[POWERPC] zImage: Cleanup and improve prep_kernel()
This patch rewrites prep_kernel() in the zImage wrapper code to be clearer and more flexible. Notable changes: - Handling of the initrd image from prep_kernel() has moved into a new prep_initrd() function. - The address of the initrd image is now added as device tree properties, as the kernel expects. - We only copy a packaged initrd image to a new location if it is in danger of being clobbered when the kernel moves to its final location, instead of always. - By default we decompress the kernel directly to address 0, instead of requiring it to relocate itself. Platforms (such as OF) where doing this could clobber still-live firmware data structures can override the vmlinux_alloc hook to provide an alternate place to decompress the kernel. - We no longer pass lots of information between functions in global variables. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -33,24 +33,21 @@ extern char _dtb_end[];
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static struct gunzip_state gzstate;
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struct addr_range {
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unsigned long addr;
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void *addr;
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unsigned long size;
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unsigned long memsize;
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};
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static struct addr_range vmlinux;
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static struct addr_range vmlinuz;
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static struct addr_range initrd;
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static unsigned long elfoffset;
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static int is_64bit;
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static char elfheader[256];
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struct elf_info {
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unsigned long loadsize;
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unsigned long memsize;
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unsigned long elfoffset;
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};
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typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);
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#undef DEBUG
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static int is_elf64(void *hdr)
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static int parse_elf64(void *hdr, struct elf_info *info)
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{
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Elf64_Ehdr *elf64 = hdr;
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Elf64_Phdr *elf64ph;
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@ -74,15 +71,14 @@ static int is_elf64(void *hdr)
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if (i >= (unsigned int)elf64->e_phnum)
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return 0;
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elfoffset = (unsigned long)elf64ph->p_offset;
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vmlinux.size = (unsigned long)elf64ph->p_filesz;
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vmlinux.memsize = (unsigned long)elf64ph->p_memsz;
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info->loadsize = (unsigned long)elf64ph->p_filesz;
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info->memsize = (unsigned long)elf64ph->p_memsz;
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info->elfoffset = (unsigned long)elf64ph->p_offset;
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is_64bit = 1;
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return 1;
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}
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static int is_elf32(void *hdr)
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static int parse_elf32(void *hdr, struct elf_info *info)
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{
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Elf32_Ehdr *elf32 = hdr;
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Elf32_Phdr *elf32ph;
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@ -98,7 +94,6 @@ static int is_elf32(void *hdr)
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elf32->e_machine == EM_PPC))
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return 0;
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elf32 = (Elf32_Ehdr *)elfheader;
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elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
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for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
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if (elf32ph->p_type == PT_LOAD)
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@ -106,24 +101,26 @@ static int is_elf32(void *hdr)
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if (i >= elf32->e_phnum)
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return 0;
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elfoffset = elf32ph->p_offset;
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vmlinux.size = elf32ph->p_filesz;
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vmlinux.memsize = elf32ph->p_memsz;
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info->loadsize = elf32ph->p_filesz;
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info->memsize = elf32ph->p_memsz;
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info->elfoffset = elf32ph->p_offset;
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return 1;
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}
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static void prep_kernel(unsigned long a1, unsigned long a2)
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static struct addr_range prep_kernel(void)
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{
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char elfheader[256];
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void *vmlinuz_addr = _vmlinux_start;
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unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
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void *addr = 0;
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struct elf_info ei;
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int len;
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vmlinuz.addr = (unsigned long)_vmlinux_start;
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vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
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/* gunzip the ELF header of the kernel */
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gunzip_start(&gzstate, (void *)vmlinuz.addr, vmlinuz.size);
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gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);
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gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));
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if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
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if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei)) {
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printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
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exit();
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}
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@ -135,55 +132,92 @@ static void prep_kernel(unsigned long a1, unsigned long a2)
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* the kernel bss must be claimed (it will be zero'd by the
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* kernel itself)
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*/
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printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
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vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
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if (vmlinux.addr == 0) {
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printf("Can't allocate memory for kernel image !\n\r");
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printf("Allocating 0x%lx bytes for kernel ...\n\r", ei.memsize);
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if (platform_ops.vmlinux_alloc) {
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addr = platform_ops.vmlinux_alloc(ei.memsize);
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} else {
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if ((unsigned long)_start < ei.memsize) {
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printf("Insufficient memory for kernel at address 0!"
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" (_start=%lx)\n\r", _start);
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exit();
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}
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}
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/* Finally, gunzip the kernel */
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printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,
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vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
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/* discard up to the actual load data */
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gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));
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len = gunzip_finish(&gzstate, addr, ei.memsize);
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printf("done 0x%lx bytes\n\r", len);
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flush_cache(addr, ei.loadsize);
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return (struct addr_range){addr, ei.memsize};
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}
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static struct addr_range prep_initrd(struct addr_range vmlinux,
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unsigned long initrd_addr,
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unsigned long initrd_size)
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{
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void *devp;
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u32 initrd_start, initrd_end;
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/* If we have an image attached to us, it overrides anything
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* supplied by the loader. */
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if (_initrd_end > _initrd_start) {
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printf("Attached initrd image at 0x%p-0x%p\n\r",
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_initrd_start, _initrd_end);
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initrd_addr = (unsigned long)_initrd_start;
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initrd_size = _initrd_end - _initrd_start;
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} else if (initrd_size > 0) {
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printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
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initrd_addr, initrd_addr + initrd_size);
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}
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/* If there's no initrd at all, we're done */
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if (! initrd_size)
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return (struct addr_range){0, 0};
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/*
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* If the initrd is too low it will be clobbered when the
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* kernel relocates to its final location. In this case,
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* allocate a safer place and move it.
