Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 #ifndef _SOS_PHYSMEM_H_ 018 #ifndef _SOS_PHYSMEM_H_ 019 #define _SOS_PHYSMEM_H_ 019 #define _SOS_PHYSMEM_H_ 020 020 021 /** 021 /** 022 * @file physmem.h 022 * @file physmem.h 023 * 023 * 024 * Physical pages of memory 024 * Physical pages of memory 025 */ 025 */ 026 026 027 #include <sos/errno.h> 027 #include <sos/errno.h> 028 #include <sos/types.h> 028 #include <sos/types.h> 029 #include <sos/macros.h> 029 #include <sos/macros.h> 030 030 031 /** The size of a physical page (arch-dependen 031 /** The size of a physical page (arch-dependent) */ 032 #define SOS_PAGE_SIZE (4*1024) 032 #define SOS_PAGE_SIZE (4*1024) 033 033 034 /** The corresponding shift */ 034 /** The corresponding shift */ 035 #define SOS_PAGE_SHIFT 12 /* 4 kB = 2^12 B */ 035 #define SOS_PAGE_SHIFT 12 /* 4 kB = 2^12 B */ 036 036 037 /** The corresponding mask */ 037 /** The corresponding mask */ 038 #define SOS_PAGE_MASK ((1<<12) - 1) 038 #define SOS_PAGE_MASK ((1<<12) - 1) 039 039 040 #define SOS_PAGE_ALIGN_INF(val) \ !! 040 #define SOS_PAGE_ALIGN_INF(val) \ 041 SOS_ALIGN_INF((val), SOS_PAGE_SIZE) 041 SOS_ALIGN_INF((val), SOS_PAGE_SIZE) 042 #define SOS_PAGE_ALIGN_SUP(val) \ !! 042 #define SOS_PAGE_ALIGN_SUP(val) \ 043 SOS_ALIGN_SUP((val), SOS_PAGE_SIZE) 043 SOS_ALIGN_SUP((val), SOS_PAGE_SIZE) 044 !! 044 #define SOS_IS_PAGE_ALIGNED(val) \ >> 045 SOS_IS_ALIGNED((val), SOS_PAGE_SIZE) 045 046 046 /** 047 /** 047 * This is the reserved physical interval for 048 * This is the reserved physical interval for the x86 video memory and 048 * BIOS area. In physmem.c, we have to mark th 049 * BIOS area. In physmem.c, we have to mark this area as "used" in 049 * order to prevent from allocating it. And in 050 * order to prevent from allocating it. And in paging.c, we'd better 050 * map it in virtual space if we really want t 051 * map it in virtual space if we really want to be able to print to 051 * the screen (for debugging purpose, at least 052 * the screen (for debugging purpose, at least): for this, the 052 * simplest is to identity-map this area in vi 053 * simplest is to identity-map this area in virtual space (note 053 * however that this mapping could also be non 054 * however that this mapping could also be non-identical). 054 */ 055 */ 055 #define BIOS_N_VIDEO_START 0xa0000 056 #define BIOS_N_VIDEO_START 0xa0000 056 #define BIOS_N_VIDEO_END 0x100000 057 #define BIOS_N_VIDEO_END 0x100000 057 058 058 059 059 /** 060 /** 060 * Initialize the physical memory subsystem, f 061 * Initialize the physical memory subsystem, for the physical area [0, 061 * ram_size). This routine takes into account 062 * ram_size). This routine takes into account the BIOS and video 062 * areas, to prevent them from future allocati 063 * areas, to prevent them from future allocations. 063 * 064 * 064 * @param ram_size The size of the RAM that wi 065 * @param ram_size The size of the RAM that will be managed by this subsystem 065 * 066 * 066 * @param kernel_core_base The lowest address 067 * @param kernel_core_base The lowest address for which the kernel 067 * assumes identity mapping (ie virtual addres 068 * assumes identity mapping (ie virtual address == physical address) 068 * will be stored here 069 * will be stored here 069 * 070 * 070 * @param kernel_core_top The top address for 071 * @param kernel_core_top The top address for which the kernel 071 * assumes identity mapping (ie virtual addres 072 * assumes identity mapping (ie virtual address == physical address) 072 * will be stored here 073 * will be stored here 073 */ 074 */ 074 sos_ret_t sos_physmem_setup(sos_size_t ram_siz !! 