On Thu, Nov 28, 2013 at 07:35:14PM +0800, Baoquan He wrote:
[..]
> > +void *bzImage64_load(struct kimage *image, char *kernel,
> > + unsigned long kernel_len,
> > + char *initrd, unsigned long initrd_len,
> > + char *cmdline, unsigned long cmdline_len)
> > +{
> > +
> > + struct setup_header *header;
> > + int setup_sects, kern16_size_needed, kern16_size, ret = 0;
> > + unsigned long setup_size, setup_header_size;
> > + struct boot_params *params;
> > + unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
> > + unsigned long kernel_bufsz, kernel_memsz, kernel_align;
> > + char *kernel_buf;
> > + struct bzimage64_data *ldata;
> > +
> > + header = (struct setup_header *)(kernel + 0x1F1);
> > + setup_sects = header->setup_sects;
> > + if (setup_sects == 0)
> > + setup_sects = 4;
> > +
> > + kern16_size = (setup_sects + 1) * 512;
> > + if (kernel_len < kern16_size) {
> > + pr_debug("bzImage truncated\n");
> > + return ERR_PTR(-ENOEXEC);
> > + }
> > +
> > + if (cmdline_len > header->cmdline_size) {
> > + pr_debug("Kernel command line too long\n");
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + /* Allocate loader specific data */
> > + ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
> > + if (!ldata)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + /* Argument/parameter segment */
> > + kern16_size_needed = kern16_size;
> > + if (kern16_size_needed < 4096)
> > + kern16_size_needed = 4096;
> > +
> > + setup_size = kern16_size_needed + cmdline_len;
> > + params = kzalloc(setup_size, GFP_KERNEL);
> > + if (!params) {
> > + ret = -ENOMEM;
> > + goto out_free_loader_data;
> > + }
> > +
> > + /* Copy setup header onto bootparams. */
> > + setup_header_size = 0x0202 + kernel[0x0201] - 0x1F1;
> > +
> > + /* Is there a limit on setup header size? */
> > + memcpy(¶ms->hdr, (kernel + 0x1F1), setup_header_size);
> > + ret = kexec_add_buffer(image, (char *)params, setup_size,
> > + setup_size, 16, 0x3000, -1, 1, &bootparam_load_addr);
> > + if (ret)
> > + goto out_free_params;
> > + pr_debug("Loaded boot_param and command line at 0x%lx\n",
> > + bootparam_load_addr);
> > +
> > + /* Load kernel */
> > + kernel_buf = kernel + kern16_size;
> > + kernel_bufsz = kernel_len - kern16_size;
> > + kernel_memsz = ALIGN(header->init_size, 4096);
> > + kernel_align = header->kernel_alignment;
> > +
> > + ret = kexec_add_buffer(image, kernel_buf,
> > + kernel_bufsz, kernel_memsz, kernel_align, 0x100000,
> > + -1, 1, &kernel_load_addr);
> > + if (ret)
> > + goto out_free_params;
> > +
> > + pr_debug("Loaded 64bit kernel at 0x%lx sz = 0x%lx\n", kernel_load_addr,
> > + kernel_memsz);
> > +
> > + /* Load initrd high */
> > + if (initrd) {
> > + ret = kexec_add_buffer(image, initrd, initrd_len, initrd_len,
> > + 4096, 0x10000000, ULONG_MAX, 1, &initrd_load_addr);
>
> Here the minimal starting addr to locate initrd is 256M, though it's
> allocated from top to down, I am still wondering why.
Hi Bao,
Good catch. It is vestige of some hard coding I had done initially to
test my patches. Forgot to remove the hardcoding here. Will fix it in
next version.
Thanks
Vivek
