init.c revision 39b742f957a287a7514a8a35c9f516cdf30b9ff5
1/* 2 * arch/s390/mm/init.c 3 * 4 * S390 version 5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com) 7 * 8 * Derived from "arch/i386/mm/init.c" 9 * Copyright (C) 1995 Linus Torvalds 10 */ 11 12#include <linux/signal.h> 13#include <linux/sched.h> 14#include <linux/kernel.h> 15#include <linux/errno.h> 16#include <linux/string.h> 17#include <linux/types.h> 18#include <linux/ptrace.h> 19#include <linux/mman.h> 20#include <linux/mm.h> 21#include <linux/swap.h> 22#include <linux/smp.h> 23#include <linux/init.h> 24#include <linux/pagemap.h> 25#include <linux/bootmem.h> 26#include <linux/pfn.h> 27 28#include <asm/processor.h> 29#include <asm/system.h> 30#include <asm/uaccess.h> 31#include <asm/pgtable.h> 32#include <asm/pgalloc.h> 33#include <asm/dma.h> 34#include <asm/lowcore.h> 35#include <asm/tlb.h> 36#include <asm/tlbflush.h> 37#include <asm/sections.h> 38 39DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 40 41pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 42char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 43 44void diag10(unsigned long addr) 45{ 46 if (addr >= 0x7ff00000) 47 return; 48 asm volatile( 49#ifdef CONFIG_64BIT 50 " sam31\n" 51 " diag %0,%0,0x10\n" 52 "0: sam64\n" 53#else 54 " diag %0,%0,0x10\n" 55 "0:\n" 56#endif 57 EX_TABLE(0b,0b) 58 : : "a" (addr)); 59} 60 61void show_mem(void) 62{ 63 int i, total = 0, reserved = 0; 64 int shared = 0, cached = 0; 65 struct page *page; 66 67 printk("Mem-info:\n"); 68 show_free_areas(); 69 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 70 i = max_mapnr; 71 while (i-- > 0) { 72 if (!pfn_valid(i)) 73 continue; 74 page = pfn_to_page(i); 75 total++; 76 if (PageReserved(page)) 77 reserved++; 78 else if (PageSwapCache(page)) 79 cached++; 80 else if (page_count(page)) 81 shared += page_count(page) - 1; 82 } 83 printk("%d pages of RAM\n",total); 84 printk("%d reserved pages\n",reserved); 85 printk("%d pages shared\n",shared); 86 printk("%d pages swap cached\n",cached); 87} 88 89static void __init setup_ro_region(void) 90{ 91 pgd_t *pgd; 92 pmd_t *pmd; 93 pte_t *pte; 94 pte_t new_pte; 95 unsigned long address, end; 96 97 address = ((unsigned long)&__start_rodata) & PAGE_MASK; 98 end = PFN_ALIGN((unsigned long)&__end_rodata); 99 100 for (; address < end; address += PAGE_SIZE) { 101 pgd = pgd_offset_k(address); 102 pmd = pmd_offset(pgd, address); 103 pte = pte_offset_kernel(pmd, address); 104 new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); 105 set_pte(pte, new_pte); 106 } 107} 108 109extern void vmem_map_init(void); 110 111/* 112 * paging_init() sets up the page tables 113 */ 114void __init paging_init(void) 115{ 116 pgd_t *pg_dir; 117 int i; 118 unsigned long pgdir_k; 119 static const int ssm_mask = 0x04000000L; 120 unsigned long max_zone_pfns[MAX_NR_ZONES]; 121 122 pg_dir = swapper_pg_dir; 123 124#ifdef CONFIG_64BIT 125 pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; 126 for (i = 0; i < PTRS_PER_PGD; i++) 127 pgd_clear(pg_dir + i); 128#else 129 pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; 130 for (i = 0; i < PTRS_PER_PGD; i++) 131 pmd_clear((pmd_t *)(pg_dir + i)); 132#endif 133 vmem_map_init(); 134 setup_ro_region(); 135 136 S390_lowcore.kernel_asce = pgdir_k; 137 138 /* enable virtual mapping in kernel mode */ 139 __ctl_load(pgdir_k, 1, 1); 140 __ctl_load(pgdir_k, 7, 7); 141 __ctl_load(pgdir_k, 13, 13); 142 __raw_local_irq_ssm(ssm_mask); 143 144 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 145 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 146 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 147 free_area_init_nodes(max_zone_pfns); 148} 149 150void __init mem_init(void) 151{ 152 unsigned long codesize, reservedpages, datasize, initsize; 153 154 max_mapnr = num_physpages = max_low_pfn; 155 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 156 157 /* clear the zero-page */ 158 memset(empty_zero_page, 0, PAGE_SIZE); 159 160 /* this will put all low memory onto the freelists */ 161 totalram_pages += free_all_bootmem(); 162 163 reservedpages = 0; 164 165 codesize = (unsigned long) &_etext - (unsigned long) &_text; 166 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 167 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 168 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 169 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 170 max_mapnr << (PAGE_SHIFT-10), 171 codesize >> 10, 172 reservedpages << (PAGE_SHIFT-10), 173 datasize >>10, 174 initsize >> 10); 175 printk("Write protected kernel read-only data: %#lx - %#lx\n", 176 (unsigned long)&__start_rodata, 177 PFN_ALIGN((unsigned long)&__end_rodata) - 1); 178 printk("Virtual memmap size: %ldk\n", 179 (max_pfn * sizeof(struct page)) >> 10); 180} 181 182void free_initmem(void) 183{ 184 unsigned long addr; 185 186 addr = (unsigned long)(&__init_begin); 187 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 188 ClearPageReserved(virt_to_page(addr)); 189 init_page_count(virt_to_page(addr)); 190 free_page(addr); 191 totalram_pages++; 192 } 193 printk ("Freeing unused kernel memory: %ldk freed\n", 194 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); 195} 196 197#ifdef CONFIG_BLK_DEV_INITRD 198void free_initrd_mem(unsigned long start, unsigned long end) 199{ 200 if (start < end) 201 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 202 for (; start < end; start += PAGE_SIZE) { 203 ClearPageReserved(virt_to_page(start)); 204 init_page_count(virt_to_page(start)); 205 free_page(start); 206 totalram_pages++; 207 } 208} 209#endif 210