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 430ccb32c9SHeiko Carstens pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir); 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 } 92723cacbdSGerald Schaefer init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 93723cacbdSGerald Schaefer S390_lowcore.kernel_asce = init_mm.context.asce; 943610cce8SMartin Schwidefsky clear_table((unsigned long *) init_mm.pgd, pgd_type, 953610cce8SMartin Schwidefsky sizeof(unsigned long)*2048); 96f4eb07c1SHeiko Carstens vmem_map_init(); 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 993610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1003610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1013610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 102204ee2c5SChristian Borntraeger __arch_local_irq_stosm(0x04); 1031da177e4SLinus Torvalds 10417f34580SHeiko Carstens sparse_memory_present_with_active_regions(MAX_NUMNODES); 10517f34580SHeiko Carstens sparse_init(); 10639b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 10739b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 10839b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 10939b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 11291d37211SHeiko Carstens void mark_rodata_ro(void) 11391d37211SHeiko Carstens { 114d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init; 115d07a980cSHeiko Carstens 116d07a980cSHeiko Carstens set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); 117d07a980cSHeiko Carstens pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); 11891d37211SHeiko Carstens } 11991d37211SHeiko Carstens 1201da177e4SLinus Torvalds void __init mem_init(void) 1211da177e4SLinus Torvalds { 1221b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); 1231b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm)); 1241b948d6cSMartin Schwidefsky 1253a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn); 1261da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1271da177e4SLinus Torvalds 12845e576b1SMartin Schwidefsky /* Setup guest page hinting */ 12945e576b1SMartin Schwidefsky cmma_init(); 13045e576b1SMartin Schwidefsky 1311da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1320c988534SJiang Liu free_all_bootmem(); 1330999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */ 1341da177e4SLinus Torvalds 135a18d0e2dSJiang Liu mem_init_print_info(NULL); 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 138d96221abSHeiko Carstens void free_initmem(void) 139d96221abSHeiko Carstens { 140dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM); 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1445e249d6eSHeiko Carstens void __init free_initrd_mem(unsigned long start, unsigned long end) 1451da177e4SLinus Torvalds { 14611199692SJiang Liu free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 14711199692SJiang Liu "initrd"); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds #endif 150421c175cSHeiko Carstens 151421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 152033fbae9SDan Williams int arch_add_memory(int nid, u64 start, u64 size, bool for_device) 153421c175cSHeiko Carstens { 1544a654294SGerald Schaefer unsigned long zone_start_pfn, zone_end_pfn, nr_pages; 155892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 156892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 1574a654294SGerald Schaefer pg_data_t *pgdat = NODE_DATA(nid); 1584a654294SGerald Schaefer struct zone *zone; 1594a654294SGerald Schaefer int rc, i; 160421c175cSHeiko Carstens 161421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 162421c175cSHeiko Carstens if (rc) 163421c175cSHeiko Carstens return rc; 164199071f1SGerald Schaefer 1654a654294SGerald Schaefer for (i = 0; i < MAX_NR_ZONES; i++) { 1664a654294SGerald Schaefer zone = pgdat->node_zones + i; 1674a654294SGerald Schaefer if (zone_idx(zone) != ZONE_MOVABLE) { 1684a654294SGerald Schaefer /* Add range within existing zone limits, if possible */ 1694a654294SGerald Schaefer zone_start_pfn = zone->zone_start_pfn; 1704a654294SGerald Schaefer zone_end_pfn = zone->zone_start_pfn + 1714a654294SGerald Schaefer zone->spanned_pages; 172892365abSGerald Schaefer } else { 1734a654294SGerald Schaefer /* Add remaining range to ZONE_MOVABLE */ 1744a654294SGerald Schaefer zone_start_pfn = start_pfn; 1754a654294SGerald Schaefer zone_end_pfn = start_pfn + size_pages; 176892365abSGerald Schaefer } 1774a654294SGerald Schaefer if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn) 1784a654294SGerald Schaefer continue; 1794a654294SGerald Schaefer nr_pages = (start_pfn + size_pages > zone_end_pfn) ? 1804a654294SGerald Schaefer zone_end_pfn - start_pfn : size_pages; 1814a654294SGerald Schaefer rc = __add_pages(nid, zone, start_pfn, nr_pages); 182892365abSGerald Schaefer if (rc) 183892365abSGerald Schaefer break; 184892365abSGerald Schaefer start_pfn += nr_pages; 185892365abSGerald Schaefer size_pages -= nr_pages; 1864a654294SGerald Schaefer if (!size_pages) 1874a654294SGerald Schaefer break; 188892365abSGerald Schaefer } 189421c175cSHeiko Carstens if (rc) 190421c175cSHeiko Carstens vmem_remove_mapping(start, size); 191421c175cSHeiko Carstens return rc; 192421c175cSHeiko Carstens } 19324d335caSWen Congyang 194e5d709bbSHeiko Carstens unsigned long memory_block_size_bytes(void) 195e5d709bbSHeiko Carstens { 196e5d709bbSHeiko Carstens /* 197e5d709bbSHeiko Carstens * Make sure the memory block size is always greater 198e5d709bbSHeiko Carstens * or equal than the memory increment size. 199e5d709bbSHeiko Carstens */ 20037c5f6c8SDavid Hildenbrand return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); 201e5d709bbSHeiko Carstens } 202e5d709bbSHeiko Carstens 20324d335caSWen Congyang #ifdef CONFIG_MEMORY_HOTREMOVE 20424d335caSWen Congyang int arch_remove_memory(u64 start, u64 size) 20524d335caSWen Congyang { 20624d335caSWen Congyang /* 20724d335caSWen Congyang * There is no hardware or firmware interface which could trigger a 20824d335caSWen Congyang * hot memory remove on s390. So there is nothing that needs to be 20924d335caSWen Congyang * implemented. 21024d335caSWen Congyang */ 21124d335caSWen Congyang return -EBUSY; 21224d335caSWen Congyang } 21324d335caSWen Congyang #endif 214421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 215