075 sos_ret_t sos_physmem_subsystem_setup(sos_size_t ram_size, 075 /* out */sos_paddr !! 076 /* out */sos_paddr_t *kernel_core_base, 076 /* out */sos_paddr !! 077 /* out */sos_paddr_t *kernel_core_top); 077 078 078 /** 079 /** 079 * Retrieve the total number of pages, and the 080 * Retrieve the total number of pages, and the number of free pages 080 */ 081 */ 081 sos_ret_t sos_physmem_get_state(/* out */sos_c 082 sos_ret_t sos_physmem_get_state(/* out */sos_count_t *total_ppages, 082 /* out */sos_c 083 /* out */sos_count_t *used_ppages); 083 084 084 085 085 /** 086 /** 086 * Get a free page. 087 * Get a free page. 087 * 088 * 088 * @return The (physical) address of the (phys 089 * @return The (physical) address of the (physical) page allocated, or 089 * NULL when none currently available. 090 * NULL when none currently available. 090 * 091 * 091 * @param can_block TRUE if the function is al 092 * @param can_block TRUE if the function is allowed to block 092 * @note The page returned has a reference cou 093 * @note The page returned has a reference count equal to 1. 093 */ 094 */ 094 sos_paddr_t sos_physmem_ref_physpage_new(sos_b 095 sos_paddr_t sos_physmem_ref_physpage_new(sos_bool_t can_block); 095 096 096 097 097 /** 098 /** 098 * Increment the reference count of a given ph 099 * Increment the reference count of a given physical page. Useful for 099 * VM code which tries to map a precise physic 100 * VM code which tries to map a precise physical address. 100 * 101 * >> 102 * @param ppage_paddr Physical address of the page (MUST be page-aligned) >> 103 * 101 * @return TRUE when the page was previously i 104 * @return TRUE when the page was previously in use, FALSE when the 102 * page was previously in the free list, <0 wh 105 * page was previously in the free list, <0 when the page address is 103 * invalid. 106 * invalid. 104 */ 107 */ 105 sos_ret_t sos_physmem_ref_physpage_at(sos_padd 108 sos_ret_t sos_physmem_ref_physpage_at(sos_paddr_t ppage_paddr); 106 109 107 110 108 /** 111 /** 109 * Decrement the reference count of the given 112 * Decrement the reference count of the given physical page. When this 110 * reference count reaches 0, the page is mark 113 * reference count reaches 0, the page is marked free, ie is available 111 * for future sos_physmem_get_physpage() 114 * for future sos_physmem_get_physpage() 112 * 115 * >> 116 * @param ppage_paddr Physical address of the page (MUST be page-aligned) >> 117 * 113 * @return FALSE when the page is still in use 118 * @return FALSE when the page is still in use, TRUE when the page is now 114 * unreferenced, <0 when the page address is i 119 * unreferenced, <0 when the page address is invalid 115 */ 120 */ 116 sos_ret_t sos_physmem_unref_physpage(sos_paddr 121 sos_ret_t sos_physmem_unref_physpage(sos_paddr_t ppage_paddr); 117 122 >> 123 >> 124 #include <sos/kmem_vmm.h> >> 125 >> 126 /** >> 127 * Return the kernel memory allocation range associated with the given >> 128 * physical page, or NULL when page has no associated range >> 129 * >> 130 * @param ppage_paddr Physical address of the page (MUST be page-aligned) >> 131 */ >> 132 struct sos_kmem_range* sos_physmem_get_kmem_range(sos_paddr_t ppage_paddr); >> 133 >> 134 >> 135 /** >> 136 * Set the kernel memory allocation range associated to the given >> 137 * physical page. >> 138 * >> 139 * @param ppage_paddr Physical address of the page (MUST be page-aligned) >> 140 * >> 141 * @return error if page is invalid >> 142 */ >> 143 sos_ret_t sos_physmem_set_kmem_range(sos_paddr_t ppage_paddr, >> 144 struct sos_kmem_range *range); 118 145 119 #endif /* _SOS_PHYSMEM_H_ */ 146 #endif /* _SOS_PHYSMEM_H_ */
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |