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