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1da177e4 LT |
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 | */ | |
1da177e4 LT |
17 | #include <linux/bootmem.h> |
18 | #include <linux/efi.h> | |
98e4ae8a | 19 | #include <linux/memblock.h> |
1da177e4 | 20 | #include <linux/mm.h> |
99a19cf1 | 21 | #include <linux/nmi.h> |
1da177e4 LT |
22 | #include <linux/swap.h> |
23 | ||
24 | #include <asm/meminit.h> | |
25 | #include <asm/pgalloc.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/sections.h> | |
28 | #include <asm/mca.h> | |
29 | ||
30 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 | 31 | static unsigned long max_gap; |
1da177e4 LT |
32 | #endif |
33 | ||
1da177e4 LT |
34 | /* physical address where the bootmem map is located */ |
35 | unsigned long bootmap_start; | |
36 | ||
1da177e4 LT |
37 | /** |
38 | * find_bootmap_location - callback to find a memory area for the bootmap | |
39 | * @start: start of region | |
40 | * @end: end of region | |
41 | * @arg: unused callback data | |
42 | * | |
43 | * Find a place to put the bootmap and return its starting address in | |
44 | * bootmap_start. This address must be page-aligned. | |
45 | */ | |
dae28066 | 46 | static int __init |
e088a4ad | 47 | find_bootmap_location (u64 start, u64 end, void *arg) |
1da177e4 | 48 | { |
e088a4ad MW |
49 | u64 needed = *(unsigned long *)arg; |
50 | u64 range_start, range_end, free_start; | |
1da177e4 LT |
51 | int i; |
52 | ||
53 | #if IGNORE_PFN0 | |
54 | if (start == PAGE_OFFSET) { | |
55 | start += PAGE_SIZE; | |
56 | if (start >= end) | |
57 | return 0; | |
58 | } | |
59 | #endif | |
60 | ||
61 | free_start = PAGE_OFFSET; | |
62 | ||
63 | for (i = 0; i < num_rsvd_regions; i++) { | |
64 | range_start = max(start, free_start); | |
65 | range_end = min(end, rsvd_region[i].start & PAGE_MASK); | |
66 | ||
67 | free_start = PAGE_ALIGN(rsvd_region[i].end); | |
68 | ||
69 | if (range_end <= range_start) | |
70 | continue; /* skip over empty range */ | |
71 | ||
72 | if (range_end - range_start >= needed) { | |
73 | bootmap_start = __pa(range_start); | |
74 | return -1; /* done */ | |
75 | } | |
76 | ||
77 | /* nothing more available in this segment */ | |
78 | if (range_end == end) | |
79 | return 0; | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
4b9ddc7c TL |
84 | #ifdef CONFIG_SMP |
85 | static void *cpu_data; | |
86 | /** | |
87 | * per_cpu_init - setup per-cpu variables | |
88 | * | |
89 | * Allocate and setup per-cpu data areas. | |
90 | */ | |
ccce9bb8 | 91 | void *per_cpu_init(void) |
4b9ddc7c | 92 | { |
36886478 TH |
93 | static bool first_time = true; |
94 | void *cpu0_data = __cpu0_per_cpu; | |
95 | unsigned int cpu; | |
96 | ||
97 | if (!first_time) | |
98 | goto skip; | |
99 | first_time = false; | |
4b9ddc7c TL |
100 | |
101 | /* | |
52594762 TH |
102 | * get_free_pages() cannot be used before cpu_init() done. |
103 | * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs | |
104 | * to avoid that AP calls get_zeroed_page(). | |
4b9ddc7c | 105 | */ |
52594762 | 106 | for_each_possible_cpu(cpu) { |
36886478 TH |
107 | void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start; |
108 | ||
109 | memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start); | |
110 | __per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start; | |
111 | per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; | |
112 | ||
113 | /* | |
114 | * percpu area for cpu0 is moved from the __init area | |
115 | * which is setup by head.S and used till this point. | |
116 | * Update ar.k3. This move is ensures that percpu | |
117 | * area for cpu0 is on the correct node and its | |
118 | * virtual address isn't insanely far from other | |
119 | * percpu areas which is important for congruent | |
120 | * percpu allocator. | |
121 | */ | |
122 | if (cpu == 0) | |
123 | ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) - | |
124 | (unsigned long)__per_cpu_start); | |
125 | ||
126 | cpu_data += PERCPU_PAGE_SIZE; | |
4b9ddc7c | 127 | } |
36886478 | 128 | skip: |
4b9ddc7c TL |
129 | return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; |
130 | } | |
131 | ||
132 | static inline void | |
133 | alloc_per_cpu_data(void) | |
134 | { | |
52594762 | 135 | cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(), |
4b9ddc7c TL |
136 | PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); |
137 | } | |
52594762 TH |
138 | |
139 | /** | |
140 | * setup_per_cpu_areas - setup percpu areas | |
141 | * | |
142 | * Arch code has already allocated and initialized percpu areas. All | |
143 | * this function has to do is to teach the determined layout to the | |
144 | * dynamic percpu allocator, which happens to be more complex than | |
145 | * creating whole new ones using helpers. | |
146 | */ | |
147 | void __init | |
148 | setup_per_cpu_areas(void) | |
149 | { | |
150 | struct pcpu_alloc_info *ai; | |
151 | struct pcpu_group_info *gi; | |
152 | unsigned int cpu; | |
