| /* |
| * arch/s390/mm/init.c |
| * |
| * S390 version |
| * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| * 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/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> |
| |
| 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); |
| |
| static unsigned long setup_zero_pages(void) |
| { |
| struct cpuid cpu_id; |
| unsigned int order; |
| unsigned long size; |
| 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 */ |
| default: |
| order = 2; |
| break; |
| } |
| |
| 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--) { |
| SetPageReserved(page); |
| page++; |
| } |
| |
| size = PAGE_SIZE << order; |
| zero_page_mask = (size - 1) & PAGE_MASK; |
| |
| return 1UL << order; |
| } |
| |
| /* |
| * 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); |
| fault_init(); |
| } |
| |
| void __init mem_init(void) |
| { |
| unsigned long codesize, reservedpages, datasize, initsize; |
| |
| max_mapnr = num_physpages = 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 */ |
| totalram_pages += free_all_bootmem(); |
| totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ |
| |
| reservedpages = 0; |
| |
| codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
| nr_free_pages() << (PAGE_SHIFT-10), |
| max_mapnr << (PAGE_SHIFT-10), |
| codesize >> 10, |
| reservedpages << (PAGE_SHIFT-10), |
| datasize >>10, |
| initsize >> 10); |
| printk("Write protected kernel read-only data: %#lx - %#lx\n", |
| (unsigned long)&_stext, |
| PFN_ALIGN((unsigned long)&_eshared) - 1); |
| } |
| |
| #ifdef CONFIG_DEBUG_PAGEALLOC |
| void kernel_map_pages(struct page *page, int numpages, int enable) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| pte_t *pte; |
| unsigned long address; |
| int i; |
| |
| for (i = 0; i < numpages; i++) { |
| address = page_to_phys(page + i); |
| pgd = pgd_offset_k(address); |
| pud = pud_offset(pgd, address); |
| pmd = pmd_offset(pud, address); |
| pte = pte_offset_kernel(pmd, address); |
| if (!enable) { |
| __ptep_ipte(address, pte); |
| pte_val(*pte) = _PAGE_TYPE_EMPTY; |
| continue; |
| } |
| *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW)); |
| /* Flush cpu write queue. */ |
| mb(); |
| } |
| } |
| #endif |
| |
| void free_init_pages(char *what, unsigned long begin, unsigned long end) |
| { |
| unsigned long addr = begin; |
| |
| if (begin >= end) |
| return; |
| for (; addr < end; addr += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(addr)); |
| init_page_count(virt_to_page(addr)); |
| memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM, |
| PAGE_SIZE); |
| free_page(addr); |
| totalram_pages++; |
| } |
| printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
| } |
| |
| void free_initmem(void) |
| { |
| free_init_pages("unused kernel memory", |
| (unsigned long)&__init_begin, |
| (unsigned long)&__init_end); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| free_init_pages("initrd memory", start, end); |
| } |
| #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; |
| } |
| #endif /* CONFIG_MEMORY_HOTPLUG */ |