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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny >> 002 Copyright (C) 2000 The KOS Team 002 003 003 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 007 008 008 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 012 GNU General Public License for more details. 012 013 013 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 USA. 017 */ 018 */ 018 #include <sos/list.h> 019 #include <sos/list.h> 019 #include <sos/macros.h> 020 #include <sos/macros.h> 020 #include <sos/assert.h> 021 #include <sos/assert.h> 021 #include <sos/klibc.h> 022 #include <sos/klibc.h> 022 023 023 #include "physmem.h" 024 #include "physmem.h" 024 025 025 /** A descriptor for a physical page in SOS */ 026 /** A descriptor for a physical page in SOS */ 026 struct physical_page_descr 027 struct physical_page_descr 027 { 028 { 028 /** The physical base address for the page * 029 /** The physical base address for the page */ 029 sos_paddr_t paddr; 030 sos_paddr_t paddr; 030 031 031 /** The reference count for this physical pa 032 /** The reference count for this physical page. > 0 means that the 032 page is in the used list. */ 033 page is in the used list. */ 033 sos_count_t ref_cnt; 034 sos_count_t ref_cnt; 034 035 035 /** Some data associated with the page when 036 /** Some data associated with the page when it is mapped in kernel space */ 036 struct sos_kmem_range *kernel_range; 037 struct sos_kmem_range *kernel_range; 037 038 038 /** The other pages on the list (used, free) 039 /** The other pages on the list (used, free) */ 039 struct physical_page_descr *prev, *next; 040 struct physical_page_descr *prev, *next; 040 }; 041 }; 041 042 042 /** These are some markers present in the exec 043 /** These are some markers present in the executable file (see sos.lds) */ 043 extern char __b_kernel, __e_kernel; 044 extern char __b_kernel, __e_kernel; 044 045 045 /** The array of ppage descriptors will be loc 046 /** The array of ppage descriptors will be located at this address */ 046 #define PAGE_DESCR_ARRAY_ADDR \ 047 #define PAGE_DESCR_ARRAY_ADDR \ 047 SOS_PAGE_ALIGN_SUP((sos_paddr_t) (& __e_kern 048 SOS_PAGE_ALIGN_SUP((sos_paddr_t) (& __e_kernel)) 048 static struct physical_page_descr * physical_p 049 static struct physical_page_descr * physical_page_descr_array; 049 050 050 /** The list of physical pages currently avail 051 /** The list of physical pages currently available */ 051 static struct physical_page_descr *free_ppage; 052 static struct physical_page_descr *free_ppage; 052 053 053 /** The list of physical pages currently in us 054 /** The list of physical pages currently in use */ 054 static struct physical_page_descr *used_ppage; 055 static struct physical_page_descr *used_ppage; 055 056 056 /** We will store here the interval of valid p 057 /** We will store here the interval of valid physical addresses */ 057 static sos_paddr_t physmem_base, physmem_top; 058 static sos_paddr_t physmem_base, physmem_top; 058 059 059 /** We store the number of pages used/free */ 060 /** We store the number of pages used/free */ 060 static sos_count_t physmem_total_pages, physme 061 static sos_count_t physmem_total_pages, physmem_used_pages; 061 062 062 sos_ret_t sos_physmem_setup(sos_size_t ram_siz !! 063 sos_ret_t sos_physmem_subsystem_setup(sos_size_t ram_size, 063 /* out */sos_paddr !! 