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