/* * arch/ia64/boot/bootloader.c * * Loads an ELF kernel. * * Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co * Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com> * Copyright (C) 1998, 1999 Stephane Eranian <eranian@hpl.hp.com> * * 01/07/99 S.Eranian modified to pass command line arguments to kernel */#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			75struct disk_req {	unsigned long addr;	unsigned len;};struct disk_stat {	int fd;	unsigned count;};#include "../kernel/fw-emu.c"static voidcons_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 32void_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_vaddr);		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_vaddr) + 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);	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);}