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