1 files changed, 118 insertions, 251 deletions

diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c
index 6f6b50d238b6..56b56a8d4b23 100644
--- a/arch/powerpc/boot/main.c
+++ b/arch/powerpc/boot/main.c
@@ -14,11 +14,10 @@
 #include "page.h"
 #include "string.h"
 #include "stdio.h"
-#include "zlib.h"
 #include "ops.h"
+#include "gunzip_util.h"
 #include "flatdevtree.h"
-
-extern void flush_cache(void *, unsigned long);
+#include "reg.h"
 
 extern char _start[];
 extern char __bss_start[];
@@ -30,304 +29,173 @@ extern char _initrd_end[];
 extern char _dtb_start[];
 extern char _dtb_end[];
 
+static struct gunzip_state gzstate;
+
 struct addr_range {
-	unsigned long addr;
+	void *addr;
 	unsigned long size;
-	unsigned long memsize;
 };
-static struct addr_range vmlinux;
-static struct addr_range vmlinuz;
-static struct addr_range initrd;
-
-static unsigned long elfoffset;
-static int is_64bit;
-
-/* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */
-static char scratch[46912];
-static char elfheader[256];
 
 typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);
 
 #undef DEBUG
 
-#define HEAD_CRC	2
-#define EXTRA_FIELD	4
-#define ORIG_NAME	8
-#define COMMENT		0x10
-#define RESERVED	0xe0
-
-static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
+static struct addr_range prep_kernel(void)
 {
-	z_stream s;
-	int r, i, flags;
-
-	/* skip header */
-	i = 10;
-	flags = src[3];
-	if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
-		printf("bad gzipped data\n\r");
-		exit();
-	}
-	if ((flags & EXTRA_FIELD) != 0)
-		i = 12 + src[10] + (src[11] << 8);
-	if ((flags & ORIG_NAME) != 0)
-		while (src[i++] != 0)
-			;
-	if ((flags & COMMENT) != 0)
-		while (src[i++] != 0)
-			;
-	if ((flags & HEAD_CRC) != 0)
-		i += 2;
-	if (i >= *lenp) {
-		printf("gunzip: ran out of data in header\n\r");
-		exit();
-	}
+	char elfheader[256];
+	void *vmlinuz_addr = _vmlinux_start;
+	unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
+	void *addr = 0;
+	struct elf_info ei;
+	int len;
 
-	if (zlib_inflate_workspacesize() > sizeof(scratch)) {
-		printf("gunzip needs more mem\n");
-		exit();
-	}
-	memset(&s, 0, sizeof(s));
-	s.workspace = scratch;
-	r = zlib_inflateInit2(&s, -MAX_WBITS);
-	if (r != Z_OK) {
-		printf("inflateInit2 returned %d\n\r", r);
-		exit();
-	}
-	s.next_in = src + i;
-	s.avail_in = *lenp - i;
-	s.next_out = dst;
-	s.avail_out = dstlen;
-	r = zlib_inflate(&s, Z_FULL_FLUSH);
-	if (r != Z_OK && r != Z_STREAM_END) {
-		printf("inflate returned %d msg: %s\n\r", r, s.msg);
-		exit();
+	/* gunzip the ELF header of the kernel */
+	gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);
+	gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));
+
+	if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
+		fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
+
+	if (platform_ops.image_hdr)
+		platform_ops.image_hdr(elfheader);
+
+	/* We need to alloc the memsize: gzip will expand the kernel
+	 * text/data, then possible rubbish we don't care about. But
+	 * the kernel bss must be claimed (it will be zero'd by the
+	 * kernel itself)
+	 */
+	printf("Allocating 0x%lx bytes for kernel ...\n\r", ei.memsize);
+
+	if (platform_ops.vmlinux_alloc) {
+		addr = platform_ops.vmlinux_alloc(ei.memsize);
+	} else {
+		if ((unsigned long)_start < ei.memsize)
+			fatal("Insufficient memory for kernel at address 0!"
+			       " (_start=%p)\n\r", _start);
 	}
-	*lenp = s.next_out - (unsigned char *) dst;
-	zlib_inflateEnd(&s);
-}
 
