Obsoleted by arch/i386/image/multiboot.c

src/arch/i386/core/multiboot_loader.c

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