diff options
Diffstat (limited to 'src/arch/riscv')
| -rw-r--r-- | src/arch/riscv/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/arch/riscv/fit_payload.c | 141 |
2 files changed, 142 insertions, 0 deletions
diff --git a/src/arch/riscv/Makefile.inc b/src/arch/riscv/Makefile.inc index 01168593f1..0039fab180 100644 --- a/src/arch/riscv/Makefile.inc +++ b/src/arch/riscv/Makefile.inc @@ -147,6 +147,7 @@ ramstage-y += boot.c ramstage-y += tables.c ramstage-y += payload.c ramstage-$(ARCH_RISCV_PMP) += pmp.c +ramstage-y += fit_payload.c ramstage-y += \ $(top)/src/lib/memchr.c \ $(top)/src/lib/memcmp.c \ diff --git a/src/arch/riscv/fit_payload.c b/src/arch/riscv/fit_payload.c new file mode 100644 index 0000000000..60a4bc0557 --- /dev/null +++ b/src/arch/riscv/fit_payload.c @@ -0,0 +1,141 @@ +/* + * Copyright 2013 Google Inc. + * Copyright 2018 Facebook, Inc. + * Copyright 2019 9elements Agency GmbH <patrick.rudolph@9elements.com> + * + * 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> + +/* Implements a Berkley Boot Loader (BBL) compatible payload loading */ + +#define MAX_KERNEL_SIZE (64*MiB) + +#if CONFIG(ARCH_RISCV_RV32) +#define SECTION_ALIGN (4 * MiB) +#endif +#if CONFIG(ARCH_RISCV_RV64) +#define SECTION_ALIGN (2 * MiB) +#endif + +static size_t get_kernel_size(const struct fit_image_node *node) +{ + /* + * Since we don't have a way to determine the uncompressed size of the + * kernel, we have 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_INFO, + "FIT: Leaving additional %u MiB of free space after kernel.\n", + MAX_KERNEL_SIZE >> 20); + + return node->size + MAX_KERNEL_SIZE; +} + +/** + * Place the region in free memory range. + * + * The caller has to set region->offset to the minimum allowed address. + */ +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; + + /* Section must be aligned at page boundary */ + start = ALIGN_UP(MAX(region->offset, range_entry_base(r)), SECTION_ALIGN); + + 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) +{ + void *arg = NULL; + + if (!config->fdt || !fdt) { + printk(BIOS_CRIT, "CRIT: Providing a valid FDT is mandatory to " + "boot a RISC-V kernel!\n"); + return false; + /* TODO: Fall back to the ROM FDT? */ + } + + /* Update kernel size from image header, if possible */ + kernel->size = get_kernel_size(config->kernel); + 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. + */ + kernel->offset = 0; + if (!bootmem_walk(fit_place_mem, kernel)) + return false; + + /* Mark as reserved for future allocations. */ + bootmem_add_range(kernel->offset, kernel->size, BM_MEM_PAYLOAD); + + /* Place FDT and INITRD after kernel. */ + + /* Place INITRD */ + if (config->ramdisk) { + 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 */ + 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; +} |