/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2007 Semihalf, Rafal Jaworowski <raj@semihalf.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <stand.h>
#include <stdint.h>
#include "api_public.h"
#include "glue.h"
#include "libuboot.h"
/*
* MD primitives supporting placement of module data
*/
#ifdef __arm__
#define KERN_ALIGN (2 * 1024 * 1024)
#else
#define KERN_ALIGN PAGE_SIZE
#endif
/*
* Avoid low memory, u-boot puts things like args and dtb blobs there.
*/
#define KERN_MINADDR max(KERN_ALIGN, (1024 * 1024))
extern void _start(void); /* ubldr entry point address. */
/*
* This is called for every object loaded (kernel, module, dtb file, etc). The
* expected return value is the next address at or after the given addr which is
* appropriate for loading the given object described by type and data. On each
* call the addr is the next address following the previously loaded object.
*
* The first call is for loading the kernel, and the addr argument will be zero,
* and we search for a big block of ram to load the kernel and modules.
*
* On subsequent calls the addr will be non-zero, and we just round it up so
* that each object begins on a page boundary.
*/
uint64_t
uboot_loadaddr(u_int type, void *data, uint64_t addr)
{
struct sys_info *si;
uint64_t sblock, eblock, subldr, eubldr;
uint64_t biggest_block, this_block;
uint64_t biggest_size, this_size;
int i;
char *envstr;
if (addr == 0) {
/*
* If the loader_kernaddr environment variable is set, blindly
* honor it. It had better be right. We force interpretation
* of the value in base-16 regardless of any leading 0x prefix,
* because that's the U-Boot convention.
*/
envstr = ub_env_get("loader_kernaddr");
if (envstr != NULL)
return (strtoul(envstr, NULL, 16));
/*
* Find addr/size of largest DRAM block. Carve our own address
* range out of the block, because loading the kernel over the
* top ourself is a poor memory-conservation strategy. Avoid
* memory at beginning of the first block of physical ram,
* since u-boot likes to pass args and data there. Assume that
* u-boot has moved itself to the very top of ram and
* optimistically assume that we won't run into it up there.
*/
if ((si = ub_get_sys_info()) == NULL)
panic("could not retrieve system info");
biggest_block = 0;
biggest_size = 0;
subldr = rounddown2((uintptr_t)_start, KERN_ALIGN);
eubldr = roundup2((uint64_t)uboot_heap_end, KERN_ALIGN);
for (i = 0; i < si->mr_no; i++) {
if (si->mr[i].flags != MR_ATTR_DRAM)
continue;
sblock = roundup2((uint64_t)si->mr[i].start,
KERN_ALIGN);
eblock = rounddown2((uint64_t)si->mr[i].start +
si->mr[i].size, KERN_ALIGN);
if (biggest_size == 0)
sblock += KERN_MINADDR;
if (subldr >= sblock && subldr < eblock) {
if (subldr - sblock > eblock - eubldr) {
this_block = sblock;
this_size = subldr - sblock;
} else {
this_block = eubldr;
this_size = eblock - eubldr;
}
} else if (subldr < sblock && eubldr < eblock) {
/* Loader is below or engulfs the sblock */
this_block = (eubldr < sblock) ? sblock : eubldr;
this_size = eblock - this_block;
} else {
this_block = 0;
this_size = 0;
}
if (biggest_size < this_size) {
biggest_block = this_block;
biggest_size = this_size;
}
}
if (biggest_size == 0)
panic("Not enough DRAM to load kernel");
#if 0
printf("Loading kernel into region 0x%08jx-0x%08jx (%ju MiB)\n",
(uintmax_t)biggest_block,
(uintmax_t)biggest_block + biggest_size - 1,
(uintmax_t)biggest_size / 1024 / 1024);
#endif
return (biggest_block);
}
return roundup2(addr, PAGE_SIZE);
}
ssize_t
uboot_copyin(const void *src, vm_offset_t dest, const size_t len)
{
bcopy(src, (void *)dest, len);
return (len);
}
ssize_t
uboot_copyout(const vm_offset_t src, void *dest, const size_t len)
{
bcopy((void *)src, dest, len);
return (len);
}
ssize_t
uboot_readin(readin_handle_t fd, vm_offset_t dest, const size_t len)
{
return (VECTX_READ(fd, (void *)dest, len));
}
