11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * arch/s390/mm/init.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * S390 version 51da177e4SLinus Torvalds * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 61da177e4SLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com) 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Derived from "arch/i386/mm/init.c" 91da177e4SLinus Torvalds * Copyright (C) 1995 Linus Torvalds 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/signal.h> 131da177e4SLinus Torvalds #include <linux/sched.h> 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/errno.h> 161da177e4SLinus Torvalds #include <linux/string.h> 171da177e4SLinus Torvalds #include <linux/types.h> 181da177e4SLinus Torvalds #include <linux/ptrace.h> 191da177e4SLinus Torvalds #include <linux/mman.h> 201da177e4SLinus Torvalds #include <linux/mm.h> 211da177e4SLinus Torvalds #include <linux/swap.h> 221da177e4SLinus Torvalds #include <linux/smp.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/pagemap.h> 251da177e4SLinus Torvalds #include <linux/bootmem.h> 26d882b172SHeiko Carstens #include <linux/pfn.h> 27028d9b3cSHeiko Carstens #include <linux/poison.h> 282b67fc46SHeiko Carstens #include <linux/initrd.h> 291da177e4SLinus Torvalds #include <asm/processor.h> 301da177e4SLinus Torvalds #include <asm/system.h> 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/pgtable.h> 331da177e4SLinus Torvalds #include <asm/pgalloc.h> 341da177e4SLinus Torvalds #include <asm/dma.h> 351da177e4SLinus Torvalds #include <asm/lowcore.h> 361da177e4SLinus Torvalds #include <asm/tlb.h> 371da177e4SLinus Torvalds #include <asm/tlbflush.h> 38d882b172SHeiko Carstens #include <asm/sections.h> 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 431da177e4SLinus Torvalds char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds void show_mem(void) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds int i, total = 0, reserved = 0; 481da177e4SLinus Torvalds int shared = 0, cached = 0; 490b2b6e1dSHeiko Carstens struct page *page; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds printk("Mem-info:\n"); 521da177e4SLinus Torvalds show_free_areas(); 531da177e4SLinus Torvalds printk("Free swap: %6ldkB\n", nr_swap_pages << (PAGE_SHIFT - 10)); 541da177e4SLinus Torvalds i = max_mapnr; 551da177e4SLinus Torvalds while (i-- > 0) { 56f4eb07c1SHeiko Carstens if (!pfn_valid(i)) 57f4eb07c1SHeiko Carstens continue; 580b2b6e1dSHeiko Carstens page = pfn_to_page(i); 591da177e4SLinus Torvalds total++; 600b2b6e1dSHeiko Carstens if (PageReserved(page)) 611da177e4SLinus Torvalds reserved++; 620b2b6e1dSHeiko Carstens else if (PageSwapCache(page)) 631da177e4SLinus Torvalds cached++; 640b2b6e1dSHeiko Carstens else if (page_count(page)) 650b2b6e1dSHeiko Carstens shared += page_count(page) - 1; 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 681da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 691da177e4SLinus Torvalds printk("%d pages shared\n", shared); 701da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 71be2864b5SHeiko Carstens 72be2864b5SHeiko Carstens printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY)); 73be2864b5SHeiko Carstens printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK)); 74be2864b5SHeiko Carstens printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED)); 75be2864b5SHeiko Carstens printk("%lu pages slab\n", 76be2864b5SHeiko Carstens global_page_state(NR_SLAB_RECLAIMABLE) + 77be2864b5SHeiko Carstens global_page_state(NR_SLAB_UNRECLAIMABLE)); 78be2864b5SHeiko Carstens printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE)); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 81f4eb07c1SHeiko Carstens static void __init setup_ro_region(void) 82f4eb07c1SHeiko Carstens { 83f4eb07c1SHeiko Carstens pgd_t *pgd; 84190a1d72SMartin Schwidefsky pud_t *pud; 85f4eb07c1SHeiko Carstens pmd_t *pmd; 86f4eb07c1SHeiko Carstens pte_t *pte; 87f4eb07c1SHeiko Carstens pte_t new_pte; 88f4eb07c1SHeiko Carstens unsigned long address, end; 89f4eb07c1SHeiko Carstens 90162e006eSHeiko Carstens address = ((unsigned long)&_stext) & PAGE_MASK; 91162e006eSHeiko Carstens end = PFN_ALIGN((unsigned long)&_eshared); 92f4eb07c1SHeiko Carstens 93f4eb07c1SHeiko Carstens for (; address < end; address += PAGE_SIZE) { 94f4eb07c1SHeiko Carstens pgd = pgd_offset_k(address); 95190a1d72SMartin Schwidefsky pud = pud_offset(pgd, address); 96190a1d72SMartin Schwidefsky pmd = pmd_offset(pud, address); 97f4eb07c1SHeiko Carstens pte = pte_offset_kernel(pmd, address); 98f4eb07c1SHeiko Carstens new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); 99c1821c2eSGerald Schaefer *pte = new_pte; 100f4eb07c1SHeiko Carstens } 101f4eb07c1SHeiko Carstens } 102f4eb07c1SHeiko Carstens 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * paging_init() sets up the page tables 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds void __init paging_init(void) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds static const int ssm_mask = 0x04000000L; 10939b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 1103610cce8SMartin Schwidefsky unsigned long pgd_type; 1111da177e4SLinus Torvalds 1123610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 1133610cce8SMartin Schwidefsky S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK; 114f4eb07c1SHeiko Carstens #ifdef CONFIG_64BIT 1156252d702SMartin Schwidefsky /* A three level page table (4TB) is