/* * 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); EXPORT_SYMBOL(zero_page_mask); 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)); 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) { if (MACHINE_HAS_TLB_LC) cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); cpumask_set_cpu(0, mm_cpumask(&init_mm)); atomic_set(&init_mm.context.attach_count, 1); 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 */