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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>
Heiko Carstens028d9b32006-12-08 15:56:13 +010027#include <linux/poison.h>
Heiko Carstens2b67fc42007-02-05 21:16:47 +010028#include <linux/initrd.h>
Heiko Carstens3a4c5d52011-07-30 09:25:15 +020029#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/processor.h>
32#include <asm/system.h>
33#include <asm/uaccess.h>
34#include <asm/pgtable.h>
35#include <asm/pgalloc.h>
36#include <asm/dma.h>
37#include <asm/lowcore.h>
38#include <asm/tlb.h>
39#include <asm/tlbflush.h>
Heiko Carstensd882b172006-07-01 04:36:31 -070040#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
Heiko Carstens1485c5c2009-03-26 15:24:04 +010043
Martin Schwidefsky238ec4e2010-10-25 16:10:07 +020044unsigned long empty_zero_page, zero_page_mask;
Heiko Carstens1485c5c2009-03-26 15:24:04 +010045EXPORT_SYMBOL(empty_zero_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Martin Schwidefsky238ec4e2010-10-25 16:10:07 +020047static unsigned long setup_zero_pages(void)
48{
49 struct cpuid cpu_id;
50 unsigned int order;
51 unsigned long size;
52 struct page *page;
53 int i;
54
55 get_cpu_id(&cpu_id);
56 switch (cpu_id.machine) {
57 case 0x9672: /* g5 */
58 case 0x2064: /* z900 */
59 case 0x2066: /* z900 */
60 case 0x2084: /* z990 */
61 case 0x2086: /* z990 */
62 case 0x2094: /* z9-109 */
63 case 0x2096: /* z9-109 */
64 order = 0;
65 break;
66 case 0x2097: /* z10 */
67 case 0x2098: /* z10 */
68 default:
69 order = 2;
70 break;
71 }
72
73 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
74 if (!empty_zero_page)
75 panic("Out of memory in setup_zero_pages");
76
77 page = virt_to_page((void *) empty_zero_page);
78 split_page(page, order);
79 for (i = 1 << order; i > 0; i--) {
80 SetPageReserved(page);
81 page++;
82 }
83
84 size = PAGE_SIZE << order;
85 zero_page_mask = (size - 1) & PAGE_MASK;
86
87 return 1UL << order;
88}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/*
91 * paging_init() sets up the page tables
92 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070093void __init paging_init(void)
94{
Heiko Carstens39b742f2006-12-08 15:56:10 +010095 unsigned long max_zone_pfns[MAX_NR_ZONES];
Martin Schwidefsky14045eb2011-12-27 11:27:07 +010096 unsigned long pgd_type, asce_bits;
Heiko Carstensd882b172006-07-01 04:36:31 -070097
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020098 init_mm.pgd = swapper_pg_dir;
Heiko Carstensf4eb07c2006-12-08 15:56:07 +010099#ifdef CONFIG_64BIT
Martin Schwidefsky14045eb2011-12-27 11:27:07 +0100100 if (VMALLOC_END > (1UL << 42)) {
101 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
102 pgd_type = _REGION2_ENTRY_EMPTY;
103 } else {
104 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
105 pgd_type = _REGION3_ENTRY_EMPTY;
106 }
Heiko Carstensf4eb07c2006-12-08 15:56:07 +0100107#else
Martin Schwidefsky14045eb2011-12-27 11:27:07 +0100108 asce_bits = _ASCE_TABLE_LENGTH;
Martin Schwidefsky3610cce2007-10-22 12:52:47 +0200109 pgd_type = _SEGMENT_ENTRY_EMPTY;
Heiko Carstensf4eb07c2006-12-08 15:56:07 +0100110#endif
Martin Schwidefsky14045eb2011-12-27 11:27:07 +0100111 S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
Martin Schwidefsky3610cce2007-10-22 12:52:47 +0200112 clear_table((unsigned long *) init_mm.pgd, pgd_type,
113 sizeof(unsigned long)*2048);
Heiko Carstensf4eb07c2006-12-08 15:56:07 +0100114 vmem_map_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 /* enable virtual mapping in kernel mode */
Martin Schwidefsky3610cce2007-10-22 12:52:47 +0200117 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
118 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
119 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
David Howellsdf9ee292010-10-07 14:08:55 +0100120 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Martin Schwidefsky050eef32010-08-24 09:26:21 +0200122 atomic_set(&init_mm.context.attach_count, 1);
123
Heiko Carstens17f34582008-04-30 13:38:47 +0200124 sparse_memory_present_with_active_regions(MAX_NUMNODES);
125 sparse_init();
Heiko Carstens39b742f2006-12-08 15:56:10 +0100126 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
127 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
128 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
129 free_area_init_nodes(max_zone_pfns);
Martin Schwidefsky92f842e2010-10-25 16:10:13 +0200130 fault_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133void __init mem_init(void)
134{
135 unsigned long codesize, reservedpages, datasize, initsize;
136
137 max_mapnr = num_physpages = max_low_pfn;
138 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
139
