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> | |
d882b172 | 24 | #include <linux/pfn.h> |
028d9b3c | 25 | #include <linux/poison.h> |
2b67fc46 | 26 | #include <linux/initrd.h> |
3a4c5d59 | 27 | #include <linux/export.h> |
5a0e3ad6 | 28 | #include <linux/gfp.h> |
1da177e4 | 29 | #include <asm/processor.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/pgtable.h> | |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/dma.h> | |
34 | #include <asm/lowcore.h> | |
35 | #include <asm/tlb.h> | |
36 | #include <asm/tlbflush.h> | |
d882b172 | 37 | #include <asm/sections.h> |
a0616cde | 38 | #include <asm/ctl_reg.h> |
1da177e4 | 39 | |
1da177e4 | 40 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); |
1485c5c8 | 41 | |
238ec4ef | 42 | unsigned long empty_zero_page, zero_page_mask; |
1485c5c8 | 43 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 44 | |
5e249d6e | 45 | static unsigned long __init setup_zero_pages(void) |
238ec4ef MS |
46 | { |
47 | struct cpuid cpu_id; | |
48 | unsigned int order; | |
49 | unsigned long size; | |
50 | struct page *page; | |
51 | int i; | |
52 | ||
53 | get_cpu_id(&cpu_id); | |
54 | switch (cpu_id.machine) { | |
55 | case 0x9672: /* g5 */ | |
56 | case 0x2064: /* z900 */ | |
57 | case 0x2066: /* z900 */ | |
58 | case 0x2084: /* z990 */ | |
59 | case 0x2086: /* z990 */ | |
60 | case 0x2094: /* z9-109 */ | |
61 | case 0x2096: /* z9-109 */ | |
62 | order = 0; | |
63 | break; | |
64 | case 0x2097: /* z10 */ | |
65 | case 0x2098: /* z10 */ | |
66 | default: | |
67 | order = 2; | |
68 | break; | |
69 | } | |
70 | ||
71 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
72 | if (!empty_zero_page) | |
73 | panic("Out of memory in setup_zero_pages"); | |
74 | ||
75 | page = virt_to_page((void *) empty_zero_page); | |
76 | split_page(page, order); | |
77 | for (i = 1 << order; i > 0; i--) { | |
78 | SetPageReserved(page); | |
79 | page++; | |
80 | } | |
81 | ||
82 | size = PAGE_SIZE << order; | |
83 | zero_page_mask = (size - 1) & PAGE_MASK; | |
84 | ||
85 | return 1UL << order; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * paging_init() sets up the page tables | |
90 | */ | |
1da177e4 LT |
91 | void __init paging_init(void) |
92 | { | |
39b742f9 | 93 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14045ebf | 94 | unsigned long pgd_type, asce_bits; |
d882b172 | 95 | |
3610cce8 | 96 | init_mm.pgd = swapper_pg_dir; |
f4eb07c1 | 97 | #ifdef CONFIG_64BIT |
14045ebf MS |
98 | if (VMALLOC_END > (1UL << 42)) { |
99 | asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; | |
100 | pgd_type = _REGION2_ENTRY_EMPTY; | |
101 | } else { | |
102 | asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
103 | pgd_type = _REGION3_ENTRY_EMPTY; | |
104 | } | |
f4eb07c1 | 105 | #else |
14045ebf | 106 | asce_bits = _ASCE_TABLE_LENGTH; |
3610cce8 | 107 | pgd_type = _SEGMENT_ENTRY_EMPTY; |
f4eb07c1 | 108 | #endif |
14045ebf | 109 | S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
3610cce8 MS |
110 | clear_table((unsigned long *) init_mm.pgd, pgd_type, |
111 | sizeof(unsigned long)*2048); | |
f4eb07c1 | 112 | vmem_map_init(); |
1da177e4 | 113 | |
1da177e4 | 114 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
115 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
116 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
117 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
df9ee292 | 118 | arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); |
1da177e4 | 119 | |
050eef36 MS |
120 | atomic_set(&init_mm.context.attach_count, 1); |
121 | ||
17f34580 HC |
122 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
123 | sparse_init(); | |
39b742f9 HC |
124 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
125 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
126 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
