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