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