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