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*/
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if (initrd_addr < vmlinux.size) {
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void *old_addr = (void *)initrd_addr;
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printf("Allocating 0x%lx bytes for initrd ...\n\r",
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initrd_size);
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initrd_addr = (unsigned long)malloc(initrd_size);
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if (! initrd_addr) {
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printf("Can't allocate memory for initial "
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"ramdisk !\n\r");
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exit();
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}
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printf("Relocating initrd 0x%p <- 0x%p (0x%lx bytes)\n\r",
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initrd_addr, old_addr, initrd_size);
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memmove((void *)initrd_addr, old_addr, initrd_size);
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}
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printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
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/* Tell the kernel initrd address via device tree */
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devp = finddevice("/chosen");
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if (! devp) {
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printf("Device tree has no chosen node!\n\r");
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exit();
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}
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/*
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* Now find the initrd
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*
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* First see if we have an image attached to us. If so
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* allocate memory for it and copy it there.
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*/
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initrd.size = (unsigned long)(_initrd_end - _initrd_start);
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initrd.memsize = initrd.size;
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if (initrd.size > 0) {
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printf("Allocating 0x%lx bytes for initrd ...\n\r",
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initrd.size);
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initrd.addr = (unsigned long)malloc((u32)initrd.size);
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if (initrd.addr == 0) {
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printf("Can't allocate memory for initial "
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"ramdisk !\n\r");
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exit();
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}
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printf("initial ramdisk moving 0x%lx <- 0x%lx "
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"(0x%lx bytes)\n\r", initrd.addr,
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(unsigned long)_initrd_start, initrd.size);
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memmove((void *)initrd.addr, (void *)_initrd_start,
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initrd.size);
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printf("initrd head: 0x%lx\n\r",
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*((unsigned long *)initrd.addr));
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} else if (a2 != 0) {
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/* Otherwise, see if yaboot or another loader gave us an initrd */
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initrd.addr = a1;
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initrd.memsize = initrd.size = a2;
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printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
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initrd.addr, initrd.size);
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}
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initrd_start = (u32)initrd_addr;
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initrd_end = (u32)initrd_addr + initrd_size;
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/* Eventually gunzip the kernel */
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printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
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vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
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/* discard up to the actual load data */
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gunzip_discard(&gzstate, elfoffset - sizeof(elfheader));
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len = gunzip_finish(&gzstate, (void *)vmlinux.addr,
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vmlinux.memsize);
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printf("done 0x%lx bytes\n\r", len);
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setprop(devp, "linux,initrd-start", &initrd_start,
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sizeof(initrd_start));
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setprop(devp, "linux,initrd-end", &initrd_end, sizeof(initrd_end));
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flush_cache((void *)vmlinux.addr, vmlinux.size);
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return (struct addr_range){(void *)initrd_addr, initrd_size};
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}
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/* A buffer that may be edited by tools operating on a zImage binary so as to
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@ -223,6 +257,7 @@ struct console_ops console_ops;
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void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
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{
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struct addr_range vmlinux, initrd;
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kernel_entry_t kentry;
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char cmdline[COMMAND_LINE_SIZE];
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unsigned long ft_addr = 0;
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printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
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_start, sp);
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prep_kernel(a1, a2);
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vmlinux = prep_kernel();
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initrd = prep_initrd(vmlinux, a1, a2);
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/* If cmdline came from zimage wrapper or if we can edit the one
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* in the dt, print it out and edit it, if possible.
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if (ft_addr)
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kentry(ft_addr, 0, NULL);
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else
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/* XXX initrd addr/size should be passed in properties */
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kentry(initrd.addr, initrd.size, promptr);
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kentry((unsigned long)initrd.addr, initrd.size, promptr);
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/* console closed so printf below may not work */
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printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");
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@ -208,6 +208,17 @@ static void of_image_hdr(const void *hdr)
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}
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}
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static void *of_vmlinux_alloc(unsigned long size)
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{
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void *p = malloc(size);
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if (!p) {
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printf("Can't allocate memory for kernel image!\n\r");
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exit();
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}
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return p;
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}
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static void of_exit(void)
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{
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call_prom("exit", 0, 0);
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platform_ops.image_hdr = of_image_hdr;
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platform_ops.malloc = of_try_claim;
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platform_ops.exit = of_exit;
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platform_ops.vmlinux_alloc = of_vmlinux_alloc;
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dt_ops.finddevice = of_finddevice;
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dt_ops.getprop = of_getprop;
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@ -25,6 +25,7 @@ struct platform_ops {
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void (*free)(void *ptr);
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void * (*realloc)(void *ptr, unsigned long size);
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void (*exit)(void);
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void * (*vmlinux_alloc)(unsigned long size);
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};
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extern struct platform_ops platform_ops;
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