/* * Copyright (c) 2010 Martin Decky * 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 abs32lemm * @{ */ /** @file */ #ifndef KERN_abs32le_PAGE_H_ #define KERN_abs32le_PAGE_H_ #include #include #define PAGE_WIDTH FRAME_WIDTH #define PAGE_SIZE FRAME_SIZE #define KA2PA(x) (((uintptr_t) (x)) - UINT32_C(0x80000000)) #define PA2KA(x) (((uintptr_t) (x)) + UINT32_C(0x80000000)) /* * This is an example of 2-level page tables (PTL1 and PTL2 are left out) * on top of the generic 4-level page table interface. */ /* 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) & 0x3ffU) #define PTL1_INDEX_ARCH(vaddr) 0 #define PTL2_INDEX_ARCH(vaddr) 0 #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x3ffU) /* 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) #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), (size_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), (size_t) (i)) /* Set PTE flags accessors for each level. */ #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \ set_pt_flags((pte_t *) (ptl0), (size_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), (size_t) (i), (x)) /* Set PTE present bit accessors for each level. */ #define SET_PTL1_PRESENT_ARCH(ptl0, i) \ set_pt_present((pte_t *) (ptl0), (size_t) (i)) #define SET_PTL2_PRESENT_ARCH(ptl1, i) #define SET_PTL3_PRESENT_ARCH(ptl2, i) #define SET_FRAME_PRESENT_ARCH(ptl3, i) \ set_pt_present((pte_t *) (ptl3), (size_t) (i)) /* 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 #include #include #include /** Page Table Entry. */ typedef struct { unsigned int present : 1; unsigned int writeable : 1; unsigned int uaccessible : 1; unsigned int page_write_through : 1; unsigned int page_cache_disable : 1; unsigned int accessed : 1; unsigned int dirty : 1; unsigned int pat : 1; unsigned int global : 1; /** Valid content even if the present bit is not set. */ unsigned int soft_valid : 1; unsigned int avl : 2; unsigned int frame_address : 20; } __attribute__((packed)) pte_t; NO_TRACE static inline unsigned int get_pt_flags(pte_t *pt, size_t i) REQUIRES_ARRAY_MUTABLE(pt, PTL0_ENTRIES_ARCH) { pte_t *p = &pt[i]; return ( ((unsigned int) (!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT) | ((unsigned int) (!p->present) << PAGE_PRESENT_SHIFT) | ((unsigned int) p->uaccessible << PAGE_USER_SHIFT) | (1 << PAGE_READ_SHIFT) | ((unsigned int) p->writeable << PAGE_WRITE_SHIFT) | (1 << PAGE_EXEC_SHIFT) | ((unsigned int) p->global << PAGE_GLOBAL_SHIFT) ); } NO_TRACE static inline void set_pt_flags(pte_t *pt, size_t i, int flags) WRITES(ARRAY_RANGE(pt, PTL0_ENTRIES_ARCH)) REQUIRES_ARRAY_MUTABLE(pt, PTL0_ENTRIES_ARCH) { 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; } NO_TRACE static inline void set_pt_present(pte_t *pt, size_t i) WRITES(ARRAY_RANGE(pt, PTL0_ENTRIES_ARCH)) REQUIRES_ARRAY_MUTABLE(pt, PTL0_ENTRIES_ARCH) { pte_t *p = &pt[i]; p->present = 1; } extern void page_arch_init(void); extern void page_fault(unsigned int, istate_t *); #endif /** @} */