Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * S390 version |
a53c8fab | 3 | * Copyright IBM Corp. 1999 |
1da177e4 LT |
4 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
5 | * | |
6 | * Derived from "arch/i386/mm/init.c" | |
7 | * Copyright (C) 1995 Linus Torvalds | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/signal.h> |
11 | #include <linux/sched.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/mman.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/bootmem.h> | |
e5d709bb | 24 | #include <linux/memory.h> |
d882b172 | 25 | #include <linux/pfn.h> |
028d9b3c | 26 | #include <linux/poison.h> |
2b67fc46 | 27 | #include <linux/initrd.h> |
3a4c5d59 | 28 | #include <linux/export.h> |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
1da177e4 | 30 | #include <asm/processor.h> |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/dma.h> | |
35 | #include <asm/lowcore.h> | |
36 | #include <asm/tlb.h> | |
37 | #include <asm/tlbflush.h> | |
d882b172 | 38 | #include <asm/sections.h> |
a0616cde | 39 | #include <asm/ctl_reg.h> |
e5d709bb | 40 | #include <asm/sclp.h> |
1da177e4 | 41 | |
1da177e4 | 42 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); |
1485c5c8 | 43 | |
238ec4ef | 44 | unsigned long empty_zero_page, zero_page_mask; |
1485c5c8 | 45 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 46 | |
0999f119 | 47 | static void __init setup_zero_pages(void) |
238ec4ef MS |
48 | { |
49 | struct cpuid cpu_id; | |
50 | unsigned int order; | |
238ec4ef MS |
51 | struct page *page; |
52 | int i; | |
53 | ||
54 | get_cpu_id(&cpu_id); | |
55 | switch (cpu_id.machine) { | |
56 | case 0x9672: /* g5 */ | |
57 | case 0x2064: /* z900 */ | |
58 | case 0x2066: /* z900 */ | |
59 | case 0x2084: /* z990 */ | |
60 | case 0x2086: /* z990 */ | |
61 | case 0x2094: /* z9-109 */ | |
62 | case 0x2096: /* z9-109 */ | |
63 | order = 0; | |
64 | break; | |
65 | case 0x2097: /* z10 */ | |
66 | case 0x2098: /* z10 */ | |
7919e91b MS |
67 | case 0x2817: /* z196 */ |
68 | case 0x2818: /* z196 */ | |
238ec4ef MS |
69 | order = 2; |
70 | break; | |
7919e91b MS |
71 | case 0x2827: /* zEC12 */ |
72 | default: | |
73 | order = 5; | |
74 | break; | |
238ec4ef | 75 | } |
7919e91b MS |
76 | /* Limit number of empty zero pages for small memory sizes */ |
77 | if (order > 2 && totalram_pages <= 16384) | |
78 | order = 2; | |
238ec4ef MS |
79 | |
80 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
81 | if (!empty_zero_page) | |
82 | panic("Out of memory in setup_zero_pages"); | |
83 | ||
84 | page = virt_to_page((void *) empty_zero_page); | |
85 | split_page(page, order); | |
86 | for (i = 1 << order; i > 0; i--) { | |
0999f119 | 87 | mark_page_reserved(page); |
238ec4ef MS |
88 | page++; |
89 | } | |
90 | ||
0999f119 | 91 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
238ec4ef MS |
92 | } |
93 | ||
1da177e4 LT |
94 | /* |
95 | * paging_init() sets up the page tables | |
96 | */ | |
1da177e4 LT |
97 | void __init paging_init(void) |
98 | { | |
39b742f9 | 99 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14045ebf | 100 | unsigned long pgd_type, asce_bits; |
d882b172 | 101 | |
3610cce8 | 102 | init_mm.pgd = swapper_pg_dir; |
f4eb07c1 | 103 | #ifdef CONFIG_64BIT |
14045ebf MS |
104 | if (VMALLOC_END > (1UL << 42)) { |
105 | asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; | |
106 | pgd_type = _REGION2_ENTRY_EMPTY; | |
107 | } else { | |
108 | asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
109 | pgd_type = _REGION3_ENTRY_EMPTY; | |
110 | } | |
f4eb07c1 | 111 | #else |
14045ebf | 112 | asce_bits = _ASCE_TABLE_LENGTH; |
3610cce8 | 113 | pgd_type = _SEGMENT_ENTRY_EMPTY; |
f4eb07c1 | 114 | #endif |
14045ebf | 115 | S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
3610cce8 MS |
116 | clear_table((unsigned long *) init_mm.pgd, pgd_type, |
117 | sizeof(unsigned long)*2048); | |
f4eb07c1 | 118 | vmem_map_init(); |
1da177e4 | 119 | |
1da177e4 | 120 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
121 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
122 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
123 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
df9ee292 | 124 | arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); |
1da177e4 | 125 | |
050eef36 MS |
