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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> |
1da177e4 LT |
27 | |
28 | #include <asm/processor.h> | |
29 | #include <asm/system.h> | |
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> |
1da177e4 LT |
38 | |
39 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
40 | ||
41 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); | |
42 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
43 | ||
44 | void diag10(unsigned long addr) | |
45 | { | |
46 | if (addr >= 0x7ff00000) | |
47 | return; | |
94c12cc7 | 48 | asm volatile( |
347a8dc3 | 49 | #ifdef CONFIG_64BIT |
94c12cc7 MS |
50 | " sam31\n" |
51 | " diag %0,%0,0x10\n" | |
52 | "0: sam64\n" | |
1da177e4 | 53 | #else |
94c12cc7 | 54 | " diag %0,%0,0x10\n" |
1da177e4 | 55 | "0:\n" |
1da177e4 | 56 | #endif |
94c12cc7 MS |
57 | EX_TABLE(0b,0b) |
58 | : : "a" (addr)); | |
1da177e4 LT |
59 | } |
60 | ||
61 | void show_mem(void) | |
62 | { | |
63 | int i, total = 0, reserved = 0; | |
64 | int shared = 0, cached = 0; | |
0b2b6e1d | 65 | struct page *page; |
1da177e4 LT |
66 | |
67 | printk("Mem-info:\n"); | |
68 | show_free_areas(); | |
69 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
70 | i = max_mapnr; | |
71 | while (i-- > 0) { | |
f4eb07c1 HC |
72 | if (!pfn_valid(i)) |
73 | continue; | |
0b2b6e1d | 74 | page = pfn_to_page(i); |
1da177e4 | 75 | total++; |
0b2b6e1d | 76 | if (PageReserved(page)) |
1da177e4 | 77 | reserved++; |
0b2b6e1d | 78 | else if (PageSwapCache(page)) |
1da177e4 | 79 | cached++; |
0b2b6e1d HC |
80 | else if (page_count(page)) |
81 | shared += page_count(page) - 1; | |
1da177e4 LT |
82 | } |
83 | printk("%d pages of RAM\n",total); | |
84 | printk("%d reserved pages\n",reserved); | |
85 | printk("%d pages shared\n",shared); | |
86 | printk("%d pages swap cached\n",cached); | |
87 | } | |
88 | ||
f4eb07c1 HC |
89 | static void __init setup_ro_region(void) |
90 | { | |
91 | pgd_t *pgd; | |
92 | pmd_t *pmd; | |
93 | pte_t *pte; | |
94 | pte_t new_pte; | |
95 | unsigned long address, end; | |
96 | ||
97 | address = ((unsigned long)&__start_rodata) & PAGE_MASK; | |
98 | end = PFN_ALIGN((unsigned long)&__end_rodata); | |
99 | ||
100 | for (; address < end; address += PAGE_SIZE) { | |
101 | pgd = pgd_offset_k(address); | |
102 | pmd = pmd_offset(pgd, address); | |
103 | pte = pte_offset_kernel(pmd, address); | |
104 | new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); | |
105 | set_pte(pte, new_pte); | |
106 | } | |
107 | } | |
108 | ||
f4eb07c1 | 109 | extern void vmem_map_init(void); |
39b742f9 | 110 | |
1da177e4 LT |
111 | /* |
112 | * paging_init() sets up the page tables | |
113 | */ | |
1da177e4 LT |
114 | void __init paging_init(void) |
115 | { | |
f4eb07c1 HC |
116 | pgd_t *pg_dir; |
117 | int i; | |
118 | unsigned long pgdir_k; | |
119 | static const int ssm_mask = 0x04000000L; | |
39b742f9 | 120 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
d882b172 | 121 | |
f4eb07c1 | 122 | pg_dir = swapper_pg_dir; |
1da177e4 | 123 | |
f4eb07c1 HC |
124 | #ifdef CONFIG_64BIT |
125 | pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; | |
9282ed92 | 126 | for (i = 0; i < PTRS_PER_PGD; i++) |
f4eb07c1 HC |
127 | pgd_clear(pg_dir + i); |
128 | #else | |
129 | pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; | |
130 | for (i = 0; i < PTRS_PER_PGD; i++) | |
131 | pmd_clear((pmd_t *)(pg_dir + i)); | |
132 | #endif | |
133 | vmem_map_init(); | |
134 | setup_ro_region(); | |
1da177e4 LT |
135 | |
136 | S390_lowcore.kernel_asce = pgdir_k; | |
137 | ||
138 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
139 | __ctl_load(pgdir_k, 1, 1); |
140 | __ctl_load(pgdir_k, 7, 7); | |
141 | __ctl_load(pgdir_k, 13, 13); | |
142 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 | 143 | |
39b742f9 HC |
144 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
145 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); | |
146 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
147 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 | 148 | } |
1da177e4 LT |
149 | |
150 | void __init mem_init(void) | |
151 | { | |
152 | unsigned long codesize, reservedpages, datasize, initsize; | |
153 | ||
154 | max_mapnr = num_physpages = max_low_pfn; | |
155 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
156 | ||
157 | /* clear the zero-page */ | |
158 | memset(empty_zero_page, 0, PAGE_SIZE); | |
159 | ||
160 | /* this will put all low memory onto the freelists */ | |
161 | totalram_pages += free_all_bootmem(); | |
162 | ||
163 | reservedpages = 0; | |
164 | ||
165 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
166 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
167 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
168 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
169 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
170 | max_mapnr << (PAGE_SHIFT-10), | |
171 | codesize >> 10, | |
172 | reservedpages << (PAGE_SHIFT-10), | |
173 | datasize >>10, | |
174 | initsize >> 10); | |
d882b172 HC |
175 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
176 | (unsigned long)&__start_rodata, | |
177 | PFN_ALIGN((unsigned long)&__end_rodata) - 1); | |
f4eb07c1 HC |
178 | printk("Virtual memmap size: %ldk\n", |
179 | (max_pfn * sizeof(struct page)) >> 10); | |
1da177e4 LT |
180 | } |
181 | ||
182 | void free_initmem(void) | |
183 | { | |
184 | unsigned long addr; | |
185 | ||
186 | addr = (unsigned long)(&__init_begin); | |
187 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
188 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 189 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
190 | free_page(addr); |
191 | totalram_pages++; | |
192 | } | |
193 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
194 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
195 | } | |
196 | ||
197 | #ifdef CONFIG_BLK_DEV_INITRD | |
198 | void free_initrd_mem(unsigned long start, unsigned long end) | |
199 | { | |
200 | if (start < end) | |
201 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
202 | for (; start < end; start += PAGE_SIZE) { | |
203 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 204 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
205 | free_page(start); |
206 | totalram_pages++; | |
207 | } | |
208 | } | |
209 | #endif |