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> 24e5d709bbSHeiko Carstens #include <linux/memory.h> 25d882b172SHeiko Carstens #include <linux/pfn.h> 26028d9b3cSHeiko Carstens #include <linux/poison.h> 272b67fc46SHeiko Carstens #include <linux/initrd.h> 283a4c5d59SHeiko Carstens #include <linux/export.h> 295a0e3ad6STejun Heo #include <linux/gfp.h> 30199071f1SGerald Schaefer #include <linux/memblock.h> 311da177e4SLinus Torvalds #include <asm/processor.h> 327c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 331da177e4SLinus Torvalds #include <asm/pgtable.h> 341da177e4SLinus Torvalds #include <asm/pgalloc.h> 351da177e4SLinus Torvalds #include <asm/dma.h> 361da177e4SLinus Torvalds #include <asm/lowcore.h> 371da177e4SLinus Torvalds #include <asm/tlb.h> 381da177e4SLinus Torvalds #include <asm/tlbflush.h> 39d882b172SHeiko Carstens #include <asm/sections.h> 40a0616cdeSDavid Howells #include <asm/ctl_reg.h> 41e5d709bbSHeiko Carstens #include <asm/sclp.h> 42e6c7c630SLaura Abbott #include <asm/set_memory.h> 431da177e4SLinus Torvalds 440ccb32c9SHeiko Carstens pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir); 451485c5c8SHeiko Carstens 46238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask; 471485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page); 480b70068eSArd Biesheuvel EXPORT_SYMBOL(zero_page_mask); 491da177e4SLinus Torvalds 500999f119SJiang Liu static void __init setup_zero_pages(void) 51238ec4efSMartin Schwidefsky { 52238ec4efSMartin Schwidefsky unsigned int order; 53238ec4efSMartin Schwidefsky struct page *page; 54238ec4efSMartin Schwidefsky int i; 55238ec4efSMartin Schwidefsky 56c7e8b2c2SMartin Schwidefsky /* Latest machines require a mapping granularity of 512KB */ 571f6b83e5SMartin Schwidefsky order = 7; 58c7e8b2c2SMartin Schwidefsky 597919e91bSMartin Schwidefsky /* Limit number of empty zero pages for small memory sizes */ 601f6b83e5SMartin Schwidefsky while (order > 2 && (totalram_pages >> 10) < (1UL << order)) 611f6b83e5SMartin Schwidefsky order--; 62238ec4efSMartin Schwidefsky 63238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 64238ec4efSMartin Schwidefsky if (!empty_zero_page) 65238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages"); 66238ec4efSMartin Schwidefsky 67238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page); 68238ec4efSMartin Schwidefsky split_page(page, order); 69238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) { 700999f119SJiang Liu mark_page_reserved(page); 71238ec4efSMartin Schwidefsky page++; 72238ec4efSMartin Schwidefsky } 73238ec4efSMartin Schwidefsky 740999f119SJiang Liu zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; 75238ec4efSMartin Schwidefsky } 76238ec4efSMartin Schwidefsky 771da177e4SLinus Torvalds /* 781da177e4SLinus Torvalds * paging_init() sets up the page tables 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds void __init paging_init(void) 811da177e4SLinus Torvalds { 8239b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 8314045ebfSMartin Schwidefsky unsigned long pgd_type, asce_bits; 8460c49701SHeiko Carstens psw_t psw; 851da177e4SLinus Torvalds 863610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 8714045ebfSMartin Schwidefsky if (VMALLOC_END > (1UL << 42)) { 8814045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; 8914045ebfSMartin Schwidefsky pgd_type = _REGION2_ENTRY_EMPTY; 9014045ebfSMartin Schwidefsky } else { 9114045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 926252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 9314045ebfSMartin Schwidefsky } 94723cacbdSGerald Schaefer init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 95723cacbdSGerald Schaefer S390_lowcore.kernel_asce = init_mm.context.asce; 963610cce8SMartin Schwidefsky clear_table((unsigned long *) init_mm.pgd, pgd_type, 973610cce8SMartin Schwidefsky sizeof(unsigned long)*2048); 98f4eb07c1SHeiko Carstens vmem_map_init(); 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 1013610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1023610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1033610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 10460c49701SHeiko Carstens psw.mask = __extract_psw(); 105a7525982SHeiko Carstens psw_bits(psw).dat = 1; 1068bb3fdd6SHeiko Carstens