diff options
Diffstat (limited to 'stand/uboot/lib/copy.c')
| -rw-r--r-- | stand/uboot/lib/copy.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/stand/uboot/lib/copy.c b/stand/uboot/lib/copy.c new file mode 100644 index 0000000..131b88d --- /dev/null +++ b/stand/uboot/lib/copy.c @@ -0,0 +1,166 @@ +/*- + * 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/cdefs.h> +__FBSDID("$FreeBSD$"); +#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\n"); +#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(const int fd, vm_offset_t dest, const size_t len) +{ + return (read(fd, (void *)dest, len)); +} |
