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>

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

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

arch/x86/lib/bootm.c

@@ -10,6 +10,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <errno.h>
 #include <fdt_support.h>
 #include <image.h>
 #include <u-boot/zlib.h>
@@ -109,11 +110,11 @@ static int boot_prep_linux(bootm_headers_t *images)
 	}
 
 	if (is_zimage) {
-		void *load_address;
+		ulong load_address;
 		char *base_ptr;
 
 		base_ptr = (char *)load_zimage(data, len, &load_address);
-		images->os.load = (ulong)load_address;
+		images->os.load = load_address;
 		cmd_line_dest = base_ptr + COMMAND_LINE_OFFSET;
 		images->ep = (ulong)base_ptr;
 	} else if (images->ep) {
@@ -139,16 +140,45 @@ error:
 	return 1;
 }
 
+int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit)
+{
+	bootm_announce_and_cleanup();
+
+#ifdef CONFIG_SYS_COREBOOT
+	timestamp_add_now(TS_U_BOOT_START_KERNEL);
+#endif
+	if (image_64bit) {
+		/* TODO(boot 64-bit kernel) */
+	} else {
+		/*
+		* Set %ebx, %ebp, and %edi to 0, %esi to point to the
+		* boot_params structure, and then jump to the kernel. We
+		* assume that %cs is 0x10, 4GB flat, and read/execute, and
+		* the data segments are 0x18, 4GB flat, and read/write.
+		* U-boot is setting them up that way for itself in
+		* arch/i386/cpu/cpu.c.
+		*/
+		__asm__ __volatile__ (
+		"movl $0, %%ebp\n"
+		"cli\n"
+		"jmp *%[kernel_entry]\n"
+		:: [kernel_entry]"a"(load_address),
+		[boot_params] "S"(setup_base),
+		"b"(0), "D"(0)
+		);
+	}
+
+	/* We can't get to here */
+	return -EFAULT;
+}
+
 /* Subcommand: GO */
 static int boot_jump_linux(bootm_headers_t *images)
 {
 	debug("## Transferring control to Linux (at address %08lx, kernel %08lx) ...\n",
 	      images->ep, images->os.load);
 
-	boot_zimage((struct boot_params *)images->ep, (void *)images->os.load);
-	/* does not return */
-
-	return 1;
+	return boot_linux_kernel(images->ep, images->os.load, false);
 }
 
 int do_bootm_linux(int flag, int argc, char * const argv[],
@@ -161,10 +191,8 @@ int do_bootm_linux(int flag, int argc, char * const argv[],
 	if (flag & BOOTM_STATE_OS_PREP)
 		return boot_prep_linux(images);
 
-	if (flag & BOOTM_STATE_OS_GO) {
-		boot_jump_linux(images);
-		return 0;
-	}
+	if (flag & BOOTM_STATE_OS_GO)
+		return boot_jump_linux(images);
 
 	return boot_jump_linux(images);
 }

arch/x86/lib/zimage.c

@@ -103,7 +103,7 @@ static int get_boot_protocol(struct setup_header *hdr)
 }
 
 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
-				void **load_address)
+				ulong *load_addressp)
 {
 	struct boot_params *setup_base;
 	int setup_size;
@@ -155,9 +155,9 @@ struct boot_params *load_zimage(char *image, unsigned long kernel_size,
 
 	/* Determine load address */
 	if (big_image)
-		*load_address = (void *)BZIMAGE_LOAD_ADDR;
+		*load_addressp = BZIMAGE_LOAD_ADDR;
 	else
-		*load_address = (void *)ZIMAGE_LOAD_ADDR;
+		*load_addressp = ZIMAGE_LOAD_ADDR;
 
 	printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
 	memset(setup_base, 0, sizeof(*setup_base));
@@ -204,10 +204,10 @@ struct boot_params *load_zimage(char *image, unsigned long kernel_size,
 		return 0;
 	}
 
-	printf("Loading %s at address %p (%ld bytes)\n",
-		big_image ? "bzImage" : "zImage", *load_address, kernel_size);
+	printf("Loading %s at address %lx (%ld bytes)\n",
+	       big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
 
-	memmove(*load_address, image + setup_size, kernel_size);
+	memmove((void *)*load_addressp, image + setup_size, kernel_size);
 
 	return setup_base;
 }
@@ -261,30 +261,6 @@ int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
 	return 0;
 }
 
-void boot_zimage(void *setup_base, void *load_address)
-{
-	bootm_announce_and_cleanup();
-
-#ifdef CONFIG_SYS_COREBOOT
-	timestamp_add_now(TS_U_BOOT_START_KERNEL);
-#endif
-	/*
-	 * Set %ebx, %ebp, and %edi to 0, %esi to point to the boot_params
-	 * structure, and then jump to the kernel. We assume that %cs is
-	 * 0x10, 4GB flat, and read/execute, and the data segments are 0x18,
-	 * 4GB flat, and read/write. U-boot is setting them up that way for
-	 * itself in arch/i386/cpu/cpu.c.
-	 */
-	__asm__ __volatile__ (
-	"movl $0, %%ebp\n"
-	"cli\n"
-	"jmp *%[kernel_entry]\n"
-	:: [kernel_entry]"a"(load_address),
-	   [boot_params] "S"(setup_base),
-	   "b"(0), "D"(0)
-	);
-}
-
 void setup_pcat_compatibility(void)
 	__attribute__((weak, alias("__setup_pcat_compatibility")));
 
@@ -296,7 +272,7 @@ int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct boot_params *base_ptr;
 	void *bzImage_addr = NULL;
-	void *load_address;
+	ulong load_address;
 	char *s;
 	ulong bzImage_size = 0;
 	ulong initrd_addr = 0;
@@ -341,10 +317,7 @@ int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 	}
 
 	/* we assume that the kernel is in place */
-	boot_zimage(base_ptr, load_address);
-	/* does not return */
-
-	return -1;
+	return boot_linux_kernel((ulong)base_ptr, load_address, false);
 }
 
 U_BOOT_CMD(