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 #include <linux/sizes.h> 23 24 #include <asm/meminit.h> 25 #include <asm/sections.h> 26 #include <asm/mca.h> 27 28 /* physical address where the bootmem map is located */ 29 unsigned long bootmap_start; 30 31 #ifdef CONFIG_SMP 32 static void *cpu_data; 33 /** 34 * per_cpu_init - setup per-cpu variables 35 * 36 * Allocate and setup per-cpu data areas. 37 */ 38 void *per_cpu_init(void) 39 { 40 static bool first_time = true; 41 void *cpu0_data = __cpu0_per_cpu; 42 unsigned int cpu; 43 44 if (!first_time) 45 goto skip; 46 first_time = false; 47 48 /* 49 * get_free_pages() cannot be used before cpu_init() done. 50 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs 51 * to avoid that AP calls get_zeroed_page(). 52 */ 53 for_each_possible_cpu(cpu) { 54 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start; 55 56 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start); 57 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start; 58 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 59 60 /* 61 * percpu area for cpu0 is moved from the __init area 62 * which is setup by head.S and used till this point. 63 * Update ar.k3. This move is ensures that percpu 64 * area for cpu0 is on the correct node and its 65 * virtual address isn't insanely far from other 66 * percpu areas which is important for congruent 67 * percpu allocator. 68 */ 69 if (cpu == 0) 70 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) - 71 (unsigned long)__per_cpu_start); 72 73 cpu_data += PERCPU_PAGE_SIZE; 74 } 75 skip: 76 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 77 } 78 79 static inline void 80 alloc_per_cpu_data(void) 81 { 82 size_t size = PERCPU_PAGE_SIZE * num_possible_cpus(); 83 84 cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE, 85 __pa(MAX_DMA_ADDRESS)); 86 if (!cpu_data) 87 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n", 88 __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 89 } 90 91 /** 92 * setup_per_cpu_areas - setup percpu areas 93 * 94 * Arch code has already allocated and initialized percpu areas. All 95 * this function has to do is to teach the determined layout to the 96 * dynamic percpu allocator, which happens to be more complex than 97 * creating whole new ones using helpers. 98 */ 99 void __init 100 setup_per_cpu_areas(void) 101 { 102 struct pcpu_alloc_info *ai; 103 struct pcpu_group_info *gi; 104 unsigned int cpu; 105 ssize_t static_size, reserved_size, dyn_size; 106 107 ai = pcpu_alloc_alloc_info(1, num_possible_cpus()); 108 if (!ai) 109 panic("failed to allocate pcpu_alloc_info"); 110 gi = &ai->groups[0]; 111 112 /* units are assigned consecutively to possible cpus */ 113 for_each_possible_cpu(cpu) 114 gi->cpu_map[gi->nr_units++] = cpu; 115 116 /* set parameters */ 117 static_size = __per_cpu_end - __per_cpu_start; 118 reserved_size = PERCPU_MODULE_RESERVE; 119 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size; 120 if (dyn_size < 0) 121 panic("percpu area overflow static=%zd reserved=%zd\n", 122 static_size, reserved_size); 123 124 ai->static_size = static_size; 125 ai->reserved_size = reserved_size; 126 ai->dyn_size = dyn_size; 127 ai->unit_size = PERCPU_PAGE_SIZE; 128 ai->atom_size = PAGE_SIZE; 129 ai->alloc_size = PERCPU_PAGE_SIZE; 130 131 pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]); 132 pcpu_free_alloc_info(ai); 133 } 134 #else 135 #define alloc_per_cpu_data() do { } while (0) 136 #endif /* CONFIG_SMP */ 137 138 /** 139 * find_memory - setup memory map 140 * 141 * Walk the EFI memory map and find usable memory for the system, taking 142 * into account reserved areas. 143 */ 144 void __init 145 find_memory (void) 146 { 147 reserve_memory(); 148 149 /* first find highest page frame number */ 150 min_low_pfn = ~0UL; 151 max_low_pfn = 0; 152 efi_memmap_walk(find_max_min_low_pfn, NULL); 153 max_pfn = max_low_pfn; 154 155 #ifdef CONFIG_VIRTUAL_MEM_MAP 156 efi_memmap_walk(filter_memory, register_active_ranges); 157 #else 158 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0); 159 #endif 160 161 find_initrd(); 162 163 alloc_per_cpu_data(); 164 } 165 166 static int __init find_largest_hole(u64 start, u64 end, void *arg) 167 { 168 u64 *max_gap = arg; 169 170 static u64 last_end = PAGE_OFFSET; 171 172 /* NOTE: this algorithm assumes efi memmap table is ordered */ 173 174 if (*max_gap < (start - last_end)) 175 *max_gap = start - last_end; 176 last_end = end; 177 return 0; 178 } 179 180 static void __init verify_gap_absence(void) 181 { 182 unsigned long max_gap; 183 184 /* Forbid FLATMEM if hole is > than 1G */ 185 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 186 if (max_gap >= SZ_1G) 187 panic("Cannot use FLATMEM with %ldMB hole\n" 188 "Please switch over to SPARSEMEM\n", 189 (max_gap >> 20)); 190 } 191 192 /* 193 * Set up the page tables. 194 */ 195 196 void __init 197 paging_init (void) 198 { 199 unsigned long max_dma; 200 unsigned long max_zone_pfns[MAX_NR_ZONES]; 201 202 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 203 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 204 max_zone_pfns[ZONE_DMA32] = max_dma; 205 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 206 207 verify_gap_absence(); 208 209 free_area_init(max_zone_pfns); 210 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 211 } 212