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lib: Add FIT payload support

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* Add support for parsing and booting FIT payloads.
* Build fit loader code from depthcharge.
* Fix coding style.
* Add Kconfig option to add compiletime support for FIT.
* Add support for initrd.
* Add default compat strings
* Apply optional devicetree fixups using dt_apply_fixups

Starting at this point the CBFS payload/ can be either SELF or FIT.

Tested on Cavium SoC: Parses and loads a Linux kernel 4.16.3.
Tested on Cavium SoC: Parses and loads a Linux kernel 4.15.0.
Tested on Cavium SoC: Parses and loads a Linux kernel 4.1.52.

Change-Id: I0f27b92a5e074966f893399eb401eb97d784850d
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25019
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Patrick Rudolph
2018-04-19 14:39:07 +02:00
committed by Philipp Deppenwiese
parent 8c986ab263
commit a892cde653
9 changed files with 840 additions and 261 deletions
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1
src/arch/arm64/Makefile.inc
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@@ -136,6 +136,7 @@ ramstage-y += memcpy.S
ramstage-y += memmove.S
ramstage-$(CONFIG_ARM64_USE_ARM_TRUSTED_FIRMWARE) += arm_tf.c
ramstage-y += transition.c transition_asm.S
ramstage-$(CONFIG_PAYLOAD_FIT_SUPPORT) += fit_payload.c
rmodules_arm64-y += memset.S
rmodules_arm64-y += memcpy.S

