11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * S390 version 3a53c8fabSHeiko Carstens * Copyright IBM Corp. 1999 41da177e4SLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Derived from "arch/i386/mm/init.c" 71da177e4SLinus Torvalds * Copyright (C) 1995 Linus Torvalds 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/signal.h> 111da177e4SLinus Torvalds #include <linux/sched.h> 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 141da177e4SLinus Torvalds #include <linux/string.h> 151da177e4SLinus Torvalds #include <linux/types.h> 161da177e4SLinus Torvalds #include <linux/ptrace.h> 171da177e4SLinus Torvalds #include <linux/mman.h> 181da177e4SLinus Torvalds #include <linux/mm.h> 191da177e4SLinus Torvalds #include <linux/swap.h> 201da177e4SLinus Torvalds #include <linux/smp.h> 211da177e4SLinus Torvalds #include <linux/init.h> 221da177e4SLinus Torvalds #include <linux/pagemap.h> 231da177e4SLinus Torvalds #include <linux/bootmem.h> 24d882b172SHeiko Carstens #include <linux/pfn.h> 25028d9b3cSHeiko Carstens #include <linux/poison.h> 262b67fc46SHeiko Carstens #include <linux/initrd.h> 273a4c5d59SHeiko Carstens #include <linux/export.h> 285a0e3ad6STejun Heo #include <linux/gfp.h> 291da177e4SLinus Torvalds #include <asm/processor.h> 301da177e4SLinus Torvalds #include <asm/uaccess.h> 311da177e4SLinus Torvalds #include <asm/pgtable.h> 321da177e4SLinus Torvalds #include <asm/pgalloc.h> 331da177e4SLinus Torvalds #include <asm/dma.h> 341da177e4SLinus Torvalds #include <asm/lowcore.h> 351da177e4SLinus Torvalds #include <asm/tlb.h> 361da177e4SLinus Torvalds #include <asm/tlbflush.h> 37d882b172SHeiko Carstens #include <asm/sections.h> 38a0616cdeSDavid Howells #include <asm/ctl_reg.h> 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 411485c5c8SHeiko Carstens 42238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask; 431485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page); 441da177e4SLinus Torvalds 455e249d6eSHeiko Carstens static unsigned long __init setup_zero_pages(void) 46238ec4efSMartin Schwidefsky { 47238ec4efSMartin Schwidefsky struct cpuid cpu_id; 48238ec4efSMartin Schwidefsky unsigned int order; 49238ec4efSMartin Schwidefsky unsigned long size; 50238ec4efSMartin Schwidefsky struct page *page; 51238ec4efSMartin Schwidefsky int i; 52238ec4efSMartin Schwidefsky 53238ec4efSMartin Schwidefsky get_cpu_id(&cpu_id); 54238ec4efSMartin Schwidefsky switch (cpu_id.machine) { 55238ec4efSMartin Schwidefsky case 0x9672: /* g5 */ 56238ec4efSMartin Schwidefsky case 0x2064: /* z900 */ 57238ec4efSMartin Schwidefsky case 0x2066: /* z900 */ 58238ec4efSMartin Schwidefsky case 0x2084: /* z990 */ 59238ec4efSMartin Schwidefsky case 0x2086: /* z990 */ 60238ec4efSMartin Schwidefsky case 0x2094: /* z9-109 */ 61238ec4efSMartin Schwidefsky case 0x2096: /* z9-109 */ 62238ec4efSMartin Schwidefsky order = 0; 63238ec4efSMartin Schwidefsky break; 64238ec4efSMartin Schwidefsky case 0x2097: /* z10 */ 65238ec4efSMartin Schwidefsky case 0x2098: /* z10 */ 66238ec4efSMartin Schwidefsky default: 67238ec4efSMartin Schwidefsky order = 2; 68238ec4efSMartin Schwidefsky break; 69238ec4efSMartin Schwidefsky } 70238ec4efSMartin Schwidefsky 71238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 72238ec4efSMartin Schwidefsky if (!empty_zero_page) 73238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages"); 74238ec4efSMartin Schwidefsky 75238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page); 76238ec4efSMartin Schwidefsky split_page(page, order); 77238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) { 78238ec4efSMartin Schwidefsky SetPageReserved(page); 79238ec4efSMartin Schwidefsky page++; 80238ec4efSMartin Schwidefsky } 81238ec4efSMartin Schwidefsky 82238ec4efSMartin Schwidefsky size = PAGE_SIZE << order; 83238ec4efSMartin Schwidefsky zero_page_mask = (size - 1) & PAGE_MASK; 84238ec4efSMartin Schwidefsky 85238ec4efSMartin Schwidefsky return 1UL << order; 86238ec4efSMartin Schwidefsky } 