2 * arch/ia64/hp/sim/boot/bootloader.c
6 * Copyright (C) 1998-2003 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Stephane Eranian <eranian@hpl.hp.com>
10 * 01/07/99 S.Eranian modified to pass command line arguments to kernel
12 struct task_struct; /* forward declaration for elf.h */
14 #include <linux/config.h>
15 #include <linux/elf.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
20 #include <asm/intrinsics.h>
22 #include <asm/pgtable.h>
24 #include <asm/system.h>
38 extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry);
39 extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen);
40 extern void debug_break (void);
43 cons_write (const char *buf)
47 while ((ch = *buf++) != '\0') {
48 ssc(ch, 0, 0, 0, SSC_PUTCHAR);
50 ssc('\r', 0, 0, 0, SSC_PUTCHAR);
57 start_bootloader (void)
59 static char mem[4096];
60 static char buffer[1024];
64 struct disk_stat stat;
66 struct elf_phdr *elf_phdr; /* program header */
67 unsigned long e_entry, e_phoff, e_phnum;
68 register struct ia64_boot_param *bp;
72 ssc(0, 0, 0, 0, SSC_CONSOLE_INIT);
75 * S.Eranian: extract the commandline argument from the simulator
77 * The expected format is as follows:
81 * Both are optional but you can't have the second one without the first.
83 arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS);
89 while (*args != ' ' && *args != '\0')
92 *args++ = '\0', --arglen;
100 fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN);
104 cons_write(": file not found, reboot now\n");
110 req.len = sizeof(mem);
111 req.addr = (long) mem;
112 ssc(fd, 1, (long) &req, off, SSC_READ);
113 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
115 elf = (struct elfhdr *) mem;
116 if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) != 0) {
117 cons_write("not an ELF file\n");
120 if (elf->e_type != ET_EXEC) {
121 cons_write("not an ELF executable\n");
124 if (!elf_check_arch(elf)) {
125 cons_write("kernel not for this processor\n");
129 e_entry = elf->e_entry;
130 e_phnum = elf->e_phnum;
131 e_phoff = elf->e_phoff;
133 cons_write("loading ");
137 for (i = 0; i < e_phnum; ++i) {
138 req.len = sizeof(*elf_phdr);
139 req.addr = (long) mem;
140 ssc(fd, 1, (long) &req, e_phoff, SSC_READ);
141 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
142 if (stat.count != sizeof(*elf_phdr)) {
143 cons_write("failed to read phdr\n");
146 e_phoff += sizeof(*elf_phdr);
148 elf_phdr = (struct elf_phdr *) mem;
150 if (elf_phdr->p_type != PT_LOAD)
153 req.len = elf_phdr->p_filesz;
154 req.addr = __pa(elf_phdr->p_paddr);
155 ssc(fd, 1, (long) &req, elf_phdr->p_offset, SSC_READ);
156 ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
157 memset((char *)__pa(elf_phdr->p_paddr) + elf_phdr->p_filesz, 0,
158 elf_phdr->p_memsz - elf_phdr->p_filesz);
160 ssc(fd, 0, 0, 0, SSC_CLOSE);
162 cons_write("starting kernel...\n");
164 /* fake an I/O base address: */
165 ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL);
167 bp = sys_fw_init(args, arglen);
169 ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS);
172 jmp_to_kernel((unsigned long) bp, e_entry);
174 cons_write("kernel returned!\n");
175 ssc(-1, 0, 0, 0, SSC_EXIT);