Release 4.14 arch/nios2/mm/init.c
/*
* Copyright (C) 2013 Altera Corporation
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2009 Wind River Systems Inc
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* based on arch/m68k/mm/init.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
#include <linux/binfmts.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/cpuinfo.h>
#include <asm/processor.h>
pgd_t *pgd_current;
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
* The parameters are pointers to where to stick the starting and ending
* addresses of available kernel virtual memory.
*/
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES];
memset(zones_size, 0, sizeof(zones_size));
pagetable_init();
pgd_current = swapper_pg_dir;
zones_size[ZONE_NORMAL] = max_mapnr;
/* pass the memory from the bootmem allocator to the main allocator */
free_area_init(zones_size);
flush_dcache_range((unsigned long)empty_zero_page,
(unsigned long)empty_zero_page + PAGE_SIZE);
}
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void __init mem_init(void)
{
unsigned long end_mem = memory_end; /* this must not include
kernel stack at top */
pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
end_mem &= PAGE_MASK;
high_memory = __va(end_mem);
/* this will put all memory onto the freelists */
free_all_bootmem();
mem_init_print_info(NULL);
}
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void __init mmu_init(void)
{
flush_tlb_all();
}
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#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
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#endif
void __ref free_initmem(void)
{
free_initmem_default(-1);
}
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#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
static struct page *kuser_page[1];
static int alloc_kuser_page(void)
{
extern char __kuser_helper_start[], __kuser_helper_end[];
int kuser_sz = __kuser_helper_end - __kuser_helper_start;
unsigned long vpage;
vpage = get_zeroed_page(GFP_ATOMIC);
if (!vpage)
return -ENOMEM;
/* Copy kuser helpers */
memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
flush_icache_range(vpage, vpage + KUSER_SIZE);
kuser_page[0] = virt_to_page(vpage);
return 0;
}
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arch_initcall(alloc_kuser_page);
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
struct mm_struct *mm = current->mm;
int ret;
down_write(&mm->mmap_sem);
/* Map kuser helpers to user space address */
ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
VM_READ | VM_EXEC | VM_MAYREAD |
VM_MAYEXEC, kuser_page);
up_write(&mm->mmap_sem);
return ret;
}
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const char *arch_vma_name(struct vm_area_struct *vma)
{
return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
}
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