diff options
Diffstat (limited to 'arch/ia64/hp/sim/boot/bootloader.c')
| -rw-r--r-- | arch/ia64/hp/sim/boot/bootloader.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/ia64/hp/sim/boot/bootloader.c b/arch/ia64/hp/sim/boot/bootloader.c new file mode 100644 index 00000000000..51a7b7b4dd0 --- /dev/null +++ b/arch/ia64/hp/sim/boot/bootloader.c @@ -0,0 +1,176 @@ +/* + * 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/config.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); +} |