1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 2000 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 10 */ 11 #include <linux/config.h> 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/signal.h> 15 #include <linux/sched.h> 16 #include <linux/kernel.h> 17 #include <linux/errno.h> 18 #include <linux/string.h> 19 #include <linux/types.h> 20 #include <linux/pagemap.h> 21 #include <linux/ptrace.h> 22 #include <linux/mman.h> 23 #include <linux/mm.h> 24 #include <linux/bootmem.h> 25 #include <linux/highmem.h> 26 #include <linux/swap.h> 27 #include <linux/proc_fs.h> 28 29 #include <asm/bootinfo.h> 30 #include <asm/cachectl.h> 31 #include <asm/cpu.h> 32 #include <asm/dma.h> 33 #include <asm/mmu_context.h> 34 #include <asm/sections.h> 35 #include <asm/pgtable.h> 36 #include <asm/pgalloc.h> 37 #include <asm/tlb.h> 38 39 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 40 41 unsigned long highstart_pfn, highend_pfn; 42 43 /* 44 * We have up to 8 empty zeroed pages so we can map one of the right colour 45 * when needed. This is necessary only on R4000 / R4400 SC and MC versions 46 * where we have to avoid VCED / VECI exceptions for good performance at 47 * any price. Since page is never written to after the initialization we 48 * don't have to care about aliases on other CPUs. 49 */ 50 unsigned long empty_zero_page, zero_page_mask; 51 52 /* 53 * Not static inline because used by IP27 special magic initialization code 54 */ 55 unsigned long setup_zero_pages(void) 56 { 57 unsigned int order; 58 unsigned long size; 59 struct page *page; 60 61 if (cpu_has_vce) 62 order = 3; 63 else 64 order = 0; 65 66 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 67 if (!empty_zero_page) 68 panic("Oh boy, that early out of memory?"); 69 70 page = virt_to_page(empty_zero_page); 71 split_page(page, order); 72 while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { 73 SetPageReserved(page); 74 page++; 75 } 76 77 size = PAGE_SIZE << order; 78 zero_page_mask = (size - 1) & PAGE_MASK; 79 80 return 1UL << order; 81 } 82 83 #ifdef CONFIG_HIGHMEM 84 pte_t *kmap_pte; 85 pgprot_t kmap_prot; 86 87 #define kmap_get_fixmap_pte(vaddr) \ 88 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) 89 90 static void __init kmap_init(void) 91 { 92 unsigned long kmap_vstart; 93 94 /* cache the first kmap pte */ 95 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); 96 kmap_pte = kmap_get_fixmap_pte(kmap_vstart); 97 98 kmap_prot = PAGE_KERNEL; 99 } 100 101 #ifdef CONFIG_32BIT 102 void __init fixrange_init(unsigned long start, unsigned long end, 103 pgd_t *pgd_base) 104 { 105 pgd_t *pgd; 106 pud_t *pud; 107 pmd_t *pmd; 108 pte_t *pte; 109 int i, j, k; 110 unsigned long vaddr; 111 112 vaddr = start; 113 i = __pgd_offset(vaddr); 114 j = __pud_offset(vaddr); 115 k = __pmd_offset(vaddr); 116 pgd = pgd_base + i; 117 118 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 119 pud = (pud_t *)pgd; 120 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 121 pmd = (pmd_t *)pud; 122 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 123 if (pmd_none(*pmd)) { 124 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 125 set_pmd(pmd, __pmd(pte)); 126 if (pte != pte_offset_kernel(pmd, 0)) 127 BUG(); 128 } 129 vaddr += PMD_SIZE; 130 } 131 k = 0; 132 } 133 j = 0; 134 } 135 } 136 #endif /* CONFIG_32BIT */ 137 #endif /* CONFIG_HIGHMEM */ 138 139 #ifndef CONFIG_NEED_MULTIPLE_NODES 140 extern void pagetable_init(void); 141 142 void __init paging_init(void) 143 { 144 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; 145 unsigned long max_dma, high, low; 146 147 pagetable_init(); 148 149 #ifdef CONFIG_HIGHMEM 150 kmap_init(); 151 #endif 152 153 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; 154 low = max_low_pfn; 155 high = highend_pfn; 156 157 #ifdef CONFIG_ISA 158 if (low < max_dma) 159 zones_size[ZONE_DMA] = low; 160 else { 161 zones_size[ZONE_DMA] = max_dma; 162 zones_size[ZONE_NORMAL] = low - max_dma; 163 } 164 #else 165 zones_size[ZONE_DMA] = low; 166 #endif 167 #ifdef CONFIG_HIGHMEM 168 if (cpu_has_dc_aliases) { 169 printk(KERN_WARNING "This processor doesn't support highmem."); 170 if (high - low) 171 printk(" %ldk highmem ignored", high - low); 172 printk("\n"); 173 } else 174 