-static int is_elf64(void *hdr)
-{
-	Elf64_Ehdr *elf64 = hdr;
-	Elf64_Phdr *elf64ph;
-	unsigned int i;
-
-	if (!(elf64->e_ident[EI_MAG0]  == ELFMAG0	&&
-	      elf64->e_ident[EI_MAG1]  == ELFMAG1	&&
-	      elf64->e_ident[EI_MAG2]  == ELFMAG2	&&
-	      elf64->e_ident[EI_MAG3]  == ELFMAG3	&&
-	      elf64->e_ident[EI_CLASS] == ELFCLASS64	&&
-	      elf64->e_ident[EI_DATA]  == ELFDATA2MSB	&&
-	      elf64->e_type            == ET_EXEC	&&
-	      elf64->e_machine         == EM_PPC64))
-		return 0;
-
-	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
-				 (unsigned long)elf64->e_phoff);
-	for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
-		if (elf64ph->p_type == PT_LOAD)
-			break;
-	if (i >= (unsigned int)elf64->e_phnum)
-		return 0;
-
-	elfoffset = (unsigned long)elf64ph->p_offset;
-	vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
-	vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
-
-	is_64bit = 1;
-	return 1;
-}
+	/* Finally, gunzip the kernel */
+	printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,
+	       vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
+	/* discard up to the actual load data */
+	gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));
+	len = gunzip_finish(&gzstate, addr, ei.loadsize);
+	if (len != ei.loadsize)
+		fatal("ran out of data!  only got 0x%x of 0x%lx bytes.\n\r",
+				len, ei.loadsize);
+	printf("done 0x%x bytes\n\r", len);
 
-static int is_elf32(void *hdr)
-{
-	Elf32_Ehdr *elf32 = hdr;
-	Elf32_Phdr *elf32ph;
-	unsigned int i;
-
-	if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0	&&
-	      elf32->e_ident[EI_MAG1]  == ELFMAG1	&&
-	      elf32->e_ident[EI_MAG2]  == ELFMAG2	&&
-	      elf32->e_ident[EI_MAG3]  == ELFMAG3	&&
-	      elf32->e_ident[EI_CLASS] == ELFCLASS32	&&
-	      elf32->e_ident[EI_DATA]  == ELFDATA2MSB	&&
-	      elf32->e_type            == ET_EXEC	&&
-	      elf32->e_machine         == EM_PPC))
-		return 0;
-
-	elf32 = (Elf32_Ehdr *)elfheader;
-	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
-	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
-		if (elf32ph->p_type == PT_LOAD)
-			break;
-	if (i >= elf32->e_phnum)
-		return 0;
-
-	elfoffset = elf32ph->p_offset;
-	vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
-	vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
-	return 1;
+	flush_cache(addr, ei.loadsize);
+
+	return (struct addr_range){addr, ei.memsize};
 }
 
-static void prep_kernel(unsigned long a1, unsigned long a2)
+static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
+				     unsigned long initrd_addr,
+				     unsigned long initrd_size)
 {
-	int len;
-
-	vmlinuz.addr = (unsigned long)_vmlinux_start;
-	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
-
-	/* gunzip the ELF header of the kernel */
-	if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
-		len = vmlinuz.size;
-		gunzip(elfheader, sizeof(elfheader),
-				(unsigned char *)vmlinuz.addr, &len);
-	} else
-		memcpy(elfheader, (const void *)vmlinuz.addr,
-		       sizeof(elfheader));
-
-	if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
-		printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
-		exit();
+	/* If we have an image attached to us, it overrides anything
+	 * supplied by the loader. */
+	if (_initrd_end > _initrd_start) {
+		printf("Attached initrd image at 0x%p-0x%p\n\r",
+		       _initrd_start, _initrd_end);
+		initrd_addr = (unsigned long)_initrd_start;
+		initrd_size = _initrd_end - _initrd_start;
+	} else if (initrd_size > 0) {
+		printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
+		       initrd_addr, initrd_addr + initrd_size);
 	}
-	if (platform_ops.image_hdr)
-		platform_ops.image_hdr(elfheader);
 
