Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
d882b172 | 26 | #include <linux/pfn.h> |
028d9b3c | 27 | #include <linux/poison.h> |
2b67fc46 | 28 | #include <linux/initrd.h> |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
1da177e4 LT |
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> | |
d882b172 | 39 | #include <asm/sections.h> |
1da177e4 LT |
40 | |
41 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
42 | ||
43 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); | |
1485c5c8 | 44 | |
1da177e4 | 45 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); |
1485c5c8 | 46 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 47 | |
1da177e4 LT |
48 | /* |
49 | * paging_init() sets up the page tables | |
50 | */ | |
1da177e4 LT |
51 | void __init paging_init(void) |
52 | { | |
f4eb07c1 | 53 | static const int ssm_mask = 0x04000000L; |
39b742f9 | 54 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
3610cce8 | 55 | unsigned long pgd_type; |
d882b172 | 56 | |
3610cce8 MS |
57 | init_mm.pgd = swapper_pg_dir; |
58 | S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK; | |
f4eb07c1 | 59 | #ifdef CONFIG_64BIT |
6252d702 MS |
60 | /* A three level page table (4TB) is enough for the kernel space. */ |
61 | S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; | |
62 | pgd_type = _REGION3_ENTRY_EMPTY; | |
f4eb07c1 | 63 | #else |
3610cce8 MS |
64 | S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH; |
65 | pgd_type = _SEGMENT_ENTRY_EMPTY; | |
f4eb07c1 | 66 | #endif |
3610cce8 MS |
67 | clear_table((unsigned long *) init_mm.pgd, pgd_type, |
68 | sizeof(unsigned long)*2048); | |
f4eb07c1 | 69 | vmem_map_init(); |
1da177e4 | 70 | |
1da177e4 | 71 | /* enable virtual mapping in kernel mode */ |
3610cce8 MS |
72 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); |
73 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
74 | __ctl_load(S390_lowcore.kernel_asce, 13, 13); | |
94c12cc7 | 75 | __raw_local_irq_ssm(ssm_mask); |
1da177e4 | 76 | |
17f34580 HC |
77 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
78 | sparse_init(); | |
39b742f9 | 79 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
118bcd31 | 80 | #ifdef CONFIG_ZONE_DMA |
39b742f9 | 81 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); |
118bcd31 | 82 | #endif |
39b742f9 HC |
83 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
84 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 85 | } |
1da177e4 LT |
86 | |
87 | void __init mem_init(void) | |
88 | { | |
89 | unsigned long codesize, reservedpages, datasize, initsize; | |
90 | ||
91 | max_mapnr = num_physpages = max_low_pfn; | |
92 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
93 | ||
94 | /* clear the zero-page */ | |
95 | memset(empty_zero_page, 0, PAGE_SIZE); | |
96 | ||
45e576b1 MS |
97 | /* Setup guest page hinting */ |
98 | cmma_init(); | |
99 | ||
1da177e4 LT |
100 | /* this will put all low memory onto the freelists */ |
101 | totalram_pages += free_all_bootmem(); | |
102 | ||
103 | reservedpages = 0; | |
104 | ||
105 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
106 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
107 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
108 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
cc013a88 | 109 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
110 | max_mapnr << (PAGE_SHIFT-10), |
111 | codesize >> 10, | |
112 | reservedpages << (PAGE_SHIFT-10), | |
113 | datasize >>10, | |
114 | initsize >> 10); | |
d882b172 | 115 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
162e006e HC |
116 | (unsigned long)&_stext, |
117 | PFN_ALIGN((unsigned long)&_eshared) - 1); | |
1da177e4 LT |
118 | } |
119 | ||
2485579b HC |
120 | #ifdef CONFIG_DEBUG_PAGEALLOC |
121 | void kernel_map_pages(struct page *page, int numpages, int enable) | |
122 | { | |
123 | pgd_t *pgd; | |
124 | pud_t *pud; | |
125 | pmd_t *pmd; | |
126 | pte_t *pte; | |
127 | unsigned long address; | |
128 | int i; | |
129 | ||
130 | for (i = 0; i < numpages; i++) { | |
131 | address = page_to_phys(page + i); | |
132 | pgd = pgd_offset_k(address); | |
133 | pud = pud_offset(pgd, address); | |
134 | pmd = pmd_offset(pud, address); | |
135 | pte = pte_offset_kernel(pmd, address); | |
136 | if (!enable) { | |
146e4b3c | 137 | ptep_invalidate(&init_mm, address, pte); |
2485579b HC |
138 | continue; |
139 | } | |
140 | *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW)); | |
141 | /* Flush cpu write queue. */ | |
142 | mb(); | |
143 | } | |
144 | } | |
145 | #endif | |
146 | ||
d96221ab | 147 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 | 148 | { |
d96221ab | 149 | unsigned long addr = begin; |
1da177e4 | 150 | |
d96221ab HC |
151 | if (begin >= end) |
152 | return; | |
153 | for (; addr < end; addr += PAGE_SIZE) { | |
1da177e4 | 154 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 155 | init_page_count(virt_to_page(addr)); |
d96221ab HC |
156 | memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM, |
157 | PAGE_SIZE); | |
1da177e4 LT |
158 | free_page(addr); |
159 | totalram_pages++; | |
d96221ab HC |
160 | } |
161 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); | |
162 | } | |
163 | ||
164 | void free_initmem(void) | |
165 | { | |
166 | free_init_pages("unused kernel memory", | |
167 | (unsigned long)&__init_begin, | |
168 | (unsigned long)&__init_end); | |
1da177e4 LT |
169 | } |
170 | ||
171 | #ifdef CONFIG_BLK_DEV_INITRD | |
172 | void free_initrd_mem(unsigned long start, unsigned long end) | |
173 | { | |
d96221ab | 174 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
175 | } |
176 | #endif | |
421c175c HC |
177 | |
178 | #ifdef CONFIG_MEMORY_HOTPLUG | |
179 | int arch_add_memory(int nid, u64 start, u64 size) | |
180 | { | |
181 | struct pglist_data *pgdat; | |
182 | struct zone *zone; | |
183 | int rc; | |
184 | ||
185 | pgdat = NODE_DATA(nid); | |
7e9238fb | 186 | zone = pgdat->node_zones + ZONE_MOVABLE; |
421c175c HC |
187 | rc = vmem_add_mapping(start, size); |
188 | if (rc) | |
189 | return rc; | |
c04fc586 | 190 | rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size)); |
421c175c HC |
191 | if (rc) |
192 | vmem_remove_mapping(start, size); | |
193 | return rc; | |
194 | } | |
195 | #endif /* CONFIG_MEMORY_HOTPLUG */ |