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 diag10(unsigned long addr) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds if (addr >= 0x7ff00000) 481da177e4SLinus Torvalds return; 491da177e4SLinus Torvalds asm volatile( 5094c12cc7SMartin Schwidefsky #ifdef CONFIG_64BIT 511da177e4SLinus Torvalds " sam31\n" 521da177e4SLinus Torvalds " diag %0,%0,0x10\n" 531da177e4SLinus Torvalds "0: sam64\n" 541da177e4SLinus Torvalds #else 551da177e4SLinus Torvalds " diag %0,%0,0x10\n" 561da177e4SLinus Torvalds "0:\n" 571da177e4SLinus Torvalds #endif 5894c12cc7SMartin Schwidefsky EX_TABLE(0b,0b) 5994c12cc7SMartin Schwidefsky : : "a" (addr)); 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds void show_mem(void) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds int i, total = 0, reserved = 0; 651da177e4SLinus Torvalds int shared = 0, cached = 0; 660b2b6e1dSHeiko Carstens struct page *page; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds printk("Mem-info:\n"); 691da177e4SLinus Torvalds show_free_areas(); 701da177e4SLinus Torvalds printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 711da177e4SLinus Torvalds i = max_mapnr; 721da177e4SLinus Torvalds while (i-- > 0) { 73f4eb07c1SHeiko Carstens if (!pfn_valid(i)) 74f4eb07c1SHeiko Carstens continue; 750b2b6e1dSHeiko Carstens page = pfn_to_page(i); 761da177e4SLinus Torvalds total++; 770b2b6e1dSHeiko Carstens if (PageReserved(page)) 781da177e4SLinus Torvalds reserved++; 790b2b6e1dSHeiko Carstens else if (PageSwapCache(page)) 801da177e4SLinus Torvalds cached++; 810b2b6e1dSHeiko Carstens else if (page_count(page)) 820b2b6e1dSHeiko Carstens shared += page_count(page) - 1; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds printk("%d pages of RAM\n",total); 851da177e4SLinus Torvalds printk("%d reserved pages\n",reserved); 861da177e4SLinus Torvalds printk("%d pages shared\n",shared); 871da177e4SLinus Torvalds printk("%d pages swap cached\n",cached); 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds 90f4eb07c1SHeiko Carstens static void __init setup_ro_region(void) 91f4eb07c1SHeiko Carstens { 92f4eb07c1SHeiko Carstens pgd_t *pgd; 93f4eb07c1SHeiko Carstens pmd_t *pmd; 94f4eb07c1SHeiko Carstens pte_t *pte; 95f4eb07c1SHeiko Carstens pte_t new_pte; 96f4eb07c1SHeiko Carstens unsigned long address, end; 97f4eb07c1SHeiko Carstens 98162e006eSHeiko Carstens address = ((unsigned long)&_stext) & PAGE_MASK; 99162e006eSHeiko Carstens end = PFN_ALIGN((unsigned long)&_eshared); 100f4eb07c1SHeiko Carstens 101f4eb07c1SHeiko Carstens for (; address < end; address += PAGE_SIZE) { 102f4eb07c1SHeiko Carstens pgd = pgd_offset_k(address); 103f4eb07c1SHeiko Carstens pmd = pmd_offset(pgd, address); 104f4eb07c1SHeiko Carstens pte = pte_offset_kernel(pmd, address); 105f4eb07c1SHeiko Carstens new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); 106c1821c2eSGerald Schaefer *pte = new_pte; 107f4eb07c1SHeiko Carstens } 108f4eb07c1SHeiko Carstens } 109f4eb07c1SHeiko Carstens 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * paging_init() sets up the page tables 1121da177e4SLinus Torvalds */ 1131da177e4SLinus Torvalds void __init paging_init(void) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds pgd_t *pg_dir; 1161da177e4SLinus Torvalds int i; 117f4eb07c1SHeiko Carstens unsigned long pgdir_k; 1181da177e4SLinus Torvalds static const int ssm_mask = 0x04000000L; 11939b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds pg_dir = swapper_pg_dir; 1221da177e4SLinus Torvalds 123f4eb07c1SHeiko Carstens #ifdef CONFIG_64BIT 124f4eb07c1SHeiko Carstens pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; 1259282ed92SGerald Schaefer for (i = 0; i < PTRS_PER_PGD; i++) 126c1821c2eSGerald Schaefer pgd_clear_kernel(pg_dir + i); 127f4eb07c1SHeiko Carstens #else 128f4eb07c1SHeiko Carstens pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; 