enough for the kernel space. */ 1166252d702SMartin Schwidefsky S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 1176252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 118f4eb07c1SHeiko Carstens #else 1193610cce8SMartin Schwidefsky S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH; 1203610cce8SMartin Schwidefsky pgd_type = _SEGMENT_ENTRY_EMPTY; 121f4eb07c1SHeiko Carstens #endif 1223610cce8SMartin Schwidefsky clear_table((unsigned long *) init_mm.pgd, pgd_type, 1233610cce8SMartin Schwidefsky sizeof(unsigned long)*2048); 124f4eb07c1SHeiko Carstens vmem_map_init(); 125f4eb07c1SHeiko Carstens setup_ro_region(); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 1283610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1293610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 7, 7); 1303610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 13194c12cc7SMartin Schwidefsky __raw_local_irq_ssm(ssm_mask); 1321da177e4SLinus Torvalds 13339b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 134118bcd31SHeiko Carstens #ifdef CONFIG_ZONE_DMA 13539b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 136118bcd31SHeiko Carstens #endif 13739b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 13839b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds void __init mem_init(void) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds unsigned long codesize, reservedpages, datasize, initsize; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds max_mapnr = num_physpages = max_low_pfn; 1461da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds /* clear the zero-page */ 1491da177e4SLinus Torvalds memset(empty_zero_page, 0, PAGE_SIZE); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1521da177e4SLinus Torvalds totalram_pages += free_all_bootmem(); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds reservedpages = 0; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds codesize = (unsigned long) &_etext - (unsigned long) &_text; 1571da177e4SLinus Torvalds datasize = (unsigned long) &_edata - (unsigned long) &_etext; 1581da177e4SLinus Torvalds initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 1591da177e4SLinus Torvalds printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 1601da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 1611da177e4SLinus Torvalds max_mapnr << (PAGE_SHIFT-10), 1621da177e4SLinus Torvalds codesize >> 10, 1631da177e4SLinus Torvalds reservedpages << (PAGE_SHIFT-10), 1641da177e4SLinus Torvalds datasize >>10, 1651da177e4SLinus Torvalds initsize >> 10); 166d882b172SHeiko Carstens printk("Write protected kernel read-only data: %#lx - %#lx\n", 167162e006eSHeiko Carstens (unsigned long)&_stext, 168162e006eSHeiko Carstens PFN_ALIGN((unsigned long)&_eshared) - 1); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1712485579bSHeiko Carstens #ifdef CONFIG_DEBUG_PAGEALLOC 1722485579bSHeiko Carstens void kernel_map_pages(struct page *page, int numpages, int enable) 1732485579bSHeiko Carstens { 1742485579bSHeiko Carstens pgd_t *pgd; 1752485579bSHeiko Carstens pud_t *pud; 1762485579bSHeiko Carstens pmd_t *pmd; 1772485579bSHeiko Carstens pte_t *pte; 1782485579bSHeiko Carstens unsigned long address; 1792485579bSHeiko Carstens int i; 1802485579bSHeiko Carstens 1812485579bSHeiko Carstens for (i = 0; i < numpages; i++) { 1822485579bSHeiko Carstens address = page_to_phys(page + i); 1832485579bSHeiko Carstens pgd = pgd_offset_k(address); 1842485579bSHeiko Carstens pud = pud_offset(pgd, address); 1852485579bSHeiko Carstens pmd = pmd_offset(pud, address); 1862485579bSHeiko Carstens pte = pte_offset_kernel(pmd, address); 1872485579bSHeiko Carstens if (!enable) { 188146e4b3cSMartin Schwidefsky ptep_invalidate(&init_mm, address, pte); 1892485579bSHeiko Carstens continue; 1902485579bSHeiko Carstens } 1912485579bSHeiko Carstens *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW)); 1922485579bSHeiko Carstens /* Flush cpu write queue. */ 1932485579bSHeiko Carstens mb(); 1942485579bSHeiko Carstens } 1952485579bSHeiko Carstens } 1962485579bSHeiko Carstens #endif 1972485579bSHeiko Carstens 1981da177e4SLinus Torvalds void free_initmem(void) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds unsigned long addr; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds addr = (unsigned long)(&__init_begin); 2031da177e4SLinus Torvalds for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 2041da177e4SLinus Torvalds ClearPageReserved(virt_to_page(addr)); 2057835e98bSNick Piggin init_page_count(virt_to_page(addr)); 206028d9b3cSHeiko Carstens memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); 2071da177e4SLinus Torvalds free_page(addr); 2081da177e4SLinus Torvalds totalram_pages++; 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds printk ("Freeing unused kernel memory: %ldk freed\n", 2111da177e4SLinus Torvalds ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 2151da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds if (start < end) 2181da177e4SLinus Torvalds printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 2191da177e4SLinus Torvalds for (; start < end; start += PAGE_SIZE) { 2201da177e4SLinus Torvalds ClearPageReserved(virt_to_page(start)); 2217835e98bSNick Piggin init_page_count(virt_to_page(start)); 2221da177e4SLinus Torvalds free_page(start); 2231da177e4SLinus Torvalds totalram_pages++; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds #endif 227