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/addrspace.h>
9 #include <asm/sections.h>
10 #include <asm/io.h>
11 #include <asm/page.h>
12 #include <asm/dma.h>
13
14 static inline bool __debug_virt_addr_valid(unsigned long x)
15 {
16 /*
17 * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
18 * actual physical address. Enough code relies on
19 * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it
20 * and always return true.
21 */
22 if (x == MAX_DMA_ADDRESS)
23 return true;
24
25 return x >= PAGE_OFFSET && (KSEGX(x) < KSEG2 ||
26 IS_ENABLED(CONFIG_EVA) ||
27 !IS_ENABLED(CONFIG_HIGHMEM));
28 }
29
30 phys_addr_t __virt_to_phys(volatile const void *x)
31 {
32 WARN(!__debug_virt_addr_valid((unsigned long)x),
33 "virt_to_phys used for non-linear address: %pK (%pS)\n",
34 x, x);
35
36 return __virt_to_phys_nodebug(x);
37 }
38 EXPORT_SYMBOL(__virt_to_phys);
39
40 phys_addr_t __phys_addr_symbol(unsigned long x)
41 {
42 /* This is bounds checking against the kernel image only.
43 * __pa_symbol should only be used on kernel symbol addresses.
44 */
45 VIRTUAL_BUG_ON(x < (unsigned long)_text ||
46 x > (unsigned long)_end);
47
48 return __pa_symbol_nodebug(x);
49 }
50 EXPORT_SYMBOL(__phys_addr_symbol);
51
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