x86, efi: Set runtime_version to the EFI spec revision
[linux/fpc-iii.git] / arch / s390 / mm / init.c
blobae672f41c464101a6d39727209441481d7775eff
1 /*
2 * S390 version
3 * Copyright IBM Corp. 1999
4 * Author(s): Hartmut Penner (hp@de.ibm.com)
6 * Derived from "arch/i386/mm/init.c"
7 * Copyright (C) 1995 Linus Torvalds
8 */
10 #include <linux/signal.h>
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/ptrace.h>
17 #include <linux/mman.h>
18 #include <linux/mm.h>
19 #include <linux/swap.h>
20 #include <linux/smp.h>
21 #include <linux/init.h>
22 #include <linux/pagemap.h>
23 #include <linux/bootmem.h>
24 #include <linux/pfn.h>
25 #include <linux/poison.h>
26 #include <linux/initrd.h>
27 #include <linux/export.h>
28 #include <linux/gfp.h>
29 #include <asm/processor.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>
37 #include <asm/sections.h>
38 #include <asm/ctl_reg.h>
40 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
42 unsigned long empty_zero_page, zero_page_mask;
43 EXPORT_SYMBOL(empty_zero_page);
45 static unsigned long __init setup_zero_pages(void)
47 struct cpuid cpu_id;
48 unsigned int order;
49 unsigned long size;
50 struct page *page;
51 int i;
53 get_cpu_id(&cpu_id);
54 switch (cpu_id.machine) {
55 case 0x9672: /* g5 */
56 case 0x2064: /* z900 */
57 case 0x2066: /* z900 */
58 case 0x2084: /* z990 */
59 case 0x2086: /* z990 */
60 case 0x2094: /* z9-109 */
61 case 0x2096: /* z9-109 */
62 order = 0;
63 break;
64 case 0x2097: /* z10 */
65 case 0x2098: /* z10 */
66 default:
67 order = 2;
68 break;
71 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
72 if (!empty_zero_page)
73 panic("Out of memory in setup_zero_pages");
75 page = virt_to_page((void *) empty_zero_page);
76 split_page(page, order);
77 for (i = 1 << order; i > 0; i--) {
78 SetPageReserved(page);
79 page++;
82 size = PAGE_SIZE << order;
83 zero_page_mask = (size - 1) & PAGE_MASK;
85 return 1UL << order;
89 * paging_init() sets up the page tables
91 void __init paging_init(void)
93 unsigned long max_zone_pfns[MAX_NR_ZONES];
94 unsigned long pgd_type, asce_bits;
96 init_mm.pgd = swapper_pg_dir;
97 #ifdef CONFIG_64BIT
98 if (VMALLOC_END > (1UL << 42)) {
99 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
100 pgd_type = _REGION2_ENTRY_EMPTY;
101 } else {
102 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
103 pgd_type = _REGION3_ENTRY_EMPTY;
105 #else
106 asce_bits = _ASCE_TABLE_LENGTH;
107 pgd_type = _SEGMENT_ENTRY_EMPTY;
108 #endif
109 S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
110 clear_table((unsigned long *) init_mm.pgd, pgd_type,
111 sizeof(unsigned long)*2048);
112 vmem_map_init();
114 /* enable virtual mapping in kernel mode */
115 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
116 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
117 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
118 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
120 atomic_set(&init_mm.context.attach_count, 1);
122 sparse_memory_present_with_active_regions(MAX_NUMNODES);
123 sparse_init();
124 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
125 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
126 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
127 free_area_init_nodes(max_zone_pfns);
130 void __init mem_init(void)
132 unsigned long codesize, reservedpages, datasize, initsize;
134 max_mapnr = num_physpages = max_low_pfn;
135 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
137 /* Setup guest page hinting */
138 cmma_init();
140 /* this will put all low memory onto the freelists */
141 totalram_pages += free_all_bootmem();
142 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
144 reservedpages = 0;
146 codesize = (unsigned long) &_etext - (unsigned long) &_text;
147 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
148 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
149 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
150 nr_free_pages() << (PAGE_SHIFT-10),
151 max_mapnr << (PAGE_SHIFT-10),
152 codesize >> 10,
153 reservedpages << (PAGE_SHIFT-10),
154 datasize >>10,
155 initsize >> 10);
156 printk("Write protected kernel read-only data: %#lx - %#lx\n",
157 (unsigned long)&_stext,
158 PFN_ALIGN((unsigned long)&_eshared) - 1);
161 void free_init_pages(char *what, unsigned long begin, unsigned long end)
163 unsigned long addr = begin;
165 if (begin >= end)
166 return;
167 for (; addr < end; addr += PAGE_SIZE) {
168 ClearPageReserved(virt_to_page(addr));
169 init_page_count(virt_to_page(addr));
170 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
171 PAGE_SIZE);
172 free_page(addr);
173 totalram_pages++;
175 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
178 void free_initmem(void)
180 free_init_pages("unused kernel memory",
181 (unsigned long)&__init_begin,
182 (unsigned long)&__init_end);
185 #ifdef CONFIG_BLK_DEV_INITRD
186 void __init free_initrd_mem(unsigned long start, unsigned long end)
188 free_init_pages("initrd memory", start, end);
190 #endif
192 #ifdef CONFIG_MEMORY_HOTPLUG
193 int arch_add_memory(int nid, u64 start, u64 size)
195 unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
196 unsigned long start_pfn = PFN_DOWN(start);
197 unsigned long size_pages = PFN_DOWN(size);
198 struct zone *zone;
199 int rc;
201 rc = vmem_add_mapping(start, size);
202 if (rc)
203 return rc;
204 for_each_zone(zone) {
205 if (zone_idx(zone) != ZONE_MOVABLE) {
206 /* Add range within existing zone limits */
207 zone_start_pfn = zone->zone_start_pfn;
208 zone_end_pfn = zone->zone_start_pfn +
209 zone->spanned_pages;
210 } else {
211 /* Add remaining range to ZONE_MOVABLE */
212 zone_start_pfn = start_pfn;
213 zone_end_pfn = start_pfn + size_pages;
215 if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
216 continue;
217 nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
218 zone_end_pfn - start_pfn : size_pages;
219 rc = __add_pages(nid, zone, start_pfn, nr_pages);
220 if (rc)
221 break;
222 start_pfn += nr_pages;
223 size_pages -= nr_pages;
224 if (!size_pages)
225 break;
227 if (rc)
228 vmem_remove_mapping(start, size);
229 return rc;
231 #endif /* CONFIG_MEMORY_HOTPLUG */