064 /* out */sos_paddr_t *kernel_core_base, 064 /* out */sos_paddr !! 065 /* out */sos_paddr_t *kernel_core_top) 065 { 066 { 066 /* The iterator over the page descriptors */ 067 /* The iterator over the page descriptors */ 067 struct physical_page_descr *ppage_descr; 068 struct physical_page_descr *ppage_descr; 068 069 069 /* The iterator over the physical addresses 070 /* The iterator over the physical addresses */ 070 sos_paddr_t ppage_addr; 071 sos_paddr_t ppage_addr; 071 072 072 /* Make sure ram size is aligned on a page b 073 /* Make sure ram size is aligned on a page boundary */ 073 ram_size = SOS_PAGE_ALIGN_INF(ram_size);/* Y 074 ram_size = SOS_PAGE_ALIGN_INF(ram_size);/* Yes, we may lose at most a page */ 074 075 075 /* Reset the used/free page lists before bui 076 /* Reset the used/free page lists before building them */ 076 free_ppage = used_ppage = NULL; 077 free_ppage = used_ppage = NULL; 077 physmem_total_pages = physmem_used_pages = 0 078 physmem_total_pages = physmem_used_pages = 0; 078 079 079 /* Make sure that there is enough memory to 080 /* Make sure that there is enough memory to store the array of page 080 descriptors */ 081 descriptors */ 081 *kernel_core_base = SOS_PAGE_ALIGN_INF((sos_ 082 *kernel_core_base = SOS_PAGE_ALIGN_INF((sos_paddr_t)(& __b_kernel)); 082 *kernel_core_top 083 *kernel_core_top 083 = PAGE_DESCR_ARRAY_ADDR 084 = PAGE_DESCR_ARRAY_ADDR 084 + SOS_PAGE_ALIGN_SUP( (ram_size >> SOS_P 085 + SOS_PAGE_ALIGN_SUP( (ram_size >> SOS_PAGE_SHIFT) 085 * sizeof(struct ph 086 * sizeof(struct physical_page_descr)); 086 if (*kernel_core_top > ram_size) 087 if (*kernel_core_top > ram_size) 087 return -SOS_ENOMEM; 088 return -SOS_ENOMEM; 088 089 089 /* Page 0-4kB is not available in order to r 090 /* Page 0-4kB is not available in order to return address 0 as a 090 means to signal "no page available" */ 091 means to signal "no page available" */ 091 physmem_base = SOS_PAGE_SIZE; 092 physmem_base = SOS_PAGE_SIZE; 092 physmem_top = ram_size; 093 physmem_top = ram_size; 093 094 094 /* Setup the page descriptor arrray */ 095 /* Setup the page descriptor arrray */ 095 physical_page_descr_array 096 physical_page_descr_array 096 = (struct physical_page_descr*)PAGE_DESCR_ 097 = (struct physical_page_descr*)PAGE_DESCR_ARRAY_ADDR; 097 098 098 /* Scan the list of physical pages */ 099 /* Scan the list of physical pages */ 099 for (ppage_addr = 0, 100 for (ppage_addr = 0, 100 ppage_descr = physical_page_descr_arr 101 ppage_descr = physical_page_descr_array ; 101 ppage_addr < physmem_top ; 102 ppage_addr < physmem_top ; 102 ppage_addr += SOS_PAGE_SIZE, 103 ppage_addr += SOS_PAGE_SIZE, 103 ppage_descr ++) 104 ppage_descr ++) 104 { 105 { 105 enum { PPAGE_MARK_RESERVED, PPAGE_MARK_F 106 enum { PPAGE_MARK_RESERVED, PPAGE_MARK_FREE, 106 PPAGE_MARK_KERNEL, PPAGE_MARK_HWM 107 PPAGE_MARK_KERNEL, PPAGE_MARK_HWMAP } todo; 107 108 108 memset(ppage_descr, 0x0, sizeof(struct p 109 memset(ppage_descr, 0x0, sizeof(struct physical_page_descr)); 109 110 110 /* Init the page descriptor for this pag 111 /* Init the page descriptor for this page */ 111 ppage_descr->paddr = ppage_addr; 112 ppage_descr->paddr = ppage_addr; 112 113 113 /* Reserved : 0 ... base */ 114 /* Reserved : 0 ... base */ 114 if (ppage_addr < physmem_base) 115 if (ppage_addr < physmem_base) 115 todo = PPAGE_MARK_RESERVED; 116 todo = PPAGE_MARK_RESERVED; 116 117 117 /* Free : base ... BIOS */ 118 /* Free : base ... BIOS */ 118 else if ((ppage_addr >= physmem_base) 119 else if ((ppage_addr >= physmem_base) 119 && (ppage_addr < BIOS_N_VIDEO_S 120 && (ppage_addr < BIOS_N_VIDEO_START)) 120 todo = PPAGE_MARK_FREE; 121 todo = PPAGE_MARK_FREE; 121 122 122 /* Used : BIOS */ 123 /* Used : BIOS */ 123 else if ((ppage_addr >= BIOS_N_VIDEO_STA 124 else if ((ppage_addr >= BIOS_N_VIDEO_START) 124 && (ppage_addr < BIOS_N_VIDEO_E 125 && (ppage_addr < BIOS_N_VIDEO_END)) 125 todo = PPAGE_MARK_HWMAP; 126 todo = PPAGE_MARK_HWMAP; 126 127 127 /* Free : BIOS ... kernel */ 128 /* Free : BIOS ... kernel */ 128 else if ((ppage_addr >= BIOS_N_VIDEO_END 129 else if ((ppage_addr >= BIOS_N_VIDEO_END) 129 && (ppage_addr < (sos_paddr_t) 130 && (ppage_addr < (sos_paddr_t) (& __b_kernel))) 130 todo = PPAGE_MARK_FREE; 131 todo = PPAGE_MARK_FREE; 131 132 132 /* Used : Kernel code/data/bss + physcal 133 /* Used : Kernel code/data/bss + physcal page descr array */ 133 else if ((ppage_addr >= *kernel_core_bas 134 else if ((ppage_addr >= *kernel_core_base) 134 && (ppage_addr < *kernel_core_ 135 && (ppage_addr < *kernel_core_top)) 135 todo = PPAGE_MARK_KERNEL; 136 todo = PPAGE_MARK_KERNEL; 136 137 137 /* Free : first page of descr ... end of 138 /* Free : first page of descr ... end of RAM */ 138 else 139 else 139 todo = PPAGE_MARK_FREE; 140 todo = PPAGE_MARK_FREE; 140 141 141 /* Actually does the insertion in the us 142 /* Actually does the insertion in the used/free page lists */ 142 physmem_total_pages ++; 143 physmem_total_pages ++; 143 switch (todo) 144 switch (todo) 144 { 145 { 145 case PPAGE_MARK_FREE: 146 case PPAGE_MARK_FREE: 146 ppage_descr->ref_cnt = 0; 147 ppage_descr->ref_cnt = 0; 147 list_add_head(free_ppage, ppage_desc 148 list_add_head(free_ppage, ppage_descr); 148 break; 149 break; 149 150 150 case PPAGE_MARK_KERNEL: 151 case PPAGE_MARK_KERNEL: 151 case PPAGE_MARK_HWMAP: 152 case PPAGE_MARK_HWMAP: 152 ppage_descr->ref_cnt = 1; 153 ppage_descr->ref_cnt = 1; 153 list_add_head(used_ppage, ppage_desc 154 list_add_head(used_ppage, ppage_descr); 154 physmem_used_pages ++; 155 physmem_used_pages ++; 155 break; 156 break; 156 157 157 default: 158 default: 158 /* Reserved page: nop */ 159 /* Reserved page: nop */ 159 break; 160 break; 160 } 161 } 161 } 162 } 162 163 163 return SOS_OK; 164 return SOS_OK; 164 } 165 } 165 166 166 167 167 sos_paddr_t sos_physmem_ref_physpage_new(sos_b 168 sos_paddr_t sos_physmem_ref_physpage_new(sos_bool_t can_block) 168 { 169 { 169 struct physical_page_descr *ppage_descr; 170 struct physical_page_descr *ppage_descr; 170 171 171 if (! free_ppage) 172 if (! free_ppage) 172 return (sos_paddr_t)NULL; 173 return (sos_paddr_t)NULL; 173 174 174 /* Retrieve a page in the free list */ 175 /* Retrieve a page in the free list */ 175 ppage_descr = list_pop_head(free_ppage); 176 ppage_descr = list_pop_head(free_ppage); 176 177 177 /* The page is assumed not to be already use 178 /* The page is assumed not to be already used */ 178 SOS_ASSERT_FATAL(ppage_descr->ref_cnt == 0); 179 SOS_ASSERT_FATAL(ppage_descr->ref_cnt == 0); 179 180 180 /* Mark the page as used (this of course set 181 /* Mark the page as used (this of course sets the ref count to 1) */ 181 ppage_descr->ref_cnt ++; 182 ppage_descr->ref_cnt ++; 182 183 183 /* No associated kernel range by default */ 184 /* No associated kernel range by default */ 