262
src/arch/arm64/fit_payload.c Normal file
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@@ -0,0 +1,262 @@
/*
* Copyright 2013 Google Inc.
* Copyright 2018 Facebook, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <console/console.h>
#include <bootmem.h>
#include <stdlib.h>
#include <program_loading.h>
#include <string.h>
#include <commonlib/compression.h>
#include <commonlib/cbfs_serialized.h>
#include <lib.h>
#include <fit.h>
#include <endian.h>
#define MAX_KERNEL_SIZE (64*MiB)
struct arm64_kernel_header {
u32 code0;
u32 code1;
u64 text_offset;
u64 image_size;
u64 flags;
u64 res2;
u64 res3;
u64 res4;
u32 magic;
#define KERNEL_HEADER_MAGIC 0x644d5241
u32 res5;
};
static struct {
union {
struct arm64_kernel_header header;
u8 raw[sizeof(struct arm64_kernel_header) + 0x100];
};
#define SCRATCH_CANARY_VALUE 0xdeadbeef
u32 canary;
} scratch;
/* Returns true if decompressing was successful and it looks like a kernel. */
static bool decompress_kernel_header(const struct fit_image_node *node)
{
/* Partially decompress to get text_offset. Can't check for errors. */
scratch.canary = SCRATCH_CANARY_VALUE;
switch (node->compression) {
case CBFS_COMPRESS_NONE:
memcpy(scratch.raw, node->data, sizeof(scratch.raw));
break;
case CBFS_COMPRESS_LZMA:
ulzman(node->data, node->size,
scratch.raw, sizeof(scratch.raw));
break;
case CBFS_COMPRESS_LZ4:
ulz4fn(node->data, node->size,
scratch.raw, sizeof(scratch.raw));
break;
default:
printk(BIOS_ERR, "ERROR: Unsupported compression algorithm!\n");
return false;
}
/* Should never happen, but if it does we'll want to know. */
if (scratch.canary != SCRATCH_CANARY_VALUE)
die("ERROR: Partial decompression ran over scratchbuf!\n");
if (scratch.header.magic != KERNEL_HEADER_MAGIC) {
printk(BIOS_ERR,
"ERROR: Invalid kernel magic: %#.8x\n != %#.8x\n",
scratch.header.magic, KERNEL_HEADER_MAGIC);
return false;
}
/**
* Prior to v3.17, the endianness of text_offset was not specified. In
* these cases image_size is zero and text_offset is 0x80000 in the
* endianness of the kernel. Where image_size is non-zero image_size is
* little-endian and must be respected. Where image_size is zero,
* text_offset can be assumed to be 0x80000.
*/
if (!scratch.header.image_size)
scratch.header.text_offset = cpu_to_le64(0x80000);
return true;
}
static size_t get_kernel_size(const struct fit_image_node *node)
{
if (scratch.header.image_size)
return le64_to_cpu(scratch.header.image_size);
/**
* When image_size is zero, a bootloader should attempt to keep as much
* memory as possible free for use by the kernel immediately after the
* end of the kernel image. The amount of space required will vary
* depending on selected features, and is effectively unbound.
*/
printk(BIOS_WARNING, "FIT: image_size not set in kernel header.\n"
"Leaving additional %u MiB of free space after kernel.\n",
MAX_KERNEL_SIZE >> 20);
return node->size + MAX_KERNEL_SIZE;
}
static bool fit_place_kernel(const struct range_entry *r, void *arg)
{
struct region *region = arg;
resource_t start;
if (range_entry_tag(r) != BM_MEM_RAM)
return true;
/**
* The Image must be placed text_offset bytes from a 2MB aligned base
* address anywhere in usable system RAM and called there. The region
* between the 2 MB aligned base address and the start of the image has
* no special significance to the kernel, and may be used for other
* purposes.
*
* If the reserved memory (BL31 for example) is smaller than text_offset
* we can use the 2 MiB base address, otherwise use the next 2 MiB page.
* It's not mandatory, but wastes less memory below the kernel.
*/
start = ALIGN_DOWN(range_entry_base(r), 2 * MiB) +
le64_to_cpu(scratch.header.text_offset);
if (start < range_entry_base(r))
start += 2 * MiB;
/**
* At least image_size bytes from the start of the image must be free
* for use by the kernel.
*/
if (start + region->size < range_entry_end(r)) {
region->offset = (size_t)start;
return false;
}
return true;
}
/**
* Place the region in free memory range.
*
* The caller has to set region->offset to the minimum allowed address.
* The region->offset is usually 0 on kernel >v4.6 and kernel_base + kernel_size
* on kernel <v4.6.
*/
static bool fit_place_mem(const struct range_entry *r, void *arg)
{
struct region *region = arg;
resource_t start;
if (range_entry_tag(r) != BM_MEM_RAM)
return true;
/* Linux 4.15 doesn't like 4KiB alignment. Align to 1 MiB for now. */
start = ALIGN_UP(MAX(region->offset, range_entry_base(r)), 1 * MiB);
if (start + region->size < range_entry_end(r)) {
region->offset = (size_t)start;
return false;
}
return true;
}
bool fit_payload_arch(struct prog *payload, struct fit_config_node *config,
struct region *kernel,
struct region *fdt,
struct region *initrd)
{
bool place_anywhere;
void *arg = NULL;
if (!config->fdt || !fdt) {
printk(BIOS_CRIT, "CRIT: Providing a valid FDT is mandatory to "
"boot an ARM64 kernel!\n");
return false;
}
if (!decompress_kernel_header(config->kernel_node)) {
printk(BIOS_CRIT, "CRIT: Payload doesn't look like an ARM64"
" kernel Image.\n");
return false;
}
/* Update kernel size from image header, if possible */
kernel->size = get_kernel_size(config->kernel_node);
printk(BIOS_DEBUG, "FIT: Using kernel size of 0x%zx bytes\n",
kernel->size);
/**
* The code assumes that bootmem_walk provides a sorted list of memory
* regions, starting from the lowest address.
* The order of the calls here doesn't matter, as the placement is
* enforced in the called functions.
* For details check code on top.
*/
if (!bootmem_walk(fit_place_kernel, kernel))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(kernel->offset, kernel->size, BM_MEM_PAYLOAD);
/**
* NOTE: versions prior to v4.6 cannot make use of memory below the
* physical offset of the Image so it is recommended that the Image be
* placed as close as possible to the start of system RAM.
*
* For kernel <v4.6 the INITRD and FDT can't be placed below the kernel.
* In that case set region offset to an address on top of kernel.
*/
place_anywhere = !!(le64_to_cpu(scratch.header.flags) & (1 << 3));
printk(BIOS_DEBUG, "FIT: Placing FDT and INITRD %s\n",
place_anywhere ? "anywhere" : "on top of kernel");
/* Place INITRD */
if (config->ramdisk) {
if (place_anywhere)
initrd->offset = 0;
else
initrd->offset = kernel->offset + kernel->size;
if (!bootmem_walk(fit_place_mem, initrd))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(initrd->offset, initrd->size, BM_MEM_PAYLOAD);
}
/* Place FDT */
if (place_anywhere)
fdt->offset = 0;
else
fdt->offset = kernel->offset + kernel->size;
if (!bootmem_walk(fit_place_mem, fdt))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(fdt->offset, fdt->size, BM_MEM_PAYLOAD);
/* Kernel expects FDT as argument */
arg = (void *)fdt->offset;
prog_set_entry(payload, (void *)kernel->offset, arg);
bootmem_dump_ranges();
return true;
}