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) 1998-2003 Hewlett-Packard Co 7 * David Mosberger-Tang <davidm@hpl.hp.com> 8 * Stephane Eranian <eranian@hpl.hp.com> 9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com> 10 * Copyright (C) 1999 VA Linux Systems 11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved. 13 * 14 * Routines used by ia64 machines with contiguous (or virtually contiguous) 15 * memory. 16 */ 17 #include <linux/bootmem.h> 18 #include <linux/efi.h> 19 #include <linux/memblock.h> 20 #include <linux/mm.h> 21 #include <linux/nmi.h> 22 #include <linux/swap.h> 23 24 #include <asm/meminit.h> 25 #include <asm/pgalloc.h> 26 #include <asm/pgtable.h> 27 #include <asm/sections.h> 28 #include <asm/mca.h> 29 30 #ifdef CONFIG_VIRTUAL_MEM_MAP 31 static unsigned long max_gap; 32 #endif 33 34 /* physical address where the bootmem map is located */ 35 unsigned long bootmap_start; 36 37 /** 38 * find_bootmap_location - callback to find a memory area for the bootmap 39 * @start: start of region 40 * @end: end of region 41 * @arg: unused callback data 42 * 43 * Find a place to put the bootmap and return its starting address in 44 * bootmap_start. This address must be page-aligned. 45 */ 46 static int __init 47 find_bootmap_location (u64 start, u64 end, void *arg) 48 { 49 u64 needed = *(unsigned long *)arg; 50 u64 range_start, range_end, free_start; 51 int i; 52 53 #if IGNORE_PFN0 54 if (start == PAGE_OFFSET) { 55 start += PAGE_SIZE; 56 if (start >= end) 57 return 0; 58 } 59 #endif 60 61 free_start = PAGE_OFFSET; 62 63 for (i = 0; i < num_rsvd_regions; i++) { 64 range_start = max(start, free_start); 65 range_end = min(end, rsvd_region[i].start & PAGE_MASK); 66 67 free_start = PAGE_ALIGN(rsvd_region[i].end); 68 69 if (range_end <= range_start) 70 continue; /* skip over empty range */ 71 72 if (range_end - range_start >= needed) { 73 bootmap_start = __pa(range_start); 74 return -1; /* done */ 75 } 76 77 /* nothing more available in this segment */ 78 if (range_end == end) 79 return 0; 80 } 81 return 0; 82 } 83 84 #ifdef CONFIG_SMP 85 static void *cpu_data; 86 /** 87 * per_cpu_init - setup per-cpu variables 88 * 89 * Allocate and setup per-cpu data areas. 90 */ 91 void *per_cpu_init(void) 92 { 93 static bool first_time = true; 94 void *cpu0_data = __cpu0_per_cpu; 95 unsigned int cpu; 96 97 if (!first_time) 98 goto skip; 99 first_time = false; 100 101 /* 102 * get_free_pages() cannot be used before cpu_init() done. 103 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs 104 * to avoid that AP calls get_zeroed_page(). 105 */ 106 for_each_possible_cpu(cpu) { 107 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start; 108 109 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start); 110 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start; 111 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 112 113 /* 114 * percpu area for cpu0 is moved from the __init area 115 * which is setup by head.S and used till this point. 116 * Update ar.k3. This move is ensures that percpu 117 * area for cpu0 is on the correct node and its 118 * virtual address isn't insanely far from other 119 * percpu areas which is important for congruent 120 * percpu allocator. 121 */ 122 if (cpu == 0) 123 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) - 124 (unsigned long)__per_cpu_start); 125 126 cpu_data += PERCPU_PAGE_SIZE; 127 } 128 skip: 129 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 130 } 131 132 static inline void 133 alloc_per_cpu_data(void) 134 { 135 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(), 136 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 137 } 138 139 /** 140 * setup_per_cpu_areas - setup percpu areas 141 * 142 * Arch code has already allocated and initialized percpu areas. All 143 * this function has to do is to teach the determined layout to the 144 * dynamic percpu allocator, which happens to be more complex than 145 * creating whole new ones using helpers. 