| 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 |