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> 321da177e4SLinus Torvalds #include <asm/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> 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 441485c5c8SHeiko Carstens 45238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask; 461485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page); 470b70068eSArd Biesheuvel EXPORT_SYMBOL(zero_page_mask); 481da177e4SLinus Torvalds 490999f119SJiang Liu static void __init setup_zero_pages(void) 50238ec4efSMartin Schwidefsky { 51238ec4efSMartin Schwidefsky unsigned int order; 52238ec4efSMartin Schwidefsky struct page *page; 53238ec4efSMartin Schwidefsky int i; 54238ec4efSMartin Schwidefsky 55c7e8b2c2SMartin Schwidefsky /* Latest machines require a mapping granularity of 512KB */ 561f6b83e5SMartin Schwidefsky order = 7; 57c7e8b2c2SMartin Schwidefsky 587919e91bSMartin Schwidefsky /* Limit number of empty zero pages for small memory sizes */ 591f6b83e5SMartin Schwidefsky while (order > 2 && (totalram_pages >> 10) < (1UL << order)) 601f6b83e5SMartin Schwidefsky order--; 61238ec4efSMartin Schwidefsky 62238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 63238ec4efSMartin Schwidefsky if (!empty_zero_page) 64238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages"); 65238ec4efSMartin Schwidefsky 66238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page); 67238ec4efSMartin Schwidefsky split_page(page, order); 68238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) { 690999f119SJiang Liu mark_page_reserved(page); 70238ec4efSMartin Schwidefsky page++; 71238ec4efSMartin Schwidefsky } 72238ec4efSMartin Schwidefsky 730999f119SJiang Liu zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; 74238ec4efSMartin Schwidefsky } 75238ec4efSMartin Schwidefsky 761da177e4SLinus Torvalds /* 771da177e4SLinus Torvalds * paging_init() sets up the page tables 781da177e4SLinus Torvalds */ 791da177e4SLinus Torvalds void __init paging_init(void) 801da177e4SLinus Torvalds { 8139b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 8214045ebfSMartin Schwidefsky unsigned long pgd_type, asce_bits; 831da177e4SLinus Torvalds 843610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 8514045ebfSMartin Schwidefsky if (VMALLOC_END > (1UL << 42)) { 8614045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; 8714045ebfSMartin Schwidefsky pgd_type = _REGION2_ENTRY_EMPTY; 8814045ebfSMartin Schwidefsky } else { 8914045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 906252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 9114045ebfSMartin Schwidefsky } 9214045ebfSMartin Schwidefsky S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 933610cce8SMartin Schwidefsky clear_table((unsigned long *) init_mm.pgd, pgd_type, 943610cce8SMartin Schwidefsky sizeof(unsigned long)*2048); 95f4eb07c1SHeiko Carstens vmem_map_init(); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 983610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 993610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1003610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 101204ee2c5SChristian Borntraeger __arch_local_irq_stosm(0x04); 1021da177e4SLinus Torvalds 10317f34580SHeiko Carstens sparse_memory_present_with_active_regions(MAX_NUMNODES); 10417f34580SHeiko Carstens sparse_init(); 10539b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 10639b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 10739b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 10839b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds void __init mem_init(void) 1121da177e4SLinus Torvalds { 1131b948d6cSMartin Schwidefsky if (MACHINE_HAS_TLB_LC) 1141b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); 1151b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm)); 1161b948d6cSMartin Schwidefsky atomic_set(&init_mm.context.attach_count, 1); 1171b948d6cSMartin Schwidefsky 1183a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn); 1191da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1201da177e4SLinus Torvalds 12145e576b1SMartin Schwidefsky /* Setup guest page hinting */ 12245e576b1SMartin