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/efi.h> 18 #include <linux/memblock.h> 19 #include <linux/mm.h> 20 #include <linux/nmi.h> 21 #include <linux/swap.h> 22 23 #include <asm/meminit.h> 24 #include <asm/pgalloc.h> 25 #include <asm/sections.h> 26 #include <asm/mca.h> 27 28 #ifdef CONFIG_VIRTUAL_MEM_MAP 29 static unsigned long max_gap; 30 #endif 31 32 /* physical address where the bootmem map is located */ 33 unsigned long bootmap_start; 34 35 #ifdef CONFIG_SMP 36 static void *cpu_data; 37 /** 38 * per_cpu_init - setup per-cpu variables 39 * 40 * Allocate and setup per-cpu data areas. 41 */ 42 void *per_cpu_init(void) 43 { 44 static bool first_time = true; 45 void *cpu0_data = __cpu0_per_cpu; 46 unsigned int cpu; 47 48 if (!first_time) 49 goto skip; 50 first_time = false; 51 52 /* 53 * get_free_pages() cannot be used before cpu_init() done. 54 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs 55 * to avoid that AP calls get_zeroed_page(). 56 */ 57 for_each_possible_cpu(cpu) { 58 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start; 59 60 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start); 61 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start; 62 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 63 64 /* 65 * percpu area for cpu0 is moved from the __init area 66 * which is setup by head.S and used till this point. 67 * Update ar.k3. This move is ensures that percpu 68 * area for cpu0 is on the correct node and its 69 * virtual address isn't insanely far from other 70 * percpu areas which is important for congruent 71 * percpu allocator. 72 */ 73 if (cpu == 0) 74 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) - 75 (unsigned long)__per_cpu_start); 76 77 cpu_data += PERCPU_PAGE_SIZE; 78 } 79 skip: 80 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 81 } 82 83 static inline void 84 alloc_per_cpu_data(void) 85 { 86 size_t size = PERCPU_PAGE_SIZE * num_possible_cpus(); 87 88 cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE, 89 __pa(MAX_DMA_ADDRESS)); 90 if (!cpu_data) 91 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n", 92 __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 93 } 94 95 /** 96 * setup_per_cpu_areas - setup percpu areas 97 * 98 * Arch code has already allocated and initialized percpu areas. All 99 * this function has to do is to teach the determined layout to the 100 * dynamic percpu allocator, which happens to be more complex than 101 * creating whole new ones using helpers. 102 */ 103 void __init 104 setup_per_cpu_areas(void) 105 { 106 struct pcpu_alloc_info *ai; 107 struct pcpu_group_info *gi; 108 unsigned int cpu; 109 ssize_t static_size, reserved_size, dyn_size; 110 111 ai = pcpu_alloc_alloc_info(1, num_possible_cpus()); 112 if (!ai) 113 panic("failed to allocate pcpu_alloc_info"); 114 gi = &ai->groups[0]; 115 116 /* units are assigned consecutively to possible cpus */ 117 for_each_possible_cpu(cpu) 118 gi->cpu_map[gi->nr_units++] = cpu; 119 120 /* set parameters */ 121 static_size = __per_cpu_end - __per_cpu_start; 122 reserved_size = PERCPU_MODULE_RESERVE; 123 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size; 124 if (dyn_size < 0) 125 panic("percpu area overflow static=%zd reserved=%zd\n", 126 static_size, reserved_size); 127 128 ai->static_size = static_size; 129 ai->reserved_size = reserved_size; 130 ai->dyn_size = dyn_size; 131 ai->unit_size = PERCPU_PAGE_SIZE; 132 ai->atom_size = PAGE_SIZE; 133 ai->alloc_size = PERCPU_PAGE_SIZE; 134 135 pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]); 136 pcpu_free_alloc_info(ai); 137 } 138 #else 139 #define alloc_per_cpu_data() do { } while (0) 140 #endif /* CONFIG_SMP */ 141 142 /** 143 * find_memory - setup memory map 144 * 145 * Walk the EFI memory map and find usable memory for the system, taking 146 * into account reserved areas. 147 */ 148 void __init 149 find_memory (void) 150 { 151 reserve_memory(); 152 153 /* first find highest page frame number */ 154 min_low_pfn = ~0UL; 155 max_low_pfn = 0; 156 efi_memmap_walk(find_max_min_low_pfn, NULL); 157 max_pfn = max_low_pfn; 158 159 #ifdef CONFIG_VIRTUAL_MEM_MAP 160 efi_memmap_walk(filter_memory, register_active_ranges); 161 #else 162 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0); 163 #endif 164 165 find_initrd(); 166 167 alloc_per_cpu_data(); 168 } 169 170 /* 171 * Set up the page tables. 172 */ 173 174 void __init 175 paging_init (void) 176 { 177 unsigned long max_dma; 178 unsigned long max_zone_pfns[MAX_NR_ZONES]; 179 180 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 181 #ifdef CONFIG_ZONE_DMA32 182 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 183 max_zone_pfns[ZONE_DMA32] = max_dma; 184 #endif 185 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 186 187 #ifdef CONFIG_VIRTUAL_MEM_MAP 188 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 189 if (max_gap < LARGE_GAP) { 190 vmem_map = (struct page *) 0; 191 } else { 192 unsigned long map_size; 193 194 /* allocate virtual_mem_map */ 195 196 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * 197 sizeof(struct page)); 198 VMALLOC_END -= map_size; 199 vmem_map = (struct page *) VMALLOC_END; 200 efi_memmap_walk(create_mem_map_page_table, NULL); 201 202 /* 203 * alloc_node_mem_map makes an adjustment for mem_map 204 * which isn't compatible with vmem_map. 205 */ 206 NODE_DATA(0)->node_mem_map = vmem_map + 207 find_min_pfn_with_active_regions(); 208 209 printk("Virtual mem_map starts at 0x%p\n", mem_map); 210 } 211 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 212 free_area_init(max_zone_pfns); 213 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 214 } 215