0,0 → 1,124 |
/* |
* 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. |
*/ |
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/** @addtogroup arm32mm |
* @{ |
*/ |
/** @file |
*/ |
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#ifndef __MM_H__ |
#define __MM_H__ |
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#include "types.h" |
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#define FRAME_WIDTH 12 /* 4KB frames */ |
#define FRAME_SIZE (1 << FRAME_WIDTH) |
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#define PAGE_WIDTH FRAME_WIDTH |
#define PAGE_SIZE FRAME_SIZE |
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#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 |
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#define SET_PTL0_ADDRESS_ARCH(ptl0) ( set_ptl0_addr((pte_level0_section *)(ptl0)) ) |
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/// User no acess, kernel read/write |
#define pte_ap_user_no_kernel_rw 1 |
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/// Frames per 1MB section |
#define FRAMES_PER_SECTION ( ( 1 << 20 ) / FRAME_SIZE ) |
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/// Converts Address to frame |
#define ADDR2PFN( addr ) ( ((uintptr_t)(addr))>>FRAME_WIDTH ) |
/** Value of descriptor_type in page table entry that signals |
* that this entry describe section |
*/ |
#define pte_descriptor_section 2 |
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/** Page Table Entry. */ |
typedef struct { |
/**PageTables are so different that we have different types |
* for level 0 and level1 page table entries |
*/ |
unsigned dummy : 32; |
} pte_t; |
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/** Page table level 0 entry - section format */ |
typedef struct { |
unsigned descriptor_type : 2; // should be 2 |
unsigned bufferable : 1; |
unsigned cacheable : 1; |
unsigned machine_depend : 1; // Alf: ???? v Architecture previev neni vyznam definovan |
unsigned domain : 4; |
unsigned should_be_zero_1 : 1; |
unsigned access_permission : 2; |
unsigned should_be_zero_2 : 8; |
unsigned section_base_addr : 12; |
} __attribute__ ((packed)) pte_level0_section; |
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/** Set adress of paging level 0 table |
* \param pt pointer to page table to set |
*/ |
static inline void set_ptl0_addr( pte_level0_section* pt) { |
asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
: |
: "r"(pt) |
); |
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} |
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/// Page table that holds 1:1 mapping for kernel starting |
extern pte_level0_section page_table[4096]; |
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/** Set page table entry to point no frame, be read/write by kernel, |
* no access by user, become to domain 0, no cache or buffer |
* \param pte page table entry to set |
* \param frame frame number of first frame 1MB section |
* Note: If frame not aligned it's used first lower 1MB aligned frame |
*/ |
void init_pte_level0_section_entry( pte_level0_section* pte, unsigned frame); |
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/// Sets memory mapping for kernel |
void mm_kernel_mapping(void); |
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#endif |
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/** @} |
*/ |
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