127 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 128 | } |
1da177e4 LT |
129 | |
130 | void __init mem_init(void) | |
131 | { | |
132 | unsigned long codesize, reservedpages, datasize, initsize; | |
133 | ||
134 | max_mapnr = num_physpages = max_low_pfn; | |
135 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
136 | ||
45e576b1 MS |
137 | /* Setup guest page hinting */ |
138 | cmma_init(); | |
139 | ||
1da177e4 LT |
140 | /* this will put all low memory onto the freelists */ |
141 | totalram_pages += free_all_bootmem(); | |
238ec4ef | 142 | totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ |
1da177e4 LT |
143 | |
144 | reservedpages = 0; | |
145 | ||
146 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
147 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
148 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
149 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
cc013a88 | 150 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
151 | max_mapnr << (PAGE_SHIFT-10), |
152 | codesize >> 10, | |
153 | reservedpages << (PAGE_SHIFT-10), | |
154 | datasize >>10, | |
155 | initsize >> 10); | |
d882b172 | 156 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
162e006e HC |
157 | (unsigned long)&_stext, |
158 | PFN_ALIGN((unsigned long)&_eshared) - 1); | |
1da177e4 LT |
159 | } |
160 | ||
d96221ab | 161 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 | 162 | { |
d96221ab | 163 | unsigned long addr = begin; |
1da177e4 | 164 | |
d96221ab HC |
165 | if (begin >= end) |
166 | return; | |
167 | for (; addr < end; addr += PAGE_SIZE) { | |
1da177e4 | 168 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 169 | init_page_count(virt_to_page(addr)); |
d96221ab HC |
170 | memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM, |
171 | PAGE_SIZE); | |
1da177e4 LT |
172 | free_page(addr); |
173 | totalram_pages++; | |
d96221ab HC |
174 | } |
175 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
176 | } | |
177 | ||
178 | void free_initmem(void) | |
179 | { | |
180 | free_init_pages("unused kernel memory", | |
181 | (unsigned long)&__init_begin, | |
182 | (unsigned long)&__init_end); | |
1da177e4 LT |
183 | } |
184 | ||
185 | #ifdef CONFIG_BLK_DEV_INITRD | |
5e249d6e | 186 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
1da177e4 | 187 | { |
d96221ab | 188 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
189 | } |
190 | #endif | |
421c175c HC |
191 | |
192 | #ifdef CONFIG_MEMORY_HOTPLUG | |
193 | int arch_add_memory(int nid, u64 start, u64 size) | |
194 | { | |
892365ab GS |
195 | unsigned long zone_start_pfn, zone_end_pfn, nr_pages; |
196 | unsigned long start_pfn = PFN_DOWN(start); | |
197 | unsigned long size_pages = PFN_DOWN(size); | |
421c175c HC |
198 | struct zone *zone; |
199 | int rc; | |
200 | ||
421c175c HC |
201 | rc = vmem_add_mapping(start, size); |
202 | if (rc) | |
203 | return rc; | |
892365ab GS |
204 | for_each_zone(zone) { |
205 | if (zone_idx(zone) != ZONE_MOVABLE) { | |
206 | /* Add range within existing zone limits */ | |
207 | zone_start_pfn = zone->zone_start_pfn; | |
208 | zone_end_pfn = zone->zone_start_pfn + | |
209 | zone->spanned_pages; | |
210 | } else { | |
211 | /* Add remaining range to ZONE_MOVABLE */ | |
212 | zone_start_pfn = start_pfn; | |
213 | zone_end_pfn = start_pfn + size_pages; | |
214 | } | |
215 | if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) | |
216 | continue; | |
217 | nr_pages = (start_pfn + size_pages > zone_end_pfn) ? | |
218 | zone_end_pfn - start_pfn : size_pages; | |
219 | rc = __add_pages(nid, zone, start_pfn, nr_pages); | |
220 | if (rc) | |
221 | break; | |
222 | start_pfn += nr_pages; | |
223 | size_pages -= nr_pages; | |
224 | if (!size_pages) | |
225 | break; | |
226 | } | |
421c175c HC |
227 | if (rc) |
228 | vmem_remove_mapping(start, size); | |
229 | return rc; | |
230 | } | |
231 | #endif /* CONFIG_MEMORY_HOTPLUG */ |