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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | /* * S390 version * Copyright IBM Corp. 1999 * Author(s): Hartmut Penner (hp@de.ibm.com) * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1995 Linus Torvalds */ #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <linux/ptrace.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/pagemap.h> #include <linux/bootmem.h> #include <linux/memory.h> #include <linux/pfn.h> #include <linux/poison.h> #include <linux/initrd.h> #include <linux/export.h> #include <linux/gfp.h> #include <asm/processor.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/dma.h> #include <asm/lowcore.h> #include <asm/tlb.h> #include <asm/tlbflush.h> #include <asm/sections.h> #include <asm/ctl_reg.h> #include <asm/sclp.h> pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); unsigned long empty_zero_page, zero_page_mask; EXPORT_SYMBOL(empty_zero_page); static void __init setup_zero_pages(void) { struct cpuid cpu_id; unsigned int order; struct page *page; int i; get_cpu_id(&cpu_id); switch (cpu_id.machine) { case 0x9672: /* g5 */ case 0x2064: /* z900 */ case 0x2066: /* z900 */ case 0x2084: /* z990 */ case 0x2086: /* z990 */ case 0x2094: /* z9-109 */ case 0x2096: /* z9-109 */ order = 0; break; case 0x2097: /* z10 */ case 0x2098: /* z10 */ case 0x2817: /* z196 */ case 0x2818: /* z196 */ order = 2; break; case 0x2827: /* zEC12 */ case 0x2828: /* zEC12 */ default: order = 5; break; } /* Limit number of empty zero pages for small memory sizes */ if (order > 2 && totalram_pages <= 16384) order = 2; empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); if (!empty_zero_page) panic("Out of memory in setup_zero_pages"); page = virt_to_page((void *) empty_zero_page); split_page(page, order); for (i = 1 << order; i > 0; i--) { mark_page_reserved(page); page++; } zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; } /* * paging_init() sets up the page tables */ void __init paging_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES]; unsigned long pgd_type, asce_bits; init_mm.pgd = swapper_pg_dir; #ifdef CONFIG_64BIT if (VMALLOC_END > (1UL << 42)) { asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; pgd_type = _REGION2_ENTRY_EMPTY; } else { asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; pgd_type = _REGION3_ENTRY_EMPTY; } #else asce_bits = _ASCE_TABLE_LENGTH; pgd_type = _SEGMENT_ENTRY_EMPTY; #endif S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; clear_table((unsigned long *) init_mm.pgd, pgd_type, sizeof(unsigned long)*2048); vmem_map_init(); /* enable virtual mapping in kernel mode */ __ctl_load(S390_lowcore.kernel_asce, 1, 1); __ctl_load(S390_lowcore.kernel_asce, 7, 7); __ctl_load(S390_lowcore.kernel_asce, 13, 13); arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); atomic_set(&init_mm.context.attach_count, 1); sparse_memory_present_with_active_regions(MAX_NUMNODES); sparse_init(); memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); max_zone_pfns[ZONE_NORMAL] = max_low_pfn; free_area_init_nodes(max_zone_pfns); } void __init mem_init(void) { max_mapnr = max_low_pfn; high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); /* Setup guest page hinting */ cmma_init(); /* this will put all low memory onto the freelists */ free_all_bootmem(); setup_zero_pages(); /* Setup zeroed pages. */ mem_init_print_info(NULL); printk("Write protected kernel read-only data: %#lx - %#lx\n", (unsigned long)&_stext, PFN_ALIGN((unsigned long)&_eshared) - 1); } void free_initmem(void) { free_initmem_default(POISON_FREE_INITMEM); } #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, "initrd"); } #endif #ifdef CONFIG_MEMORY_HOTPLUG int arch_add_memory(int nid, u64 start, u64 size) { unsigned long zone_start_pfn, zone_end_pfn, nr_pages; unsigned long start_pfn = PFN_DOWN(start); unsigned long size_pages = PFN_DOWN(size); struct zone *zone; int rc; rc = vmem_add_mapping(start, size); if (rc) return rc; for_each_zone(zone) { if (zone_idx(zone) != ZONE_MOVABLE) { /* Add range within existing zone limits */ zone_start_pfn = zone->zone_start_pfn; zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; } else { /* Add remaining range to ZONE_MOVABLE */ zone_start_pfn = start_pfn; zone_end_pfn = start_pfn + size_pages; } if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) continue; nr_pages = (start_pfn + size_pages > zone_end_pfn) ? zone_end_pfn - start_pfn : size_pages; rc = __add_pages(nid, zone, start_pfn, nr_pages); if (rc) break; start_pfn += nr_pages; size_pages -= nr_pages; if (!size_pages) break; } if (rc) vmem_remove_mapping(start, size); return rc; } unsigned long memory_block_size_bytes(void) { /* * Make sure the memory block size is always greater * or equal than the memory increment size. */ return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm()); } #ifdef CONFIG_MEMORY_HOTREMOVE int arch_remove_memory(u64 start, u64 size) { /* * There is no hardware or firmware interface which could trigger a * hot memory remove on s390. So there is nothing that needs to be * implemented. */ return -EBUSY; } #endif #endif /* CONFIG_MEMORY_HOTPLUG */ |