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 long order, size; 58 struct page *page; 59 60 if (cpu_has_vce) 61 order = 3; 62 else 63 order = 0; 64 65 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 66 if (!empty_zero_page) 67 panic("Oh boy, that early out of memory?"); 68 69 page = virt_to_page(empty_zero_page); 70 while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { 71 SetPageReserved(page); 72 set_page_count(page, 1); 73 page++; 74 } 75 76 size = PAGE_SIZE << order; 77 zero_page_mask = (size - 1) & PAGE_MASK; 78 79 return 1UL << order; 80 } 81 82 #ifdef CONFIG_HIGHMEM 83 pte_t *kmap_pte; 84 pgprot_t kmap_prot; 85 86 #define kmap_get_fixmap_pte(vaddr) \ 87 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) 88 89 static void __init kmap_init(void) 90 { 91 unsigned long kmap_vstart; 92 93 /* cache the first kmap pte */ 94 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); 95 kmap_pte = kmap_get_fixmap_pte(kmap_vstart); 96 97 kmap_prot = PAGE_KERNEL; 98 } 99 100 #ifdef CONFIG_32BIT 101 void __init fixrange_init(unsigned long start, unsigned long end, 102 pgd_t *pgd_base) 103 { 104 pgd_t *pgd; 105 pud_t *pud; 106 pmd_t *pmd; 107 pte_t *pte; 108 int i, j, k; 109 unsigned long vaddr; 110 111 vaddr = start; 112 i = __pgd_offset(vaddr); 113 j = __pud_offset(vaddr); 114 k = __pmd_offset(vaddr); 115 pgd = pgd_base + i; 116 117 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 118 pud = (pud_t *)pgd; 119 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 120 pmd = (pmd_t *)pud; 121 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 122 if (pmd_none(*pmd)) { 123 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 124 set_pmd(pmd, __pmd(pte)); 125 if (pte != pte_offset_kernel(pmd, 0)) 126 BUG(); 127 } 128 vaddr += PMD_SIZE; 129 } 130 k = 0; 131 } 132 j = 0; 133 } 134 } 135 #endif /* CONFIG_32BIT */ 136 #endif /* CONFIG_HIGHMEM */ 137 138 #ifndef CONFIG_NEED_MULTIPLE_NODES 139 extern void pagetable_init(void); 140 141 void __init paging_init(void) 142 { 143 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; 144 unsigned long max_dma, high, low; 145 146 pagetable_init(); 147 148 #ifdef CONFIG_HIGHMEM 149 kmap_init(); 150 #endif 151 152 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; 153 low = max_low_pfn; 154 high = highend_pfn; 155 156 #ifdef CONFIG_ISA 157 if (low < max_dma) 158 zones_size[ZONE_DMA] = low; 159 else { 160 zones_size[ZONE_DMA] = max_dma; 161 zones_size[ZONE_NORMAL] = low - max_dma; 162 } 163 #else 164 zones_size[ZONE_DMA] = low; 165 #endif 166 #ifdef CONFIG_HIGHMEM 167 if (cpu_has_dc_aliases) { 168 printk(KERN_WARNING "This processor doesn't support highmem."); 169 if (high - low) 170 printk(" %ldk highmem ignored", high - low); 171 printk("\n"); 172 } else 173 zones_size[ZONE_HIGHMEM] = high - low; 174 #endif 175 176 free_area_init(zones_size); 177 } 178 179 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) 180 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 181 182 static inline int page_is_ram(unsigned long pagenr) 183 { 184 int i; 185 186 for (i = 0; i < boot_mem_map.nr_map; i++) { 187 unsigned long addr, end; 188 189 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 190 /* not usable memory */ 191 continue; 192 193 addr = PFN_UP(boot_mem_map.map[i].addr); 194 end = PFN_DOWN(boot_mem_map.map[i].addr + 195 boot_mem_map.map[i].size); 196 197 if (pagenr >= addr && pagenr < end) 198 return 1; 199 } 200 201 return 0; 202 } 203 204 static struct kcore_list kcore_mem, kcore_vmalloc; 