-	/* We need to alloc the memsize plus the file offset since gzip
-	 * will expand the header (file offset), then the kernel, then
-	 * possible rubbish we don't care about. But the kernel bss must
-	 * be claimed (it will be zero'd by the kernel itself)
-	 */
-	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
-	vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
-	if (vmlinux.addr == 0) {
-		printf("Can't allocate memory for kernel image !\n\r");
-		exit();
-	}
+	/* If there's no initrd at all, we're done */
+	if (! initrd_size)
+		return (struct addr_range){0, 0};
 
 	/*
-	 * Now find the initrd
-	 *
-	 * First see if we have an image attached to us.  If so
-	 * allocate memory for it and copy it there.
+	 * If the initrd is too low it will be clobbered when the
+	 * kernel relocates to its final location.  In this case,
+	 * allocate a safer place and move it.
 	 */
-	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
-	initrd.memsize = initrd.size;
-	if (initrd.size > 0) {
+	if (initrd_addr < vmlinux.size) {
+		void *old_addr = (void *)initrd_addr;
+
 		printf("Allocating 0x%lx bytes for initrd ...\n\r",
-		       initrd.size);
-		initrd.addr = (unsigned long)malloc((u32)initrd.size);
-		if (initrd.addr == 0) {
-			printf("Can't allocate memory for initial "
-					"ramdisk !\n\r");
-			exit();
-		}
-		printf("initial ramdisk moving 0x%lx <- 0x%lx "
-			"(0x%lx bytes)\n\r", initrd.addr,
-			(unsigned long)_initrd_start, initrd.size);
-		memmove((void *)initrd.addr, (void *)_initrd_start,
-			initrd.size);
-		printf("initrd head: 0x%lx\n\r",
-				*((unsigned long *)initrd.addr));
-	} else if (a2 != 0) {
-		/* Otherwise, see if yaboot or another loader gave us an initrd */
-		initrd.addr = a1;
-		initrd.memsize = initrd.size = a2;
-		printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
-		       initrd.addr, initrd.size);
+		       initrd_size);
+		initrd_addr = (unsigned long)malloc(initrd_size);
+		if (! initrd_addr)
+			fatal("Can't allocate memory for initial "
+			       "ramdisk !\n\r");
+		printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
+		       initrd_addr, old_addr, initrd_size);
+		memmove((void *)initrd_addr, old_addr, initrd_size);
 	}
 
-	/* Eventually gunzip the kernel */
-	if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
-		printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
-		       vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
-		len = vmlinuz.size;
-		gunzip((void *)vmlinux.addr, vmlinux.memsize,
-			(unsigned char *)vmlinuz.addr, &len);
-		printf("done 0x%lx bytes\n\r", len);
-	} else {
-		memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,
-			vmlinuz.size);
-	}
+	printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
 
-	/* Skip over the ELF header */
-#ifdef DEBUG
-	printf("... skipping 0x%lx bytes of ELF header\n\r",
-			elfoffset);
-#endif
-	vmlinux.addr += elfoffset;
+	/* Tell the kernel initrd address via device tree */
+	setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
+	setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
 
-	flush_cache((void *)vmlinux.addr, vmlinux.size);
+	return (struct addr_range){(void *)initrd_addr, initrd_size};
 }
 
 /* A buffer that may be edited by tools operating on a zImage binary so as to
  * edit the command line passed to vmlinux (by setting /chosen/bootargs).
  * The buffer is put in it's own section so that tools may locate it easier.
  */
-static char builtin_cmdline[COMMAND_LINE_SIZE]
+static char cmdline[COMMAND_LINE_SIZE]
 	__attribute__((__section__("__builtin_cmdline")));
 
