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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 | 71 | case 0x2827: /* zEC12 */ |
59471227 | 72 | case 0x2828: /* zEC12 */ |
7919e91b MS |
73 | default: |
74 | order = 5; | |
75 | break; | |
238ec4ef | 76 | } |
7919e91b MS |
77 | /* Limit number of empty zero pages for small memory sizes */ |
78 | if (order > 2 && totalram_pages <= 16384) | |
79 | order = 2; | |
238ec4ef MS |
80 | |
81 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
82 | if (!empty_zero_page) | |
83 | panic("Out of memory in setup_zero_pages"); | |
84 | ||
85 | page = virt_to_page((void *) empty_zero_page); | |
86 | split_page(page, order); | |
87 | for (i = 1 << order; i > 0; i--) { | |
0999f119 | 88 | mark_page_reserved(page); |
238ec4ef MS |
89 | page++; |
90 | } | |
91 | ||
0999f119 | 92 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
238ec4ef MS |
93 | } |
94 | ||
1da177e4 LT |
95 | /* |
96 | * paging_init() sets up the page tables | |
97 | */ | |
1da177e4 LT |
98 | void __init paging_init(void) |
99 | { | |
39b742f9 | 100 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14045ebf | 101 | unsigned long pgd_type, asce_bits; |
d882b172 | 102 | |
3610cce8 | 103 | init_mm.pgd = swapper_pg_dir; |
f4eb07c1 | 104 | #ifdef CONFIG_64BIT |
14045ebf MS |
105 | if (VMALLOC_END > (1UL << 42)) { |
106 | asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; | |
107 | pgd_type = _REGION2_ENTRY_EMPTY; | |
108 | } else { | |
109 | asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
110 | pgd_type = _REGION3_ENTRY_EMPTY; | |
111 | } | |
f4eb07c1 | 112 | #else |
14045ebf | 113 | asce_bits = _ASCE_TABLE_LENGTH; |
3610cce8 | 114 | pgd_type = _SEGMENT_ENTRY_EMPTY; |
f4eb07c1 | 115 | #endif |
14045ebf | 116 | S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
3610cce8 MS |
117 | clear_table((unsigned long *) init_mm.pgd, pgd_type, |
118 | sizeof(unsigned long)*2048); | |
f4eb07c1 | 119 | vmem_map_init(); |
1da177e4 | 120 | |
1da177e4 | 121 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
122 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
123 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
124 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
df9ee292 | 125 | arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); |
1da177e4 | 126 | |
17f34580 HC |
127 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
128 | sparse_init(); | |
39b742f9 HC |
129 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
130 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
131 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
132 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 133 | } |
1da177e4 LT |
134 | |
135 | void __init mem_init(void) | |
136 | { | |
1b948d6c MS |
137 | if (MACHINE_HAS_TLB_LC) |
138 | cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); | |
139 | cpumask_set_cpu(0, mm_cpumask(&init_mm)); | |
140 | atomic_set(&init_mm.context.attach_count, 1); | |
141 | ||
a18d0e2d | 142 | max_mapnr = max_low_pfn; |
1da177e4 LT |
143 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
144 | ||
45e576b1 MS |
145 | /* Setup guest page hinting */ |
146 | cmma_init(); | |
147 | ||
1da177e4 | 148 | /* this will put all low memory onto the freelists */ |
0c988534 | 149 | free_all_bootmem(); |
0999f119 | 150 | setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 | 151 | |
a18d0e2d | 152 | mem_init_print_info(NULL); |
d882b172 | 153 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
162e006e HC |
154 | (unsigned long)&_stext, |
155 | PFN_ALIGN((unsigned long)&_eshared) - 1); | |
1da177e4 LT |
156 | } |
157 | ||
d96221ab HC |
158 | void free_initmem(void) |
159 | { | |
dbe67df4 | 160 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
161 | } |
162 | ||
163 | #ifdef CONFIG_BLK_DEV_INITRD | |
5e249d6e | 164 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
1da177e4 | 165 | { |
11199692 JL |
166 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
167 | "initrd"); | |
1da177e4 LT |
168 | } |
169 | #endif | |
421c175c HC |
170 | |
171 | #ifdef CONFIG_MEMORY_HOTPLUG | |
172 | int arch_add_memory(int nid, u64 start, u64 size) | |
173 | { | |
892365ab GS |
174 | unsigned long zone_start_pfn, zone_end_pfn, nr_pages; |
175 | unsigned long start_pfn = PFN_DOWN(start); | |
176 | unsigned long size_pages = PFN_DOWN(size); | |
421c175c HC |
177 | struct zone *zone; |
178 | int rc; | |
179 | ||
421c175c HC |
180 | rc = vmem_add_mapping(start, size); |
181 | if (rc) | |
182 | return rc; | |
892365ab GS |
183 | for_each_zone(zone) { |
184 | if (zone_idx(zone) != ZONE_MOVABLE) { | |
185 | /* Add range within existing zone limits */ | |
186 | zone_start_pfn = zone->zone_start_pfn; | |
187 | zone_end_pfn = zone->zone_start_pfn + | |
188 | zone->spanned_pages; | |
189 | } else { | |
190 | /* Add remaining range to ZONE_MOVABLE */ | |
191 | zone_start_pfn = start_pfn; | |
192 | zone_end_pfn = start_pfn + size_pages; | |
193 | } | |
194 | if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) | |
195 | continue; | |
196 | nr_pages = (start_pfn + size_pages > zone_end_pfn) ? | |
197 | zone_end_pfn - start_pfn : size_pages; | |
198 | rc = __add_pages(nid, zone, start_pfn, nr_pages); | |
199 | if (rc) | |
200 | break; | |
201 | start_pfn += nr_pages; | |
202 | size_pages -= nr_pages; | |
203 | if (!size_pages) | |
204 | break; | |
205 | } | |
421c175c HC |
206 | if (rc) |
207 | vmem_remove_mapping(start, size); | |
208 | return rc; | |
209 | } | |
24d335ca | 210 | |
e5d709bb HC |
211 | unsigned long memory_block_size_bytes(void) |
212 | { | |
213 | /* | |
214 | * Make sure the memory block size is always greater | |
215 | * or equal than the memory increment size. | |
216 | */ | |
217 | return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm()); | |
218 | } | |
219 | ||
24d335ca WC |
220 | #ifdef CONFIG_MEMORY_HOTREMOVE |
221 | int arch_remove_memory(u64 start, u64 size) | |
222 | { | |
223 | /* | |
224 | * There is no hardware or firmware interface which could trigger a | |
225 | * hot memory remove on s390. So there is nothing that needs to be | |
226 | * implemented. | |
227 | */ | |
228 | return -EBUSY; | |
229 | } | |
230 | #endif | |
421c175c | 231 | #endif /* CONFIG_MEMORY_HOTPLUG */ |