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> |
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; | |
65 | ||
66 | printk("Mem-info:\n"); | |
67 | show_free_areas(); | |
68 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
69 | i = max_mapnr; | |
70 | while (i-- > 0) { | |
71 | total++; | |
72 | if (PageReserved(mem_map+i)) | |
73 | reserved++; | |
74 | else if (PageSwapCache(mem_map+i)) | |
75 | cached++; | |
76 | else if (page_count(mem_map+i)) | |
77 | shared += page_count(mem_map+i) - 1; | |
78 | } | |
79 | printk("%d pages of RAM\n",total); | |
80 | printk("%d reserved pages\n",reserved); | |
81 | printk("%d pages shared\n",shared); | |
82 | printk("%d pages swap cached\n",cached); | |
83 | } | |
84 | ||
c9e37353 | 85 | extern unsigned long __initdata zholes_size[]; |
1da177e4 LT |
86 | /* |
87 | * paging_init() sets up the page tables | |
88 | */ | |
89 | ||
347a8dc3 | 90 | #ifndef CONFIG_64BIT |
1da177e4 LT |
91 | void __init paging_init(void) |
92 | { | |
93 | pgd_t * pg_dir; | |
94 | pte_t * pg_table; | |
95 | pte_t pte; | |
96 | int i; | |
97 | unsigned long tmp; | |
98 | unsigned long pfn = 0; | |
99 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; | |
100 | static const int ssm_mask = 0x04000000L; | |
d882b172 | 101 | unsigned long ro_start_pfn, ro_end_pfn; |
9282ed92 | 102 | unsigned long zones_size[MAX_NR_ZONES]; |
d882b172 HC |
103 | |
104 | ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); | |
105 | ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); | |
1da177e4 | 106 | |
9282ed92 GS |
107 | memset(zones_size, 0, sizeof(zones_size)); |
108 | zones_size[ZONE_DMA] = max_low_pfn; | |
109 | free_area_init_node(0, &contig_page_data, zones_size, | |
110 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, | |
111 | zholes_size); | |
112 | ||
1da177e4 LT |
113 | /* unmap whole virtual address space */ |
114 | ||
115 | pg_dir = swapper_pg_dir; | |
116 | ||
9282ed92 GS |
117 | for (i = 0; i < PTRS_PER_PGD; i++) |
118 | pmd_clear((pmd_t *) pg_dir++); | |
1da177e4 LT |
119 | |
120 | /* | |
121 | * map whole physical memory to virtual memory (identity mapping) | |
122 | */ | |
123 | ||
124 | pg_dir = swapper_pg_dir; | |
125 | ||
126 | while (pfn < max_low_pfn) { | |
127 | /* | |
128 | * pg_table is physical at this point | |
129 | */ | |
3e03a2fc | 130 | pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
1da177e4 | 131 | |
9282ed92 | 132 | pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table); |
1da177e4 LT |
133 | pg_dir++; |
134 | ||
135 | for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { | |
d882b172 HC |
136 | if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
137 | pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); | |
138 | else | |
139 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
1da177e4 | 140 | if (pfn >= max_low_pfn) |
9282ed92 GS |
141 | pte_val(pte) = _PAGE_TYPE_EMPTY; |
142 | set_pte(pg_table, pte); | |
1da177e4 LT |
143 | pfn++; |
144 | } | |
145 | } | |
146 | ||
147 | S390_lowcore.kernel_asce = pgdir_k; | |
148 | ||
149 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
150 | __ctl_load(pgdir_k, 1, 1); |
151 | __ctl_load(pgdir_k, 7, 7); | |
152 | __ctl_load(pgdir_k, 13, 13); | |
153 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 LT |
154 | |
155 | local_flush_tlb(); | |
1da177e4 LT |
156 | return; |
157 | } | |
158 | ||
347a8dc3 | 159 | #else /* CONFIG_64BIT */ |
d882b172 | 160 | |
1da177e4 LT |
161 | void __init paging_init(void) |
162 | { | |
163 | pgd_t * pg_dir; | |
164 | pmd_t * pm_dir; | |
165 | pte_t * pt_dir; | |
166 | pte_t pte; | |
167 | int i,j,k; | |
168 | unsigned long pfn = 0; | |
169 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | | |
170 | _KERN_REGION_TABLE; | |
171 | static const int ssm_mask = 0x04000000L; | |
c9e37353 | 172 | unsigned long zones_size[MAX_NR_ZONES]; |
1da177e4 | 173 | unsigned long dma_pfn, high_pfn; |
d882b172 | 174 | unsigned long ro_start_pfn, ro_end_pfn; |
1da177e4 | 175 | |
c9e37353 | 176 | memset(zones_size, 0, sizeof(zones_size)); |
1da177e4 LT |
177 | dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; |
178 | high_pfn = max_low_pfn; | |
d882b172 HC |
179 | ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); |
180 | ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); | |
