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/pgalloc.h>
25 #include <asm/pgtable.h>
26 #include <asm/sections.h>
27 #include <asm/mca.h>
28
29 #ifdef CONFIG_VIRTUAL_MEM_MAP
30 static unsigned long max_gap;
31 #endif
32
33 /* physical address where the bootmem map is located */
34 unsigned long bootmap_start;
35
36 #ifdef CONFIG_SMP
37 static void *cpu_data;
38 /**
39 * per_cpu_init - setup per-cpu variables
40 *
41 * Allocate and setup per-cpu data areas.
42 */
per_cpu_init(void)43 void *per_cpu_init(void)
44 {
45 static bool first_time = true;
46 void *cpu0_data = __cpu0_per_cpu;
47 unsigned int cpu;
48
49 if (!first_time)
50 goto skip;
51 first_time = false;
52
53 /*
54 * get_free_pages() cannot be used before cpu_init() done.
55 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
56 * to avoid that AP calls get_zeroed_page().
57 */
58 for_each_possible_cpu(cpu) {
59 void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
60
61 memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
62 __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
63 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
64
65 /*
66 * percpu area for cpu0 is moved from the __init area
67 * which is setup by head.S and used till this point.
68 * Update ar.k3. This move is ensures that percpu
69 * area for cpu0 is on the correct node and its
70 * virtual address isn't insanely far from other
71 * percpu areas which is important for congruent
72 * percpu allocator.
73 */
74 if (cpu == 0)
75 ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
76 (unsigned long)__per_cpu_start);
77
78 cpu_data += PERCPU_PAGE_SIZE;
79 }
80 skip:
81 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
82 }
83
84 static inline void
alloc_per_cpu_data(void)85 alloc_per_cpu_data(void)
86 {
87 size_t size = PERCPU_PAGE_SIZE * num_possible_cpus();
88
89 cpu_data = memblock_alloc_from(size, PERCPU_PAGE_SIZE,
90 __pa(MAX_DMA_ADDRESS));
91 if (!cpu_data)
92 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
93 __func__, size, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
94 }
95
96 /**
97 * setup_per_cpu_areas - setup percpu areas
98 *
99 * Arch code has already allocated and initialized percpu areas. All
100 * this function has to do is to teach the determined layout to the
101 * dynamic percpu allocator, which happens to be more complex than
102 * creating whole new ones using helpers.
103 */
104 void __init
setup_per_cpu_areas(void)105 setup_per_cpu_areas(void)
106 {
107 struct pcpu_alloc_info *ai;
108 struct pcpu_group_info *gi;
109 unsigned int cpu;
110 ssize_t static_size, reserved_size, dyn_size;
111
112 ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
113 if (!ai)
114 panic("failed to allocate pcpu_alloc_info");
115 gi = &ai->groups[0];
116
117 /* units are assigned consecutively to possible cpus */
118 for_each_possible_cpu(cpu)
119 gi->cpu_map[gi->nr_units++] = cpu;
120
121 /* set parameters */
122 static_size = __per_cpu_end - __per_cpu_start;
123 reserved_size = PERCPU_MODULE_RESERVE;
124 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
125 if (dyn_size < 0)
126 panic("percpu area overflow static=%zd reserved=%zd\n",
127 static_size, reserved_size);
128
129 ai->static_size = static_size;
130 ai->reserved_size = reserved_size;
131 ai->dyn_size = dyn_size;
132 ai->unit_size = PERCPU_PAGE_SIZE;
133 ai->atom_size = PAGE_SIZE;
134 ai->alloc_size = PERCPU_PAGE_SIZE;
135
136 pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
137 pcpu_free_alloc_info(ai);
138 }
139 #else
140 #define alloc_per_cpu_data() do { } while (0)
141 #endif /* CONFIG_SMP */
142
143 /**
144 * find_memory - setup memory map
145 *
146 * Walk the EFI memory map and find usable memory for the system, taking
147 * into account reserved areas.
148 */
149 void __init
find_memory(void)150 find_memory (void)
151 {
152 reserve_memory();
153
154 /* first find highest page frame number */
155 min_low_pfn = ~0UL;
156 max_low_pfn = 0;
157 efi_memmap_walk(find_max_min_low_pfn, NULL);
158 max_pfn = max_low_pfn;
159
160 #ifdef CONFIG_VIRTUAL_MEM_MAP
161 efi_memmap_walk(filter_memory, register_active_ranges);
162 #else
163 memblock_add_node(0, PFN_PHYS(max_low_pfn), 0);
164 #endif
165
166 find_initrd();
167
168 alloc_per_cpu_data();
169 }
170
171 /*
172 * Set up the page tables.
173 */
174
175 void __init
paging_init(void)176 paging_init (void)
177 {
178 unsigned long max_dma;
179 unsigned long max_zone_pfns[MAX_NR_ZONES];
180
181 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
182 #ifdef CONFIG_ZONE_DMA32
183 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
184 max_zone_pfns[ZONE_DMA32] = max_dma;
185 #endif
186 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
187
188 #ifdef CONFIG_VIRTUAL_MEM_MAP
189 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
190 if (max_gap < LARGE_GAP) {
191 vmem_map = (struct page *) 0;
192 } else {
193 unsigned long map_size;
194
195 /* allocate virtual_mem_map */
196
197 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
198 sizeof(struct page));
199 VMALLOC_END -= map_size;
200 vmem_map = (struct page *) VMALLOC_END;
201 efi_memmap_walk(create_mem_map_page_table, NULL);
202
203 /*
204 * alloc_node_mem_map makes an adjustment for mem_map
205 * which isn't compatible with vmem_map.
206 */
207 NODE_DATA(0)->node_mem_map = vmem_map +
208 find_min_pfn_with_active_regions();
209
210 printk("Virtual mem_map starts at 0x%p\n", mem_map);
211 }
212 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
213 free_area_init_nodes(max_zone_pfns);
214 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
215 }
216