Schwidefsky cmma_init(); 12345e576b1SMartin Schwidefsky 1241da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1250c988534SJiang Liu free_all_bootmem(); 1260999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */ 1271da177e4SLinus Torvalds 128a18d0e2dSJiang Liu mem_init_print_info(NULL); 129d882b172SHeiko Carstens printk("Write protected kernel read-only data: %#lx - %#lx\n", 130162e006eSHeiko Carstens (unsigned long)&_stext, 131162e006eSHeiko Carstens PFN_ALIGN((unsigned long)&_eshared) - 1); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 134d96221abSHeiko Carstens void free_initmem(void) 135d96221abSHeiko Carstens { 136dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1405e249d6eSHeiko Carstens void __init free_initrd_mem(unsigned long start, unsigned long end) 1411da177e4SLinus Torvalds { 14211199692SJiang Liu free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 14311199692SJiang Liu "initrd"); 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds #endif 146421c175cSHeiko Carstens 147421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 148033fbae9SDan Williams int arch_add_memory(int nid, u64 start, u64 size, bool for_device) 149421c175cSHeiko Carstens { 150199071f1SGerald Schaefer unsigned long normal_end_pfn = PFN_DOWN(memblock_end_of_DRAM()); 151199071f1SGerald Schaefer unsigned long dma_end_pfn = PFN_DOWN(MAX_DMA_ADDRESS); 152892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 153892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 154199071f1SGerald Schaefer unsigned long nr_pages; 155199071f1SGerald Schaefer int rc, zone_enum; 156421c175cSHeiko Carstens 157421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 158421c175cSHeiko Carstens if (rc) 159421c175cSHeiko Carstens return rc; 160199071f1SGerald Schaefer 161199071f1SGerald Schaefer while (size_pages > 0) { 162199071f1SGerald Schaefer if (start_pfn < dma_end_pfn) { 163199071f1SGerald Schaefer nr_pages = (start_pfn + size_pages > dma_end_pfn) ? 164199071f1SGerald Schaefer dma_end_pfn - start_pfn : size_pages; 165199071f1SGerald Schaefer zone_enum = ZONE_DMA; 166199071f1SGerald Schaefer } else if (start_pfn < normal_end_pfn) { 167199071f1SGerald Schaefer nr_pages = (start_pfn + size_pages > normal_end_pfn) ? 168199071f1SGerald Schaefer normal_end_pfn - start_pfn : size_pages; 169199071f1SGerald Schaefer zone_enum = ZONE_NORMAL; 170892365abSGerald Schaefer } else { 171199071f1SGerald Schaefer nr_pages = size_pages; 172199071f1SGerald Schaefer zone_enum = ZONE_MOVABLE; 173892365abSGerald Schaefer } 174199071f1SGerald Schaefer rc = __add_pages(nid, NODE_DATA(nid)->node_zones + zone_enum, 175199071f1SGerald Schaefer start_pfn, size_pages); 176892365abSGerald Schaefer if (rc) 177892365abSGerald Schaefer break; 178892365abSGerald Schaefer start_pfn += nr_pages; 179892365abSGerald Schaefer size_pages -= nr_pages; 180892365abSGerald Schaefer } 181421c175cSHeiko Carstens if (rc) 182421c175cSHeiko Carstens vmem_remove_mapping(start, size); 183421c175cSHeiko Carstens return rc; 184421c175cSHeiko Carstens } 18524d335caSWen Congyang 186e5d709bbSHeiko Carstens unsigned long memory_block_size_bytes(void) 187e5d709bbSHeiko Carstens { 188e5d709bbSHeiko Carstens /* 189e5d709bbSHeiko Carstens * Make sure the memory block size is always greater 190e5d709bbSHeiko Carstens * or equal than the memory increment size. 191e5d709bbSHeiko Carstens */ 19237c5f6c8SDavid Hildenbrand return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); 193e5d709bbSHeiko Carstens } 194e5d709bbSHeiko Carstens 19524d335caSWen Congyang #ifdef CONFIG_MEMORY_HOTREMOVE 19624d335caSWen Congyang int arch_remove_memory(u64 start, u64 size) 19724d335caSWen Congyang { 19824d335caSWen Congyang /* 19924d335caSWen Congyang * There is no hardware or firmware interface which could trigger a 20024d335caSWen Congyang * hot memory remove on s390. So there is nothing that needs to be 20124d335caSWen Congyang * implemented. 20224d335caSWen Congyang */ 20324d335caSWen Congyang return -EBUSY; 20424d335caSWen Congyang } 20524d335caSWen Congyang #endif 206421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 207