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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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/signal.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <linux/bootmem.h> | |
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> | |
37 | ||
38 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
39 | ||
40 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); | |
41 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
42 | ||
43 | void diag10(unsigned long addr) | |
44 | { | |
45 | if (addr >= 0x7ff00000) | |
46 | return; | |
347a8dc3 | 47 | #ifdef CONFIG_64BIT |
1da177e4 LT |
48 | asm volatile ( |
49 | " sam31\n" | |
50 | " diag %0,%0,0x10\n" | |
51 | "0: sam64\n" | |
52 | ".section __ex_table,\"a\"\n" | |
53 | " .align 8\n" | |
54 | " .quad 0b, 0b\n" | |
55 | ".previous\n" | |
56 | : : "a" (addr)); | |
57 | #else | |
58 | asm volatile ( | |
59 | " diag %0,%0,0x10\n" | |
60 | "0:\n" | |
61 | ".section __ex_table,\"a\"\n" | |
62 | " .align 4\n" | |
63 | " .long 0b, 0b\n" | |
64 | ".previous\n" | |
65 | : : "a" (addr)); | |
66 | #endif | |
67 | } | |
68 | ||
69 | void show_mem(void) | |
70 | { | |
71 | int i, total = 0, reserved = 0; | |
72 | int shared = 0, cached = 0; | |
73 | ||
74 | printk("Mem-info:\n"); | |
75 | show_free_areas(); | |
76 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
77 | i = max_mapnr; | |
78 | while (i-- > 0) { | |
79 | total++; | |
80 | if (PageReserved(mem_map+i)) | |
81 | reserved++; | |
82 | else if (PageSwapCache(mem_map+i)) | |
83 | cached++; | |
84 | else if (page_count(mem_map+i)) | |
85 | shared += page_count(mem_map+i) - 1; | |
86 | } | |
87 | printk("%d pages of RAM\n",total); | |
88 | printk("%d reserved pages\n",reserved); | |
89 | printk("%d pages shared\n",shared); | |
90 | printk("%d pages swap cached\n",cached); | |
91 | } | |
92 | ||
93 | /* References to section boundaries */ | |
94 | ||
95 | extern unsigned long _text; | |
96 | extern unsigned long _etext; | |
97 | extern unsigned long _edata; | |
98 | extern unsigned long __bss_start; | |
99 | extern unsigned long _end; | |
100 | ||
101 | extern unsigned long __init_begin; | |
102 | extern unsigned long __init_end; | |
103 | ||
c9e37353 | 104 | extern unsigned long __initdata zholes_size[]; |
1da177e4 LT |
105 | /* |
106 | * paging_init() sets up the page tables | |
107 | */ | |
108 | ||
347a8dc3 | 109 | #ifndef CONFIG_64BIT |
1da177e4 LT |
110 | void __init paging_init(void) |
111 | { | |
112 | pgd_t * pg_dir; | |
113 | pte_t * pg_table; | |
114 | pte_t pte; | |
115 | int i; | |
116 | unsigned long tmp; | |
117 | unsigned long pfn = 0; | |
118 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; | |
119 | static const int ssm_mask = 0x04000000L; | |
120 | ||
121 | /* unmap whole virtual address space */ | |
122 | ||
123 | pg_dir = swapper_pg_dir; | |
124 | ||
125 | for (i=0;i<KERNEL_PGD_PTRS;i++) | |
126 | pmd_clear((pmd_t*)pg_dir++); | |
127 | ||
128 | /* | |
129 | * map whole physical memory to virtual memory (identity mapping) | |
130 | */ | |
131 | ||
132 | pg_dir = swapper_pg_dir; | |
133 | ||
134 | while (pfn < max_low_pfn) { | |
135 | /* | |
136 | * pg_table is physical at this point | |
137 | */ | |
138 | pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
139 | ||
140 | pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); | |
141 | pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); | |
142 | pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); | |
143 | pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); | |
144 | pg_dir++; | |
145 | ||
146 | for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { | |
147 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
148 | if (pfn >= max_low_pfn) | |
149 | pte_clear(&init_mm, 0, &pte); | |
150 | set_pte(pg_table, pte); | |
151 | pfn++; | |
152 | } | |
153 | } | |
154 | ||
155 | S390_lowcore.kernel_asce = pgdir_k; | |
156 | ||
157 | /* enable virtual mapping in kernel mode */ | |
158 | __asm__ __volatile__(" LCTL 1,1,%0\n" | |
159 | " LCTL 7,7,%0\n" | |
160 | " LCTL 13,13,%0\n" | |
161 | " SSM %1" | |
162 | : : "m" (pgdir_k), "m" (ssm_mask)); | |
163 | ||
164 | local_flush_tlb(); | |
165 | ||
166 | { | |
c9e37353 | 167 | unsigned long zones_size[MAX_NR_ZONES]; |
1da177e4 | 168 | |
c9e37353 | 169 | memset(zones_size, 0, sizeof(zones_size)); |
1da177e4 | 170 | zones_size[ZONE_DMA] = max_low_pfn; |
c9e37353 HC |
171 | free_area_init_node(0, &contig_page_data, zones_size, |
172 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, | |
173 | zholes_size); | |
1da177e4 LT |
174 | } |
175 | return; | |
