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/elf.h>
15
#include <linux/init.h>
16
#include <linux/kernel.h>
19
#include <asm/intrinsics.h>
21
#include <asm/pgtable.h>
23
#include <asm/system.h>
37
extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry);
38
extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen);
39
extern void debug_break (void);
42
cons_write (const char *buf)
46
while ((ch = *buf++) != '\0') {
47
ssc(ch, 0, 0, 0, SSC_PUTCHAR);
49
ssc('\r', 0, 0, 0, SSC_PUTCHAR);
56
start_bootloader (void)
58
static char mem[4096];
59
static char buffer[1024];
63
struct disk_stat stat;
65
struct elf_phdr *elf_phdr; /* program header */
66
unsigned long e_entry, e_phoff, e_phnum;
67
register struct ia64_boot_param *bp;
71
ssc(0, 0, 0, 0, SSC_CONSOLE_INIT);
74
* S.Eranian: extract the commandline argument from the simulator
76
* The expected format is as follows:
80
* Both are optional but you can't have the second one without the first.
82
arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS);
88
while (*args != ' ' && *args != '\0')
91
*args++ = '\0', --arglen;
99
fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN);
103
cons_write(": file not found, reboot now\n");
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);
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");
119
if (elf->e_type != ET_EXEC) {
120
cons_write("not an ELF executable\n");
123
if (!elf_check_arch(elf)) {
124
cons_write("kernel not for this processor\n");
128
e_entry = elf->e_entry;
129
e_phnum = elf->e_phnum;
130
e_phoff = elf->e_phoff;
132
cons_write("loading ");
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");
145
e_phoff += sizeof(*elf_phdr);
147
elf_phdr = (struct elf_phdr *) mem;
149
if (elf_phdr->p_type != PT_LOAD)
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);
159
ssc(fd, 0, 0, 0, SSC_CLOSE);
161
cons_write("starting kernel...\n");
163
/* fake an I/O base address: */
164
ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL);
166
bp = sys_fw_init(args, arglen);
168
ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS);
171
jmp_to_kernel((unsigned long) bp, e_entry);
173
cons_write("kernel returned!\n");
174
ssc(-1, 0, 0, 0, SSC_EXIT);