126 | atomic_set(&init_mm.context.attach_count, 1); |
127 | ||
17f34580 HC |
128 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
129 | sparse_init(); | |
39b742f9 HC |
130 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
131 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
132 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
133 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 134 | } |
1da177e4 LT |
135 | |
136 | void __init mem_init(void) | |
137 | { | |
138 | unsigned long codesize, reservedpages, datasize, initsize; | |
139 | ||
140 | max_mapnr = num_physpages = max_low_pfn; | |
141 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
142 | ||
45e576b1 MS |
143 | /* Setup guest page hinting */ |
144 | cmma_init(); | |
145 | ||
1da177e4 LT |
146 | /* this will put all low memory onto the freelists */ |
147 | totalram_pages += free_all_bootmem(); | |
0999f119 | 148 | setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 LT |
149 | |
150 | reservedpages = 0; | |
151 | ||
152 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
153 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
154 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
155 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
cc013a88 | 156 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
157 | max_mapnr << (PAGE_SHIFT-10), |
158 | codesize >> 10, | |
159 | reservedpages << (PAGE_SHIFT-10), | |
160 | datasize >>10, | |
161 | initsize >> 10); | |
d882b172 | 162 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
162e006e HC |
163 | (unsigned long)&_stext, |
164 | PFN_ALIGN((unsigned long)&_eshared) - 1); | |
1da177e4 LT |
165 | } |
166 | ||
d96221ab HC |
167 | void free_initmem(void) |
168 | { | |
dbe67df4 | 169 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
170 | } |
171 | ||
172 | #ifdef CONFIG_BLK_DEV_INITRD | |
5e249d6e | 173 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
1da177e4 | 174 | { |
11199692 JL |
175 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
176 | "initrd"); | |
1da177e4 LT |
177 | } |
178 | #endif | |
421c175c HC |
179 | |
180 | #ifdef CONFIG_MEMORY_HOTPLUG | |
181 | int arch_add_memory(int nid, u64 start, u64 size) | |
182 | { | |
892365ab GS |
183 | unsigned long zone_start_pfn, zone_end_pfn, nr_pages; |
184 | unsigned long start_pfn = PFN_DOWN(start); | |
185 | unsigned long size_pages = PFN_DOWN(size); | |
421c175c HC |
186 | struct zone *zone; |
187 | int rc; | |
188 | ||
421c175c HC |
189 | rc = vmem_add_mapping(start, size); |
190 | if (rc) | |
191 | return rc; | |
892365ab GS |
192 | for_each_zone(zone) { |
193 | if (zone_idx(zone) != ZONE_MOVABLE) { | |
194 | /* Add range within existing zone limits */ | |
195 | zone_start_pfn = zone->zone_start_pfn; | |
196 | zone_end_pfn = zone->zone_start_pfn + | |
197 | zone->spanned_pages; | |
198 | } else { | |
199 | /* Add remaining range to ZONE_MOVABLE */ | |
200 | zone_start_pfn = start_pfn; | |
201 | zone_end_pfn = start_pfn + size_pages; | |
202 | } | |
203 | if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) | |
204 | continue; | |
205 | nr_pages = (start_pfn + size_pages > zone_end_pfn) ? | |
206 | zone_end_pfn - start_pfn : size_pages; | |
207 | rc = __add_pages(nid, zone, start_pfn, nr_pages); | |
208 | if (rc) | |
209 | break; | |
210 | start_pfn += nr_pages; | |
211 | size_pages -= nr_pages; | |
212 | if (!size_pages) | |
213 | break; | |
214 | } | |
421c175c HC |
215 | if (rc) |
216 | vmem_remove_mapping(start, size); | |
217 | return rc; | |
218 | } | |
24d335ca | 219 | |
e5d709bb HC |
220 | unsigned long memory_block_size_bytes(void) |
221 | { | |
222 | /* | |
223 | * Make sure the memory block size is always greater | |
224 | * or equal than the memory increment size. | |
225 | */ | |
226 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm()); | |
227 | } | |
228 | ||
24d335ca WC |
229 | #ifdef CONFIG_MEMORY_HOTREMOVE |
230 | int arch_remove_memory(u64 start, u64 size) | |
231 | { | |
232 | /* | |
233 | * There is no hardware or firmware interface which could trigger a | |
234 | * hot memory remove on s390. So there is nothing that needs to be | |
235 | * implemented. | |
236 | */ | |
237 | return -EBUSY; | |
238 | } | |
239 | #endif | |
421c175c | 240 | #endif /* CONFIG_MEMORY_HOTPLUG */ |