45f8d9f9a8
Previously, ubldr would use the virtual addresses in the elf headers by masking off the high bits and assuming the result was a physical address where the kernel should be loaded. That would sometimes discard significant bits of the physical address, but the effects of that were undone by archsw copy code that would find a large block of memory and apply an offset to the source/dest copy addresses. The result was that things were loaded at a different physical address than requested by the higher code layers, but that worked because other adjustments were applied later (such as when jumping to the entry point). Very confusing, and somewhat fragile. Now the archsw copy routines are just simple copies, and instead archsw.arch_loadaddr is implemented to choose a load address. The new routine uses some of the code from the old offset-translation routine to find the largest block of ram, but it excludes ubldr itself from that range, and also excludes If ubldr splits the largest block of ram in two, the kernel is loaded into the bottom of whichever resulting block is larger. As part of eliminating ubldr itself from the ram ranges, export the heap start/end addresses in a pair of new global variables. This change means that the virtual addresses in the arm kernel elf headers now have no meaning at all, except for the entry point address. There is an implicit assumption that the entry point is in the first text page, and that the address in the the header can be turned into an offset by masking it with PAGE_MASK. In the future we can link all arm kernels at a virtual address of 0xC0000000 with no need to use any low-order part of the address to influence where in ram the kernel gets loaded.
158 lines
5.0 KiB
C
158 lines
5.0 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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uintptr_t sblock, eblock, subldr, eubldr;
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uintptr_t biggest_block, this_block;
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size_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(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(si->mr[i].start, KERN_ALIGN);
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eblock = rounddown2(si->mr[i].start + si->mr[i].size,
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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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}
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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\n");
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#if 0
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printf("Loading kernel into region 0x%08x-0x%08x (%u MiB)\n",
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biggest_block, biggest_block + biggest_size - 1,
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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(const int fd, vm_offset_t dest, const size_t len)
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{
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return (read(fd, (void *)dest, len));
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}
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