/*
* 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.
*/
#ifndef __ia32_PAGE_H__
#define __ia32_PAGE_H__
#include <arch/mm/frame.h>
#define PAGE_WIDTH FRAME_WIDTH
#define PAGE_SIZE FRAME_SIZE
#ifdef KERNEL
#ifndef __ASM__
# define KA2PA(x) (((__address) (x)) - 0x80000000)
# define PA2KA(x) (((__address) (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.
*/
#define PTL0_ENTRIES_ARCH 1024
#define PTL1_ENTRIES_ARCH 0
#define PTL2_ENTRIES_ARCH 0
#define PTL3_ENTRIES_ARCH 1024
#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)
#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) ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
#define SET_PTL0_ADDRESS_ARCH(ptl0) (write_cr3((__address) (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)
#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))
#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))
#define PTE_VALID_ARCH(p) (*((__u32 *) (p)) != 0)
#define PTE_PRESENT_ARCH(p) ((p)->present != 0)
#define PTE_GET_FRAME_ARCH(p) ((p)->frame_address<<FRAME_WIDTH)
#ifndef __ASM__
#include <mm/page.h>
#include <arch/types.h>
#include <arch/mm/frame.h>
#include <typedefs.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)
/** Page Table Entry. */
struct page_specifier {
unsigned present : 1;
unsigned writeable : 1;
unsigned uaccessible : 1;
unsigned page_write_through : 1;
unsigned page_cache_disable : 1;
unsigned accessed : 1;
unsigned dirty : 1;
unsigned pat : 1;
unsigned global : 1;
unsigned soft_valid : 1; /**< Valid content even if the present bit is not set. */
unsigned avl : 2;
unsigned frame_address : 20;
} __attribute__ ((packed));
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