openwrt/upstream - upstream openwrt

	Commit message (Expand)	Author	Age	Files	Lines
*	bpf-headers: add a package with kernel headers for ebpf	Felix Fietkau	2021-11-01	1	-0/+14

/* * Xen domain builder -- bzImage bits * * Parse and load bzImage kernel images. * * This relies on version 2.08 of the boot protocol, which contains an * ELF file embedded in the bzImage. The loader extracts this ELF * image and passes it off to the standard ELF loader. * * This code is licenced under the GPL. * written 2006 by Gerd Hoffmann <kraxel@suse.de>. * written 2007 by Jeremy Fitzhardinge <jeremy@xensource.com> * written 2008 by Ian Campbell <ijc@hellion.org.uk> * */ #include <stdio.h> #include <stdlib.h> #include <inttypes.h> #include "xg_private.h" #include "xc_dom.h" struct setup_header { uint8_t _pad0[0x1f1]; /* skip uninteresting stuff */ uint8_t setup_sects; uint16_t root_flags; uint32_t syssize; uint16_t ram_size; uint16_t vid_mode; uint16_t root_dev; uint16_t boot_flag; uint16_t jump; uint32_t header; #define HDR_MAGIC "HdrS" #define HDR_MAGIC_SZ 4 uint16_t version; #define VERSION(h,l) (((h)<<8) | (l)) uint32_t realmode_swtch; uint16_t start_sys; uint16_t kernel_version; uint8_t type_of_loader; uint8_t loadflags; uint16_t setup_move_size; uint32_t code32_start; uint32_t ramdisk_image; uint32_t ramdisk_size; uint32_t bootsect_kludge; uint16_t heap_end_ptr; uint16_t _pad1; uint32_t cmd_line_ptr; uint32_t initrd_addr_max; uint32_t kernel_alignment; uint8_t relocatable_kernel; uint8_t _pad2[3]; uint32_t cmdline_size; uint32_t hardware_subarch; uint64_t hardware_subarch_data; uint32_t payload_offset; uint32_t payload_length; } __attribute__((packed)); extern struct xc_dom_loader elf_loader; static unsigned int payload_offset(struct setup_header *hdr) { unsigned int off; off = (hdr->setup_sects + 1) * 512; off += hdr->payload_offset; return off; } static int check_bzimage_kernel(struct xc_dom_image *dom, int verbose) { struct setup_header *hdr; if ( dom->kernel_blob == NULL ) { if ( verbose ) xc_dom_panic(XC_INTERNAL_ERROR, "%s: no kernel image loaded\n", __FUNCTION__); return -EINVAL; } if ( dom->kernel_size < sizeof(struct setup_header) ) { if ( verbose ) xc_dom_panic(XC_INTERNAL_ERROR, "%s: kernel image too small\n", __FUNCTION__); return -EINVAL; } hdr = dom->kernel_blob; if ( memcmp(&hdr->header, HDR_MAGIC, HDR_MAGIC_SZ) != 0 ) { if ( verbose ) xc_dom_panic(XC_INVALID_KERNEL, "%s: kernel is not a bzImage\n", __FUNCTION__); return -EINVAL; } if ( hdr->version < VERSION(2,8) ) { if ( verbose ) xc_dom_panic(XC_INVALID_KERNEL, "%s: boot protocol too old (%04x)\n", __FUNCTION__, hdr->version); return -EINVAL; } dom->kernel_blob = dom->kernel_blob + payload_offset(hdr); dom->kernel_size = hdr->payload_length; if ( xc_dom_try_gunzip(dom, &dom->kernel_blob, &dom->kernel_size) == -1 ) { if ( verbose ) xc_dom_panic(XC_INVALID_KERNEL, "%s: unable to decompress kernel\n", __FUNCTION__); return -EINVAL; } return elf_loader.probe(dom); } static int xc_dom_probe_bzimage_kernel(struct xc_dom_image *dom) { return check_bzimage_kernel(dom, 0); } static int xc_dom_parse_bzimage_kernel(struct xc_dom_image *dom) { return elf_loader.parser(dom); } static int xc_dom_load_bzimage_kernel(struct xc_dom_image *dom) { return elf_loader.loader(dom); } static struct xc_dom_loader bzimage_loader = { .name = "Linux bzImage", .probe = xc_dom_probe_bzimage_kernel, .parser = xc_dom_parse_bzimage_kernel, .loader = xc_dom_load_bzimage_kernel, }; static void __init register_loader(void) { xc_dom_register_loader(&bzimage_loader); } /* * Local variables: * mode: C * c-set-style: "BSD" * c-basic-offset: 4 * tab-width: 4 * indent-tabs-mode: nil * End: */