blob: 127044e1707cd075fc7717b3a38321e3b6688ba2 [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;
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
Heiko Carstensc9e37352005-05-01 08:58:57 -070085extern unsigned long __initdata zholes_size[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070086/*
87 * paging_init() sets up the page tables
88 */
89
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080090#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070091void __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;
Heiko Carstensd882b172006-07-01 04:36:31 -0700101 unsigned long ro_start_pfn, ro_end_pfn;
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200102 unsigned long zones_size[MAX_NR_ZONES];
Heiko Carstensd882b172006-07-01 04:36:31 -0700103
104 ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
105 ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200107 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
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 return;
157}
158
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800159#else /* CONFIG_64BIT */
Heiko Carstensd882b172006-07-01 04:36:31 -0700160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161void __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;
Heiko Carstensc9e37352005-05-01 08:58:57 -0700172 unsigned long zones_size[MAX_NR_ZONES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 unsigned long dma_pfn, high_pfn;
Heiko Carstensd882b172006-07-01 04:36:31 -0700174 unsigned long ro_start_pfn, ro_end_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Heiko Carstensc9e37352005-05-01 08:58:57 -0700176 memset(zones_size, 0, sizeof(zones_size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
178 high_pfn = max_low_pfn;
Heiko Carstensd882b172006-07-01 04:36:31 -0700179 ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
180 ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
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[]. */
Heiko Carstensc9e37352005-05-01 08:58:57 -0700190 free_area_init_node(0, &contig_page_data, zones_size,
191 __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
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
Heiko Carstens3e03a2f2006-08-16 13:49:37 +0200206 pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 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
Heiko Carstens3e03a2f2006-08-16 13:49:37 +0200215 pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
217
218 for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
Heiko Carstensd882b172006-07-01 04:36:31 -0700219 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);
Gerald Schaefer9282ed92006-09-20 15:59:37 +0200223 if (pfn >= max_low_pfn)
224 pte_val(pte) = _PAGE_TYPE_EMPTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 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 */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200234 __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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 local_flush_tlb();
240
241 return;
242}
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800243#endif /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245void __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);
Heiko Carstensd882b172006-07-01 04:36:31 -0700270 printk("Write protected kernel read-only data: %#lx - %#lx\n",
271 (unsigned long)&__start_rodata,
272 PFN_ALIGN((unsigned long)&__end_rodata) - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
274
275void 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));
Nick Piggin7835e982006-03-22 00:08:40 -0800282 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 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
291void 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));
Nick Piggin7835e982006-03-22 00:08:40 -0800297 init_page_count(virt_to_page(start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 free_page(start);
299 totalram_pages++;
300 }
301}
302#endif