arm64: add support for kernel ASLR

[cascardo/linux.git] / arch / arm64 / include / asm / memory.h

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 18b7e77..5f8667a 100644 (file)
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -24,6 +24,7 @@
 #include <linux/compiler.h>
 #include <linux/const.h>
 #include <linux/types.h>
+#include <asm/bug.h>
 #include <asm/sizes.h>
 
 /*
@@ -52,7 +53,7 @@
 #define KIMAGE_VADDR           (MODULES_END)
 #define MODULES_END            (MODULES_VADDR + MODULES_VSIZE)
 #define MODULES_VADDR          (VA_START + KASAN_SHADOW_SIZE)
-#define MODULES_VSIZE          (SZ_64M)
+#define MODULES_VSIZE          (SZ_128M)
 #define PCI_IO_END             (PAGE_OFFSET - SZ_2M)
 #define PCI_IO_START           (PCI_IO_END - PCI_IO_SIZE)
 #define FIXADDR_TOP            (PCI_IO_START - SZ_2M)
@@ -87,11 +88,11 @@
  */
 #define __virt_to_phys(x) ({                                           \
        phys_addr_t __x = (phys_addr_t)(x);                             \
-       __x >= PAGE_OFFSET ? (__x - PAGE_OFFSET + PHYS_OFFSET) :        \
-                            (__x - KIMAGE_VADDR + PHYS_OFFSET); })
+       __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET :   \
+                                (__x - kimage_voffset); })
 
-#define __phys_to_virt(x)      ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
-#define __phys_to_kimg(x)      ((unsigned long)((x) - PHYS_OFFSET + KIMAGE_VADDR))
+#define __phys_to_virt(x)      ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
+#define __phys_to_kimg(x)      ((unsigned long)((x) + kimage_voffset))
 
 /*
  * Convert a page to/from a physical address
@@ -131,17 +132,24 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/bitops.h>
+#include <linux/mmdebug.h>
+
 extern phys_addr_t             memstart_addr;
 /* PHYS_OFFSET - the physical address of the start of memory. */
-#define PHYS_OFFSET            ({ memstart_addr; })
+#define PHYS_OFFSET            ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
+
+/* the virtual base of the kernel image (minus TEXT_OFFSET) */
+extern u64                     kimage_vaddr;
+
+/* the offset between the kernel virtual and physical mappings */
+extern u64                     kimage_voffset;
 
 /*
- * The maximum physical address that the linear direct mapping
- * of system RAM can cover. (PAGE_OFFSET can be interpreted as
- * a 2's complement signed quantity and negated to derive the
- * maximum size of the linear mapping.)
+ * Allow all memory at the discovery stage. We will clip it later.
  */
-#define MAX_MEMBLOCK_ADDR      ({ memstart_addr - PAGE_OFFSET - 1; })
+#define MIN_MEMBLOCK_ADDR      0
+#define MAX_MEMBLOCK_ADDR      U64_MAX
 
 /*
  * PFNs are used to describe any physical page; this means