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 | |
15 | static 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 | |
38 | phys_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 | } |
46 | EXPORT_SYMBOL(__virt_to_phys); |
47 | |
48 | phys_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 | } |
58 | EXPORT_SYMBOL(__phys_addr_symbol); |
59 |