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> |
1da177e4 LT |
29 | #include <asm/processor.h> |
30 | #include <asm/system.h> | |
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> |
1da177e4 LT |
39 | |
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | ||
42 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); | |
43 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
44 | ||
45 | void diag10(unsigned long addr) | |
46 | { | |
47 | if (addr >= 0x7ff00000) | |
48 | return; | |
94c12cc7 | 49 | asm volatile( |
347a8dc3 | 50 | #ifdef CONFIG_64BIT |
94c12cc7 MS |
51 | " sam31\n" |
52 | " diag %0,%0,0x10\n" | |
53 | "0: sam64\n" | |
1da177e4 | 54 | #else |
94c12cc7 | 55 | " diag %0,%0,0x10\n" |
1da177e4 | 56 | "0:\n" |
1da177e4 | 57 | #endif |
94c12cc7 MS |
58 | EX_TABLE(0b,0b) |
59 | : : "a" (addr)); | |
1da177e4 LT |
60 | } |
61 | ||
62 | void show_mem(void) | |
63 | { | |
64 | int i, total = 0, reserved = 0; | |
65 | int shared = 0, cached = 0; | |
0b2b6e1d | 66 | struct page *page; |
1da177e4 LT |
67 | |
68 | printk("Mem-info:\n"); | |
69 | show_free_areas(); | |
70 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
71 | i = max_mapnr; | |
72 | while (i-- > 0) { | |
f4eb07c1 HC |
73 | if (!pfn_valid(i)) |
74 | continue; | |
0b2b6e1d | 75 | page = pfn_to_page(i); |
1da177e4 | 76 | total++; |
0b2b6e1d | 77 | if (PageReserved(page)) |
1da177e4 | 78 | reserved++; |
0b2b6e1d | 79 | else if (PageSwapCache(page)) |
1da177e4 | 80 | cached++; |
0b2b6e1d HC |
81 | else if (page_count(page)) |
82 | shared += page_count(page) - 1; | |
1da177e4 LT |
83 | } |
84 | printk("%d pages of RAM\n",total); | |
85 | printk("%d reserved pages\n",reserved); | |
86 | printk("%d pages shared\n",shared); | |
87 | printk("%d pages swap cached\n",cached); | |
88 | } | |
89 | ||
f4eb07c1 HC |
90 | static void __init setup_ro_region(void) |
91 | { | |
92 | pgd_t *pgd; | |
93 | pmd_t *pmd; | |
94 | pte_t *pte; | |
95 | pte_t new_pte; | |
96 | unsigned long address, end; | |
97 | ||
162e006e HC |
98 | address = ((unsigned long)&_stext) & PAGE_MASK; |
99 | end = PFN_ALIGN((unsigned long)&_eshared); | |
f4eb07c1 HC |
100 | |
101 | for (; address < end; address += PAGE_SIZE) { | |
102 | pgd = pgd_offset_k(address); | |
103 | pmd = pmd_offset(pgd, address); | |
104 | pte = pte_offset_kernel(pmd, address); | |
105 | new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); | |
c1821c2e | 106 | *pte = new_pte; |
f4eb07c1 HC |
107 | } |
108 | } | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * paging_init() sets up the page tables | |
112 | */ | |
1da177e4 LT |
113 | void __init paging_init(void) |
114 | { | |
f4eb07c1 HC |
115 | pgd_t *pg_dir; |
116 | int i; | |
117 | unsigned long pgdir_k; | |
118 | static const int ssm_mask = 0x04000000L; | |
39b742f9 | 119 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
d882b172 | 120 | |
f4eb07c1 | 121 | pg_dir = swapper_pg_dir; |
1da177e4 | 122 | |
f4eb07c1 HC |
123 | #ifdef CONFIG_64BIT |
124 | pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; | |
9282ed92 | 125 | for (i = 0; i < PTRS_PER_PGD; i++) |
c1821c2e | 126 | pgd_clear_kernel(pg_dir + i); |
f4eb07c1 HC |
127 | #else |
128 | pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; | |
129 | for (i = 0; i < PTRS_PER_PGD; i++) | |
c1821c2e | 130 | pmd_clear_kernel((pmd_t *)(pg_dir + i)); |
f4eb07c1 HC |
131 | #endif |
132 | vmem_map_init(); | |
133 | setup_ro_region(); | |
1da177e4 LT |
134 | |
135 | S390_lowcore.kernel_asce = pgdir_k; | |
136 | ||
137 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
138 | __ctl_load(pgdir_k, 1, 1); |
139 | __ctl_load(pgdir_k, 7, 7); | |
140 | __ctl_load(pgdir_k, 13, 13); | |
141 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 | 142 | |
39b742f9 HC |
143 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
144 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
145 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
146 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 147 | } |
1da177e4 LT |
148 | |
149 | void __init mem_init(void) | |
150 | { | |
151 | unsigned long codesize, reservedpages, datasize, initsize; | |
152 | ||
153 | max_mapnr = num_physpages = max_low_pfn; | |
154 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
155 | ||
156 | /* clear the zero-page */ | |
157 | memset(empty_zero_page, 0, PAGE_SIZE); | |
158 | ||
159 | /* this will put all low memory onto the freelists */ | |
160 | totalram_pages += free_all_bootmem(); | |
161 | ||
162 | reservedpages = 0; | |
163 | ||
164 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
165 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
166 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
167 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
168 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
169 | max_mapnr << (PAGE_SHIFT-10), | |
170 | codesize >> 10, | |
171 | reservedpages << (PAGE_SHIFT-10), | |
172 | datasize >>10, | |
173 | initsize >> 10); | |
d882b172 | 174 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
162e006e HC |
175 | (unsigned long)&_stext, |
176 | PFN_ALIGN((unsigned long)&_eshared) - 1); | |
1da177e4 LT |
177 | } |
178 | ||
179 | void free_initmem(void) | |
180 | { | |
181 | unsigned long addr; | |
182 | ||
183 | addr = (unsigned long)(&__init_begin); | |
184 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
185 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 186 | init_page_count(virt_to_page(addr)); |
028d9b3c | 187 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
1da177e4 LT |
188 | free_page(addr); |
189 | totalram_pages++; | |
190 | } | |
191 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
192 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
193 | } | |
194 | ||
195 | #ifdef CONFIG_BLK_DEV_INITRD | |
196 | void free_initrd_mem(unsigned long start, unsigned long end) | |
197 | { | |
198 | if (start < end) | |
199 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
200 | for (; start < end; start += PAGE_SIZE) { | |
201 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 202 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
203 | free_page(start); |
204 | totalram_pages++; | |
205 | } | |
206 | } | |
207 | #endif |