/*
* Copyright (C) 2003-2004 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 __mips32_PAGE_H__
#define __mips32_PAGE_H__
#include <arch/mm/frame.h>
#define PAGE_WIDTH FRAME_WIDTH
#define PAGE_SIZE FRAME_SIZE
#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
#ifdef KERNEL
/*
* Implementation of generic 4-level page table interface.
* NOTE: this implementation is under construction
*
* Page table layout:
* - 32-bit virtual addresses
* - Offset is 14 bits => pages are 16K long
* - PTE's use similar format as CP0 EntryLo[01] registers => PTE is therefore 4 bytes long
* - PTE's replace EntryLo v (valid) bit with p (present) bit
* - PTE's use only one bit to distinguish between cacheable and uncacheable mappings
* - PTE's define soft_valid field to ensure there is at least one 1 bit even if the p bit is cleared
* - PTE's make use of CP0 EntryLo's two-bit reserved field for bit W (writable) and bit A (accessed)
* - PTL0 has 64 entries (6 bits)
* - PTL1 is not used
* - PTL2 is not used
* - PTL3 has 4096 entries (12 bits)
*/
#define PTL0_ENTRIES_ARCH 64
#define PTL1_ENTRIES_ARCH 0
#define PTL2_ENTRIES_ARCH 0
#define PTL3_ENTRIES_ARCH 4096
#define PTL0_INDEX_ARCH(vaddr) ((vaddr)>>26)
#define PTL1_INDEX_ARCH(vaddr) 0
#define PTL2_INDEX_ARCH(vaddr) 0
#define PTL3_INDEX_ARCH(vaddr) (((vaddr)>>14)&0x3fff)
#define SET_PTL0_ADDRESS_ARCH(ptl0)
#define GET_PTL1_ADDRESS_ARCH(ptl0, i) (((pte_t *)(ptl0))[(i)].pfn<<12)
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1)
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2)
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) (((pte_t *)(ptl3))[(i)].pfn<<12)
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_t *)(ptl0))[(i)].pfn = (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)].pfn = (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(pte) (*((__u32 *) (pte)) != 0)
#define PTE_PRESENT_ARCH(pte) ((pte)->p != 0)
#define PTE_GET_FRAME_ARCH(pte) ((pte)->pfn<<FRAME_WIDTH)
#ifndef __ASM__
#include <arch/mm/tlb.h>
#include <mm/page.h>
#include <arch/mm/frame.h>
#include <arch/types.h>
static inline int get_pt_flags(pte_t *pt, index_t i)
{
pte_t *p = &pt[i];
return (
(p->cacheable<<PAGE_CACHEABLE_SHIFT) |
((!p->p)<<PAGE_PRESENT_SHIFT) |
(1<<PAGE_USER_SHIFT) |
(1<<PAGE_READ_SHIFT) |
((p->w)<<PAGE_WRITE_SHIFT) |
(1<<PAGE_EXEC_SHIFT) |
(p->g<<PAGE_GLOBAL_SHIFT)
);
}
static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
{
pte_t *p = &pt[i];
p->cacheable = (flags & PAGE_CACHEABLE) != 0;
p->p = !(flags & PAGE_NOT_PRESENT);
p->g = (flags & PAGE_GLOBAL) != 0;
p->w = (flags & PAGE_WRITE) != 0;
/*
* Ensure that valid entries have at least one bit set.
*/
p->soft_valid = 1;
}
extern void page_arch_init(void);
#endif /* __ASM__ */
#endif /* KERNEL */
#endif