mirror of https://github.com/ipxe/ipxe.git
Obsoleted by arch/i386/image/multiboot.c
Michael Brown
parent
784e10635a
commit
77d280968a
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/* Multiboot support
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*
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* 2003-07-02 mmap fix and header probe by SONE Takeshi
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*/
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struct multiboot_mods {
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unsigned mod_start;
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unsigned mod_end;
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unsigned char *string;
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unsigned reserved;
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};
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struct multiboot_mmap {
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unsigned int size;
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unsigned int base_addr_low;
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unsigned int base_addr_high;
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unsigned int length_low;
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unsigned int length_high;
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unsigned int type;
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};
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/* The structure of a Multiboot 0.6 parameter block. */
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struct multiboot_info {
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unsigned int flags;
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#define MULTIBOOT_MEM_VALID 0x01
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#define MULTIBOOT_BOOT_DEV_VALID 0x02
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#define MULTIBOOT_CMDLINE_VALID 0x04
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#define MULTIBOOT_MODS_VALID 0x08
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#define MULTIBOOT_AOUT_SYMS_VALID 0x10
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#define MULTIBOOT_ELF_SYMS_VALID 0x20
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#define MULTIBOOT_MMAP_VALID 0x40
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unsigned int memlower;
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unsigned int memupper;
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unsigned int bootdev;
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unsigned int cmdline; /* physical address of the command line */
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unsigned mods_count;
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struct multiboot_mods *mods_addr;
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unsigned syms_num;
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unsigned syms_size;
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unsigned syms_addr;
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unsigned syms_shndx;
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unsigned mmap_length;
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unsigned mmap_addr;
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/* The structure actually ends here, so I might as well put
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* the ugly e820 parameters here...
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*/
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struct multiboot_mmap mmap[E820MAX];
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};
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/* Multiboot image header (minimal part) */
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struct multiboot_header {
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unsigned int magic;
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#define MULTIBOOT_HEADER_MAGIC 0x1BADB002
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unsigned int flags;
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unsigned int checksum;
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};
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static struct multiboot_header *mbheader;
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static unsigned int mbimgoffset, mboffset;
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static unsigned char mbbuffer[12];
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static struct multiboot_info mbinfo;
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static void multiboot_init(void)
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{
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mbheader = NULL;
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mbimgoffset = 0;
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mboffset = 0;
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}
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/* Remember this probing function is actually different from the usual probing
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* functions, since the Multiboot header is somewhere in the first 8KB of the
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* image and it is byte aligned, but there is not much more known about how to
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* find it. In the Etherboot context the most complicated issue is that the
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* image has to be processed block-by-block, with unknown block size and no
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* guarantees about block alignment with respect to the image. */
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static void multiboot_peek(unsigned char *data, int len)
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{
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struct multiboot_header *h;
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/* If we have already searched the first 8KB of the image or if we have
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* already found a valid Multiboot header, skip this code. */
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if ((mboffset == 12) || (mbimgoffset >= 8192))
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return;
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if (mbimgoffset + len >= 8192)
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len = 8192 - mbimgoffset;
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/* This piece of code is pretty stupid, since it always copies data, even
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* if it is word aligned. This shouldn't matter too much on platforms that
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* use the Multiboot spec, since the processors are usually reasonably fast
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* and this code is only executed for the first 8KB of the image. Feel
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* free to improve it, but be prepared to write quite a lot of code that
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* deals with non-aligned data with respect to the image to load. */
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while (len > 0) {
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mbimgoffset++;
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memcpy(mbbuffer + mboffset, data, 1);
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mboffset++;
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data++;
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len--;
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if (mboffset == 4) {
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/* Accumulated a word into the buffer. */
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h = (struct multiboot_header *)mbbuffer;
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if (h->magic != MULTIBOOT_HEADER_MAGIC) {
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/* Wrong magic, this cannot be the start of the header. */
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mboffset = 0;
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}
