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
28 static unsigned long max_gap;
29 #endif
30
31 /* physical address where the bootmem map is located */
32 unsigned long bootmap_start;
33
34 #ifdef CONFIG_SMP
35 static void *cpu_data;
36 /**
37 * per_cpu_init - setup per-cpu variables
38 *
39 * Allocate and setup per-cpu data areas.
40 */
per_cpu_init(void)41 void *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 }
78 skip:
79 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
80 }
81
82 static inline void
alloc_per_cpu_data(void)83 alloc_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 */
102 void __init
setup_per_cpu_areas(void)103 setup_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 */
147 void __init
find_memory(void)148 find_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
173 void __init
paging_init(void)174 paging_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