psw_bits(psw).as = PSW_BITS_AS_HOME; 10760c49701SHeiko Carstens __load_psw_mask(psw.mask); 1081da177e4SLinus Torvalds 10917f34580SHeiko Carstens sparse_memory_present_with_active_regions(MAX_NUMNODES); 11017f34580SHeiko Carstens sparse_init(); 11139b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 11239b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 11339b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 11439b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 11791d37211SHeiko Carstens void mark_rodata_ro(void) 11891d37211SHeiko Carstens { 119d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init; 120d07a980cSHeiko Carstens 121d07a980cSHeiko Carstens set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); 122d07a980cSHeiko Carstens pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); 12391d37211SHeiko Carstens } 12491d37211SHeiko Carstens 1251da177e4SLinus Torvalds void __init mem_init(void) 1261da177e4SLinus Torvalds { 1271b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); 1281b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm)); 1291b948d6cSMartin Schwidefsky 1303a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn); 1311da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1321da177e4SLinus Torvalds 13345e576b1SMartin Schwidefsky /* Setup guest page hinting */ 13445e576b1SMartin Schwidefsky cmma_init(); 13545e576b1SMartin Schwidefsky 1361da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1370c988534SJiang Liu free_all_bootmem(); 1380999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */ 1391da177e4SLinus Torvalds 140a18d0e2dSJiang Liu mem_init_print_info(NULL); 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 143d96221abSHeiko Carstens void free_initmem(void) 144d96221abSHeiko Carstens { 14557d7f939SMartin Schwidefsky __set_memory((unsigned long) _sinittext, 14657d7f939SMartin Schwidefsky (_einittext - _sinittext) >> PAGE_SHIFT, 14757d7f939SMartin Schwidefsky SET_MEMORY_RW | SET_MEMORY_NX); 148dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM); 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1525e249d6eSHeiko Carstens void __init free_initrd_mem(unsigned long start, unsigned long end) 1531da177e4SLinus Torvalds { 15411199692SJiang Liu free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 15511199692SJiang Liu "initrd"); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds #endif 158421c175cSHeiko Carstens 159604ddad0SHeiko Carstens unsigned long memory_block_size_bytes(void) 160604ddad0SHeiko Carstens { 161604ddad0SHeiko Carstens /* 162604ddad0SHeiko Carstens * Make sure the memory block size is always greater 163604ddad0SHeiko Carstens * or equal than the memory increment size. 164604ddad0SHeiko Carstens */ 165604ddad0SHeiko Carstens return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); 166604ddad0SHeiko Carstens } 167604ddad0SHeiko Carstens 168421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 169033fbae9SDan Williams int arch_add_memory(int nid, u64 start, u64 size, bool for_device) 170421c175cSHeiko Carstens { 171892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 172892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 173f1dd2cd1SMichal Hocko int rc; 174421c175cSHeiko Carstens 175421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 176421c175cSHeiko Carstens if (rc) 177421c175cSHeiko Carstens return rc; 178199071f1SGerald Schaefer 179f1dd2cd1SMichal Hocko rc = __add_pages(nid, start_pfn, size_pages, !for_device); 180421c175cSHeiko Carstens if (rc) 181421c175cSHeiko Carstens vmem_remove_mapping(start, size); 182421c175cSHeiko Carstens return rc; 183421c175cSHeiko Carstens } 18424d335caSWen Congyang 18524d335caSWen Congyang #ifdef CONFIG_MEMORY_HOTREMOVE 18624d335caSWen Congyang int arch_remove_memory(u64 start, u64 size) 18724d335caSWen Congyang { 18824d335caSWen Congyang /* 18924d335caSWen Congyang * There is no hardware or firmware interface which could trigger a 19024d335caSWen Congyang * hot memory remove on s390. So there is nothing that needs to be 19124d335caSWen Congyang * implemented. 19224d335caSWen Congyang */ 19324d335caSWen Congyang return -EBUSY; 19424d335caSWen Congyang } 19524d335caSWen Congyang #endif 196421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 197