87238ec4efSMartin Schwidefsky 881da177e4SLinus Torvalds /* 891da177e4SLinus Torvalds * paging_init() sets up the page tables 901da177e4SLinus Torvalds */ 911da177e4SLinus Torvalds void __init paging_init(void) 921da177e4SLinus Torvalds { 9339b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 9414045ebfSMartin Schwidefsky unsigned long pgd_type, asce_bits; 951da177e4SLinus Torvalds 963610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 97f4eb07c1SHeiko Carstens #ifdef CONFIG_64BIT 9814045ebfSMartin Schwidefsky if (VMALLOC_END > (1UL << 42)) { 9914045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; 10014045ebfSMartin Schwidefsky pgd_type = _REGION2_ENTRY_EMPTY; 10114045ebfSMartin Schwidefsky } else { 10214045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 1036252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 10414045ebfSMartin Schwidefsky } 105f4eb07c1SHeiko Carstens #else 10614045ebfSMartin Schwidefsky asce_bits = _ASCE_TABLE_LENGTH; 1073610cce8SMartin Schwidefsky pgd_type = _SEGMENT_ENTRY_EMPTY; 108f4eb07c1SHeiko Carstens #endif 10914045ebfSMartin Schwidefsky S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 1103610cce8SMartin Schwidefsky clear_table((unsigned long *) init_mm.pgd, pgd_type, 1113610cce8SMartin Schwidefsky sizeof(unsigned long)*2048); 112f4eb07c1SHeiko Carstens vmem_map_init(); 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 1153610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1163610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1173610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 118df9ee292SDavid Howells arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); 1191da177e4SLinus Torvalds 120050eef36SMartin Schwidefsky atomic_set(&init_mm.context.attach_count, 1); 121050eef36SMartin Schwidefsky 12217f34580SHeiko Carstens sparse_memory_present_with_active_regions(MAX_NUMNODES); 12317f34580SHeiko Carstens sparse_init(); 12439b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 12539b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 12639b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 12739b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds void __init mem_init(void) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds unsigned long codesize, reservedpages, datasize, initsize; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds max_mapnr = num_physpages = max_low_pfn; 1351da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1361da177e4SLinus Torvalds 13745e576b1SMartin Schwidefsky /* Setup guest page hinting */ 13845e576b1SMartin Schwidefsky cmma_init(); 13945e576b1SMartin Schwidefsky 1401da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1411da177e4SLinus Torvalds totalram_pages += free_all_bootmem(); 142238ec4efSMartin Schwidefsky totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds reservedpages = 0; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds codesize = (unsigned long) &_etext - (unsigned long) &_text; 1471da177e4SLinus Torvalds datasize = (unsigned long) &_edata - (unsigned long) &_etext; 1481da177e4SLinus Torvalds initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 1491da177e4SLinus Torvalds printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 150cc013a88SGeert Uytterhoeven nr_free_pages() << (PAGE_SHIFT-10), 1511da177e4SLinus Torvalds max_mapnr << (PAGE_SHIFT-10), 1521da177e4SLinus Torvalds codesize >> 10, 1531da177e4SLinus Torvalds reservedpages << (PAGE_SHIFT-10), 1541da177e4SLinus Torvalds datasize >>10, 1551da177e4SLinus Torvalds initsize >> 10); 156d882b172SHeiko Carstens printk("Write protected kernel read-only data: %#lx - %#lx\n", 157162e006eSHeiko Carstens (unsigned long)&_stext, 158162e006eSHeiko Carstens PFN_ALIGN((unsigned long)&_eshared) - 1); 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 161d96221abSHeiko Carstens void free_init_pages(char *what, unsigned long begin, unsigned long end) 1621da177e4SLinus Torvalds { 163d96221abSHeiko Carstens