forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.2 KiB
127 lines
3.2 KiB
/* |
|
* Copyright (C) 2013 Altera Corporation |
|
* Copyright (C) 2010 Tobias Klauser <[email protected]> |
|
* Copyright (C) 2009 Wind River Systems Inc |
|
* Implemented by [email protected] and [email protected] |
|
* 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/memblock.h> |
|
#include <linux/slab.h> |
|
#include <linux/binfmts.h> |
|
|
|
#include <asm/setup.h> |
|
#include <asm/page.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 max_zone_pfn[MAX_NR_ZONES] = { 0 }; |
|
|
|
pagetable_init(); |
|
pgd_current = swapper_pg_dir; |
|
|
|
max_zone_pfn[ZONE_NORMAL] = max_mapnr; |
|
|
|
/* pass the memory from the bootmem allocator to the main allocator */ |
|
free_area_init(max_zone_pfn); |
|
|
|
flush_dcache_range((unsigned long)empty_zero_page, |
|
(unsigned long)empty_zero_page + PAGE_SIZE); |
|
} |
|
|
|
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 */ |
|
memblock_free_all(); |
|
mem_init_print_info(NULL); |
|
} |
|
|
|
void __init mmu_init(void) |
|
{ |
|
flush_tlb_all(); |
|
} |
|
|
|
#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; |
|
} |
|
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; |
|
|
|
mmap_write_lock(mm); |
|
|
|
/* 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); |
|
|
|
mmap_write_unlock(mm); |
|
|
|
return ret; |
|
} |
|
|
|
const char *arch_vma_name(struct vm_area_struct *vma) |
|
{ |
|
return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; |
|
}
|
|
|