blob: 94b8ba2ec8575d814613bab79fa191ba5a2564ca [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>
Heiko Carstens028d9b32006-12-08 15:56:13 +010027#include <linux/poison.h>
Heiko Carstens2b67fc42007-02-05 21:16:47 +010028#include <linux/initrd.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/processor.h>
31#include <asm/system.h>
32#include <asm/uaccess.h>
33#include <asm/pgtable.h>
34#include <asm/pgalloc.h>
35#include <asm/dma.h>
36#include <asm/lowcore.h>
37#include <asm/tlb.h>
38#include <asm/tlbflush.h>
Heiko Carstensd882b172006-07-01 04:36:31 -070039#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
42
43pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
Heiko Carstens1485c5c2009-03-26 15:24:04 +010044
Linus Torvalds1da177e2005-04-16 15:20:36 -070045char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
Heiko Carstens1485c5c2009-03-26 15:24:04 +010046EXPORT_SYMBOL(empty_zero_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/*
49 * paging_init() sets up the page tables
50 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051void __init paging_init(void)
52{
Heiko Carstens39b742f2006-12-08 15:56:10 +010053 unsigned long max_zone_pfns[MAX_NR_ZONES];
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020054 unsigned long pgd_type;
Heiko Carstensd882b172006-07-01 04:36:31 -070055
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020056 init_mm.pgd = swapper_pg_dir;
57 S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
Heiko Carstensf4eb07c2006-12-08 15:56:07 +010058#ifdef CONFIG_64BIT
Martin Schwidefsky6252d702008-02-09 18:24:37 +010059 /* A three level page table (4TB) is enough for the kernel space. */
60 S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
61 pgd_type = _REGION3_ENTRY_EMPTY;
Heiko Carstensf4eb07c2006-12-08 15:56:07 +010062#else
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020063 S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
64 pgd_type = _SEGMENT_ENTRY_EMPTY;
Heiko Carstensf4eb07c2006-12-08 15:56:07 +010065#endif
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020066 clear_table((unsigned long *) init_mm.pgd, pgd_type,
67 sizeof(unsigned long)*2048);
Heiko Carstensf4eb07c2006-12-08 15:56:07 +010068 vmem_map_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 /* enable virtual mapping in kernel mode */
Martin Schwidefsky3610cce2007-10-22 12:52:47 +020071 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
72 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
73 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
David Howellsdf9ee292010-10-07 14:08:55 +010074 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Martin Schwidefsky050eef32010-08-24 09:26:21 +020076 atomic_set(&init_mm.context.attach_count, 1);
77
Heiko Carstens17f34582008-04-30 13:38:47 +020078 sparse_memory_present_with_active_regions(MAX_NUMNODES);
79 sparse_init();
Heiko Carstens39b742f2006-12-08 15:56:10 +010080 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Heiko Carstens118bcd32007-02-21 10:55:12 +010081#ifdef CONFIG_ZONE_DMA
Heiko Carstens39b742f2006-12-08 15:56:10 +010082 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
Heiko Carstens118bcd32007-02-21 10:55:12 +010083#endif
Heiko Carstens39b742f2006-12-08 15:56:10 +010084 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
85 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88void __init mem_init(void)
89{
90 unsigned long codesize, reservedpages, datasize, initsize;
91
92 max_mapnr = num_physpages = max_low_pfn;
93 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
94
95 /* clear the zero-page */
96 memset(empty_zero_page, 0, PAGE_SIZE);
97
Martin Schwidefsky45e576b2008-05-07 09:22:59 +020098 /* Setup guest page hinting */
99 cmma_init();
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 /* this will put all low memory onto the freelists */
102 totalram_pages += free_all_bootmem();
103
104 reservedpages = 0;
105
106 codesize = (unsigned long) &_etext - (unsigned long) &_text;
107 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
108 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
109 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700110 nr_free_pages() << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 max_mapnr << (PAGE_SHIFT-10),
112 codesize >> 10,
113 reservedpages << (PAGE_SHIFT-10),
114 datasize >>10,
115 initsize >> 10);
Heiko Carstensd882b172006-07-01 04:36:31 -0700116 printk("Write protected kernel read-only data: %#lx - %#lx\n",
Heiko Carstens162e0062007-02-05 21:18:41 +0100117 (unsigned long)&_stext,
118 PFN_ALIGN((unsigned long)&_eshared) - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Heiko Carstens24855792008-02-05 16:50:37 +0100121#ifdef CONFIG_DEBUG_PAGEALLOC
122void kernel_map_pages(struct page *page, int numpages, int enable)
123{
124 pgd_t *pgd;
125 pud_t *pud;
126 pmd_t *pmd;
127 pte_t *pte;
128 unsigned long address;
129 int i;
130
131 for (i = 0; i < numpages; i++) {
132 address = page_to_phys(page + i);
133 pgd = pgd_offset_k(address);
134 pud = pud_offset(pgd, address);
135 pmd = pmd_offset(pud, address);
136 pte = pte_offset_kernel(pmd, address);
137 if (!enable) {
Martin Schwidefsky146e4b32008-02-09 18:24:35 +0100138 ptep_invalidate(&init_mm, address, pte);
Heiko Carstens24855792008-02-05 16:50:37 +0100139 continue;
140 }
141 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
142 /* Flush cpu write queue. */
143 mb();
144 }
145}
146#endif
147
Heiko Carstensd96221a2010-02-26 22:37:42 +0100148void free_init_pages(char *what, unsigned long begin, unsigned long end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Heiko Carstensd96221a2010-02-26 22:37:42 +0100150 unsigned long addr = begin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Heiko Carstensd96221a2010-02-26 22:37:42 +0100152 if (begin >= end)
153 return;
154 for (; addr < end; addr += PAGE_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800156 init_page_count(virt_to_page(addr));
Heiko Carstensd96221a2010-02-26 22:37:42 +0100157 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
158 PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 free_page(addr);
160 totalram_pages++;
Heiko Carstensd96221a2010-02-26 22:37:42 +0100161 }
162 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
163}
164
165void free_initmem(void)
166{
167 free_init_pages("unused kernel memory",
168 (unsigned long)&__init_begin,
169 (unsigned long)&__init_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
172#ifdef CONFIG_BLK_DEV_INITRD
173void free_initrd_mem(unsigned long start, unsigned long end)
174{
Heiko Carstensd96221a2010-02-26 22:37:42 +0100175 free_init_pages("initrd memory", start, end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177#endif
Heiko Carstens421c1752008-07-14 09:59:18 +0200178
179#ifdef CONFIG_MEMORY_HOTPLUG
180int arch_add_memory(int nid, u64 start, u64 size)
181{
182 struct pglist_data *pgdat;
183 struct zone *zone;
184 int rc;
185
186 pgdat = NODE_DATA(nid);
Gerald Schaefer7e9238f2008-08-01 16:39:16 +0200187 zone = pgdat->node_zones + ZONE_MOVABLE;
Heiko Carstens421c1752008-07-14 09:59:18 +0200188 rc = vmem_add_mapping(start, size);
189 if (rc)
190 return rc;
Gary Hadec04fc582009-01-06 14:39:14 -0800191 rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
Heiko Carstens421c1752008-07-14 09:59:18 +0200192 if (rc)
193 vmem_remove_mapping(start, size);
194 return rc;
195}
196#endif /* CONFIG_MEMORY_HOTPLUG */