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- #include "etherboot.h"
- #include "elf.h"
- #include "memsizes.h"
-
-
- #define NAME "Etherboot"
-
- #if defined(PCBIOS)
- #define FIRMWARE "PCBIOS"
- #endif
- #if defined(LINUXBIOS)
- #define FIRMWARE "LinuxBIOS"
- #endif
- #if !defined(FIRMWARE)
- #error "No BIOS selected"
- #endif
-
- #define SZ(X) ((sizeof(X)+3) & ~3)
- #define CP(D,S) (memcpy(&(D), &(S), sizeof(S)))
-
- struct elf_notes {
- /* The note header */
- struct Elf_Bhdr hdr;
-
- /* First the Fixed sized entries that must be well aligned */
-
- /* Pointer to bootp data */
- Elf_Nhdr nf1;
- char nf1_name[SZ(EB_PARAM_NOTE)];
- uint32_t nf1_bootp_data;
-
- /* Pointer to ELF header */
- Elf_Nhdr nf2;
- char nf2_name[SZ(EB_PARAM_NOTE)];
- uint32_t nf2_header;
-
- /* A copy of the i386 memory map */
- Elf_Nhdr nf3;
- char nf3_name[SZ(EB_PARAM_NOTE)];
- struct meminfo nf3_meminfo;
-
- /* Then the variable sized data string data where alignment does not matter */
-
- /* The bootloader name */
- Elf_Nhdr nv1;
- char nv1_desc[SZ(NAME)];
- /* The bootloader version */
- Elf_Nhdr nv2;
- char nv2_desc[SZ(VERSION)];
- /* The firmware type */
- Elf_Nhdr nv3;
- char nv3_desc[SZ(FIRMWARE)];
- /* Name of the loaded image */
- Elf_Nhdr nv4;
- char nv4_loaded_image[128];
- /* An empty command line */
- Elf_Nhdr nv5;
- char nv5_cmdline[SZ("")];
- };
-
- #define ELF_NOTE_COUNT (3 + 5)
-
- static struct elf_notes notes;
- struct Elf_Bhdr *prepare_boot_params(void *header)
- {
- memset(¬es, 0, sizeof(notes));
- notes.hdr.b_signature = ELF_BHDR_MAGIC;
- notes.hdr.b_size = sizeof(notes);
- notes.hdr.b_checksum = 0;
- notes.hdr.b_records = ELF_NOTE_COUNT;
-
- /* Initialize the fixed length entries. */
- notes.nf1.n_namesz = sizeof(EB_PARAM_NOTE);
- notes.nf1.n_descsz = sizeof(notes.nf1_bootp_data);
- notes.nf1.n_type = EB_BOOTP_DATA;
- CP(notes.nf1_name, EB_PARAM_NOTE);
- notes.nf1_bootp_data = virt_to_phys(BOOTP_DATA_ADDR);
-
- notes.nf2.n_namesz = sizeof(EB_PARAM_NOTE);
- notes.nf2.n_descsz = sizeof(notes.nf2_header);
- notes.nf2.n_type = EB_HEADER;
- CP(notes.nf2_name, EB_PARAM_NOTE);
- notes.nf2_header = virt_to_phys(header);
-
- notes.nf3.n_namesz = sizeof(EB_PARAM_NOTE);
- notes.nf3.n_descsz = sizeof(notes.nf3_meminfo);
- notes.nf3.n_type = EB_I386_MEMMAP;
- CP(notes.nf3_name, EB_PARAM_NOTE);
- memcpy(¬es.nf3_meminfo, &meminfo, sizeof(meminfo));
-
- /* Initialize the variable length entries */
- notes.nv1.n_namesz = 0;
- notes.nv1.n_descsz = sizeof(NAME);
- notes.nv1.n_type = EBN_BOOTLOADER_NAME;
- CP(notes.nv1_desc, NAME);
-
- notes.nv2.n_namesz = 0;
- notes.nv2.n_descsz = sizeof(VERSION);
- notes.nv2.n_type = EBN_BOOTLOADER_VERSION;
- CP(notes.nv2_desc, VERSION);
-
- notes.nv3.n_namesz = 0;
- notes.nv3.n_descsz = sizeof(FIRMWARE);
- notes.nv3.n_type = EBN_FIRMWARE_TYPE;
- CP(notes.nv3_desc, FIRMWARE);
-
- /* Attempt to pass the name of the loaded image */
- notes.nv4.n_namesz = 0;
- notes.nv4.n_descsz = sizeof(notes.nv4_loaded_image);
- notes.nv4.n_type = EBN_LOADED_IMAGE;
- memcpy(¬es.nv4_loaded_image, KERNEL_BUF, sizeof(notes.nv4_loaded_image));
-
- /* Pass an empty command line for now */
- notes.nv5.n_namesz = 0;
- notes.nv5.n_descsz = sizeof("");
- notes.nv5.n_type = EBN_COMMAND_LINE;
- CP(notes.nv5_cmdline, "");
-
-
- notes.hdr.b_checksum = ipchksum(¬es, sizeof(notes));
- /* Like UDP invert a 0 checksum to show that a checksum is present */
- if (notes.hdr.b_checksum == 0) {
- notes.hdr.b_checksum = 0xffff;
- }
- return ¬es.hdr;
- }
-
- int elf_start(unsigned long machine __unused_i386, unsigned long entry, unsigned long params)
- {
- #if defined(CONFIG_X86_64)
- if (machine == EM_X86_64) {
- return xstart_lm(entry, params);
- }
- #endif
- return xstart32(entry, params);
- }
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