1da177e4 LT |
181 | |
182 | if (dma_pfn > high_pfn) | |
183 | zones_size[ZONE_DMA] = high_pfn; | |
184 | else { | |
185 | zones_size[ZONE_DMA] = dma_pfn; | |
186 | zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; | |
187 | } | |
188 | ||
189 | /* Initialize mem_map[]. */ | |
c9e37353 HC |
190 | free_area_init_node(0, &contig_page_data, zones_size, |
191 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
1da177e4 LT |
192 | |
193 | /* | |
194 | * map whole physical memory to virtual memory (identity mapping) | |
195 | */ | |
196 | ||
197 | pg_dir = swapper_pg_dir; | |
198 | ||
199 | for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { | |
200 | ||
201 | if (pfn >= max_low_pfn) { | |
202 | pgd_clear(pg_dir); | |
203 | continue; | |
204 | } | |
205 | ||
3e03a2fc | 206 | pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4); |
1da177e4 LT |
207 | pgd_populate(&init_mm, pg_dir, pm_dir); |
208 | ||
209 | for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { | |
210 | if (pfn >= max_low_pfn) { | |
211 | pmd_clear(pm_dir); | |
212 | continue; | |
213 | } | |
214 | ||
3e03a2fc | 215 | pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
1da177e4 LT |
216 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); |
217 | ||
218 | for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { | |
d882b172 HC |
219 | if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
220 | pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); | |
221 | else | |
222 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
9282ed92 GS |
223 | if (pfn >= max_low_pfn) |
224 | pte_val(pte) = _PAGE_TYPE_EMPTY; | |
1da177e4 LT |
225 | set_pte(pt_dir, pte); |
226 | pfn++; | |
227 | } | |
228 | } | |
229 | } | |
230 | ||
231 | S390_lowcore.kernel_asce = pgdir_k; | |
232 | ||
233 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
234 | __ctl_load(pgdir_k, 1, 1); |
235 | __ctl_load(pgdir_k, 7, 7); | |
236 | __ctl_load(pgdir_k, 13, 13); | |
237 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 LT |
238 | |
239 | local_flush_tlb(); | |
240 | ||
241 | return; | |
242 | } | |
347a8dc3 | 243 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
244 | |
245 | void __init mem_init(void) | |
246 | { | |
247 | unsigned long codesize, reservedpages, datasize, initsize; | |
248 | ||
249 | max_mapnr = num_physpages = max_low_pfn; | |
250 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
251 | ||
252 | /* clear the zero-page */ | |
253 | memset(empty_zero_page, 0, PAGE_SIZE); | |
254 | ||
255 | /* this will put all low memory onto the freelists */ | |
256 | totalram_pages += free_all_bootmem(); | |
257 | ||
258 | reservedpages = 0; | |
259 | ||
260 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
261 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
262 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
263 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
264 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
265 | max_mapnr << (PAGE_SHIFT-10), | |
266 | codesize >> 10, | |
267 | reservedpages << (PAGE_SHIFT-10), | |
268 | datasize >>10, | |
269 | initsize >> 10); | |
d882b172 HC |
270 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
271 | (unsigned long)&__start_rodata, | |
272 | PFN_ALIGN((unsigned long)&__end_rodata) - 1); | |
1da177e4 LT |
273 | } |
274 | ||
275 | void free_initmem(void) | |
276 | { | |
277 | unsigned long addr; | |
278 | ||
279 | addr = (unsigned long)(&__init_begin); | |
280 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
281 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 282 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
283 | free_page(addr); |
284 | totalram_pages++; | |
285 | } | |
286 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
287 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
288 | } | |
289 | ||
290 | #ifdef CONFIG_BLK_DEV_INITRD | |
291 | void free_initrd_mem(unsigned long start, unsigned long end) | |
292 | { | |
293 | if (start < end) | |
294 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
295 | for (; start < end; start += PAGE_SIZE) { | |
296 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 297 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
298 | free_page(start); |
299 | totalram_pages++; | |
300 | } | |
301 | } | |
302 | #endif |