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git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - mm/ioremap.c
1 // SPDX-License-Identifier: GPL-2.0
3 * Re-map IO memory to kernel address space so that we can access it.
4 * This is needed for high PCI addresses that aren't mapped in the
5 * 640k-1MB IO memory area on PC's
7 * (C) Copyright 1995 1996 Linus Torvalds
9 #include <linux/vmalloc.h>
12 #include <linux/export.h>
14 void __iomem
*ioremap_prot(phys_addr_t addr
, size_t size
, unsigned long prot
)
16 unsigned long offset
, vaddr
;
17 phys_addr_t last_addr
;
18 struct vm_struct
*area
;
20 /* Disallow wrap-around or zero size */
21 last_addr
= addr
+ size
- 1;
22 if (!size
|| last_addr
< addr
)
25 /* Page-align mappings */
26 offset
= addr
& (~PAGE_MASK
);
28 size
= PAGE_ALIGN(size
+ offset
);
30 area
= get_vm_area_caller(size
, VM_IOREMAP
,
31 __builtin_return_address(0));
34 vaddr
= (unsigned long)area
->addr
;
36 if (ioremap_page_range(vaddr
, vaddr
+ size
, addr
, __pgprot(prot
))) {
41 return (void __iomem
*)(vaddr
+ offset
);
43 EXPORT_SYMBOL(ioremap_prot
);
45 void iounmap(volatile void __iomem
*addr
)
47 vunmap((void *)((unsigned long)addr
& PAGE_MASK
));
49 EXPORT_SYMBOL(iounmap
);