x86: Move kernel boot function to arch/x86/lib/bootm.c

The boot_zimage() function is badly named it can also boot a raw kernel.
Rename it, and try to avoid pointers for memory addresses as it involves
lots of casting.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/bootm.h b/arch/x86/include/asm/bootm.h
index 033ab79..f6a64ce 100644
--- a/arch/x86/include/asm/bootm.h
+++ b/arch/x86/include/asm/bootm.h
@@ -9,4 +9,20 @@
 
 void bootm_announce_and_cleanup(void);
 
+/**
+ * boot_linux_kernel() - boot a linux kernel
+ *
+ * This boots a kernel image, either 32-bit or 64-bit. It will also work with
+ * a self-extracting kernel, if you set @image_64bit to false.
+ *
+ * @setup_base:		Pointer to the setup.bin information for the kernel
+ * @load_address:	Pointer to the start of the kernel image
+ * @image_64bit:	true if the image is a raw 64-bit kernel, false if it
+ *			is raw 32-bit or any type of self-extracting kernel
+ *			such as a bzImage.
+ * @return -ve error code. This function does not return if the kernel was
+ * booted successfully.
+ */
+int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit);
+
 #endif
diff --git a/arch/x86/include/asm/zimage.h b/arch/x86/include/asm/zimage.h
index 0f36662..8e7dd42 100644
--- a/arch/x86/include/asm/zimage.h
+++ b/arch/x86/include/asm/zimage.h
@@ -35,10 +35,8 @@
 unsigned install_e820_map(unsigned max_entries, struct e820entry *);
 
 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
-				void **load_address);
+				ulong *load_addressp);
 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
 		 unsigned long initrd_addr, unsigned long initrd_size);
 
-void boot_zimage(void *setup_base, void *load_address);
-
 #endif