zones_size[ZONE_HIGHMEM] = high - low; 175 #endif 176 177 free_area_init(zones_size); 178 } 179 180 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) 181 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 182 183 static inline int page_is_ram(unsigned long pagenr) 184 { 185 int i; 186 187 for (i = 0; i < boot_mem_map.nr_map; i++) { 188 unsigned long addr, end; 189 190 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 191 /* not usable memory */ 192 continue; 193 194 addr = PFN_UP(boot_mem_map.map[i].addr); 195 end = PFN_DOWN(boot_mem_map.map[i].addr + 196 boot_mem_map.map[i].size); 197 198 if (pagenr >= addr && pagenr < end) 199 return 1; 200 } 201 202 return 0; 203 } 204 205 static struct kcore_list kcore_mem, kcore_vmalloc; 206 #ifdef CONFIG_64BIT 207 static struct kcore_list kcore_kseg0; 208 #endif 209 210 void __init mem_init(void) 211 { 212 unsigned long codesize, reservedpages, datasize, initsize; 213 unsigned long tmp, ram; 214 215 #ifdef CONFIG_HIGHMEM 216 #ifdef CONFIG_DISCONTIGMEM 217 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" 218 #endif 219 max_mapnr = num_physpages = highend_pfn; 220 #else 221 max_mapnr = num_physpages = max_low_pfn; 222 #endif 223 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 224 225 totalram_pages += free_all_bootmem(); 226 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ 227 228 reservedpages = ram = 0; 229 for (tmp = 0; tmp < max_low_pfn; tmp++) 230 if (page_is_ram(tmp)) { 231 ram++; 232 if (PageReserved(mem_map+tmp)) 233 reservedpages++; 234 } 235 236 #ifdef CONFIG_HIGHMEM 237 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { 238 struct page *page = mem_map + tmp; 239 240 if (!page_is_ram(tmp)) { 241 SetPageReserved(page); 242 continue; 243 } 244 ClearPageReserved(page); 245 #ifdef CONFIG_LIMITED_DMA 246 set_page_address(page, lowmem_page_address(page)); 247 #endif 248 init_page_count(page); 249 __free_page(page); 250 totalhigh_pages++; 251 } 252 totalram_pages += totalhigh_pages; 253 #endif 254 255 codesize = (unsigned long) &_etext - (unsigned long) &_text; 256 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 257 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 258 259 #ifdef CONFIG_64BIT 260 if ((unsigned long) &_text > (unsigned long) CKSEG0) 261 /* The -4 is a hack so that user tools don't have to handle 262 the overflow. */ 263 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); 264 #endif 265 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 266 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 267 VMALLOC_END-VMALLOC_START); 268 269 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 270 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 271 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 272 ram << (PAGE_SHIFT-10), 273 codesize >> 10, 274 reservedpages << (PAGE_SHIFT-10), 275 datasize >> 10, 276 initsize >> 10, 277 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 278 } 279 #endif /* !CONFIG_NEED_MULTIPLE_NODES */ 280 281 #ifdef CONFIG_BLK_DEV_INITRD 282 void free_initrd_mem(unsigned long start, unsigned long end) 283 { 284 #ifdef CONFIG_64BIT 285 /* Switch from KSEG0 to XKPHYS addresses */ 286 start = (unsigned long)phys_to_virt(CPHYSADDR(start)); 287 end = (unsigned long)phys_to_virt(CPHYSADDR(end)); 288 #endif 289 if (start < end) 290 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", 291 (end - start) >> 10); 292 293 for (; start < end; start += PAGE_SIZE) { 294 ClearPageReserved(virt_to_page(start)); 295 init_page_count(virt_to_page(start)); 296 free_page(start); 297 totalram_pages++; 298 } 299 } 300 #endif 301 302 extern unsigned long prom_free_prom_memory(void); 303 304 void free_initmem(void) 305 { 306 unsigned long addr, page, freed; 307 308 freed = prom_free_prom_memory(); 309 310 addr = (unsigned long) &__init_begin; 311 while (addr < (unsigned long) &__init_end) { 312 #ifdef CONFIG_64BIT 313 page = PAGE_OFFSET | CPHYSADDR(addr); 314 #else 315 page = addr; 316 #endif 317 ClearPageReserved(virt_to_page(page)); 318 init_page_count(virt_to_page(page)); 319 free_page(page); 320 totalram_pages++; 321 freed += PAGE_SIZE; 322 addr += PAGE_SIZE; 323 } 324 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", 325 freed >> 10); 326 } 327