blob: d998917187094c95408b0a62780fedb6ff527949 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#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>
Heiko Carstensd882b172006-07-01 04:36:31 -070026#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
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>
Heiko Carstensd882b172006-07-01 04:36:31 -070037#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
40
41pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
42char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
43
44void diag10(unsigned long addr)
45{
46 if (addr >= 0x7ff00000)
47 return;
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020048 asm volatile(
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080049#ifdef CONFIG_64BIT
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020050 " sam31\n"
51 " diag %0,%0,0x10\n"
52 "0: sam64\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#else
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020054 " diag %0,%0,0x10\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 "0:\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#endif
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020057 EX_TABLE(0b,0b)
58 : : "a" (addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60
61void show_mem(void)
62{
63 int i, total = 0, reserved = 0;
64 int shared = 0, cached = 0;
Heiko Carstens0b2b6e12006-10-04 20:02:23 +020065 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
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) {
Heiko Carstens0b2b6e12006-10-04 20:02:23 +020072 page = pfn_to_page(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 total++;
Heiko Carstens0b2b6e12006-10-04 20:02:23 +020074 if (PageReserved(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 reserved++;
Heiko Carstens0b2b6e12006-10-04 20:02:23 +020076 else if (PageSwapCache(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 cached++;
Heiko Carstens0b2b6e12006-10-04 20:02:23 +020078 else if (page_count(page))
79 shared += page_count(page) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 }
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/*
88 * paging_init() sets up the page tables
89 */
90
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080091#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070092void __init paging_init(void)
93{
94 pgd_t * pg_dir;
95 pte_t * pg_table;
96 pte_t pte;
97 int i;
98 unsigned long tmp;
99 unsigned long pfn = 0;
100 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
101 static const int ssm_mask = 0x04000000L;
Heiko Carstensd882b172006-07-01 04:36:31 -0700102 unsigned long ro_start_pfn, ro_end_pfn;
Heiko Carstens7676bef2006-10-04 20:02:19 +0200103 unsigned long max_zone_pfns[MAX_NR_ZONES];
Heiko Carstensd882b172006-07-01 04:36:31 -0700104
105 ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
106 ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Heiko Carstens7676bef2006-10-04 20:02:19 +0200108 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
109 max_zone_pfns[ZONE_DMA] = max_low_pfn;
110 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
111 free_area_init_nodes(max_zone_pfns);
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 /* unmap whole virtual address space */
114
115 pg_dir = swapper_pg_dir;
116
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200117 for (i = 0; i < PTRS_PER_PGD; i++)
118 pmd_clear((pmd_t *) pg_dir++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
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 */
Heiko Carstens3e03a2f2006-08-16 13:49:37 +0200130 pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200132 pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 pg_dir++;
134
135 for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
Heiko Carstensd882b172006-07-01 04:36:31 -0700136 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (pfn >= max_low_pfn)
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200141 pte_val(pte) = _PAGE_TYPE_EMPTY;
142 set_pte(pg_table, pte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 pfn++;
144 }
145 }
146
147 S390_lowcore.kernel_asce = pgdir_k;
148
149 /* enable virtual mapping in kernel mode */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200150 __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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 local_flush_tlb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800158#else /* CONFIG_64BIT */
Heiko Carstensd882b172006-07-01 04:36:31 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160void __init paging_init(void)
161{
162 pgd_t * pg_dir;
163 pmd_t * pm_dir;
164 pte_t * pt_dir;
165 pte_t pte;
166 int i,j,k;
167 unsigned long pfn = 0;
168 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
169 _KERN_REGION_TABLE;
170 static const int ssm_mask = 0x04000000L;
Heiko Carstensd882b172006-07-01 04:36:31 -0700171 unsigned long ro_start_pfn, ro_end_pfn;
Heiko Carstens7676bef2006-10-04 20:02:19 +0200172 unsigned long max_zone_pfns[MAX_NR_ZONES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Heiko Carstensd882b172006-07-01 04:36:31 -0700174 ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
175 ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Heiko Carstens7676bef2006-10-04 20:02:19 +0200177 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
178 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
179 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
180 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 /*
183 * map whole physical memory to virtual memory (identity mapping)
184 */
185
186 pg_dir = swapper_pg_dir;
187
188 for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
189
190 if (pfn >= max_low_pfn) {
191 pgd_clear(pg_dir);
192 continue;
193 }
194
Heiko Carstens3e03a2f2006-08-16 13:49:37 +0200195 pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 pgd_populate(&init_mm, pg_dir, pm_dir);
197
198 for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
199 if (pfn >= max_low_pfn) {
200 pmd_clear(pm_dir);
201 continue;
202 }
203
Heiko Carstens3e03a2f2006-08-16 13:49:37 +0200204 pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
206
207 for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
Heiko Carstensd882b172006-07-01 04:36:31 -0700208 if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
209 pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
210 else
211 pte = pfn_pte(pfn, PAGE_KERNEL);
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200212 if (pfn >= max_low_pfn)
213 pte_val(pte) = _PAGE_TYPE_EMPTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 set_pte(pt_dir, pte);
215 pfn++;
216 }
217 }
218 }
219
220 S390_lowcore.kernel_asce = pgdir_k;
221
222 /* enable virtual mapping in kernel mode */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200223 __ctl_load(pgdir_k, 1, 1);
224 __ctl_load(pgdir_k, 7, 7);
225 __ctl_load(pgdir_k, 13, 13);
226 __raw_local_irq_ssm(ssm_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 local_flush_tlb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800230#endif /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232void __init mem_init(void)
233{
234 unsigned long codesize, reservedpages, datasize, initsize;
235
236 max_mapnr = num_physpages = max_low_pfn;
237 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
238
239 /* clear the zero-page */
240 memset(empty_zero_page, 0, PAGE_SIZE);
241
242 /* this will put all low memory onto the freelists */
243 totalram_pages += free_all_bootmem();
244
245 reservedpages = 0;
246
247 codesize = (unsigned long) &_etext - (unsigned long) &_text;
248 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
249 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
250 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
251 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
252 max_mapnr << (PAGE_SHIFT-10),
253 codesize >> 10,
254 reservedpages << (PAGE_SHIFT-10),
255 datasize >>10,
256 initsize >> 10);
Heiko Carstensd882b172006-07-01 04:36:31 -0700257 printk("Write protected kernel read-only data: %#lx - %#lx\n",
258 (unsigned long)&__start_rodata,
259 PFN_ALIGN((unsigned long)&__end_rodata) - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
262void free_initmem(void)
263{
264 unsigned long addr;
265
266 addr = (unsigned long)(&__init_begin);
267 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
268 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800269 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 free_page(addr);
271 totalram_pages++;
272 }
273 printk ("Freeing unused kernel memory: %ldk freed\n",
274 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
275}
276
277#ifdef CONFIG_BLK_DEV_INITRD
278void free_initrd_mem(unsigned long start, unsigned long end)
279{
280 if (start < end)
281 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
282 for (; start < end; start += PAGE_SIZE) {
283 ClearPageReserved(virt_to_page(start));
Nick Piggin7835e982006-03-22 00:08:40 -0800284 init_page_count(virt_to_page(start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 free_page(start);
286 totalram_pages++;
287 }
288}
289#endif