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
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.
14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
17 #include <linux/efi.h>
18 #include <linux/memblock.h>
20 #include <linux/nmi.h>
21 #include <linux/swap.h>
22 #include <linux/sizes.h>
24 #include <asm/meminit.h>
25 #include <asm/sections.h>
28 /* physical address where the bootmem map is located */
29 unsigned long bootmap_start;
32 static void *cpu_data;
34 * per_cpu_init - setup per-cpu variables
36 * Allocate and setup per-cpu data areas.
38 void *per_cpu_init(void)
40 static bool first_time = true;
41 void *cpu0_data = __cpu0_per_cpu;
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().
53 for_each_possible_cpu(cpu) {
54 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
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];
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
70 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
71 (unsigned long)__per_cpu_start);
73 cpu_data += PERCPU_PAGE_SIZE;
76 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
80 alloc_per_cpu_data(void)
82 size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
84 cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE,
85 __pa(MAX_DMA_ADDRESS));
87 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
88 __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
92 * setup_per_cpu_areas - setup percpu areas
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.
100 setup_per_cpu_areas(void)
102 struct pcpu_alloc_info *ai;
103 struct pcpu_group_info *gi;
105 ssize_t static_size, reserved_size, dyn_size;
107 ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
109 panic("failed to allocate pcpu_alloc_info");
112 /* units are assigned consecutively to possible cpus */
113 for_each_possible_cpu(cpu)
114 gi->cpu_map[gi->nr_units++] = cpu;
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;
121 panic("percpu area overflow static=%zd reserved=%zd\n",
122 static_size, reserved_size);
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;
131 pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
132 pcpu_free_alloc_info(ai);
135 #define alloc_per_cpu_data() do { } while (0)
136 #endif /* CONFIG_SMP */
139 * find_memory - setup memory map
141 * Walk the EFI memory map and find usable memory for the system, taking
142 * into account reserved areas.
149 /* first find highest page frame number */
152 efi_memmap_walk(find_max_min_low_pfn, NULL);
153 max_pfn = max_low_pfn;
155 #ifdef CONFIG_VIRTUAL_MEM_MAP
156 efi_memmap_walk(filter_memory, register_active_ranges);
158 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
163 alloc_per_cpu_data();
166 static int __init find_largest_hole(u64 start, u64 end, void *arg)
170 static u64 last_end = PAGE_OFFSET;
172 /* NOTE: this algorithm assumes efi memmap table is ordered */
174 if (*max_gap < (start - last_end))
175 *max_gap = start - last_end;
180 static void __init verify_gap_absence(void)
182 unsigned long max_gap;
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",
193 * Set up the page tables.
199 unsigned long max_dma;
200 unsigned long max_zone_pfns[MAX_NR_ZONES];
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;
207 verify_gap_absence();
209 free_area_init(max_zone_pfns);
210 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));