146 */ 147 void __init 148 setup_per_cpu_areas(void) 149 { 150 struct pcpu_alloc_info *ai; 151 struct pcpu_group_info *gi; 152 unsigned int cpu; 153 ssize_t static_size, reserved_size, dyn_size; 154 int rc; 155 156 ai = pcpu_alloc_alloc_info(1, num_possible_cpus()); 157 if (!ai) 158 panic("failed to allocate pcpu_alloc_info"); 159 gi = &ai->groups[0]; 160 161 /* units are assigned consecutively to possible cpus */ 162 for_each_possible_cpu(cpu) 163 gi->cpu_map[gi->nr_units++] = cpu; 164 165 /* set parameters */ 166 static_size = __per_cpu_end - __per_cpu_start; 167 reserved_size = PERCPU_MODULE_RESERVE; 168 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size; 169 if (dyn_size < 0) 170 panic("percpu area overflow static=%zd reserved=%zd\n", 171 static_size, reserved_size); 172 173 ai->static_size = static_size; 174 ai->reserved_size = reserved_size; 175 ai->dyn_size = dyn_size; 176 ai->unit_size = PERCPU_PAGE_SIZE; 177 ai->atom_size = PAGE_SIZE; 178 ai->alloc_size = PERCPU_PAGE_SIZE; 179 180 rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]); 181 if (rc) 182 panic("failed to setup percpu area (err=%d)", rc); 183 184 pcpu_free_alloc_info(ai); 185 } 186 #else 187 #define alloc_per_cpu_data() do { } while (0) 188 #endif /* CONFIG_SMP */ 189 190 /** 191 * find_memory - setup memory map 192 * 193 * Walk the EFI memory map and find usable memory for the system, taking 194 * into account reserved areas. 195 */ 196 void __init 197 find_memory (void) 198 { 199 unsigned long bootmap_size; 200 201 reserve_memory(); 202 203 /* first find highest page frame number */ 204 min_low_pfn = ~0UL; 205 max_low_pfn = 0; 206 efi_memmap_walk(find_max_min_low_pfn, NULL); 207 max_pfn = max_low_pfn; 208 /* how many bytes to cover all the pages */ 209 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; 210 211 /* look for a location to hold the bootmap */ 212 bootmap_start = ~0UL; 213 efi_memmap_walk(find_bootmap_location, &bootmap_size); 214 if (bootmap_start == ~0UL) 215 panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 216 217 bootmap_size = init_bootmem_node(NODE_DATA(0), 218 (bootmap_start >> PAGE_SHIFT), 0, max_pfn); 219 220 /* Free all available memory, then mark bootmem-map as being in use. */ 221 efi_memmap_walk(filter_rsvd_memory, free_bootmem); 222 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); 223 224 find_initrd(); 225 226 alloc_per_cpu_data(); 227 } 228 229 /* 230 * Set up the page tables. 231 */ 232 233 void __init 234 paging_init (void) 235 { 236 unsigned long max_dma; 237 unsigned long max_zone_pfns[MAX_NR_ZONES]; 238 239 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 240 #ifdef CONFIG_ZONE_DMA 241 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 242 max_zone_pfns[ZONE_DMA] = max_dma; 243 #endif 244 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 245 246 #ifdef CONFIG_VIRTUAL_MEM_MAP 247 efi_memmap_walk(filter_memory, register_active_ranges); 248 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 249 if (max_gap < LARGE_GAP) { 250 vmem_map = (struct page *) 0; 251 free_area_init_nodes(max_zone_pfns); 252 } else { 253 unsigned long map_size; 254 255 /* allocate virtual_mem_map */ 256 257 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * 258 sizeof(struct page)); 259 VMALLOC_END -= map_size; 260 vmem_map = (struct page *) VMALLOC_END; 261 efi_memmap_walk(create_mem_map_page_table, NULL); 262 263 /* 264 * alloc_node_mem_map makes an adjustment for mem_map 265 * which isn't compatible with vmem_map. 266 */ 267 NODE_DATA(0)->node_mem_map = vmem_map + 268 find_min_pfn_with_active_regions(); 269 free_area_init_nodes(max_zone_pfns); 270 271 printk("Virtual mem_map starts at 0x%p\n", mem_map); 272 } 273 #else /* !CONFIG_VIRTUAL_MEM_MAP */ 274 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0); 275 free_area_init_nodes(max_zone_pfns); 276 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 277 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 278 } 279