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/* $OpenBSD: rd.c,v 1.4 2013/03/24 19:20:35 deraadt Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* 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.
*/
#include <sys/param.h>
#include "libsa.h"
#include <machine/cpu.h>
#include <sys/exec_elf.h>
static off_t rdoffs;
/*
* INITRD I/O
*/
int
rd_iostrategy(void *f, int rw, daddr32_t dblk, size_t size, void *buf,
size_t *rsize)
{
/* never invoked directly */
return ENXIO;
}
int
rd_ioopen(struct open_file *f, ...)
{
return 0;
}
int
rd_ioclose(struct open_file *f)
{
return 0;
}
int
rd_isvalid()
{
Elf64_Ehdr *elf64 = (Elf64_Ehdr *)INITRD_BASE;
if (memcmp(elf64->e_ident, ELFMAG, SELFMAG) != 0 ||
elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
elf64->e_ident[EI_DATA] != ELFDATA2LSB ||
elf64->e_type != ET_EXEC || elf64->e_machine != EM_MIPS)
return 0;
return 1;
}
void
rd_invalidate()
{
bzero((void *)INITRD_BASE, sizeof(Elf64_Ehdr));
}
/*
* INITRD filesystem
*/
int
rdfs_open(char *path, struct open_file *f)
{
if (f->f_dev->dv_open == rd_ioopen) {
if (strcmp(path, kernelfile) == 0) {
rdoffs = 0;
return 0;
} else
return ENOENT;
}
return EINVAL;
}
int
rdfs_close(struct open_file *f)
{
return 0;
}
int
rdfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
{
if (size != 0) {
bcopy((void *)(INITRD_BASE + rdoffs), buf, size);
rdoffs += size;
}
*resid = 0;
return 0;
}
int
rdfs_write(struct open_file *f, void *buf, size_t size, size_t *resid)
{
return EROFS;
}
off_t
rdfs_seek(struct open_file *f, off_t offset, int whence)
{
switch (whence) {
case 0: /* SEEK_SET */
rdoffs = offset;
break;
case 1: /* SEEK_CUR */
rdoffs += offset;
break;
default:
errno = EIO;
return -1;
}
return rdoffs;
}
int
rdfs_stat(struct open_file *f, struct stat *sb)
{
return EIO;
}
#ifndef NO_READDIR
int
rdfs_readdir(struct open_file *f, char *path)
{
return EIO;
}
#endif
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