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; | |
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) { | |
0b2b6e1d | 72 | page = pfn_to_page(i); |
1da177e4 | 73 | total++; |
0b2b6e1d | 74 | if (PageReserved(page)) |
1da177e4 | 75 | reserved++; |
0b2b6e1d | 76 | else if (PageSwapCache(page)) |
1da177e4 | 77 | cached++; |
0b2b6e1d HC |
78 | else if (page_count(page)) |
79 | shared += page_count(page) - 1; | |
1da177e4 LT |
80 | } |
81 | printk("%d pages of RAM\n",total); | |
82 | printk("%d reserved pages\n",reserved); | |
83 | printk("%d pages shared\n",shared); | |
84 | printk("%d pages swap cached\n",cached); | |
85 | } | |
86 | ||
bcc8bcb1 | 87 | extern unsigned long __initdata zholes_size[]; |
1da177e4 LT |
88 | /* |
89 | * paging_init() sets up the page tables | |
90 | */ | |
91 | ||
347a8dc3 | 92 | #ifndef CONFIG_64BIT |
1da177e4 LT |
93 | void __init paging_init(void) |
94 | { | |
95 | pgd_t * pg_dir; | |
96 | pte_t * pg_table; | |
97 | pte_t pte; | |
98 | int i; | |
99 | unsigned long tmp; | |
100 | unsigned long pfn = 0; | |
101 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; | |
102 | static const int ssm_mask = 0x04000000L; | |
d882b172 | 103 | unsigned long ro_start_pfn, ro_end_pfn; |
bcc8bcb1 | 104 | unsigned long zones_size[MAX_NR_ZONES]; |
d882b172 HC |
105 | |
106 | ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); | |
107 | ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); | |
1da177e4 | 108 | |
bcc8bcb1 HC |
109 | memset(zones_size, 0, sizeof(zones_size)); |
110 | zones_size[ZONE_DMA] = max_low_pfn; | |
111 | free_area_init_node(0, &contig_page_data, zones_size, | |
112 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, | |
113 | zholes_size); | |
9282ed92 | 114 | |
1da177e4 LT |
115 | /* unmap whole virtual address space */ |
116 | ||
117 | pg_dir = swapper_pg_dir; | |
118 | ||
9282ed92 GS |
119 | for (i = 0; i < PTRS_PER_PGD; i++) |
120 | pmd_clear((pmd_t *) pg_dir++); | |
1da177e4 LT |
121 | |
122 | /* | |
123 | * map whole physical memory to virtual memory (identity mapping) | |
124 | */ | |
125 | ||
126 | pg_dir = swapper_pg_dir; | |
127 | ||
128 | while (pfn < max_low_pfn) { | |
129 | /* | |
130 | * pg_table is physical at this point | |
131 | */ | |
3e03a2fc | 132 | pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
1da177e4 | 133 | |
9282ed92 | 134 | pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table); |
1da177e4 LT |
135 | pg_dir++; |
136 | ||
137 | for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { | |
d882b172 HC |
138 | if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
139 | pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); | |
140 | else | |
141 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
1da177e4 | 142 | if (pfn >= max_low_pfn) |
9282ed92 GS |
143 | pte_val(pte) = _PAGE_TYPE_EMPTY; |
144 | set_pte(pg_table, pte); | |
1da177e4 LT |
145 | pfn++; |
146 | } | |
147 | } | |
148 | ||
149 | S390_lowcore.kernel_asce = pgdir_k; | |
150 | ||
151 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
152 | __ctl_load(pgdir_k, 1, 1); |
153 | __ctl_load(pgdir_k, 7, 7); | |
154 | __ctl_load(pgdir_k, 13, 13); | |
155 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 LT |
156 | |
157 | local_flush_tlb(); | |
1da177e4 LT |
158 | } |
159 | ||
347a8dc3 | 160 | #else /* CONFIG_64BIT */ |
d882b172 | 161 | |
1da177e4 LT |
162 | void __init paging_init(void) |
163 | { | |
164 | pgd_t * pg_dir; | |
165 | pmd_t * pm_dir; | |
166 | pte_t * pt_dir; | |
167 | pte_t pte; | |
168 | int i,j,k; | |
169 | unsigned long pfn = 0; | |
170 | unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | | |
171 | _KERN_REGION_TABLE; | |
172 | static const int ssm_mask = 0x04000000L; | |
bcc8bcb1 HC |
173 | unsigned long zones_size[MAX_NR_ZONES]; |
174 | unsigned long dma_pfn, high_pfn; | |
d882b172 | 175 | unsigned long ro_start_pfn, ro_end_pfn; |
1da177e4 | 176 | |
bcc8bcb1 HC |
177 | memset(zones_size, 0, sizeof(zones_size)); |
178 | dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; | |
179 | high_pfn = max_low_pfn; | |
d882b172 HC |
180 | ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); |
181 | ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); | |
1da177e4 | 182 | |
