| /* |
| * 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)); |
| |
| atomic_set(&init_mm.context.attach_count, 1); |
| |
| 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) |
| { |
| 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 */ |