mips/mm/physaddr.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/bug.h>
0003 #include <linux/export.h>
0004 #include <linux/types.h>
0005 #include <linux/mmdebug.h>
0006 #include <linux/mm.h>
0007
0008 #include <asm/addrspace.h>
0009 #include <asm/sections.h>
0010 #include <asm/io.h>
0011 #include <asm/page.h>
0012 #include <asm/dma.h>
0013
0014 static inline bool __debug_virt_addr_valid(unsigned long x)
0015 {
0016     /*
0017      * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
0018      * actual physical address. Enough code relies on
0019      * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it
0020      * and always return true.
0021      */
0022     if (x == MAX_DMA_ADDRESS)
0023         return true;
0024
0025     return x >= PAGE_OFFSET && (KSEGX(x) < KSEG2 ||
0026            IS_ENABLED(CONFIG_EVA) ||
0027            !IS_ENABLED(CONFIG_HIGHMEM));
0028 }
0029
0030 phys_addr_t __virt_to_phys(volatile const void *x)
0031 {
0032     WARN(!__debug_virt_addr_valid((unsigned long)x),
0033          "virt_to_phys used for non-linear address: %pK (%pS)\n",
0034          x, x);
0035
0036     return __virt_to_phys_nodebug(x);
0037 }
0038 EXPORT_SYMBOL(__virt_to_phys);
0039
0040 phys_addr_t __phys_addr_symbol(unsigned long x)
0041 {
0042     /* This is bounds checking against the kernel image only.
0043      * __pa_symbol should only be used on kernel symbol addresses.
0044      */
0045     VIRTUAL_BUG_ON(x < (unsigned long)_text ||
0046                x > (unsigned long)_end);
0047
0048     return __pa_symbol_nodebug(x);
0049 }
0050 EXPORT_SYMBOL(__phys_addr_symbol);