1// SPDX-License-Identifier: GPL-2.0
2#include <linux/bug.h>
3#include <linux/export.h>
4#include <linux/types.h>
5#include <linux/mmdebug.h>
6#include <linux/mm.h>
7
8#include <asm/sections.h>
9#include <asm/page.h>
10#include <asm/fixmap.h>
11#include <asm/dma.h>
12
13#include "mm.h"
14
15static inline bool __virt_addr_valid(unsigned long x)
16{
17	/*
18	 * high_memory does not get immediately defined, and there
19	 * are early callers of __pa() against PAGE_OFFSET
20	 */
21	if (!high_memory && x >= PAGE_OFFSET)
22		return true;
23
24	if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory)
25		return true;
26
27	/*
28	 * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
29	 * actual physical address. Enough code relies on __pa(MAX_DMA_ADDRESS)
30	 * that we just need to work around it and always return true.
31	 */
32	if (x == MAX_DMA_ADDRESS)
33		return true;
34
35	return false;
36}
37
38phys_addr_t __virt_to_phys(unsigned long x)
39{
40	WARN(!__virt_addr_valid(x),
41	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
42	     (void *)x, (void *)x);
43
44	return __virt_to_phys_nodebug(x);
45}
46EXPORT_SYMBOL(__virt_to_phys);
47
48phys_addr_t __phys_addr_symbol(unsigned long x)
49{
50	/* This is bounds checking against the kernel image only.
51	 * __pa_symbol should only be used on kernel symbol addresses.
52	 */
53	VIRTUAL_BUG_ON(x < (unsigned long)KERNEL_START ||
54		       x > (unsigned long)KERNEL_END);
55
56	return __pa_symbol_nodebug(x);
57}
58EXPORT_SYMBOL(__phys_addr_symbol);
59