/* * arch/ia64/hp/sim/boot/bootloader.c * * Loads an ELF kernel. * * Copyright (C) 1998-2003 Hewlett-Packard Co * David Mosberger-Tang <davidm@hpl.hp.com> * Stephane Eranian <eranian@hpl.hp.com> * * 01/07/99 S.Eranian modified to pass command line arguments to kernel */ struct task_struct; /* forward declaration for elf.h */ #include <linux/elf.h> #include <linux/init.h> #include <linux/kernel.h> #include <asm/elf.h> #include <asm/intrinsics.h> #include <asm/pal.h> #include <asm/pgtable.h> #include <asm/sal.h> #include <asm/system.h> #include "ssc.h" struct disk_req { unsigned long addr; unsigned len; }; struct disk_stat { int fd; unsigned count; }; extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry); extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen); extern void debug_break (void); static void cons_write (const char *buf) { unsigned long ch; while ((ch = *buf++) != '\0') { ssc(ch, 0, 0, 0, SSC_PUTCHAR); if (ch == '\n') ssc('\r', 0, 0, 0, SSC_PUTCHAR); } } #define MAX_ARGS 32 void start_bootloader (void) { static char mem[4096]; static char buffer[1024]; unsigned long off; int fd, i; struct disk_req req; struct disk_stat stat; struct elfhdr *elf; struct elf_phdr *elf_phdr; /* program header */ unsigned long e_entry, e_phoff, e_phnum; register struct ia64_boot_param *bp; char *kpath, *args; long arglen = 0; ssc(0, 0, 0, 0, SSC_CONSOLE_INIT); /* * S.Eranian: extract the commandline argument from the simulator * * The expected format is as follows: * * kernelname args... * * Both are optional but you can't have the second one without the first. */ arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS); kpath = "vmlinux"; args = buffer; if (arglen > 0) { kpath = buffer; while (*args != ' ' && *args != '\0') ++args, --arglen; if (*args == ' ') *args++ = '\0', --arglen; } if (arglen <= 0) { args = ""; arglen = 1; } fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN); if (fd < 0) { cons_write(kpath); cons_write(": file not found, reboot now\n"); for(;;); } stat.fd = fd; off = 0; req.len = sizeof(mem); req.addr = (long) mem; ssc(fd, 1, (long) &req, off, SSC_READ); ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); elf = (struct elfhdr *) mem; if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) != 0) { cons_write("not an ELF file\n"); return; } if (elf->e_type != ET_EXEC) { cons_write("not an ELF executable\n"); return; } if (!elf_check_arch(elf)) { cons_write("kernel not for this processor\n"); return; } e_entry = elf->e_entry; e_phnum = elf->e_phnum; e_phoff = elf->e_phoff; cons_write("loading "); cons_write(kpath); cons_write("...\n"); for (i = 0; i < e_phnum; ++i) { req.len = sizeof(*elf_phdr); req.addr = (long) mem; ssc(fd, 1, (long) &req, e_phoff, SSC_READ); ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); if (stat.count != sizeof(*elf_phdr)) { cons_write("failed to read phdr\n"); return; } e_phoff += sizeof(*elf_phdr); elf_phdr = (struct elf_phdr *) mem; if (elf_phdr->p_type != PT_LOAD) continue; req.len = elf_phdr->p_filesz; req.addr = __pa(elf_phdr->p_paddr); ssc(fd, 1, (long) &req, elf_phdr->p_offset, SSC_READ); ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); memset((char *)__pa(elf_phdr->p_paddr) + elf_phdr->p_filesz, 0, elf_phdr->p_memsz - elf_phdr->p_filesz); } ssc(fd, 0, 0, 0, SSC_CLOSE); cons_write("starting kernel...\n"); /* fake an I/O base address: */ ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL); bp = sys_fw_init(args, arglen); ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS); debug_break(); jmp_to_kernel((unsigned long) bp, e_entry); cons_write("kernel returned!\n"); ssc(-1, 0, 0, 0, SSC_EXIT); }