unsigned long addr = begin; 1641da177e4SLinus Torvalds 165d96221abSHeiko Carstens if (begin >= end) 166d96221abSHeiko Carstens return; 167d96221abSHeiko Carstens for (; addr < end; addr += PAGE_SIZE) { 1681da177e4SLinus Torvalds ClearPageReserved(virt_to_page(addr)); 1697835e98bSNick Piggin init_page_count(virt_to_page(addr)); 170d96221abSHeiko Carstens memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM, 171d96221abSHeiko Carstens PAGE_SIZE); 1721da177e4SLinus Torvalds free_page(addr); 1731da177e4SLinus Torvalds totalram_pages++; 1741da177e4SLinus Torvalds } 175d96221abSHeiko Carstens printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); 176d96221abSHeiko Carstens } 177d96221abSHeiko Carstens 178d96221abSHeiko Carstens void free_initmem(void) 179d96221abSHeiko Carstens { 180d96221abSHeiko Carstens free_init_pages("unused kernel memory", 181d96221abSHeiko Carstens (unsigned long)&__init_begin, 182d96221abSHeiko Carstens (unsigned long)&__init_end); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1865e249d6eSHeiko Carstens void __init free_initrd_mem(unsigned long start, unsigned long end) 1871da177e4SLinus Torvalds { 188d96221abSHeiko Carstens free_init_pages("initrd memory", start, end); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds #endif 191421c175cSHeiko Carstens 192421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 193421c175cSHeiko Carstens int arch_add_memory(int nid, u64 start, u64 size) 194421c175cSHeiko Carstens { 195892365abSGerald Schaefer unsigned long zone_start_pfn, zone_end_pfn, nr_pages; 196892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 197892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 198421c175cSHeiko Carstens struct zone *zone; 199421c175cSHeiko Carstens int rc; 200421c175cSHeiko Carstens 201421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 202421c175cSHeiko Carstens if (rc) 203421c175cSHeiko Carstens return rc; 204892365abSGerald Schaefer for_each_zone(zone) { 205892365abSGerald Schaefer if (zone_idx(zone) != ZONE_MOVABLE) { 206892365abSGerald Schaefer /* Add range within existing zone limits */ 207892365abSGerald Schaefer zone_start_pfn = zone->zone_start_pfn; 208892365abSGerald Schaefer zone_end_pfn = zone->zone_start_pfn + 209892365abSGerald Schaefer zone->spanned_pages; 210892365abSGerald Schaefer } else { 211892365abSGerald Schaefer /* Add remaining range to ZONE_MOVABLE */ 212892365abSGerald Schaefer zone_start_pfn = start_pfn; 213892365abSGerald Schaefer zone_end_pfn = start_pfn + size_pages; 214892365abSGerald Schaefer } 215892365abSGerald Schaefer if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) 216892365abSGerald Schaefer continue; 217892365abSGerald Schaefer nr_pages = (start_pfn + size_pages > zone_end_pfn) ? 218892365abSGerald Schaefer zone_end_pfn - start_pfn : size_pages; 219892365abSGerald Schaefer rc = __add_pages(nid, zone, start_pfn, nr_pages); 220892365abSGerald Schaefer if (rc) 221892365abSGerald Schaefer break; 222892365abSGerald Schaefer start_pfn += nr_pages; 223892365abSGerald Schaefer size_pages -= nr_pages; 224892365abSGerald Schaefer if (!size_pages) 225892365abSGerald Schaefer break; 226892365abSGerald Schaefer } 227421c175cSHeiko Carstens if (rc) 228421c175cSHeiko Carstens vmem_remove_mapping(start, size); 229421c175cSHeiko Carstens return rc; 230421c175cSHeiko Carstens } 23124d335caSWen Congyang 23224d335caSWen Congyang #ifdef CONFIG_MEMORY_HOTREMOVE 23324d335caSWen Congyang int arch_remove_memory(u64 start, u64 size) 23424d335caSWen Congyang { 23524d335caSWen Congyang /* 23624d335caSWen Congyang * There is no hardware or firmware interface which could trigger a 23724d335caSWen Congyang * hot memory remove on s390. So there is nothing that needs to be 23824d335caSWen Congyang * implemented. 23924d335caSWen Congyang */ 24024d335caSWen Congyang return -EBUSY; 24124d335caSWen Congyang } 24224d335caSWen Congyang #endif 243421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 244