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/init.h> 12 #include <linux/module.h> 13 #include <linux/signal.h> 14 #include <linux/sched.h> 15 #include <linux/kernel.h> 16 #include <linux/errno.h> 17 #include <linux/string.h> 18 #include <linux/types.h> 19 #include <linux/pagemap.h> 20 #include <linux/ptrace.h> 21 #include <linux/mman.h> 22 #include <linux/mm.h> 23 #include <linux/bootmem.h> 24 #include <linux/highmem.h> 25 #include <linux/swap.h> 26 #include <linux/proc_fs.h> 27 #include <linux/pfn.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 static int __init page_is_ram(unsigned long pagenr) 143 { 144 int i; 145 146 for (i = 0; i < boot_mem_map.nr_map; i++) { 147 unsigned long addr, end; 148 149 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 150 /* not usable memory */ 151 continue; 152 153 addr = PFN_UP(boot_mem_map.map[i].addr); 154 end = PFN_DOWN(boot_mem_map.map[i].addr + 155 boot_mem_map.map[i].size); 156 157 if (pagenr >= addr && pagenr < end) 158 return 1; 159 } 160 161 return 0; 162 } 163 164 void __init paging_init(void) 165 { 166 unsigned long zones_size[] = { 0, }; 167 unsigned long max_dma, high, low; 168 #ifndef CONFIG_FLATMEM 169 unsigned long zholes_size[] = { 0, }; 170 unsigned long i, j, pfn; 171 #endif 172 173 pagetable_init(); 174 175 #ifdef CONFIG_HIGHMEM 176 kmap_init(); 177 #endif 178 179 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; 180 low = max_low_pfn; 181 high = highend_pfn; 182 183 #ifdef CONFIG_ISA 184 if (low < max_dma) 185 zones_size[ZONE_DMA] = low; 186 else { 187 zones_size[ZONE_DMA] = max_dma; 188 zones_size[ZONE_NORMAL] = low - max_dma; 189 } 190 #else 191 zones_size[ZONE_DMA] = low; 192 #endif 193 #ifdef CONFIG_HIGHMEM 194 if (cpu_has_dc_aliases) { 195 printk(KERN_WARNING "This processor doesn't support highmem."); 196 if (high - low) 197 printk(" %ldk highmem ignored", high - low); 198 printk("\n"); 199 } else 200 zones_size[ZONE_HIGHMEM] = high - low; 201 #endif 202 203 #ifdef CONFIG_FLATMEM 204 free_area_init(zones_size); 205 #else 206 pfn = 0; 207 for (i = 0; i < MAX_NR_ZONES; i++) 208 for (j = 0; j < zones_size[i]; j++, pfn++) 209 if (!page_is_ram(pfn)) 210 zholes_size[i]++; 211 free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size); 212 #endif 213 } 214 215 static struct kcore_list kcore_mem, kcore_vmalloc; 216 #ifdef CONFIG_64BIT 217 static struct kcore_list kcore_kseg0; 218 #endif 219 220 void __init mem_init(void) 221 { 222 unsigned long codesize, reservedpages, datasize, initsize; 223 unsigned long tmp, ram; 224 225 #ifdef CONFIG_HIGHMEM 226 #ifdef CONFIG_DISCONTIGMEM 227 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" 228 #endif 229 max_mapnr = highend_pfn; 230 #else 231 max_mapnr = max_low_pfn; 232 #endif 233 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 234 235 totalram_pages += free_all_bootmem(); 236 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ 237 238 reservedpages = ram = 0; 239 for (tmp = 0; tmp < max_low_pfn; tmp++) 240 if (page_is_ram(tmp)) { 241 ram++; 242 if (PageReserved(pfn_to_page(tmp))) 243 reservedpages++; 244 } 245 num_physpages = ram; 246 247 #ifdef CONFIG_HIGHMEM 248 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { 249 struct page *page = mem_map + tmp; 250 251 if (!page_is_ram(tmp)) { 252 SetPageReserved(page); 253 continue; 254 } 255 ClearPageReserved(page); 256 #ifdef CONFIG_LIMITED_DMA 257 set_page_address(page, lowmem_page_address(page)); 258 #endif 259 init_page_count(page); 260 __free_page(page); 261 totalhigh_pages++; 262 } 263 totalram_pages += totalhigh_pages; 264 num_physpages += totalhigh_pages; 265 #endif 266 267 codesize = (unsigned long) &_etext - (unsigned long) &_text; 268 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 269 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 270 271 #ifdef CONFIG_64BIT 272 if ((unsigned long) &_text > (unsigned long) CKSEG0) 273 /* The -4 is a hack so that user tools don't have to handle 274 the overflow. */ 275 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); 276 #endif 277 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 278 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 279 VMALLOC_END-VMALLOC_START); 280 281 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 282 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 283 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 284 ram << (PAGE_SHIFT-10), 285 codesize >> 10, 286 reservedpages << (PAGE_SHIFT-10), 287 datasize >> 10, 288 initsize >> 10, 289 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 290 } 291 #endif /* !CONFIG_NEED_MULTIPLE_NODES */ 292 293 void free_init_pages(char *what, unsigned long begin, unsigned long end) 294 { 295 unsigned long addr; 296 297 for (addr = begin; addr < end; addr += PAGE_SIZE) { 298 ClearPageReserved(virt_to_page(addr)); 299 init_page_count(virt_to_page(addr)); 300 memset((void *)addr, 0xcc, PAGE_SIZE); 301 free_page(addr); 302 totalram_pages++; 303 } 304 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); 305 } 306 307 #ifdef CONFIG_BLK_DEV_INITRD 308 void free_initrd_mem(unsigned long start, unsigned long end) 309 { 310 #ifdef CONFIG_64BIT 311 /* Switch from KSEG0 to XKPHYS addresses */ 312 start = (unsigned long)phys_to_virt(CPHYSADDR(start)); 313 end = (unsigned long)phys_to_virt(CPHYSADDR(end)); 314 #endif 315 free_init_pages("initrd memory", start, end); 316 } 317 #endif 318 319 extern unsigned long prom_free_prom_memory(void); 320 321 void free_initmem(void) 322 { 323 unsigned long start, end, freed; 324 325 freed = prom_free_prom_memory(); 326 if (freed) 327 printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed); 328 329 start = (unsigned long)(&__init_begin); 330 end = (unsigned long)(&__init_end); 331 #ifdef CONFIG_64BIT 332 start = PAGE_OFFSET | CPHYSADDR(start); 333 end = PAGE_OFFSET | CPHYSADDR(end); 334 #endif 335 free_init_pages("unused kernel memory", start, end); 336 } 337