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>
23 #include <asm/meminit.h>
24 #include <asm/pgalloc.h>
25 #include <asm/pgtable.h>
26 #include <asm/sections.h>
29 #ifdef CONFIG_VIRTUAL_MEM_MAP
30 static unsigned long max_gap
;
33 /* physical address where the bootmem map is located */
34 unsigned long bootmap_start
;
37 static void *cpu_data
;
39 * per_cpu_init - setup per-cpu variables
41 * Allocate and setup per-cpu data areas.
43 void *per_cpu_init(void)
45 static bool first_time
= true;
46 void *cpu0_data
= __cpu0_per_cpu
;
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().
58 for_each_possible_cpu(cpu
) {
59 void *src
= cpu
== 0 ? cpu0_data
: __phys_per_cpu_start
;
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
];
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
75 ia64_set_kr(IA64_KR_PER_CPU_DATA
, __pa(cpu_data
) -
76 (unsigned long)__per_cpu_start
);
78 cpu_data
+= PERCPU_PAGE_SIZE
;
81 return __per_cpu_start
+ __per_cpu_offset
[smp_processor_id()];
85 alloc_per_cpu_data(void)
87 size_t size
= PERCPU_PAGE_SIZE
* num_possible_cpus();
89 cpu_data
= memblock_alloc_from(size
, PERCPU_PAGE_SIZE
,
90 __pa(MAX_DMA_ADDRESS
));
92 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
93 __func__
, size
, PERCPU_PAGE_SIZE
, __pa(MAX_DMA_ADDRESS
));
97 * setup_per_cpu_areas - setup percpu areas
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.
105 setup_per_cpu_areas(void)
107 struct pcpu_alloc_info
*ai
;
108 struct pcpu_group_info
*gi
;
110 ssize_t static_size
, reserved_size
, dyn_size
;
113 ai
= pcpu_alloc_alloc_info(1, num_possible_cpus());
115 panic("failed to allocate pcpu_alloc_info");
118 /* units are assigned consecutively to possible cpus */
119 for_each_possible_cpu(cpu
)
120 gi
->cpu_map
[gi
->nr_units
++] = cpu
;
123 static_size
= __per_cpu_end
- __per_cpu_start
;
124 reserved_size
= PERCPU_MODULE_RESERVE
;
125 dyn_size
= PERCPU_PAGE_SIZE
- static_size
- reserved_size
;
127 panic("percpu area overflow static=%zd reserved=%zd\n",
128 static_size
, reserved_size
);
130 ai
->static_size
= static_size
;
131 ai
->reserved_size
= reserved_size
;
132 ai
->dyn_size
= dyn_size
;
133 ai
->unit_size
= PERCPU_PAGE_SIZE
;
134 ai
->atom_size
= PAGE_SIZE
;
135 ai
->alloc_size
= PERCPU_PAGE_SIZE
;
137 rc
= pcpu_setup_first_chunk(ai
, __per_cpu_start
+ __per_cpu_offset
[0]);
139 panic("failed to setup percpu area (err=%d)", rc
);
141 pcpu_free_alloc_info(ai
);
144 #define alloc_per_cpu_data() do { } while (0)
145 #endif /* CONFIG_SMP */
148 * find_memory - setup memory map
150 * Walk the EFI memory map and find usable memory for the system, taking
151 * into account reserved areas.
158 /* first find highest page frame number */
161 efi_memmap_walk(find_max_min_low_pfn
, NULL
);
162 max_pfn
= max_low_pfn
;
164 #ifdef CONFIG_VIRTUAL_MEM_MAP
165 efi_memmap_walk(filter_memory
, register_active_ranges
);
167 memblock_add_node(0, PFN_PHYS(max_low_pfn
), 0);
172 alloc_per_cpu_data();
176 * Set up the page tables.
182 unsigned long max_dma
;
183 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
185 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
186 #ifdef CONFIG_ZONE_DMA32
187 max_dma
= virt_to_phys((void *) MAX_DMA_ADDRESS
) >> PAGE_SHIFT
;
188 max_zone_pfns
[ZONE_DMA32
] = max_dma
;
190 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
192 #ifdef CONFIG_VIRTUAL_MEM_MAP
193 efi_memmap_walk(find_largest_hole
, (u64
*)&max_gap
);
194 if (max_gap
< LARGE_GAP
) {
195 vmem_map
= (struct page
*) 0;
197 unsigned long map_size
;
199 /* allocate virtual_mem_map */
201 map_size
= PAGE_ALIGN(ALIGN(max_low_pfn
, MAX_ORDER_NR_PAGES
) *
202 sizeof(struct page
));
203 VMALLOC_END
-= map_size
;
204 vmem_map
= (struct page
*) VMALLOC_END
;
205 efi_memmap_walk(create_mem_map_page_table
, NULL
);
208 * alloc_node_mem_map makes an adjustment for mem_map
209 * which isn't compatible with vmem_map.
211 NODE_DATA(0)->node_mem_map
= vmem_map
+
212 find_min_pfn_with_active_regions();
214 printk("Virtual mem_map starts at 0x%p\n", mem_map
);
216 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
217 free_area_init_nodes(max_zone_pfns
);
218 zero_page_memmap_ptr
= virt_to_page(ia64_imva(empty_zero_page
));