1/* 2 * arch/ia64/hp/sim/boot/bootloader.c 3 * 4 * Loads an ELF kernel. 5 * 6 * Copyright (C) 1998-2003 Hewlett-Packard Co 7 * David Mosberger-Tang <davidm@hpl.hp.com> 8 * Stephane Eranian <eranian@hpl.hp.com> 9 * 10 * 01/07/99 S.Eranian modified to pass command line arguments to kernel 11 */ 12struct task_struct; /* forward declaration for elf.h */ 13 14#include <linux/elf.h> 15#include <linux/init.h> 16#include <linux/kernel.h> 17 18#include <asm/elf.h> 19#include <asm/intrinsics.h> 20#include <asm/pal.h> 21#include <asm/pgtable.h> 22#include <asm/sal.h> 23#include <asm/system.h> 24 25#include "ssc.h" 26 27struct disk_req { 28 unsigned long addr; 29 unsigned len; 30}; 31 32struct disk_stat { 33 int fd; 34 unsigned count; 35}; 36 37extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry); 38extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen); 39extern void debug_break (void); 40 41static void 42cons_write (const char *buf) 43{ 44 unsigned long ch; 45 46 while ((ch = *buf++) != '\0') { 47 ssc(ch, 0, 0, 0, SSC_PUTCHAR); 48 if (ch == '\n') 49 ssc('\r', 0, 0, 0, SSC_PUTCHAR); 50 } 51} 52 53#define MAX_ARGS 32 54 55void 56start_bootloader (void) 57{ 58 static char mem[4096]; 59 static char buffer[1024]; 60 unsigned long off; 61 int fd, i; 62 struct disk_req req; 63 struct disk_stat stat; 64 struct elfhdr *elf; 65 struct elf_phdr *elf_phdr; /* program header */ 66 unsigned long e_entry, e_phoff, e_phnum; 67 register struct ia64_boot_param *bp; 68 char *kpath, *args; 69 long arglen = 0; 70 71 ssc(0, 0, 0, 0, SSC_CONSOLE_INIT); 72 73 /* 74 * S.Eranian: extract the commandline argument from the simulator 75 * 76 * The expected format is as follows: 77 * 78 * kernelname args... 79 * 80 * Both are optional but you can't have the second one without the first. 81 */ 82 arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS); 83 84 kpath = "vmlinux"; 85 args = buffer; 86 if (arglen > 0) { 87 kpath = buffer; 88 while (*args != ' ' && *args != '\0') 89 ++args, --arglen; 90 if (*args == ' ') 91 *args++ = '\0', --arglen; 92 } 93 94 if (arglen <= 0) { 95 args = ""; 96 arglen = 1; 97 } 98 99 fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN); 100 101 if (fd < 0) { 102 cons_write(kpath); 103 cons_write(": file not found, reboot now\n"); 104 for(;;); 105 } 106 stat.fd = fd; 107 off = 0; 108 109 req.len = sizeof(mem); 110 req.addr = (long) mem; 111 ssc(fd, 1, (long) &req, off, SSC_READ); 112 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); 113 114 elf = (struct elfhdr *) mem; 115 if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) != 0) { 116 cons_write("not an ELF file\n"); 117 return; 118 } 119 if (elf->e_type != ET_EXEC) { 120 cons_write("not an ELF executable\n"); 121 return; 122 } 123 if (!elf_check_arch(elf)) { 124 cons_write("kernel not for this processor\n"); 125 return; 126 } 127 128 e_entry = elf->e_entry; 129 e_phnum = elf->e_phnum; 130 e_phoff = elf->e_phoff; 131 132 cons_write("loading "); 133 cons_write(kpath); 134 cons_write("...\n"); 135 136 for (i = 0; i < e_phnum; ++i) { 137 req.len = sizeof(*elf_phdr); 138 req.addr = (long) mem; 139 ssc(fd, 1, (long) &req, e_phoff, SSC_READ); 140 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); 141 if (stat.count != sizeof(*elf_phdr)) { 142 cons_write("failed to read phdr\n"); 143 return; 144 } 145 e_phoff += sizeof(*elf_phdr); 146 147 elf_phdr = (struct elf_phdr *) mem; 148 149 if (elf_phdr->p_type != PT_LOAD) 150 continue; 151 152 req.len = elf_phdr->p_filesz; 153 req.addr = __pa(elf_phdr->p_paddr); 154 ssc(fd, 1, (long) &req, elf_phdr->p_offset, SSC_READ); 155 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); 156 memset((char *)__pa(elf_phdr->p_paddr) + elf_phdr->p_filesz, 0, 157 elf_phdr->p_memsz - elf_phdr->p_filesz); 158 } 159 ssc(fd, 0, 0, 0, SSC_CLOSE); 160 161 cons_write("starting kernel...\n"); 162 163 /* fake an I/O base address: */ 164 ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL); 165 166 bp = sys_fw_init(args, arglen); 167 168 ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS); 169 170 debug_break(); 171 jmp_to_kernel((unsigned long) bp, e_entry); 172 173 cons_write("kernel returned!\n"); 174 ssc(-1, 0, 0, 0, SSC_EXIT); 175} 176