/*
* Copyright (c) 2005 Ondrej Palkovsky
* 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 amd64mm
* @{
*/
/** @file
*/
/** Paging on AMD64
*
* The space is divided in positive numbers - userspace and
* negative numbers - kernel space. The 'negative' space starting
* with 0xffff800000000000 and ending with 0xffffffff80000000
* (-2GB) is identically mapped physical memory. The area
* (0xffffffff80000000 ... 0xffffffffffffffff is again identically
* mapped first 2GB.
*
* ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
*/
#ifndef KERN_amd64_PAGE_H_
#define KERN_amd64_PAGE_H_
#include <arch/mm/frame.h>
#define PAGE_WIDTH FRAME_WIDTH
#define PAGE_SIZE FRAME_SIZE
#ifdef KERNEL
#ifndef __ASM__
# include <mm/mm.h>
# include <arch/types.h>
# include <arch/interrupt.h>
static inline uintptr_t ka2pa(uintptr_t x)
{
if (x > 0xffffffff80000000)
return x - 0xffffffff80000000;
else
return x - 0xffff800000000000;
}
# define KA2PA(x) ka2pa((uintptr_t) x)
# define PA2KA_CODE(x) (((uintptr_t) (x)) + 0xffffffff80000000)
# define PA2KA(x) (((uintptr_t) (x)) + 0xffff800000000000)
#else
# define KA2PA(x) ((x) - 0xffffffff80000000)
# define PA2KA(x) ((x) + 0xffffffff80000000)
#endif
/* Number of entries in each level. */
#define PTL0_ENTRIES_ARCH 512
#define PTL1_ENTRIES_ARCH 512
#define PTL2_ENTRIES_ARCH 512
#define PTL3_ENTRIES_ARCH 512
/* Page table sizes for each level. */
#define PTL0_SIZE_ARCH ONE_FRAME
#define PTL1_SIZE_ARCH ONE_FRAME
#define PTL2_SIZE_ARCH ONE_FRAME
#define PTL3_SIZE_ARCH ONE_FRAME
/* Macros calculating indices into page tables in each level. */
#define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 39) & 0x1ff)
#define PTL1_INDEX_ARCH(vaddr) (((vaddr) >> 30) & 0x1ff)
#define PTL2_INDEX_ARCH(vaddr) (((vaddr) >> 21) & 0x1ff)
#define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x1ff)
/* Get PTE address accessors for each level. */
#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
((pte_t *) ((((uint64_t) ((pte_t *) (ptl0))[(i)].addr_12_31) << 12) | \
(((uint64_t) ((pte_t *) (ptl0))[(i)].addr_32_51) << 32)))
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
((pte_t *) ((((uint64_t) ((pte_t *) (ptl1))[(i)].addr_12_31) << 12) | \
(((uint64_t) ((pte_t *) (ptl1))[(i)].addr_32_51) << 32)))
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
((pte_t *) ((((uint64_t) ((pte_t *) (ptl2))[(i)].addr_12_31) << 12) | \
(((uint64_t) ((pte_t *) (ptl2))[(i)].addr_32_51) << 32)))
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
((uintptr_t *) \
((((uint64_t) ((pte_t *) (ptl3))[(i)].addr_12_31) << 12) | \
(((uint64_t) ((pte_t *) (ptl3))[(i)].addr_32_51) << 32)))
/* 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) \
set_pt_addr((pte_t *) (ptl0), (index_t) (i), a)
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) \
set_pt_addr((pte_t *) (ptl1), (index_t) (i), a)
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) \
set_pt_addr((pte_t *) (ptl2), (index_t) (i), a)
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
set_pt_addr((pte_t *) (ptl3), (index_t) (i), a)
/* 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) \
get_pt_flags((pte_t *) (ptl1), (index_t) (i))
#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
get_pt_flags((pte_t *) (ptl2), (index_t) (i))
#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) \
set_pt_flags((pte_t *) (ptl1), (index_t) (i), (x))
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x) \
set_pt_flags((pte_t *) (ptl2), (index_t) (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 PTE entries. */
#define PTE_VALID_ARCH(p) \
(*((uint64_t *) (p)) != 0)
#define PTE_PRESENT_ARCH(p) \
((p)->present != 0)
#define PTE_GET_FRAME_ARCH(p) \
((((uintptr_t) (p)->addr_12_31) << 12) | \
((uintptr_t) (p)->addr_32_51 << 32))
#define PTE_WRITABLE_ARCH(p) \
((p)->writeable != 0)
#define PTE_EXECUTABLE_ARCH(p) \
((p)->no_execute == 0)
#ifndef __ASM__
/* 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)
/** When bit on this position os 1, the page fault was caused during instruction
* fecth.
*/
#define PFERR_CODE_ID (1 << 4)
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 |
(!p->no_execute) << PAGE_EXEC_SHIFT |
p->global << PAGE_GLOBAL_SHIFT);
}
static inline void set_pt_addr(pte_t *pt, index_t i, uintptr_t a)
{
pte_t *p = &pt[i];
p->addr_12_31 = (a >> 12) & 0xfffff;
p->addr_32_51 = a >> 32;
}
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->no_execute = (flags & PAGE_EXEC) == 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 = 1;
}
extern void page_arch_init(void);
extern void page_fault(int n, istate_t *istate);
#endif /* __ASM__ */
#endif /* KERNEL */
#endif
/** @}
*/