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https://github.com/edk2-porting/linux-next.git
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78c86e5e56
Split __phys_addr out into its own file so we can disable -fstack-protector in a fine-grained fashion. Also it doesn't have terribly much to do with the rest of ioremap.c. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
#include <linux/mmdebug.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include "physaddr.h"
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#ifdef CONFIG_X86_64
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unsigned long __phys_addr(unsigned long x)
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{
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if (x >= __START_KERNEL_map) {
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x -= __START_KERNEL_map;
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VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
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x += phys_base;
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} else {
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VIRTUAL_BUG_ON(x < PAGE_OFFSET);
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x -= PAGE_OFFSET;
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VIRTUAL_BUG_ON(!phys_addr_valid(x));
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}
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return x;
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}
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EXPORT_SYMBOL(__phys_addr);
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bool __virt_addr_valid(unsigned long x)
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{
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if (x >= __START_KERNEL_map) {
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x -= __START_KERNEL_map;
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if (x >= KERNEL_IMAGE_SIZE)
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return false;
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x += phys_base;
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} else {
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if (x < PAGE_OFFSET)
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return false;
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x -= PAGE_OFFSET;
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if (!phys_addr_valid(x))
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return false;
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}
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return pfn_valid(x >> PAGE_SHIFT);
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}
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EXPORT_SYMBOL(__virt_addr_valid);
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#else
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#ifdef CONFIG_DEBUG_VIRTUAL
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unsigned long __phys_addr(unsigned long x)
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{
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/* VMALLOC_* aren't constants */
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VIRTUAL_BUG_ON(x < PAGE_OFFSET);
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VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
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return x - PAGE_OFFSET;
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}
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EXPORT_SYMBOL(__phys_addr);
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#endif
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bool __virt_addr_valid(unsigned long x)
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{
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if (x < PAGE_OFFSET)
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return false;
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if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
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return false;
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if (x >= FIXADDR_START)
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return false;
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return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
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}
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EXPORT_SYMBOL(__virt_addr_valid);
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#endif /* CONFIG_X86_64 */
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