-static void get_cmdline(char *buf, int size)
+static void prep_cmdline(void *chosen)
 {
-	void *devp;
-	int len = strlen(builtin_cmdline);
-
-	buf[0] = '\0';
-
-	if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */
-		len = min(len, size-1);
-		strncpy(buf, builtin_cmdline, len);
-		buf[len] = '\0';
-	}
-	else if ((devp = finddevice("/chosen")))
-		getprop(devp, "bootargs", buf, size);
-}
+	if (cmdline[0] == '\0')
+		getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1);
 
-static void set_cmdline(char *buf)
-{
-	void *devp;
+	printf("\n\rLinux/PowerPC load: %s", cmdline);
+	/* If possible, edit the command line */
+	if (console_ops.edit_cmdline)
+		console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
+	printf("\n\r");
 
-	if ((devp = finddevice("/chosen")))
-		setprop(devp, "bootargs", buf, strlen(buf) + 1);
+	/* Put the command line back into the devtree for the kernel */
+	setprop_str(chosen, "bootargs", cmdline);
 }
 
 struct platform_ops platform_ops;
 struct dt_ops dt_ops;
 struct console_ops console_ops;
+struct loader_info loader_info;
 
-void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
+void start(void)
 {
+	struct addr_range vmlinux, initrd;
 	kernel_entry_t kentry;
-	char cmdline[COMMAND_LINE_SIZE];
 	unsigned long ft_addr = 0;
+	void *chosen;
 
-	memset(__bss_start, 0, _end - __bss_start);
-	memset(&platform_ops, 0, sizeof(platform_ops));
-	memset(&dt_ops, 0, sizeof(dt_ops));
-	memset(&console_ops, 0, sizeof(console_ops));
+	/* Do this first, because malloc() could clobber the loader's
+	 * command line.  Only use the loader command line if a
+	 * built-in command line wasn't set by an external tool */
+	if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
+		memmove(cmdline, loader_info.cmdline,
+			min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1));
 
-	if (platform_init(promptr, _dtb_start, _dtb_end))
-		exit();
 	if (console_ops.open && (console_ops.open() < 0))
 		exit();
 	if (platform_ops.fixups)
 		platform_ops.fixups();
 
 	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
-	       _start, sp);
+	       _start, get_sp());
 
-	prep_kernel(a1, a2);
+	/* Ensure that the device tree has a /chosen node */
+	chosen = finddevice("/chosen");
+	if (!chosen)
+		chosen = create_node(NULL, "chosen");
 
-	/* If cmdline came from zimage wrapper or if we can edit the one
-	 * in the dt, print it out and edit it, if possible.
-	 */
-	if ((strlen(builtin_cmdline) > 0) || console_ops.edit_cmdline) {
-		get_cmdline(cmdline, COMMAND_LINE_SIZE);
-		printf("\n\rLinux/PowerPC load: %s", cmdline);
-		if (console_ops.edit_cmdline)
-			console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
-		printf("\n\r");
-		set_cmdline(cmdline);
-	}
+	vmlinux = prep_kernel();
+	initrd = prep_initrd(vmlinux, chosen,
+			     loader_info.initrd_addr, loader_info.initrd_size);
+	prep_cmdline(chosen);
 
 	printf("Finalizing device tree...");
 	if (dt_ops.finalize)
@@ -335,7 +203,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 	if (ft_addr)
 		printf(" flat tree at 0x%lx\n\r", ft_addr);
 	else
-		printf(" using OF tree (promptr=%p)\n\r", promptr);
+		printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
 
 	if (console_ops.close)
 		console_ops.close();
@@ -344,10 +212,9 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 	if (ft_addr)
 		kentry(ft_addr, 0, NULL);
 	else
-		/* XXX initrd addr/size should be passed in properties */
-		kentry(initrd.addr, initrd.size, promptr);
+		kentry((unsigned long)initrd.addr, initrd.size,
+		       loader_info.promptr);
 
-	/* console closed so printf below may not work */
-	printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");
-	exit();
+	/* console closed so printf in fatal below may not work */
+	fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
 }