1 files changed, 180 insertions, 96 deletions

diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index 8b42b5caf..bb4051717 100644
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2011 The Chromium OS Authors.
  * (C) Copyright 2002
  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  *
@@ -51,6 +52,16 @@
 
 #define COMMAND_LINE_SIZE	2048
 
+unsigned generic_install_e820_map(unsigned max_entries,
+				  struct e820entry *entries)
+{
+	return 0;
+}
+
+unsigned install_e820_map(unsigned max_entries,
+			  struct e820entry *entries)
+	__attribute__((weak, alias("generic_install_e820_map")));
+
 static void build_command_line(char *command_line, int auto_boot)
 {
 	char *env_command_line;
@@ -78,40 +89,47 @@ static void build_command_line(char *command_line, int auto_boot)
 	printf("Kernel command line: \"%s\"\n", command_line);
 }
 
-void *load_zimage(char *image, unsigned long kernel_size,
-		  unsigned long initrd_addr, unsigned long initrd_size,
-		  int auto_boot)
+static int kernel_magic_ok(struct setup_header *hdr)
 {
-	void *setup_base;
-	int setup_size;
-	int bootproto;
-	int big_image;
-	void *load_address;
-	struct setup_header *hdr;
-
-	hdr = (struct setup_header *)(image + SETUP_SECTS_OFF);
-
-	/* base address for real-mode segment */
-	setup_base = (void *)DEFAULT_SETUP_BASE;
-
 	if (KERNEL_MAGIC != hdr->boot_flag) {
-		printf("Error: Invalid Boot Flag (found 0x%04x, expected 0x%04x)\n",
-		       hdr->boot_flag, KERNEL_MAGIC);
+		printf("Error: Invalid Boot Flag "
+			"(found 0x%04x, expected 0x%04x)\n",
+			hdr->boot_flag, KERNEL_MAGIC);
 		return 0;
 	} else {
 		printf("Valid Boot Flag\n");
+		return 1;
 	}
+}
 
-	/* determine boot protocol version */
-	if (KERNEL_V2_MAGIC == hdr->header) {
+static int get_boot_protocol(struct setup_header *hdr)
+{
+	if (hdr->header == KERNEL_V2_MAGIC) {
 		printf("Magic signature found\n");
-
-		bootproto = hdr->version;
+		return hdr->version;
 	} else {
 		/* Very old kernel */
 		printf("Magic signature not found\n");
-		bootproto = 0x0100;
+		return 0x0100;
 	}
+}
+
+struct boot_params *load_zimage(char *image, unsigned long kernel_size,
+				void **load_address)
+{
+	struct boot_params *setup_base;
+	int setup_size;
+	int bootproto;
+	int big_image;
+
+	struct boot_params *params = (struct boot_params *)image;
+	struct setup_header *hdr = &params->hdr;
+
+	/* base address for real-mode segment */
+	setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
+
+	if (!kernel_magic_ok(hdr))
+		return 0;
 
 	/* determine size of setup */
 	if (0 == hdr->setup_sects) {
@@ -126,27 +144,50 @@ void *load_zimage(char *image, unsigned long kernel_size,
 	if (setup_size > SETUP_MAX_SIZE)
 		printf("Error: Setup is too large (%d bytes)\n", setup_size);
 
+	/* determine boot protocol version */
+	bootproto = get_boot_protocol(hdr);
+
+	printf("Using boot protocol version %x.%02x\n",
+	       (bootproto & 0xff00) >> 8, bootproto & 0xff);
+
+	if (bootproto >= 0x0200) {
+		if (hdr->setup_sects >= 15) {
+			printf("Linux kernel version %s\n",
+				(char *)params +
+				hdr->kernel_version + 0x200);
+		} else {
+			printf("Setup Sectors < 15 - "
+				"Cannot print kernel version.\n");
+		}
+	}
+
 	/* Determine image type */
 	big_image = (bootproto >= 0x0200) &&
 		    (hdr->loadflags & BIG_KERNEL_FLAG);
 
 	/* Determine load address */
-	load_address = (void *)(big_image ?
-				BZIMAGE_LOAD_ADDR :
-				ZIMAGE_LOAD_ADDR);
+	if (big_image)
+		*load_address = (void *)BZIMAGE_LOAD_ADDR;
+	else
+		*load_address = (void *)ZIMAGE_LOAD_ADDR;
 