129f4eb07c1SHeiko Carstens for (i = 0; i < PTRS_PER_PGD; i++) 130c1821c2eSGerald Schaefer pmd_clear_kernel((pmd_t *)(pg_dir + i)); 131f4eb07c1SHeiko Carstens #endif 132f4eb07c1SHeiko Carstens vmem_map_init(); 133f4eb07c1SHeiko Carstens setup_ro_region(); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds S390_lowcore.kernel_asce = pgdir_k; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 13894c12cc7SMartin Schwidefsky __ctl_load(pgdir_k, 1, 1); 13994c12cc7SMartin Schwidefsky __ctl_load(pgdir_k, 7, 7); 14094c12cc7SMartin Schwidefsky __ctl_load(pgdir_k, 13, 13); 14194c12cc7SMartin Schwidefsky __raw_local_irq_ssm(ssm_mask); 1421da177e4SLinus Torvalds 14339b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 144118bcd31SHeiko Carstens #ifdef CONFIG_ZONE_DMA 14539b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 146118bcd31SHeiko Carstens #endif 14739b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 14839b742f9SHeiko Carstens free_area_init_nodes(max_zone_pfns); 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds void __init mem_init(void) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds unsigned long codesize, reservedpages, datasize, initsize; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds max_mapnr = num_physpages = max_low_pfn; 1561da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* clear the zero-page */ 1591da177e4SLinus Torvalds memset(empty_zero_page, 0, PAGE_SIZE); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 1621da177e4SLinus Torvalds totalram_pages += free_all_bootmem(); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds reservedpages = 0; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds codesize = (unsigned long) &_etext - (unsigned long) &_text; 1671da177e4SLinus Torvalds datasize = (unsigned long) &_edata - (unsigned long) &_etext; 1681da177e4SLinus Torvalds initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 1691da177e4SLinus Torvalds printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 1701da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 1711da177e4SLinus Torvalds max_mapnr << (PAGE_SHIFT-10), 1721da177e4SLinus Torvalds codesize >> 10, 1731da177e4SLinus Torvalds reservedpages << (PAGE_SHIFT-10), 1741da177e4SLinus Torvalds datasize >>10, 1751da177e4SLinus Torvalds initsize >> 10); 176d882b172SHeiko Carstens printk("Write protected kernel read-only data: %#lx - %#lx\n", 177162e006eSHeiko Carstens (unsigned long)&_stext, 178162e006eSHeiko Carstens PFN_ALIGN((unsigned long)&_eshared) - 1); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds void free_initmem(void) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds unsigned long addr; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds addr = (unsigned long)(&__init_begin); 1861da177e4SLinus Torvalds for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 1871da177e4SLinus Torvalds ClearPageReserved(virt_to_page(addr)); 1887835e98bSNick Piggin init_page_count(virt_to_page(addr)); 189028d9b3cSHeiko Carstens memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); 1901da177e4SLinus Torvalds free_page(addr); 1911da177e4SLinus Torvalds totalram_pages++; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds printk ("Freeing unused kernel memory: %ldk freed\n", 1941da177e4SLinus Torvalds ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 1981da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds if (start < end) 2011da177e4SLinus Torvalds printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 2021da177e4SLinus Torvalds for (; start < end; start += PAGE_SIZE) { 2031da177e4SLinus Torvalds ClearPageReserved(virt_to_page(start)); 2047835e98bSNick Piggin init_page_count(virt_to_page(start)); 2051da177e4SLinus Torvalds free_page(start); 2061da177e4SLinus Torvalds totalram_pages++; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds #endif 210