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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * EFI_DT_FIXUP_PROTOCOL
- *
- * Copyright (c) 2020 Heinrich Schuchardt
- */
- #include <common.h>
- #include <efi_dt_fixup.h>
- #include <efi_loader.h>
- #include <fdtdec.h>
- #include <mapmem.h>
- const efi_guid_t efi_guid_dt_fixup_protocol = EFI_DT_FIXUP_PROTOCOL_GUID;
- /**
- * efi_reserve_memory() - add reserved memory to memory map
- *
- * @addr: start address of the reserved memory range
- * @size: size of the reserved memory range
- * @nomap: indicates that the memory range shall not be accessed by the
- * UEFI payload
- */
- static void efi_reserve_memory(u64 addr, u64 size, bool nomap)
- {
- int type;
- efi_uintn_t ret;
- /* Convert from sandbox address space. */
- addr = (uintptr_t)map_sysmem(addr, 0);
- if (nomap)
- type = EFI_RESERVED_MEMORY_TYPE;
- else
- type = EFI_BOOT_SERVICES_DATA;
- ret = efi_add_memory_map(addr, size, type);
- if (ret != EFI_SUCCESS)
- log_err("Reserved memory mapping failed addr %llx size %llx\n",
- addr, size);
- }
- /**
- * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
- *
- * The mem_rsv entries of the FDT are added to the memory map. Any failures are
- * ignored because this is not critical and we would rather continue to try to
- * boot.
- *
- * @fdt: Pointer to device tree
- */
- void efi_carve_out_dt_rsv(void *fdt)
- {
- int nr_rsv, i;
- u64 addr, size;
- int nodeoffset, subnode;
- nr_rsv = fdt_num_mem_rsv(fdt);
- /* Look for an existing entry and add it to the efi mem map. */
- for (i = 0; i < nr_rsv; i++) {
- if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
- continue;
- efi_reserve_memory(addr, size, true);
- }
- /* process reserved-memory */
- nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
- if (nodeoffset >= 0) {
- subnode = fdt_first_subnode(fdt, nodeoffset);
- while (subnode >= 0) {
- fdt_addr_t fdt_addr;
- fdt_size_t fdt_size;
- /* check if this subnode has a reg property */
- fdt_addr = fdtdec_get_addr_size_auto_parent(
- fdt, nodeoffset, subnode,
- "reg", 0, &fdt_size, false);
- /*
- * The /reserved-memory node may have children with
- * a size instead of a reg property.
- */
- if (fdt_addr != FDT_ADDR_T_NONE &&
- fdtdec_get_is_enabled(fdt, subnode)) {
- bool nomap;
- nomap = !!fdt_getprop(fdt, subnode, "no-map",
- NULL);
- efi_reserve_memory(fdt_addr, fdt_size, nomap);
- }
- subnode = fdt_next_subnode(fdt, subnode);
- }
- }
- }
- /**
- * efi_dt_fixup() - fix up device tree
- *
- * This function implements the Fixup() service of the
- * EFI Device Tree Fixup Protocol.
- *
- * @this: instance of the protocol
- * @dtb: device tree provided by caller
- * @buffer_size: size of buffer for the device tree including free space
- * @flags: bit field designating action to be performed
- * Return: status code
- */
- static efi_status_t __maybe_unused EFIAPI
- efi_dt_fixup(struct efi_dt_fixup_protocol *this, void *dtb,
- efi_uintn_t *buffer_size, u32 flags)
- {
- efi_status_t ret;
- size_t required_size;
- size_t total_size;
- bootm_headers_t img = { 0 };
- EFI_ENTRY("%p, %p, %p, %d", this, dtb, buffer_size, flags);
- if (this != &efi_dt_fixup_prot || !dtb || !buffer_size ||
- !flags || (flags & ~EFI_DT_ALL)) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (fdt_check_header(dtb)) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (flags & EFI_DT_APPLY_FIXUPS) {
- /* Check size */
- required_size = fdt_off_dt_strings(dtb) +
- fdt_size_dt_strings(dtb) +
- 0x3000;
- total_size = fdt_totalsize(dtb);
- if (required_size < total_size)
- required_size = total_size;
- if (required_size > *buffer_size) {
- *buffer_size = required_size;
- ret = EFI_BUFFER_TOO_SMALL;
- goto out;
- }
- fdt_set_totalsize(dtb, *buffer_size);
- if (image_setup_libfdt(&img, dtb, 0, NULL)) {
- log_err("failed to process device tree\n");
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- }
- if (flags & EFI_DT_RESERVE_MEMORY)
- efi_carve_out_dt_rsv(dtb);
- if (flags & EFI_DT_INSTALL_TABLE) {
- ret = efi_install_configuration_table(&efi_guid_fdt, dtb);
- if (ret != EFI_SUCCESS) {
- log_err("failed to install device tree\n");
- goto out;
- }
- }
- ret = EFI_SUCCESS;
- out:
- return EFI_EXIT(ret);
- }
- struct efi_dt_fixup_protocol efi_dt_fixup_prot = {
- .revision = EFI_DT_FIXUP_PROTOCOL_REVISION,
- .fixup = efi_dt_fixup
- };
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