Martin Schwidefsky45e576b2008-05-07 09:22:59 +0200140 /* Setup guest page hinting */
141 cmma_init();
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 /* this will put all low memory onto the freelists */
144 totalram_pages += free_all_bootmem();
Martin Schwidefsky238ec4e2010-10-25 16:10:07 +0200145 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147 reservedpages = 0;
148
149 codesize = (unsigned long) &_etext - (unsigned long) &_text;
150 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
151 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
152 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700153 nr_free_pages() << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 max_mapnr << (PAGE_SHIFT-10),
155 codesize >> 10,
156 reservedpages << (PAGE_SHIFT-10),
157 datasize >>10,
158 initsize >> 10);
Heiko Carstensd882b172006-07-01 04:36:31 -0700159 printk("Write protected kernel read-only data: %#lx - %#lx\n",
Heiko Carstens162e0062007-02-05 21:18:41 +0100160 (unsigned long)&_stext,
161 PFN_ALIGN((unsigned long)&_eshared) - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
Heiko Carstens24855792008-02-05 16:50:37 +0100164#ifdef CONFIG_DEBUG_PAGEALLOC
165void kernel_map_pages(struct page *page, int numpages, int enable)
166{
167 pgd_t *pgd;
168 pud_t *pud;
169 pmd_t *pmd;
170 pte_t *pte;
171 unsigned long address;
172 int i;
173
174 for (i = 0; i < numpages; i++) {
175 address = page_to_phys(page + i);
176 pgd = pgd_offset_k(address);
177 pud = pud_offset(pgd, address);
178 pmd = pmd_offset(pud, address);
179 pte = pte_offset_kernel(pmd, address);
180 if (!enable) {
Martin Schwidefskyb2fa47e2011-05-23 10:24:40 +0200181 __ptep_ipte(address, pte);
182 pte_val(*pte) = _PAGE_TYPE_EMPTY;
Heiko Carstens24855792008-02-05 16:50:37 +0100183 continue;
184 }
185 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
186 /* Flush cpu write queue. */
187 mb();
188 }
189}
190#endif
191
Heiko Carstensd96221a2010-02-26 22:37:42 +0100192void free_init_pages(char *what, unsigned long begin, unsigned long end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Heiko Carstensd96221a2010-02-26 22:37:42 +0100194 unsigned long addr = begin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Heiko Carstensd96221a2010-02-26 22:37:42 +0100196 if (begin >= end)
197 return;
198 for (; addr < end; addr += PAGE_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800200 init_page_count(virt_to_page(addr));
Heiko Carstensd96221a2010-02-26 22:37:42 +0100201 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
202 PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 free_page(addr);
204 totalram_pages++;
Heiko Carstensd96221a2010-02-26 22:37:42 +0100205 }
206 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
207}
208
209void free_initmem(void)
210{
211 free_init_pages("unused kernel memory",
212 (unsigned long)&__init_begin,
213 (unsigned long)&__init_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
216#ifdef CONFIG_BLK_DEV_INITRD
217void free_initrd_mem(unsigned long start, unsigned long end)
218{
Heiko Carstensd96221a2010-02-26 22:37:42 +0100219 free_init_pages("initrd memory", start, end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221#endif
Heiko Carstens421c1752008-07-14 09:59:18 +0200222
223#ifdef CONFIG_MEMORY_HOTPLUG
224int arch_add_memory(int nid, u64 start, u64 size)
225{
Gerald Schaefer892365a2012-02-24 18:01:29 +0100226 unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
227 unsigned long start_pfn = PFN_DOWN(start);
228 unsigned long size_pages = PFN_DOWN(size);
Heiko Carstens421c1752008-07-14 09:59:18 +0200229 struct zone *zone;
230 int rc;
231
Heiko Carstens421c1752008-07-14 09:59:18 +0200232 rc = vmem_add_mapping(start, size);
233 if (rc)
234 return rc;
Gerald Schaefer892365a2012-02-24 18:01:29 +0100235 for_each_zone(zone) {
236 if (zone_idx(zone) != ZONE_MOVABLE) {
237 /* Add range within existing zone limits */
238 zone_start_pfn = zone->zone_start_pfn;
239 zone_end_pfn = zone->zone_start_pfn +
240 zone->spanned_pages;
241 } else {
242 /* Add remaining range to ZONE_MOVABLE */
243 zone_start_pfn = start_pfn;
244 zone_end_pfn = start_pfn + size_pages;
245 }
246 if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
247 continue;
248 nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
249 zone_end_pfn - start_pfn : size_pages;
250 rc = __add_pages(nid, zone, start_pfn, nr_pages);
251 if (rc)
252 break;
253 start_pfn += nr_pages;
254 size_pages -= nr_pages;
255 if (!size_pages)
256 break;
257 }
Heiko Carstens421c1752008-07-14 09:59:18 +0200258 if (rc)
259 vmem_remove_mapping(start, size);
260 return rc;
261}
262#endif /* CONFIG_MEMORY_HOTPLUG */