ioremap.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2
 3#include <linux/io.h>
 4#include <linux/slab.h>
 5#include <linux/mmzone.h>
 6#include <linux/vmalloc.h>
 7
 8unsigned long ioremap_bot;
 9EXPORT_SYMBOL(ioremap_bot);
10
11void __iomem *ioremap(phys_addr_t addr, unsigned long size)
12{
13	pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
14	void *caller = __builtin_return_address(0);
15
16	return __ioremap_caller(addr, size, prot, caller);
17}
18EXPORT_SYMBOL(ioremap);
19
20void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
21{
22	pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
23	void *caller = __builtin_return_address(0);
24
25	return __ioremap_caller(addr, size, prot, caller);
26}
27EXPORT_SYMBOL(ioremap_wc);
28
29void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
30{
31	pgprot_t prot = pgprot_cached(PAGE_KERNEL);
32	void *caller = __builtin_return_address(0);
33
34	return __ioremap_caller(addr, size, prot, caller);
35}
36
37void __iomem *ioremap_prot(phys_addr_t addr, size_t size, pgprot_t prot)
38{
39	pte_t pte = __pte(pgprot_val(prot));
40	void *caller = __builtin_return_address(0);
41
42	/* writeable implies dirty for kernel addresses */
43	if (pte_write(pte))
44		pte = pte_mkdirty(pte);
45
46	return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
47}
48EXPORT_SYMBOL(ioremap_prot);
49
50int early_ioremap_range(unsigned long ea, phys_addr_t pa,
51			unsigned long size, pgprot_t prot)
52{
53	unsigned long i;
54
55	for (i = 0; i < size; i += PAGE_SIZE) {
56		int err = map_kernel_page(ea + i, pa + i, pgprot_nx(prot));
57
58		if (WARN_ON_ONCE(err))  /* Should clean up */
59			return err;
60	}
61
62	return 0;
63}