+#if defined CONFIG_ZBOOT_32
+	printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
+	memset(setup_base, 0, sizeof(*setup_base));
+	setup_base->hdr = params->hdr;
+#else
 	/* load setup */
 	printf("Moving Real-Mode Code to 0x%8.8lx (%d bytes)\n",
 	       (ulong)setup_base, setup_size);
 	memmove(setup_base, image, setup_size);
+#endif
 
-	printf("Using boot protocol version %x.%02x\n",
-	       (bootproto & 0xff00) >> 8, bootproto & 0xff);
+	if (bootproto >= 0x0204)
+		kernel_size = hdr->syssize * 16;
+	else
+		kernel_size -= setup_size;
 
 	if (bootproto == 0x0100) {
-		*(u16 *)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
-		*(u16 *)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;
-
 		/*
 		 * A very old kernel MUST have its real-mode code
 		 * loaded at 0x90000
@@ -157,33 +198,60 @@ void *load_zimage(char *image, unsigned long kernel_size,
 
 			/* Copy the command line */
 			memmove((void *)0x99000,
-				setup_base + COMMAND_LINE_OFFSET,
+				(u8 *)setup_base + COMMAND_LINE_OFFSET,
 				COMMAND_LINE_SIZE);
 
 			 /* Relocated */
-			setup_base = (void *)0x90000;
+			setup_base = (struct boot_params *)0x90000;
 		}
 
 		/* It is recommended to clear memory up to the 32K mark */
-		memset((void *)0x90000 + setup_size, 0,
-		       SETUP_MAX_SIZE-setup_size);
+		memset((u8 *)0x90000 + setup_size, 0,
+		       SETUP_MAX_SIZE - setup_size);
+	}
+
+	if (big_image) {
+		if (kernel_size > BZIMAGE_MAX_SIZE) {
+			printf("Error: bzImage kernel too big! "
+				"(size: %ld, max: %d)\n",
+				kernel_size, BZIMAGE_MAX_SIZE);
+			return 0;
+		}
+	} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
+		printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
+		       kernel_size, ZIMAGE_MAX_SIZE);
+		return 0;
 	}
 
-	/* We are now setting up the real-mode version of the header */
-	hdr = (struct setup_header *)(setup_base + SETUP_SECTS_OFF);
+	printf("Loading %s at address %p (%ld bytes)\n",
+		big_image ? "bzImage" : "zImage", *load_address, kernel_size);
+
+	memmove(*load_address, image + setup_size, kernel_size);
 
+	return setup_base;
+}
+
+int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
+		 unsigned long initrd_addr, unsigned long initrd_size)
+{
+	struct setup_header *hdr = &setup_base->hdr;
+	int bootproto = get_boot_protocol(hdr);
+
+#if defined CONFIG_ZBOOT_32
+	setup_base->e820_entries = install_e820_map(
+		ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
+#endif
+
+	if (bootproto == 0x0100) {
+		setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
+		setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
+	}
 	if (bootproto >= 0x0200) {
 		hdr->type_of_loader = 8;
 
-		if (hdr->setup_sects >= 15)
-			printf("Linux kernel version %s\n",
-			       (char *)(setup_base +
-					(hdr->kernel_version + 0x200)));
-		else
-			printf("Setup Sectors < 15 - Cannot print kernel version.\n");
-
 		if (initrd_addr) {
-			printf("Initial RAM disk at linear address 0x%08lx, size %ld bytes\n",
+			printf("Initial RAM disk at linear address "
+			       "0x%08lx, size %ld bytes\n",
 			       initrd_addr, initrd_size);
 
 			hdr->ramdisk_image = initrd_addr;
@@ -197,49 +265,42 @@ void *load_zimage(char *image, unsigned long kernel_size,
 	}
 
 	if (bootproto >= 0x0202) {
-		hdr->cmd_line_ptr = (u32)setup_base + COMMAND_LINE_OFFSET;
+		hdr->cmd_line_ptr = (uintptr_t)cmd_line;
 	} else if (bootproto >= 0x0200) {
-
-		*(u16 *)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
-		*(u16 *)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;
+		setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
+		setup_base->screen_info.cl_offset =
+			(uintptr_t)cmd_line - (uintptr_t)setup_base;
 
