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/* $OpenBSD: zbsdmod.c,v 1.6 2005/03/29 19:44:12 uwe Exp $ */
/*
* Copyright (c) 2005 Uwe Stuehler <uwe@bsdx.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Zaurus OpenBSD bootstrap loader.
*/
#include "compat_linux.h"
#define BOOTARGS_BUFSIZ 256
#define BOOTARGS_MAGIC 0x4f425344
#define ZBOOTDEV_MAJOR 99
#define ZBOOTDEV_MODE 0222
#define ZBOOTDEV_NAME "zboot"
#define ZBOOTMOD_NAME "zbsdmod"
/* Prototypes */
void elf32bsdboot(void);
int init_module(void);
void cleanup_module(void);
ssize_t zbsdmod_write(struct file *, const char *, size_t, loff_t *);
int zbsdmod_open(struct inode *, struct file *);
int zbsdmod_close(struct inode *, struct file *);
static struct file_operations fops = {
0, /* struct module *owner */
0, /* lseek */
0, /* read */
zbsdmod_write, /* write */
0, /* readdir */
0, /* poll */
0, /* ioctl */
0, /* mmap */
zbsdmod_open, /* open */
0, /* flush */
zbsdmod_close, /* release */
0, /* sync */
0, /* async */
0, /* check media change */
0, /* revalidate */
0, /* lock */
};
static int isopen;
static loff_t position;
/* Outcast local variables to avoid stack usage in elf32bsdboot(). */
static unsigned int sz;
static int i;
static vaddr_t minv;
static int *addr;
/* The maximum size of a kernel image is restricted to 5MB. */
static int bsdimage[1310720]; /* XXX use kmalloc() */
static char bootargs[BOOTARGS_BUFSIZ];
/*
* Boot the loaded BSD kernel image, or return if an error is found.
* Part of this routine is borrowed from sys/lib/libsa/loadfile.c.
*/
void
elf32bsdboot(void)
{
int cpsr;
#define elf ((Elf32_Ehdr *)bsdimage)
#define phdr ((Elf32_Phdr *)((char *)elf + elf->e_phoff))
if (memcmp(elf->e_ident, ELFMAG, SELFMAG) != 0 ||
elf->e_ident[EI_CLASS] != ELFCLASS32)
return;
__asm__ volatile ("mrs %0, cpsr_all" : "=r" (cpsr));
cpsr |= 0xc0; /* set FI */
__asm__ volatile ("msr cpsr_all, %0" :: "r" (cpsr));
minv = (vaddr_t)~0;
for (i = 0; i < elf->e_phnum; i++) {
if (phdr[i].p_type != PT_LOAD ||
(phdr[i].p_flags & (PF_W|PF_R|PF_X)) == 0)
continue;
#define IS_TEXT(p) (p.p_flags & PF_X)
#define IS_DATA(p) ((p.p_flags & PF_X) == 0)
#define IS_BSS(p) (p.p_filesz < p.p_memsz)
/*
* XXX: Assume first address is lowest
*/
if (IS_TEXT(phdr[i]) || IS_DATA(phdr[i])) {
sz = phdr[i].p_filesz;
while (sz > 0) {
sz--;
((char *)phdr[i].p_vaddr)[sz] =
(((char *)elf) + phdr[i].p_offset)[sz];
if (minv > phdr[i].p_vaddr)
minv = phdr[i].p_vaddr;
}
}
}
sz = BOOTARGS_BUFSIZ;
while (sz > 0) {
sz--;
((char *)minv - BOOTARGS_BUFSIZ)[sz] = bootargs[sz];
}
addr = (int *)(elf->e_entry);
__asm__ volatile (
"mov r0, %0;"
"mov r2, #0;"
"mov r1, #(0x00000010 | 0x00000020);"
"mcr 15, 0, r1, c1, c0, 0;"
"mcr 15, 0, r2, c8, c7, 0 /* nail I+D TLB on ARMv4 and greater */;"
"mov pc, r0" :: "r"(addr) : "r0","r1","r2");
}
/*
* Initialize the LKM.
*/
int
init_module()
{
struct proc_dir_entry *entry;
int rc;
rc = register_chrdev(ZBOOTDEV_MAJOR, ZBOOTDEV_NAME, &fops);
if (rc != 0) {
printk("%s: register_chrdev(%d, ...): error %d\n",
ZBOOTMOD_NAME, -rc);
return 1;
}
entry = proc_mknod(ZBOOTDEV_NAME, ZBOOTDEV_MODE | S_IFCHR,
&proc_root, MKDEV(ZBOOTDEV_MAJOR, 0));
if (entry == (struct proc_dir_entry *)0) {
(void)unregister_chrdev(ZBOOTDEV_MAJOR, ZBOOTDEV_NAME);
return 1;
}
printk("%s: OpenBSD/" MACHINE " bootstrap device is %d,0\n",
ZBOOTMOD_NAME, ZBOOTDEV_MAJOR);
return 0;
}
/*
* Cleanup - undo whatever init_module did.
*/
void
cleanup_module()
{
(void)unregister_chrdev(ZBOOTDEV_MAJOR, ZBOOTDEV_NAME);
remove_proc_entry(ZBOOTDEV_NAME, &proc_root);
printk("%s: OpenBSD/" MACHINE " bootstrap device unloaded\n",
ZBOOTMOD_NAME);
}
ssize_t
zbsdmod_write(struct file *f, const char *buf, size_t len, loff_t *offp)
{
if (len < 1)
return 0;
if (*offp + len >= sizeof(bsdimage))
return EFBIG;
memcpy(((char *)bsdimage) + *offp, buf, len);
*offp += len;
if (*offp > position)
position = *offp;
return len;
}
int
zbsdmod_open(struct inode *ino, struct file *f)
{
/* XXX superuser check */
if (isopen)
return -EBUSY;
isopen = 1;
position = 0;
return 0;
}
int
zbsdmod_close(struct inode *ino, struct file *f)
{
if (isopen) {
if (position > 0) {
printk("%s: loaded %d bytes\n", ZBOOTDEV_NAME,
position);
if (position < BOOTARGS_BUFSIZ) {
*(int *)bootargs = BOOTARGS_MAGIC;
bootargs[position + sizeof(int)] = '\0';
memcpy(bootargs + sizeof(int), bsdimage,
position);
} else {
#ifndef _TEST
elf32bsdboot();
printk("%s: boot failed\n", ZBOOTDEV_NAME);
#else
printk("/* boot() */\n");
#endif
}
}
isopen = 0;
return 0;
}
return -EBUSY;
}
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