/*
* Copyright (c) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/** @addtogroup ia32mm
* @{
*/
/** @file
*/
#ifndef KERN_ia32_PAGE_H_
#define KERN_ia32_PAGE_H_
#include <arch/mm/frame.h>
#define PAGE_WIDTH FRAME_WIDTH
#define PAGE_SIZE FRAME_SIZE
#define PAGE_COLOR_BITS 0 /* dummy */
#ifdef KERNEL
#ifndef __ASM__
# define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
# define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
#else
# define KA2PA(x) ((x) - 0x80000000)
# define PA2KA(x) ((x) + 0x80000000)
#endif
/*
* Implementation of generic 4-level page table interface.
* IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
*/
/* Number of entries in each level. */
#define PTL0_ENTRIES_ARCH 1024
#define PTL1_ENTRIES_ARCH 0
#define PTL2_ENTRIES_ARCH 0
#define PTL3_ENTRIES_ARCH 1024
/* Page table sizes for each level. */
#define PTL0_SIZE_ARCH ONE_FRAME
#define PTL1_SIZE_ARCH 0
#define PTL2_SIZE_ARCH 0
#define PTL3_SIZE_ARCH ONE_FRAME
/* Macros calculating indices for each level. */
#define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 22) & 0x3ff)
#define PTL1_INDEX_ARCH(vaddr) 0
#define PTL2_INDEX_ARCH(vaddr) 0
#define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x3ff)
/* Get PTE address accessors for each level. */
#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
((pte_t *) ((((pte_t *) (ptl0))[(i)].frame_address) << 12))
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
(ptl1)
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
(ptl2)
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
((uintptr_t) ((((pte_t *) (ptl3))[(i)].frame_address) << 12))
/* Set PTE address accessors for each level. */
#define SET_PTL0_ADDRESS_ARCH(ptl0) \
(write_cr3((uintptr_t) (ptl0)))
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
(((pte_t *) (ptl0))[(i)].frame_address = (a) >> 12)
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
(((pte_t *) (ptl3))[(i)].frame_address = (a) >> 12)
/* Get PTE flags accessors for each level. */
#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
get_pt_flags((pte_t *) (ptl0), (index_t) (i))
#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
PAGE_PRESENT
#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
PAGE_PRESENT
#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
get_pt_flags((pte_t *) (ptl3), (index_t) (i))
/* Set PTE flags accessors for each level. */
#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
/* Macros for querying the last level entries. */
#define PTE_VALID_ARCH(p) \
(*((uint32_t *) (p)) != 0)
#define PTE_PRESENT_ARCH(p) \
((p)->present != 0)
#define PTE_GET_FRAME_ARCH(p) \
((p)->frame_address << FRAME_WIDTH)
#define PTE_WRITABLE_ARCH(p) \
((p)->writeable != 0)
#define PTE_EXECUTABLE_ARCH(p) 1
#ifndef __ASM__
#include <mm/mm.h>
#include <arch/interrupt.h>
/* Page fault error codes. */
/** When bit on this position is 0, the page fault was caused by a not-present
* page.
*/
#define PFERR_CODE_P (1 << 0)
/** When bit on this position is 1, the page fault was caused by a write. */
#define PFERR_CODE_RW (1 << 1)
/** When bit on this position is 1, the page fault was caused in user mode. */
#define PFERR_CODE_US (1 << 2)
/** When bit on this position is 1, a reserved bit was set in page directory. */
#define PFERR_CODE_RSVD (1 << 3)
static inline int get_pt_flags(pte_t *pt, index_t i)
{
pte_t *p = &pt[i];
return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
(!p->present) << PAGE_PRESENT_SHIFT |
p->uaccessible << PAGE_USER_SHIFT |
1 << PAGE_READ_SHIFT |
p->writeable << PAGE_WRITE_SHIFT |
1 << PAGE_EXEC_SHIFT |
p->global << PAGE_GLOBAL_SHIFT);
}
static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
{
pte_t *p = &pt[i];
p->page_cache_disable = !(flags & PAGE_CACHEABLE);
p->present = !(flags & PAGE_NOT_PRESENT);
p->uaccessible = (flags & PAGE_USER) != 0;
p->writeable = (flags & PAGE_WRITE) != 0;
p->global = (flags & PAGE_GLOBAL) != 0;
/*
* Ensure that there is at least one bit set even if the present bit is
* cleared.
*/
p->soft_valid = true;
}
extern void page_arch_init(void);
extern void page_fault(int n, istate_t *istate);
#endif /* __ASM__ */
#endif /* KERNEL */
#endif
/** @}
*/