1 /* 2 * Copyright (C) 2013 Altera Corporation 3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> 4 * Copyright (C) 2009 Wind River Systems Inc 5 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com 6 * Copyright (C) 2004 Microtronix Datacom Ltd 7 * 8 * based on arch/m68k/mm/init.c 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file "COPYING" in the main directory of this archive 12 * for more details. 13 */ 14 15 #include <linux/signal.h> 16 #include <linux/sched.h> 17 #include <linux/kernel.h> 18 #include <linux/errno.h> 19 #include <linux/string.h> 20 #include <linux/types.h> 21 #include <linux/ptrace.h> 22 #include <linux/mman.h> 23 #include <linux/mm.h> 24 #include <linux/init.h> 25 #include <linux/pagemap.h> 26 #include <linux/memblock.h> 27 #include <linux/slab.h> 28 #include <linux/binfmts.h> 29 30 #include <asm/setup.h> 31 #include <asm/page.h> 32 #include <asm/sections.h> 33 #include <asm/tlb.h> 34 #include <asm/mmu_context.h> 35 #include <asm/cpuinfo.h> 36 #include <asm/processor.h> 37 38 pgd_t *pgd_current; 39 40 /* 41 * paging_init() continues the virtual memory environment setup which 42 * was begun by the code in arch/head.S. 43 * The parameters are pointers to where to stick the starting and ending 44 * addresses of available kernel virtual memory. 45 */ 46 void __init paging_init(void) 47 { 48 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; 49 50 pagetable_init(); 51 pgd_current = swapper_pg_dir; 52 53 max_zone_pfn[ZONE_NORMAL] = max_mapnr; 54 55 /* pass the memory from the bootmem allocator to the main allocator */ 56 free_area_init(max_zone_pfn); 57 58 flush_dcache_range((unsigned long)empty_zero_page, 59 (unsigned long)empty_zero_page + PAGE_SIZE); 60 } 61 62 void __init mem_init(void) 63 { 64 unsigned long end_mem = memory_end; /* this must not include 65 kernel stack at top */ 66 67 pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end); 68 69 end_mem &= PAGE_MASK; 70 high_memory = __va(end_mem); 71 72 /* this will put all memory onto the freelists */ 73 memblock_free_all(); 74 } 75 76 void __init mmu_init(void) 77 { 78 flush_tlb_all(); 79 } 80 81 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE); 82 pte_t invalid_pte_table[PTRS_PER_PTE] __aligned(PAGE_SIZE); 83 static struct page *kuser_page[1]; 84 85 static int alloc_kuser_page(void) 86 { 87 extern char __kuser_helper_start[], __kuser_helper_end[]; 88 int kuser_sz = __kuser_helper_end - __kuser_helper_start; 89 unsigned long vpage; 90 91 vpage = get_zeroed_page(GFP_ATOMIC); 92 if (!vpage) 93 return -ENOMEM; 94 95 /* Copy kuser helpers */ 96 memcpy((void *)vpage, __kuser_helper_start, kuser_sz); 97 98 flush_icache_range(vpage, vpage + KUSER_SIZE); 99 kuser_page[0] = virt_to_page(vpage); 100 101 return 0; 102 } 103 arch_initcall(alloc_kuser_page); 104 105 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 106 { 107 struct mm_struct *mm = current->mm; 108 int ret; 109 110 mmap_write_lock(mm); 111 112 /* Map kuser helpers to user space address */ 113 ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE, 114 VM_READ | VM_EXEC | VM_MAYREAD | 115 VM_MAYEXEC, kuser_page); 116 117 mmap_write_unlock(mm); 118 119 return ret; 120 } 121 122 const char *arch_vma_name(struct vm_area_struct *vma) 123 { 124 return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; 125 } 126 127 static const pgprot_t protection_map[16] = { 128 [VM_NONE] = MKP(0, 0, 0), 129 [VM_READ] = MKP(0, 0, 1), 130 [VM_WRITE] = MKP(0, 0, 0), 131 [VM_WRITE | VM_READ] = MKP(0, 0, 1), 132 [VM_EXEC] = MKP(1, 0, 0), 133 [VM_EXEC | VM_READ] = MKP(1, 0, 1), 134 [VM_EXEC | VM_WRITE] = MKP(1, 0, 0), 135 [VM_EXEC | VM_WRITE | VM_READ] = MKP(1, 0, 1), 136 [VM_SHARED] = MKP(0, 0, 0), 137 [VM_SHARED | VM_READ] = MKP(0, 0, 1), 138 [VM_SHARED | VM_WRITE] = MKP(0, 1, 0), 139 [VM_SHARED | VM_WRITE | VM_READ] = MKP(0, 1, 1), 140 [VM_SHARED | VM_EXEC] = MKP(1, 0, 0), 141 [VM_SHARED | VM_EXEC | VM_READ] = MKP(1, 0, 1), 142 [VM_SHARED | VM_EXEC | VM_WRITE] = MKP(1, 1, 0), 143 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = MKP(1, 1, 1) 144 }; 145 DECLARE_VM_GET_PAGE_PROT 146