x86: introduce kaslr_offset()

[mirror_ubuntu-artful-kernel.git] / arch / x86 / kernel / setup.c

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 98dc9317286e1e0fad25f3d10efaa3134a9134c0..5056d3cfe2667d47f54a0fc777f913bb13200fef 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -122,8 +122,6 @@
 unsigned long max_low_pfn_mapped;
 unsigned long max_pfn_mapped;
 
-bool __read_mostly kaslr_enabled = false;
-
 #ifdef CONFIG_DMI
 RESERVE_BRK(dmi_alloc, 65536);
 #endif
@@ -356,7 +354,7 @@ static void __init relocate_initrd(void)
                mapaddr = ramdisk_image & PAGE_MASK;
                p = early_memremap(mapaddr, clen+slop);
                memcpy(q, p+slop, clen);
-               early_iounmap(p, clen+slop);
+               early_memunmap(p, clen+slop);
                q += clen;
                ramdisk_image += clen;
                ramdisk_size  -= clen;
@@ -427,11 +425,6 @@ static void __init reserve_initrd(void)
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
-static void __init parse_kaslr_setup(u64 pa_data, u32 data_len)
-{
-       kaslr_enabled = (bool)(pa_data + sizeof(struct setup_data));
-}
-
 static void __init parse_setup_data(void)
 {
        struct setup_data *data;
@@ -445,7 +438,7 @@ static void __init parse_setup_data(void)
                data_len = data->len + sizeof(struct setup_data);
                data_type = data->type;
                pa_next = data->next;
-               early_iounmap(data, sizeof(*data));
+               early_memunmap(data, sizeof(*data));
 
                switch (data_type) {
                case SETUP_E820_EXT:
@@ -457,9 +450,6 @@ static void __init parse_setup_data(void)
                case SETUP_EFI:
                        parse_efi_setup(pa_data, data_len);
                        break;
-               case SETUP_KASLR:
-                       parse_kaslr_setup(pa_data, data_len);
-                       break;
                default:
                        break;
                }
@@ -480,7 +470,7 @@ static void __init e820_reserve_setup_data(void)
                         E820_RAM, E820_RESERVED_KERN);
                found = 1;
                pa_data = data->next;
-               early_iounmap(data, sizeof(*data));
+               early_memunmap(data, sizeof(*data));
        }
        if (!found)
                return;
@@ -501,7 +491,7 @@ static void __init memblock_x86_reserve_range_setup_data(void)
                data = early_memremap(pa_data, sizeof(*data));
                memblock_reserve(pa_data, sizeof(*data) + data->len);
                pa_data = data->next;
-               early_iounmap(data, sizeof(*data));
+               early_memunmap(data, sizeof(*data));
        }
 }
 
@@ -842,14 +832,15 @@ static void __init trim_low_memory_range(void)
 static int
 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 {
-       if (kaslr_enabled)
+       if (kaslr_enabled()) {
                pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
-                        (unsigned long)&_text - __START_KERNEL,
+                        kaslr_offset(),
                         __START_KERNEL,
                         __START_KERNEL_map,
                         MODULES_VADDR-1);
-       else
+       } else {
                pr_emerg("Kernel Offset: disabled\n");
+       }
 
        return 0;
 }