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/*
* arch/ia64/boot/bootloader.c
*
* Loads an ELF kernel.
*
* Copyright (C) 1998-2002 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/pal.h>
#include <asm/pgtable.h>
#include <asm/sal.h>
#include <asm/system.h>
/* Simulator system calls: */
#define SSC_CONSOLE_INIT 20
#define SSC_GETCHAR 21
#define SSC_PUTCHAR 31
#define SSC_OPEN 50
#define SSC_CLOSE 51
#define SSC_READ 52
#define SSC_WRITE 53
#define SSC_GET_COMPLETION 54
#define SSC_WAIT_COMPLETION 55
#define SSC_CONNECT_INTERRUPT 58
#define SSC_GENERATE_INTERRUPT 59
#define SSC_SET_PERIODIC_INTERRUPT 60
#define SSC_GET_RTC 65
#define SSC_EXIT 66
#define SSC_LOAD_SYMBOLS 69
#define SSC_GET_TOD 74
#define SSC_GET_ARGS 75
struct disk_req {
unsigned long addr;
unsigned len;
};
struct disk_stat {
int fd;
unsigned count;
};
#include "../kernel/fw-emu.c"
/*
* Set a break point on this function so that symbols are available to set breakpoints in
* the kernel being debugged.
*/
static 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 (void)
{
static char stack[16384] __attribute__ ((aligned (16)));
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;
asm volatile ("movl gp=__gp;;" ::: "memory");
asm volatile ("mov sp=%0" :: "r"(stack) : "memory");
asm volatile ("bsw.1;;");
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: */
asm volatile ("mov ar.k0=%0" :: "r"(0xffffc000000UL));
bp = sys_fw_init(args, arglen);
ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS);
debug_break();
asm volatile ("mov sp=%2; mov r28=%1; br.sptk.few %0"
:: "b"(e_entry), "r"(bp), "r"(__pa(&stack)));
cons_write("kernel returned!\n");
ssc(-1, 0, 0, 0, SSC_EXIT);
}
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