mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 18:07:03 +00:00
010426079e
We are going to split more MM APIs out of <linux/sched.h>, which will have to be picked up from a couple of .c files. The APIs that we are going to move are: arch_pick_mmap_layout() arch_get_unmapped_area() arch_get_unmapped_area_topdown() mm_update_next_owner() Include the header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/*
|
|
* arch/sh/mm/mmap.c
|
|
*
|
|
* Copyright (C) 2008 - 2009 Paul Mundt
|
|
*
|
|
* 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/io.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/sched/mm.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/module.h>
|
|
#include <asm/page.h>
|
|
#include <asm/processor.h>
|
|
|
|
unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
|
|
EXPORT_SYMBOL(shm_align_mask);
|
|
|
|
#ifdef CONFIG_MMU
|
|
/*
|
|
* To avoid cache aliases, we map the shared page with same color.
|
|
*/
|
|
static inline unsigned long COLOUR_ALIGN(unsigned long addr,
|
|
unsigned long pgoff)
|
|
{
|
|
unsigned long base = (addr + shm_align_mask) & ~shm_align_mask;
|
|
unsigned long off = (pgoff << PAGE_SHIFT) & shm_align_mask;
|
|
|
|
return base + off;
|
|
}
|
|
|
|
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
struct vm_area_struct *vma;
|
|
int do_colour_align;
|
|
struct vm_unmapped_area_info info;
|
|
|
|
if (flags & MAP_FIXED) {
|
|
/* We do not accept a shared mapping if it would violate
|
|
* cache aliasing constraints.
|
|
*/
|
|
if ((flags & MAP_SHARED) &&
|
|
((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
|
|
return -EINVAL;
|
|
return addr;
|
|
}
|
|
|
|
if (unlikely(len > TASK_SIZE))
|
|
return -ENOMEM;
|
|
|
|
do_colour_align = 0;
|
|
if (filp || (flags & MAP_SHARED))
|
|
do_colour_align = 1;
|
|
|
|
if (addr) {
|
|
if (do_colour_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(addr);
|
|
|
|
vma = find_vma(mm, addr);
|
|
if (TASK_SIZE - len >= addr &&
|
|
(!vma || addr + len <= vma->vm_start))
|
|
return addr;
|
|
}
|
|
|
|
info.flags = 0;
|
|
info.length = len;
|
|
info.low_limit = TASK_UNMAPPED_BASE;
|
|
info.high_limit = TASK_SIZE;
|
|
info.align_mask = do_colour_align ? (PAGE_MASK & shm_align_mask) : 0;
|
|
info.align_offset = pgoff << PAGE_SHIFT;
|
|
return vm_unmapped_area(&info);
|
|
}
|
|
|
|
unsigned long
|
|
arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
|
|
const unsigned long len, const unsigned long pgoff,
|
|
const unsigned long flags)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
struct mm_struct *mm = current->mm;
|
|
unsigned long addr = addr0;
|
|
int do_colour_align;
|
|
struct vm_unmapped_area_info info;
|
|
|
|
if (flags & MAP_FIXED) {
|
|
/* We do not accept a shared mapping if it would violate
|
|
* cache aliasing constraints.
|
|
*/
|
|
if ((flags & MAP_SHARED) &&
|
|
((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
|
|
return -EINVAL;
|
|
return addr;
|
|
}
|
|
|
|
if (unlikely(len > TASK_SIZE))
|
|
return -ENOMEM;
|
|
|
|
do_colour_align = 0;
|
|
if (filp || (flags & MAP_SHARED))
|
|
do_colour_align = 1;
|
|
|
|
/* requesting a specific address */
|
|
if (addr) {
|
|
if (do_colour_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(addr);
|
|
|
|
vma = find_vma(mm, addr);
|
|
if (TASK_SIZE - len >= addr &&
|
|
(!vma || addr + len <= vma->vm_start))
|
|
return addr;
|
|
}
|
|
|
|
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
|
|
info.length = len;
|
|
info.low_limit = PAGE_SIZE;
|
|
info.high_limit = mm->mmap_base;
|
|
info.align_mask = do_colour_align ? (PAGE_MASK & shm_align_mask) : 0;
|
|
info.align_offset = pgoff << PAGE_SHIFT;
|
|
addr = vm_unmapped_area(&info);
|
|
|
|
/*
|
|
* A failed mmap() very likely causes application failure,
|
|
* so fall back to the bottom-up function here. This scenario
|
|
* can happen with large stack limits and large mmap()
|
|
* allocations.
|
|
*/
|
|
if (addr & ~PAGE_MASK) {
|
|
VM_BUG_ON(addr != -ENOMEM);
|
|
info.flags = 0;
|
|
info.low_limit = TASK_UNMAPPED_BASE;
|
|
info.high_limit = TASK_SIZE;
|
|
addr = vm_unmapped_area(&info);
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
/*
|
|
* You really shouldn't be using read() or write() on /dev/mem. This
|
|
* might go away in the future.
|
|
*/
|
|
int valid_phys_addr_range(phys_addr_t addr, size_t count)
|
|
{
|
|
if (addr < __MEMORY_START)
|
|
return 0;
|
|
if (addr + count > __pa(high_memory))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
|
|
{
|
|
return 1;
|
|
}
|