x86: Add get_ramdisk_image/size()

There are several places to find ramdisk information early for reserving
and relocating.

Use accessor functions to make code more readable and consistent.

Later will add ext_ramdisk_image/size in those functions to support
loading ramdisk above 4g.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-16-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 8e35692..83b3861 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -294,12 +294,25 @@ static void __init reserve_brk(void)
 
 #ifdef CONFIG_BLK_DEV_INITRD
 
+static u64 __init get_ramdisk_image(void)
+{
+       u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+
+       return ramdisk_image;
+}
+static u64 __init get_ramdisk_size(void)
+{
+       u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+
+       return ramdisk_size;
+}
+
 #define MAX_MAP_CHUNK  (NR_FIX_BTMAPS << PAGE_SHIFT)
 static void __init relocate_initrd(void)
 {
        /* Assume only end is not page aligned */
-       u64 ramdisk_image = boot_params.hdr.ramdisk_image;
-       u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
+       u64 ramdisk_image = get_ramdisk_image();
+       u64 ramdisk_size  = get_ramdisk_size();
        u64 area_size     = PAGE_ALIGN(ramdisk_size);
        u64 ramdisk_here;
        unsigned long slop, clen, mapaddr;
@@ -338,8 +351,8 @@ static void __init relocate_initrd(void)
                ramdisk_size  -= clen;
        }
 
-       ramdisk_image = boot_params.hdr.ramdisk_image;
-       ramdisk_size  = boot_params.hdr.ramdisk_size;
+       ramdisk_image = get_ramdisk_image();
+       ramdisk_size  = get_ramdisk_size();
        printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
                " [mem %#010llx-%#010llx]\n",
                ramdisk_image, ramdisk_image + ramdisk_size - 1,
@@ -363,8 +376,8 @@ static u64 __init get_mem_size(unsigned long limit_pfn)
 static void __init early_reserve_initrd(void)
 {
        /* Assume only end is not page aligned */
-       u64 ramdisk_image = boot_params.hdr.ramdisk_image;
-       u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
+       u64 ramdisk_image = get_ramdisk_image();
+       u64 ramdisk_size  = get_ramdisk_size();
        u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 
        if (!boot_params.hdr.type_of_loader ||
@@ -376,8 +389,8 @@ static void __init early_reserve_initrd(void)
 static void __init reserve_initrd(void)
 {
        /* Assume only end is not page aligned */
-       u64 ramdisk_image = boot_params.hdr.ramdisk_image;
-       u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
+       u64 ramdisk_image = get_ramdisk_image();
+       u64 ramdisk_size  = get_ramdisk_size();
        u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
        u64 mapped_size;