 		hdr->setup_move_size = 0x9100;
 	}
 
-	if (bootproto >= 0x0204)
-		kernel_size = hdr->syssize * 16;
-	else
-		kernel_size -= setup_size;
-
-
-	if (big_image) {
-		if ((kernel_size) > BZIMAGE_MAX_SIZE) {
-			printf("Error: bzImage kernel too big! (size: %ld, max: %d)\n",
-			       kernel_size, BZIMAGE_MAX_SIZE);
-			return 0;
-		}
-
-	} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
-		printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
-		       kernel_size, ZIMAGE_MAX_SIZE);
-		return 0;
-	}
-
 	/* build command line at COMMAND_LINE_OFFSET */
-	build_command_line(setup_base + COMMAND_LINE_OFFSET, auto_boot);
-
-	printf("Loading %czImage at address 0x%08x (%ld bytes)\n",
-	       big_image ? 'b' : ' ', (u32)load_address, kernel_size);
-
-
-	memmove(load_address, image + setup_size, kernel_size);
-
-	/* ready for booting */
-	return setup_base;
+	build_command_line(cmd_line, auto_boot);
+	return 0;
 }
 
-void boot_zimage(void *setup_base)
+void boot_zimage(void *setup_base, void *load_address)
 {
+	printf("\nStarting kernel ...\n\n");
+
+#if defined CONFIG_ZBOOT_32
+	/*
+	 * 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)
+	:  "%ebp"
+	);
+#else
 	struct pt_regs regs;
 
 	memset(&regs, 0, sizeof(struct pt_regs));
@@ -248,56 +309,79 @@ void boot_zimage(void *setup_base)
 	regs.xss = regs.xds;
 	regs.esp = 0x9000;
 	regs.eflags = 0;
-	enter_realmode(((u32)setup_base+SETUP_START_OFFSET)>>4, 0, &regs,
-		       &regs);
+	enter_realmode(((u32)setup_base + SETUP_START_OFFSET) >> 4, 0,
+		       &regs, &regs);
+#endif
 }
 
 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-	void *base_ptr;
+	struct boot_params *base_ptr;
 	void *bzImage_addr = NULL;
+	void *load_address;
 	char *s;
 	ulong bzImage_size = 0;
+	ulong initrd_addr = 0;
+	ulong initrd_size = 0;
 
 	disable_interrupts();
 
 	/* Setup board for maximum PC/AT Compatibility */
 	setup_pcat_compatibility();
 
-	if (argc >= 2)
+	if (argc >= 2) {
 		/* argv[1] holds the address of the bzImage */
 		s = argv[1];
-	else
+	} else {
 		s = getenv("fileaddr");
+	}
 
 	if (s)
 		bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
 
-	if (argc >= 3)
+	if (argc >= 3) {
 		/* argv[2] holds the size of the bzImage */
 		bzImage_size = simple_strtoul(argv[2], NULL, 16);
+	}
+
+	if (argc >= 4)
+		initrd_addr = simple_strtoul(argv[3], NULL, 16);
+	if (argc >= 5)
+		initrd_size = simple_strtoul(argv[4], NULL, 16);
 
-	/* Lets look for*/
-	base_ptr = load_zimage(bzImage_addr, bzImage_size, 0, 0, 0);
+	/* Lets look for */
+	base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
 
 	if (!base_ptr) {
 		printf("## Kernel loading failed ...\n");
-	} else {
-		printf("## Transferring control to Linux (at address %08x) ...\n",
-			(u32)base_ptr);
+		return -1;
+	}
+	if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
+			0, initrd_addr, initrd_size)) {
+		printf("Setting up boot parameters failed ...\n");
+		return -1;
+	}
 
-		/* we assume that the kernel is in place */
-		printf("\nStarting kernel ...\n\n");
+	printf("## Transferring control to Linux "
+	       "(at address %08x) ...\n",
+	       (u32)base_ptr);
 
-		boot_zimage(base_ptr);
-		/* does not return */
-	}
+	/* we assume that the kernel is in place */
+	boot_zimage(base_ptr, load_address);
+	/* does not return */
 
 	return -1;
 }
 
 U_BOOT_CMD(
-	zboot, 2, 0,	do_zboot,
+	zboot, 5, 0,	do_zboot,
 	"Boot bzImage",
-	""
+	"[addr] [size] [initrd addr] [initrd size]\n"
+	"      addr -        The optional starting address of the bzimage.\n"
+	"                    If not set it defaults to the environment\n"
+	"                    variable \"fileaddr\".\n"
+	"      size -        The optional size of the bzimage. Defaults to\n"
+	"                    zero.\n"
+	"      initrd addr - The address of the initrd image to use, if any.\n"
+	"      initrd size - The size of the initrd image to use, if any.\n"
 );