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5ccc6af5e8
This patch contains the initialisation of the memory blocks, MMU attributes and the memory map. Signed-off-by: Ley Foon Tan <lftan@altera.com>
143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/*
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* Copyright (C) 2013 Altera Corporation
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2009 Wind River Systems Inc
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* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
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* Copyright (C) 2004 Microtronix Datacom Ltd
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*
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* based on arch/m68k/mm/init.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <linux/binfmts.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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#include <asm/mmu_context.h>
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#include <asm/cpuinfo.h>
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#include <asm/processor.h>
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pgd_t *pgd_current;
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/*
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* paging_init() continues the virtual memory environment setup which
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* was begun by the code in arch/head.S.
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* The parameters are pointers to where to stick the starting and ending
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* addresses of available kernel virtual memory.
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*/
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void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES];
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memset(zones_size, 0, sizeof(zones_size));
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pagetable_init();
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pgd_current = swapper_pg_dir;
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zones_size[ZONE_NORMAL] = max_mapnr;
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/* pass the memory from the bootmem allocator to the main allocator */
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free_area_init(zones_size);
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flush_dcache_range((unsigned long)empty_zero_page,
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(unsigned long)empty_zero_page + PAGE_SIZE);
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}
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void __init mem_init(void)
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{
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unsigned long end_mem = memory_end; /* this must not include
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kernel stack at top */
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pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
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end_mem &= PAGE_MASK;
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high_memory = __va(end_mem);
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/* this will put all memory onto the freelists */
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free_all_bootmem();
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mem_init_print_info(NULL);
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}
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void __init mmu_init(void)
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{
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flush_tlb_all();
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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#endif
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void __init_refok free_initmem(void)
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{
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free_initmem_default(-1);
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}
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#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
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pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
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static struct page *kuser_page[1];
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static int alloc_kuser_page(void)
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{
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extern char __kuser_helper_start[], __kuser_helper_end[];
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int kuser_sz = __kuser_helper_end - __kuser_helper_start;
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unsigned long vpage;
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vpage = get_zeroed_page(GFP_ATOMIC);
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if (!vpage)
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return -ENOMEM;
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/* Copy kuser helpers */
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memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
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flush_icache_range(vpage, vpage + KUSER_SIZE);
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kuser_page[0] = virt_to_page(vpage);
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return 0;
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}
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arch_initcall(alloc_kuser_page);
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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{
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struct mm_struct *mm = current->mm;
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int ret;
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down_write(&mm->mmap_sem);
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/* Map kuser helpers to user space address */
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ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
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VM_READ | VM_EXEC | VM_MAYREAD |
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VM_MAYEXEC, kuser_page);
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up_write(&mm->mmap_sem);
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return ret;
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}
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
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}
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