Index: kernel/arch/xen32/include/mm/page.h =================================================================== --- kernel/arch/xen32/include/mm/page.h (revision 983cd37421607bd0fcff257f1c42e6d26cae0ca0) +++ kernel/arch/xen32/include/mm/page.h (revision 983cd37421607bd0fcff257f1c42e6d26cae0ca0) @@ -0,0 +1,172 @@ +/* + * 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 xen32mm + * @{ + */ +/** @file + */ + +#ifndef __xen32_PAGE_H__ +#define __xen32_PAGE_H__ + +#include + +#define PAGE_WIDTH FRAME_WIDTH +#define PAGE_SIZE FRAME_SIZE + +#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. + */ +#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) ((uintptr_t)((((pte_t *)(ptl3))[(i)].frame_address)<<12)) + +#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) + +#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) (*((uint32_t *) (p)) != 0) +#define PTE_PRESENT_ARCH(p) ((p)->present != 0) +#define PTE_GET_FRAME_ARCH(p) ((p)->frame_address<writeable != 0) +#define PTE_EXECUTABLE_ARCH(p) 1 + +#ifndef __ASM__ + +#include +#include +#include +#include + +/* 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)<present)<uaccessible<writeable<global<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 + +/** @} + */