205 #ifdef CONFIG_64BIT 206 static struct kcore_list kcore_kseg0; 207 #endif 208 209 void __init mem_init(void) 210 { 211 unsigned long codesize, reservedpages, datasize, initsize; 212 unsigned long tmp, ram; 213 214 #ifdef CONFIG_HIGHMEM 215 #ifdef CONFIG_DISCONTIGMEM 216 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" 217 #endif 218 max_mapnr = num_physpages = highend_pfn; 219 #else 220 max_mapnr = num_physpages = max_low_pfn; 221 #endif 222 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 223 224 totalram_pages += free_all_bootmem(); 225 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ 226 227 reservedpages = ram = 0; 228 for (tmp = 0; tmp < max_low_pfn; tmp++) 229 if (page_is_ram(tmp)) { 230 ram++; 231 if (PageReserved(mem_map+tmp)) 232 reservedpages++; 233 } 234 235 #ifdef CONFIG_HIGHMEM 236 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { 237 struct page *page = mem_map + tmp; 238 239 if (!page_is_ram(tmp)) { 240 SetPageReserved(page); 241 continue; 242 } 243 ClearPageReserved(page); 244 #ifdef CONFIG_LIMITED_DMA 245 set_page_address(page, lowmem_page_address(page)); 246 #endif 247 set_page_count(page, 1); 248 __free_page(page); 249 totalhigh_pages++; 250 } 251 totalram_pages += totalhigh_pages; 252 #endif 253 254 codesize = (unsigned long) &_etext - (unsigned long) &_text; 255 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 256 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 257 258 #ifdef CONFIG_64BIT 259 if ((unsigned long) &_text > (unsigned long) CKSEG0) 260 /* The -4 is a hack so that user tools don't have to handle 261 the overflow. */ 262 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); 263 #endif 264 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 265 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 266 VMALLOC_END-VMALLOC_START); 267 268 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 269 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 270 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 271 ram << (PAGE_SHIFT-10), 272 codesize >> 10, 273 reservedpages << (PAGE_SHIFT-10), 274 datasize >> 10, 275 initsize >> 10, 276 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 277 } 278 #endif /* !CONFIG_NEED_MULTIPLE_NODES */ 279 280 #ifdef CONFIG_BLK_DEV_INITRD 281 void free_initrd_mem(unsigned long start, unsigned long end) 282 { 283 #ifdef CONFIG_64BIT 284 /* Switch from KSEG0 to XKPHYS addresses */ 285 start = (unsigned long)phys_to_virt(CPHYSADDR(start)); 286 end = (unsigned long)phys_to_virt(CPHYSADDR(end)); 287 #endif 288 if (start < end) 289 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", 290 (end - start) >> 10); 291 292 for (; start < end; start += PAGE_SIZE) { 293 ClearPageReserved(virt_to_page(start)); 294 set_page_count(virt_to_page(start), 1); 295 free_page(start); 296 totalram_pages++; 297 } 298 } 299 #endif 300 301 extern unsigned long prom_free_prom_memory(void); 302 303 void free_initmem(void) 304 { 305 unsigned long addr, page, freed; 306 307 freed = prom_free_prom_memory(); 308 309 addr = (unsigned long) &__init_begin; 310 while (addr < (unsigned long) &__init_end) { 311 #ifdef CONFIG_64BIT 312 page = PAGE_OFFSET | CPHYSADDR(addr); 313 #else 314 page = addr; 315 #endif 316 ClearPageReserved(virt_to_page(page)); 317 set_page_count(virt_to_page(page), 1); 318 free_page(page); 319 totalram_pages++; 320 freed += PAGE_SIZE; 321 addr += PAGE_SIZE; 322 } 323 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", 324 freed >> 10); 325 } 326