184 ppage_descr->kernel_range = NULL; 185 ppage_descr->kernel_range = NULL; 185 186 186 /* Put the page in the used list */ 187 /* Put the page in the used list */ 187 list_add_tail(used_ppage, ppage_descr); 188 list_add_tail(used_ppage, ppage_descr); 188 physmem_used_pages ++; 189 physmem_used_pages ++; 189 190 190 return ppage_descr->paddr; 191 return ppage_descr->paddr; 191 } 192 } 192 193 193 194 194 /** 195 /** 195 * Helper function to get the physical page de 196 * Helper function to get the physical page descriptor for the given 196 * physical page address. 197 * physical page address. 197 * 198 * 198 * @return NULL when out-of-bounds or non-page 199 * @return NULL when out-of-bounds or non-page-aligned 199 */ 200 */ 200 inline static struct physical_page_descr * 201 inline static struct physical_page_descr * 201 get_page_descr_at_paddr(sos_paddr_t ppage_padd 202 get_page_descr_at_paddr(sos_paddr_t ppage_paddr) 202 { 203 { 203 /* Don't handle non-page-aligned addresses * 204 /* Don't handle non-page-aligned addresses */ 204 if (ppage_paddr & SOS_PAGE_MASK) 205 if (ppage_paddr & SOS_PAGE_MASK) 205 return NULL; 206 return NULL; 206 207 207 /* Don't support out-of-bounds requests */ 208 /* Don't support out-of-bounds requests */ 208 if ((ppage_paddr < physmem_base) || (ppage_p 209 if ((ppage_paddr < physmem_base) || (ppage_paddr >= physmem_top)) 209 return NULL; 210 return NULL; 210 211 211 return physical_page_descr_array + (ppage_pa 212 return physical_page_descr_array + (ppage_paddr >> SOS_PAGE_SHIFT); 212 } 213 } 213 214 214 215 215 sos_ret_t sos_physmem_ref_physpage_at(sos_padd 216 sos_ret_t sos_physmem_ref_physpage_at(sos_paddr_t ppage_paddr) 216 { 217 { 217 struct physical_page_descr *ppage_descr 218 struct physical_page_descr *ppage_descr 218 = get_page_descr_at_paddr(ppage_paddr); 219 = get_page_descr_at_paddr(ppage_paddr); 219 220 220 if (! ppage_descr) 221 if (! ppage_descr) 221 return -SOS_EINVAL; 222 return -SOS_EINVAL; 222 223 223 /* Increment the reference count for the pag 224 /* Increment the reference count for the page */ 224 ppage_descr->ref_cnt ++; 225 ppage_descr->ref_cnt ++; 225 226 226 /* If the page is newly referenced (ie we ar 227 /* If the page is newly referenced (ie we are the only owners of the 227 page => ref cnt == 1), transfer it in the 228 page => ref cnt == 1), transfer it in the used pages list */ 228 if (ppage_descr->ref_cnt == 1) 229 if (ppage_descr->ref_cnt == 1) 229 { 230 { 230 list_delete(free_ppage, ppage_descr); 231 list_delete(free_ppage, ppage_descr); 231 232 232 /* No associated kernel range by default 233 /* No associated kernel range by default */ 233 ppage_descr->kernel_range = NULL; 234 ppage_descr->kernel_range = NULL; 234 235 235 list_add_tail(used_ppage, ppage_descr); 236 list_add_tail(used_ppage, ppage_descr); 236 physmem_used_pages ++; 237 physmem_used_pages ++; 237 238 238 /* The page is newly referenced */ 239 /* The page is newly referenced */ 239 return FALSE; 240 return FALSE; 240 } 241 } 241 242 242 /* The page was already referenced by someon 243 /* The page was already referenced by someone */ 243 return TRUE; 244 return TRUE; 244 } 245 } 245 246 246 247 247 sos_ret_t 248 sos_ret_t 248 sos_physmem_unref_physpage(sos_paddr_t ppage_p 249 sos_physmem_unref_physpage(sos_paddr_t ppage_paddr) 249 { 250 { 250 /* By default the return value indicates tha 251 /* By