bcc8bcb1 HC |
183 | if (dma_pfn > high_pfn) |
184 | zones_size[ZONE_DMA] = high_pfn; | |
185 | else { | |
186 | zones_size[ZONE_DMA] = dma_pfn; | |
187 | zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; | |
188 | } | |
189 | ||
190 | /* Initialize mem_map[]. */ | |
191 | free_area_init_node(0, &contig_page_data, zones_size, | |
192 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
1da177e4 LT |
193 | |
194 | /* | |
195 | * map whole physical memory to virtual memory (identity mapping) | |
196 | */ | |
197 | ||
198 | pg_dir = swapper_pg_dir; | |
199 | ||
200 | for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { | |
201 | ||
202 | if (pfn >= max_low_pfn) { | |
203 | pgd_clear(pg_dir); | |
204 | continue; | |
205 | } | |
206 | ||
3e03a2fc | 207 | pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4); |
1da177e4 LT |
208 | pgd_populate(&init_mm, pg_dir, pm_dir); |
209 | ||
210 | for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { | |
211 | if (pfn >= max_low_pfn) { | |
212 | pmd_clear(pm_dir); | |
213 | continue; | |
214 | } | |
215 | ||
3e03a2fc | 216 | pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
1da177e4 LT |
217 | pmd_populate_kernel(&init_mm, pm_dir, pt_dir); |
218 | ||
219 | for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { | |
d882b172 HC |
220 | if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
221 | pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); | |
222 | else | |
223 | pte = pfn_pte(pfn, PAGE_KERNEL); | |
9282ed92 GS |
224 | if (pfn >= max_low_pfn) |
225 | pte_val(pte) = _PAGE_TYPE_EMPTY; | |
1da177e4 LT |
226 | set_pte(pt_dir, pte); |
227 | pfn++; | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | S390_lowcore.kernel_asce = pgdir_k; | |
233 | ||
234 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
235 | __ctl_load(pgdir_k, 1, 1); |
236 | __ctl_load(pgdir_k, 7, 7); | |
237 | __ctl_load(pgdir_k, 13, 13); | |
238 | __raw_local_irq_ssm(ssm_mask); | |
1da177e4 LT |
239 | |
240 | local_flush_tlb(); | |
1da177e4 | 241 | } |
347a8dc3 | 242 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
243 | |
244 | void __init mem_init(void) | |
245 | { | |
246 | unsigned long codesize, reservedpages, datasize, initsize; | |
247 | ||
248 | max_mapnr = num_physpages = max_low_pfn; | |
249 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
250 | ||
251 | /* clear the zero-page */ | |
252 | memset(empty_zero_page, 0, PAGE_SIZE); | |
253 | ||
254 | /* this will put all low memory onto the freelists */ | |
255 | totalram_pages += free_all_bootmem(); | |
256 | ||
257 | reservedpages = 0; | |
258 | ||
259 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
260 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
261 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
262 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", | |
263 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
264 | max_mapnr << (PAGE_SHIFT-10), | |
265 | codesize >> 10, | |
266 | reservedpages << (PAGE_SHIFT-10), | |
267 | datasize >>10, | |
268 | initsize >> 10); | |
d882b172 HC |
269 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
270 | (unsigned long)&__start_rodata, | |
271 | PFN_ALIGN((unsigned long)&__end_rodata) - 1); | |
1da177e4 LT |
272 | } |
273 | ||
274 | void free_initmem(void) | |
275 | { | |
276 | unsigned long addr; | |
277 | ||
278 | addr = (unsigned long)(&__init_begin); | |
279 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
280 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 281 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
282 | free_page(addr); |
283 | totalram_pages++; | |
284 | } | |
285 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
286 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
287 | } | |
288 | ||
289 | #ifdef CONFIG_BLK_DEV_INITRD | |
290 | void free_initrd_mem(unsigned long start, unsigned long end) | |
291 | { | |
292 | if (start < end) | |
293 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
294 | for (; start < end; start += PAGE_SIZE) { | |
295 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 296 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
297 | free_page(start); |
298 | totalram_pages++; | |
299 | } | |
300 | } | |
301 | #endif |