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Linux/arch/s390/mm/init.c

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  1 /*
  2  *  S390 version
  3  *    Copyright IBM Corp. 1999
  4  *    Author(s): Hartmut Penner (hp@de.ibm.com)
  5  *
  6  *  Derived from "arch/i386/mm/init.c"
  7  *    Copyright (C) 1995  Linus Torvalds
  8  */
  9 
 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/memory.h>
 25 #include <linux/pfn.h>
 26 #include <linux/poison.h>
 27 #include <linux/initrd.h>
 28 #include <linux/export.h>
 29 #include <linux/gfp.h>
 30 #include <asm/processor.h>
 31 #include <asm/uaccess.h>
 32 #include <asm/pgtable.h>
 33 #include <asm/pgalloc.h>
 34 #include <asm/dma.h>
 35 #include <asm/lowcore.h>
 36 #include <asm/tlb.h>
 37 #include <asm/tlbflush.h>
 38 #include <asm/sections.h>
 39 #include <asm/ctl_reg.h>
 40 #include <asm/sclp.h>
 41 
 42 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
 43 
 44 unsigned long empty_zero_page, zero_page_mask;
 45 EXPORT_SYMBOL(empty_zero_page);
 46 
 47 static void __init setup_zero_pages(void)
 48 {
 49         struct cpuid cpu_id;
 50         unsigned int order;
 51         struct page *page;
 52         int i;
 53 
 54         get_cpu_id(&cpu_id);
 55         switch (cpu_id.machine) {
 56         case 0x9672:    /* g5 */
 57         case 0x2064:    /* z900 */
 58         case 0x2066:    /* z900 */
 59         case 0x2084:    /* z990 */
 60         case 0x2086:    /* z990 */
 61         case 0x2094:    /* z9-109 */
 62         case 0x2096:    /* z9-109 */
 63                 order = 0;
 64                 break;
 65         case 0x2097:    /* z10 */
 66         case 0x2098:    /* z10 */
 67         case 0x2817:    /* z196 */
 68         case 0x2818:    /* z196 */
 69                 order = 2;
 70                 break;
 71         case 0x2827:    /* zEC12 */
 72         case 0x2828:    /* zEC12 */
 73         default:
 74                 order = 5;
 75                 break;
 76         }
 77         /* Limit number of empty zero pages for small memory sizes */
 78         if (order > 2 && totalram_pages <= 16384)
 79                 order = 2;
 80 
 81         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 82         if (!empty_zero_page)
 83                 panic("Out of memory in setup_zero_pages");
 84 
 85         page = virt_to_page((void *) empty_zero_page);
 86         split_page(page, order);
 87         for (i = 1 << order; i > 0; i--) {
 88                 mark_page_reserved(page);
 89                 page++;
 90         }
 91 
 92         zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 93 }
 94 
 95 /*
 96  * paging_init() sets up the page tables
 97  */
 98 void __init paging_init(void)
 99 {
100         unsigned long max_zone_pfns[MAX_NR_ZONES];
101         unsigned long pgd_type, asce_bits;
102 
103         init_mm.pgd = swapper_pg_dir;
104 #ifdef CONFIG_64BIT
105         if (VMALLOC_END > (1UL << 42)) {
106                 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
107                 pgd_type = _REGION2_ENTRY_EMPTY;
108         } else {
109                 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
110                 pgd_type = _REGION3_ENTRY_EMPTY;
111         }
112 #else
113         asce_bits = _ASCE_TABLE_LENGTH;
114         pgd_type = _SEGMENT_ENTRY_EMPTY;
115 #endif
116         S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
117         clear_table((unsigned long *) init_mm.pgd, pgd_type,
118                     sizeof(unsigned long)*2048);
119         vmem_map_init();
120 
121         /* enable virtual mapping in kernel mode */
122         __ctl_load(S390_lowcore.kernel_asce, 1, 1);
123         __ctl_load(S390_lowcore.kernel_asce, 7, 7);
124         __ctl_load(S390_lowcore.kernel_asce, 13, 13);
125         arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
126 
127         atomic_set(&init_mm.context.attach_count, 1);
128 
129         sparse_memory_present_with_active_regions(MAX_NUMNODES);
130         sparse_init();
131         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
132         max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
133         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
134         free_area_init_nodes(max_zone_pfns);
135 }
136 
137 void __init mem_init(void)
138 {
139         max_mapnr = max_low_pfn;
140         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
141 
142         /* Setup guest page hinting */
143         cmma_init();
144 
145         /* this will put all low memory onto the freelists */
146         free_all_bootmem();
147         setup_zero_pages();     /* Setup zeroed pages. */
148 
149         mem_init_print_info(NULL);
150         printk("Write protected kernel read-only data: %#lx - %#lx\n",
151                (unsigned long)&_stext,
152                PFN_ALIGN((unsigned long)&_eshared) - 1);
153 }
154 
155 void free_initmem(void)
156 {
157         free_initmem_default(POISON_FREE_INITMEM);
158 }
159 
160 #ifdef CONFIG_BLK_DEV_INITRD
161 void __init free_initrd_mem(unsigned long start, unsigned long end)
162 {
163         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
164                            "initrd");
165 }
166 #endif
167 
168 #ifdef CONFIG_MEMORY_HOTPLUG
169 int arch_add_memory(int nid, u64 start, u64 size)
170 {
171         unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
172         unsigned long start_pfn = PFN_DOWN(start);
173         unsigned long size_pages = PFN_DOWN(size);
174         struct zone *zone;
175         int rc;
176 
177         rc = vmem_add_mapping(start, size);
178         if (rc)
179                 return rc;
180         for_each_zone(zone) {
181                 if (zone_idx(zone) != ZONE_MOVABLE) {
182                         /* Add range within existing zone limits */
183                         zone_start_pfn = zone->zone_start_pfn;
184                         zone_end_pfn = zone->zone_start_pfn +
185                                        zone->spanned_pages;
186                 } else {
187                         /* Add remaining range to ZONE_MOVABLE */
188                         zone_start_pfn = start_pfn;
189                         zone_end_pfn = start_pfn + size_pages;
190                 }
191                 if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
192                         continue;
193                 nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
194                            zone_end_pfn - start_pfn : size_pages;
195                 rc = __add_pages(nid, zone, start_pfn, nr_pages);
196                 if (rc)
197                         break;
198                 start_pfn += nr_pages;
199                 size_pages -= nr_pages;
200                 if (!size_pages)
201                         break;
202         }
203         if (rc)
204                 vmem_remove_mapping(start, size);
205         return rc;
206 }
207 
208 unsigned long memory_block_size_bytes(void)
209 {
210         /*
211          * Make sure the memory block size is always greater
212          * or equal than the memory increment size.
213          */
214         return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
215 }
216 
217 #ifdef CONFIG_MEMORY_HOTREMOVE
218 int arch_remove_memory(u64 start, u64 size)
219 {
220         /*
221          * There is no hardware or firmware interface which could trigger a
222          * hot memory remove on s390. So there is nothing that needs to be
223          * implemented.
224          */
225         return -EBUSY;
226 }
227 #endif
228 #endif /* CONFIG_MEMORY_HOTPLUG */
229 

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