PAE_H */
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