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1 | /* |
2 | * arch/s390/mm/init.c |
3 | * |
4 | * S390 version |
5 | * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
6 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
7 | * |
8 | * Derived from "arch/i386/mm/init.c" |
9 | * Copyright (C) 1995 Linus Torvalds |
10 | */ |
11 | |
12 | #include <linux/signal.h> |
13 | #include <linux/sched.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/errno.h> |
16 | #include <linux/string.h> |
17 | #include <linux/types.h> |
18 | #include <linux/ptrace.h> |
19 | #include <linux/mman.h> |
20 | #include <linux/mm.h> |
21 | #include <linux/swap.h> |
22 | #include <linux/smp.h> |
23 | #include <linux/init.h> |
24 | #include <linux/pagemap.h> |
25 | #include <linux/bootmem.h> |
26 | #include <linux/pfn.h> |
27 | #include <linux/poison.h> |
28 | #include <linux/initrd.h> |
29 | #include <linux/gfp.h> |
30 | #include <asm/processor.h> |
31 | #include <asm/system.h> |
32 | #include <asm/uaccess.h> |
33 | #include <asm/pgtable.h> |
34 | #include <asm/pgalloc.h> |
35 | #include <asm/dma.h> |
36 | #include <asm/lowcore.h> |
37 | #include <asm/tlb.h> |
38 | #include <asm/tlbflush.h> |
39 | #include <asm/sections.h> |
40 | |
41 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); |
42 | |
43 | unsigned long empty_zero_page, zero_page_mask; |
44 | EXPORT_SYMBOL(empty_zero_page); |
45 | |
46 | static unsigned long setup_zero_pages(void) |
47 | { |
48 | struct cpuid cpu_id; |
49 | unsigned int order; |
50 | unsigned long size; |
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 */ |
67 | default: |
68 | order = 2; |
69 | break; |
70 | } |
71 | |
72 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); |
73 | if (!empty_zero_page) |
74 | panic("Out of memory in setup_zero_pages"); |
75 | |
76 | page = virt_to_page((void *) empty_zero_page); |
77 | split_page(page, order); |
78 | for (i = 1 << order; i > 0; i--) { |
79 | SetPageReserved(page); |
80 | page++; |
81 | } |
82 | |
83 | size = PAGE_SIZE << order; |
84 | zero_page_mask = (size - 1) & PAGE_MASK; |
85 | |
86 | return 1UL << order; |
87 | } |
88 | |
89 | /* |
90 | * paging_init() sets up the page tables |
91 | */ |
92 | void __init paging_init(void) |
93 | { |
94 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
95 | unsigned long pgd_type; |
96 | |
97 | init_mm.pgd = swapper_pg_dir; |
98 | S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK; |
99 | #ifdef CONFIG_64BIT |
100 | /* A three level page table (4TB) is enough for the kernel space. */ |
101 | S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; |
102 | pgd_type = _REGION3_ENTRY_EMPTY; |
103 | #else |
104 | S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH; |
105 | pgd_type = _SEGMENT_ENTRY_EMPTY; |
106 | #endif |
107 | clear_table((unsigned long *) init_mm.pgd, pgd_type, |
108 | sizeof(unsigned long)*2048); |
109 | vmem_map_init(); |
110 | |
111 | /* enable virtual mapping in kernel mode */ |
112 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
113 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); |
114 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); |
115 | arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); |
116 | |
117 | atomic_set(&init_mm.context.attach_count, 1); |
118 | |
119 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
120 | sparse_init(); |
121 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
122 | #ifdef CONFIG_ZONE_DMA |
123 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); |
124 | #endif |
125 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
126 | free_area_init_nodes(max_zone_pfns); |
127 | fault_init(); |
128 | } |
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 | |
137 | /* Setup guest page hinting */ |
138 | cmma_init(); |
139 | |
140 | /* this will put all low memory onto the freelists */ |
141 | totalram_pages += free_all_bootmem(); |
142 | totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ |
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", |
150 | nr_free_pages() << (PAGE_SHIFT-10), |
151 | max_mapnr << (PAGE_SHIFT-10), |
152 | codesize >> 10, |
153 | reservedpages << (PAGE_SHIFT-10), |
154 | datasize >>10, |
155 | initsize >> 10); |
156 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
157 | (unsigned long)&_stext, |
158 | PFN_ALIGN((unsigned long)&_eshared) - 1); |
159 | } |
160 | |
161 | #ifdef CONFIG_DEBUG_PAGEALLOC |
162 | void kernel_map_pages(struct page *page, int numpages, int enable) |
163 | { |
164 | pgd_t *pgd; |
165 | pud_t *pud; |
166 | pmd_t *pmd; |
167 | pte_t *pte; |
168 | unsigned long address; |
169 | int i; |
170 | |
171 | for (i = 0; i < numpages; i++) { |
172 | address = page_to_phys(page + i); |
173 | pgd = pgd_offset_k(address); |
174 | pud = pud_offset(pgd, address); |
175 | pmd = pmd_offset(pud, address); |
176 | pte = pte_offset_kernel(pmd, address); |
177 | if (!enable) { |
178 | ptep_invalidate(&init_mm, address, pte); |
179 | continue; |
180 | } |
181 | *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW)); |
182 | /* Flush cpu write queue. */ |
183 | mb(); |
184 | } |
185 | } |
186 | #endif |
187 | |
188 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
189 | { |
190 | unsigned long addr = begin; |
191 | |
192 | if (begin >= end) |
193 | return; |
194 | for (; addr < end; addr += PAGE_SIZE) { |
195 | ClearPageReserved(virt_to_page(addr)); |
196 | init_page_count(virt_to_page(addr)); |
197 | memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM, |
198 | PAGE_SIZE); |
199 | free_page(addr); |
200 | totalram_pages++; |
201 | } |
202 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
203 | } |
204 | |
205 | void free_initmem(void) |
206 | { |
207 | free_init_pages("unused kernel memory", |
208 | (unsigned long)&__init_begin, |
209 | (unsigned long)&__init_end); |
210 | } |
211 | |
212 | #ifdef CONFIG_BLK_DEV_INITRD |
213 | void free_initrd_mem(unsigned long start, unsigned long end) |
214 | { |
215 | free_init_pages("initrd memory", start, end); |
216 | } |
217 | #endif |
218 | |
219 | #ifdef CONFIG_MEMORY_HOTPLUG |
220 | int arch_add_memory(int nid, u64 start, u64 size) |
221 | { |
222 | struct pglist_data *pgdat; |
223 | struct zone *zone; |
224 | int rc; |
225 | |
226 | pgdat = NODE_DATA(nid); |
227 | zone = pgdat->node_zones + ZONE_MOVABLE; |
228 | rc = vmem_add_mapping(start, size); |
229 | if (rc) |
230 | return rc; |
231 | rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size)); |
232 | if (rc) |
233 | vmem_remove_mapping(start, size); |
234 | return rc; |
235 | } |
236 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
237 |
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