default the return value indicates that the page is still 251 used */ 252 used */ 252 sos_ret_t retval = FALSE; 253 sos_ret_t retval = FALSE; 253 254 254 struct physical_page_descr *ppage_descr 255 struct physical_page_descr *ppage_descr 255 = get_page_descr_at_paddr(ppage_paddr); 256 = get_page_descr_at_paddr(ppage_paddr); 256 257 257 if (! ppage_descr) 258 if (! ppage_descr) 258 return -SOS_EINVAL; 259 return -SOS_EINVAL; 259 260 260 /* Don't do anything if the page is not in t 261 /* Don't do anything if the page is not in the used list */ 261 if (ppage_descr->ref_cnt <= 0) 262 if (ppage_descr->ref_cnt <= 0) 262 return -SOS_EINVAL; 263 return -SOS_EINVAL; 263 264 264 /* Unreference the page, and, when no mappin 265 /* Unreference the page, and, when no mapping is active anymore, put 265 the page in the free list */ 266 the page in the free list */ 266 ppage_descr->ref_cnt--; 267 ppage_descr->ref_cnt--; 267 if (ppage_descr->ref_cnt <= 0) 268 if (ppage_descr->ref_cnt <= 0) 268 { 269 { 269 /* Reset associated kernel range */ 270 /* Reset associated kernel range */ 270 ppage_descr->kernel_range = NULL; 271 ppage_descr->kernel_range = NULL; 271 272 272 /* Transfer the page, considered USED, t 273 /* Transfer the page, considered USED, to the free list */ 273 list_delete(used_ppage, ppage_descr); 274 list_delete(used_ppage, ppage_descr); 274 physmem_used_pages --; 275 physmem_used_pages --; 275 list_add_head(free_ppage, ppage_descr); 276 list_add_head(free_ppage, ppage_descr); 276 277 277 /* Indicate that the page is now unrefer 278 /* Indicate that the page is now unreferenced */ 278 retval = TRUE; 279 retval = TRUE; 279 } 280 } 280 281 281 return retval; 282 return retval; 282 } 283 } 283 284 284 285 285 struct sos_kmem_range* sos_physmem_get_kmem_ra 286 struct sos_kmem_range* sos_physmem_get_kmem_range(sos_paddr_t ppage_paddr) 286 { 287 { 287 struct physical_page_descr *ppage_descr 288 struct physical_page_descr *ppage_descr 288 = get_page_descr_at_paddr(ppage_paddr); 289 = get_page_descr_at_paddr(ppage_paddr); 289 290 290 if (! ppage_descr) 291 if (! ppage_descr) 291 return NULL; 292 return NULL; 292 293 293 return ppage_descr->kernel_range; 294 return ppage_descr->kernel_range; 294 } 295 } 295 296 296 297 297 sos_ret_t sos_physmem_set_kmem_range(sos_paddr 298 sos_ret_t sos_physmem_set_kmem_range(sos_paddr_t ppage_paddr, 298 struct so 299 struct sos_kmem_range *range) 299 { 300 { 300 struct physical_page_descr *ppage_descr 301 struct physical_page_descr *ppage_descr 301 = get_page_descr_at_paddr(ppage_paddr); 302 = get_page_descr_at_paddr(ppage_paddr); 302 303 303 if (! ppage_descr) 304 if (! ppage_descr) 304 return -SOS_EINVAL; 305 return -SOS_EINVAL; 305 306 306 ppage_descr->kernel_range = range; 307 ppage_descr->kernel_range = range; 307 return SOS_OK; 308 return SOS_OK; 308 } 309 } 309 310 310 sos_ret_t sos_physmem_get_state(/* out */sos_c 311 sos_ret_t sos_physmem_get_state(/* out */sos_count_t *total_ppages, 311 /* out */sos_c 312 /* out */sos_count_t *used_ppages) 312 { 313 { 313 if (total_ppages) 314 if (total_ppages) 314 *total_ppages = physmem_total_pages; 315 *total_ppages = physmem_total_pages; 315 if (used_ppages) 316 if (used_ppages) 316 *used_ppages = physmem_used_pages; 317 *used_ppages = physmem_used_pages; 317 return SOS_OK; 318 return SOS_OK; 318 } 319 }
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