153 | ssize_t static_size, reserved_size, dyn_size; | |
154 | int rc; | |
155 | ||
156 | ai = pcpu_alloc_alloc_info(1, num_possible_cpus()); | |
157 | if (!ai) | |
158 | panic("failed to allocate pcpu_alloc_info"); | |
159 | gi = &ai->groups[0]; | |
160 | ||
161 | /* units are assigned consecutively to possible cpus */ | |
162 | for_each_possible_cpu(cpu) | |
163 | gi->cpu_map[gi->nr_units++] = cpu; | |
164 | ||
165 | /* set parameters */ | |
166 | static_size = __per_cpu_end - __per_cpu_start; | |
167 | reserved_size = PERCPU_MODULE_RESERVE; | |
168 | dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size; | |
169 | if (dyn_size < 0) | |
170 | panic("percpu area overflow static=%zd reserved=%zd\n", | |
171 | static_size, reserved_size); | |
172 | ||
173 | ai->static_size = static_size; | |
174 | ai->reserved_size = reserved_size; | |
175 | ai->dyn_size = dyn_size; | |
176 | ai->unit_size = PERCPU_PAGE_SIZE; | |
177 | ai->atom_size = PAGE_SIZE; | |
178 | ai->alloc_size = PERCPU_PAGE_SIZE; | |
179 | ||
180 | rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]); | |
181 | if (rc) | |
182 | panic("failed to setup percpu area (err=%d)", rc); | |
183 | ||
184 | pcpu_free_alloc_info(ai); | |
185 | } | |
4b9ddc7c TL |
186 | #else |
187 | #define alloc_per_cpu_data() do { } while (0) | |
188 | #endif /* CONFIG_SMP */ | |
189 | ||
1da177e4 LT |
190 | /** |
191 | * find_memory - setup memory map | |
192 | * | |
193 | * Walk the EFI memory map and find usable memory for the system, taking | |
194 | * into account reserved areas. | |
195 | */ | |
dae28066 | 196 | void __init |
1da177e4 LT |
197 | find_memory (void) |
198 | { | |
199 | unsigned long bootmap_size; | |
200 | ||
201 | reserve_memory(); | |
202 | ||
203 | /* first find highest page frame number */ | |
a3f5c338 ZN |
204 | min_low_pfn = ~0UL; |
205 | max_low_pfn = 0; | |
206 | efi_memmap_walk(find_max_min_low_pfn, NULL); | |
207 | max_pfn = max_low_pfn; | |
1da177e4 LT |
208 | /* how many bytes to cover all the pages */ |
209 | bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; | |
210 | ||
211 | /* look for a location to hold the bootmap */ | |
212 | bootmap_start = ~0UL; | |
213 | efi_memmap_walk(find_bootmap_location, &bootmap_size); | |
214 | if (bootmap_start == ~0UL) | |
215 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
216 | ||
a3f5c338 ZN |
217 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
218 | (bootmap_start >> PAGE_SHIFT), 0, max_pfn); | |
1da177e4 LT |
219 | |
220 | /* Free all available memory, then mark bootmem-map as being in use. */ | |
221 | efi_memmap_walk(filter_rsvd_memory, free_bootmem); | |
72a7fe39 | 222 | reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); |
1da177e4 LT |
223 | |
224 | find_initrd(); | |
45a98fc6 | 225 | |
4b9ddc7c | 226 | alloc_per_cpu_data(); |
1da177e4 LT |
227 | } |
228 | ||
1da177e4 LT |
229 | /* |
230 | * Set up the page tables. | |
231 | */ | |
232 | ||
dae28066 | 233 | void __init |
1da177e4 LT |
234 | paging_init (void) |
235 | { | |
236 | unsigned long max_dma; | |
05e0caad | 237 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
1da177e4 | 238 | |
6391af17 | 239 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
09ae1f58 CL |
240 | #ifdef CONFIG_ZONE_DMA |
241 | max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
05e0caad | 242 | max_zone_pfns[ZONE_DMA] = max_dma; |
09ae1f58 | 243 | #endif |
05e0caad | 244 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
1da177e4 LT |
245 | |
246 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
98075d24 | 247 | efi_memmap_walk(filter_memory, register_active_ranges); |
1da177e4 LT |
248 | efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); |
249 | if (max_gap < LARGE_GAP) { | |
250 | vmem_map = (struct page *) 0; | |
05e0caad | 251 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
252 | } else { |
253 | unsigned long map_size; | |
254 | ||
255 | /* allocate virtual_mem_map */ | |
256 | ||
921eea1c BP |
257 | map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * |
258 | sizeof(struct page)); | |
126b3fcd TH |
259 | VMALLOC_END -= map_size; |
260 | vmem_map = (struct page *) VMALLOC_END; | |
1da177e4 LT |
261 | efi_memmap_walk(create_mem_map_page_table, NULL); |
262 | ||
05e0caad MG |
263 | /* |
264 | * alloc_node_mem_map makes an adjustment for mem_map | |
265 | * which isn't compatible with vmem_map. | |
266 | */ | |
267 | NODE_DATA(0)->node_mem_map = vmem_map + | |
268 | find_min_pfn_with_active_regions(); | |
269 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
270 | |
271 | printk("Virtual mem_map starts at 0x%p\n", mem_map); | |
272 | } | |
273 | #else /* !CONFIG_VIRTUAL_MEM_MAP */ | |
98e4ae8a | 274 | memblock_add_node(0, PFN_PHYS(max_low_pfn), 0); |
05e0caad | 275 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
276 | #endif /* !CONFIG_VIRTUAL_MEM_MAP */ |
277 | zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); | |
278 | } |