176 | } | |
177 | ||
347a8dc3 | 178 | #else /* CONFIG_64BIT */ |
1da177e4 LT |
179 | void __init paging_init(void) |
180 | { | |
181 | pgd_t * pg_dir; | |
182 | pmd_t * pm_dir; | |
183 | pte_t * pt_dir; | |
184 | pte_t pte; | |
185 | int i,j,k; | |
186 | unsigned long pfn = 0; | |
187 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | | |
188 | _KERN_REGION_TABLE; | |
189 | static const int ssm_mask = 0x04000000L; | |
190 | ||
c9e37353 | 191 | unsigned long zones_size[MAX_NR_ZONES]; |
1da177e4 LT |
192 | unsigned long dma_pfn, high_pfn; |
193 | ||
c9e37353 | 194 | memset(zones_size, 0, sizeof(zones_size)); |
1da177e4 LT |
195 | dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; |
196 | high_pfn = max_low_pfn; | |
197 | ||
198 | if (dma_pfn > high_pfn) | |
199 | zones_size[ZONE_DMA] = high_pfn; | |
200 | else { | |
201 | zones_size[ZONE_DMA] = dma_pfn; | |
202 | zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; | |
203 | } | |
204 | ||
205 | /* Initialize mem_map[]. */ | |
c9e37353 HC |
206 | free_area_init_node(0, &contig_page_data, zones_size, |
207 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
1da177e4 LT |
208 | |
209 | /* | |
210 | * map whole physical memory to virtual memory (identity mapping) | |
211 | */ | |
212 | ||
213 | pg_dir = swapper_pg_dir; | |
214 | ||
215 | for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { | |
216 | ||
217 | if (pfn >= max_low_pfn) { | |
218 | pgd_clear(pg_dir); | |
219 | continue; | |
220 | } | |
221 | ||
222 | pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4); | |
223 | pgd_populate(&init_mm, pg_dir, pm_dir); | |
224 | ||
225 | for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { | |
226 | if (pfn >= max_low_pfn) { | |
227 | pmd_clear(pm_dir); | |
228 | continue; | |
229 | } | |
230 | ||
231 | pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
232 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); | |
233 | ||
234 | for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { | |
235 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
236 | if (pfn >= max_low_pfn) { | |
237 | pte_clear(&init_mm, 0, &pte); | |
238 | continue; | |
239 | } | |
240 | set_pte(pt_dir, pte); | |
241 | pfn++; | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | S390_lowcore.kernel_asce = pgdir_k; | |
247 | ||
248 | /* enable virtual mapping in kernel mode */ | |
249 | __asm__ __volatile__("lctlg 1,1,%0\n\t" | |
250 | "lctlg 7,7,%0\n\t" | |
251 | "lctlg 13,13,%0\n\t" | |
252 | "ssm %1" | |
253 | : :"m" (pgdir_k), "m" (ssm_mask)); | |
254 | ||
255 | local_flush_tlb(); | |
256 | ||
257 | return; | |
258 | } | |
347a8dc3 | 259 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
260 | |
261 | void __init mem_init(void) | |
262 | { | |
263 | unsigned long codesize, reservedpages, datasize, initsize; | |
264 | ||
265 | max_mapnr = num_physpages = max_low_pfn; | |
266 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
267 | ||
268 | /* clear the zero-page */ | |
269 | memset(empty_zero_page, 0, PAGE_SIZE); | |
270 | ||
271 | /* this will put all low memory onto the freelists */ | |
272 | totalram_pages += free_all_bootmem(); | |
273 | ||
274 | reservedpages = 0; | |
275 | ||
276 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
277 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
278 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
279 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
280 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
281 | max_mapnr << (PAGE_SHIFT-10), | |
282 | codesize >> 10, | |
283 | reservedpages << (PAGE_SHIFT-10), | |
284 | datasize >>10, | |
285 | initsize >> 10); | |
286 | } | |
287 | ||
288 | void free_initmem(void) | |
289 | { | |
290 | unsigned long addr; | |
291 | ||
292 | addr = (unsigned long)(&__init_begin); | |
293 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
294 | ClearPageReserved(virt_to_page(addr)); | |
295 | set_page_count(virt_to_page(addr), 1); | |
296 | free_page(addr); | |
297 | totalram_pages++; | |
298 | } | |
299 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
300 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
301 | } | |
302 | ||
303 | #ifdef CONFIG_BLK_DEV_INITRD | |
304 | void free_initrd_mem(unsigned long start, unsigned long end) | |
305 | { | |
306 | if (start < end) | |
307 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
308 | for (; start < end; start += PAGE_SIZE) { | |
309 | ClearPageReserved(virt_to_page(start)); | |
310 | set_page_count(virt_to_page(start), 1); | |
311 | free_page(start); | |
312 | totalram_pages++; | |
313 | } | |
314 | } | |
315 | #endif |