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} else if (mboffset == 12) {
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/* Accumulated the minimum header data into the buffer. */
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h = (struct multiboot_header *)mbbuffer;
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if (h->magic + h->flags + h->checksum != 0) {
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/* Checksum error, not a valid header. Check for a possible
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* header starting in the current flag/checksum field. */
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if (h->flags == MULTIBOOT_HEADER_MAGIC) {
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mboffset -= 4;
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memmove(mbbuffer, mbbuffer + 4, mboffset);
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} else if (h->checksum == MULTIBOOT_HEADER_MAGIC) {
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mboffset -= 8;
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memmove(mbbuffer, mbbuffer + 8, mboffset);
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} else {
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mboffset = 0;
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}
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} else {
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printf("Multiboot... ");
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mbheader = h;
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if ((h->flags & 0xfffc) != 0) {
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printf("\nERROR: Unsupported Multiboot requirements flags\n");
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longjmp(restart_etherboot, -2);
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}
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break;
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}
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}
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}
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mbimgoffset += len;
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}
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static inline void multiboot_boot(unsigned long entry)
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{
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unsigned char cmdline[512], *c;
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int i;
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if (!mbheader)
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return;
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/* Etherboot limits the command line to the kernel name,
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* default parameters and user prompted parameters. All of
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* them are shorter than 256 bytes. As the kernel name and
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* the default parameters come from the same BOOTP/DHCP entry
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* (or if they don't, the parameters are empty), only two
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* strings of the maximum size are possible. Note this buffer
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* can overrun if a stupid file name is chosen. Oh well. */
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c = cmdline;
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for (i = 0; KERNEL_BUF[i] != '\0'; i++) {
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switch (KERNEL_BUF[i]) {
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case ' ':
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case '\\':
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case '"':
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*c++ = '\\';
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break;
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default:
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break;
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}
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*c++ = KERNEL_BUF[i];
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}
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if (addparam != NULL) {
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*c++ = ' ';
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memcpy(c, addparam, addparamlen);
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c += addparamlen;
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}
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(void)sprintf(c, " -retaddr %#lX", virt_to_phys(xend32));
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mbinfo.flags = MULTIBOOT_MMAP_VALID | MULTIBOOT_MEM_VALID |MULTIBOOT_CMDLINE_VALID;
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mbinfo.memlower = meminfo.basememsize;
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mbinfo.memupper = meminfo.memsize;
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mbinfo.bootdev = 0; /* not booted from disk */
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mbinfo.cmdline = virt_to_phys(cmdline);
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for (i = 0; i < (int) meminfo.map_count; i++) {
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mbinfo.mmap[i].size = sizeof(struct multiboot_mmap)
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- sizeof(unsigned int);
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mbinfo.mmap[i].base_addr_low =
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(unsigned int) meminfo.map[i].addr;
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mbinfo.mmap[i].base_addr_high =
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(unsigned int) (meminfo.map[i].addr >> 32);
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mbinfo.mmap[i].length_low =
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(unsigned int) meminfo.map[i].size;
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mbinfo.mmap[i].length_high =
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(unsigned int) (meminfo.map[i].size >> 32);
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mbinfo.mmap[i].type = meminfo.map[i].type;
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}
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mbinfo.mmap_length = meminfo.map_count * sizeof(struct multiboot_mmap);
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mbinfo.mmap_addr = virt_to_phys(mbinfo.mmap);
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/* The Multiboot 0.6 spec requires all segment registers to be
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* loaded with an unrestricted, writeable segment.
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* xstart32 does this for us.
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*/
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/* Start the kernel, passing the Multiboot information record
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* and the magic number. */
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os_regs.eax = 0x2BADB002;
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os_regs.ebx = virt_to_phys(&mbinfo);
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xstart32(entry);
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/* A Multiboot kernel by default never returns - there is nothing in the
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* specification about what happens to the boot loader after the kernel has
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* been started. Thus if the kernel returns it is definitely aware of the
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* semantics involved (i.e. the "-retaddr" parameter). Do not treat this
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* as an error, but restart with a fresh DHCP request in order to activate
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* the menu again in case one is used. */
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longjmp(restart_etherboot, 2);
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}
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