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@@ -0,0 +1,160 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * EFI_DT_FIXUP_PROTOCOL
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+ *
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+ * Copyright (c) 2020 Heinrich Schuchardt
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+ */
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+
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+#include <common.h>
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+#include <efi_dt_fixup.h>
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+#include <efi_loader.h>
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+#include <mapmem.h>
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+
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+static efi_status_t EFIAPI efi_dt_fixup(struct efi_dt_fixup_protocol *this,
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+ void *dtb,
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+ efi_uintn_t *buffer_size,
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+ u32 flags);
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+
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+struct efi_dt_fixup_protocol efi_dt_fixup_prot = {
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+ .revision = EFI_DT_FIXUP_PROTOCOL_REVISION,
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+ .fixup = efi_dt_fixup
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+};
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+
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+const efi_guid_t efi_guid_dt_fixup_protocol = EFI_DT_FIXUP_PROTOCOL_GUID;
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+
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+/**
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+ * efi_reserve_memory() - add reserved memory to memory map
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+ *
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+ * @addr: start address of the reserved memory range
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+ * @size: size of the reserved memory range
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+ * @nomap: indicates that the memory range shall not be accessed by the
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+ * UEFI payload
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+ */
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+static void efi_reserve_memory(u64 addr, u64 size, bool nomap)
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+{
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+ int type;
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+ efi_uintn_t ret;
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+
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+ /* Convert from sandbox address space. */
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+ addr = (uintptr_t)map_sysmem(addr, 0);
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+
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+ if (nomap)
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+ type = EFI_RESERVED_MEMORY_TYPE;
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+ else
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+ type = EFI_BOOT_SERVICES_DATA;
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+
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+ ret = efi_add_memory_map(addr, size, type);
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+ if (ret != EFI_SUCCESS)
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+ log_err("Reserved memory mapping failed addr %llx size %llx\n",
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+ addr, size);
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+}
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+
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+/**
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+ * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
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+ *
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+ * The mem_rsv entries of the FDT are added to the memory map. Any failures are
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+ * ignored because this is not critical and we would rather continue to try to
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+ * boot.
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+ *
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+ * @fdt: Pointer to device tree
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+ */
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+void efi_carve_out_dt_rsv(void *fdt)
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+{
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+ int nr_rsv, i;
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+ u64 addr, size;
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+ int nodeoffset, subnode;
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+
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+ nr_rsv = fdt_num_mem_rsv(fdt);
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+
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+ /* Look for an existing entry and add it to the efi mem map. */
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+ for (i = 0; i < nr_rsv; i++) {
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+ if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
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+ continue;
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+ efi_reserve_memory(addr, size, false);
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+ }
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+
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+ /* process reserved-memory */
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+ nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
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+ if (nodeoffset >= 0) {
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+ subnode = fdt_first_subnode(fdt, nodeoffset);
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+ while (subnode >= 0) {
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+ fdt_addr_t fdt_addr;
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+ fdt_size_t fdt_size;
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+
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+ /* check if this subnode has a reg property */
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+ fdt_addr = fdtdec_get_addr_size_auto_parent(
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+ fdt, nodeoffset, subnode,
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+ "reg", 0, &fdt_size, false);
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+ /*
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+ * The /reserved-memory node may have children with
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+ * a size instead of a reg property.
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+ */
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+ if (fdt_addr != FDT_ADDR_T_NONE &&
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+ fdtdec_get_is_enabled(fdt, subnode)) {
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+ bool nomap;
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+
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+ nomap = !!fdt_getprop(fdt, subnode, "no-map",
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+ NULL);
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+ efi_reserve_memory(fdt_addr, fdt_size, nomap);
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+ }
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+ subnode = fdt_next_subnode(fdt, subnode);
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+ }
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+ }
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+}
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+
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+static efi_status_t EFIAPI efi_dt_fixup(struct efi_dt_fixup_protocol *this,
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+ void *dtb,
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+ efi_uintn_t *buffer_size,
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+ u32 flags)
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+{
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+ efi_status_t ret;
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+ size_t required_size;
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+ bootm_headers_t img = { 0 };
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+
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+ EFI_ENTRY("%p, %p, %p, %d", this, dtb, buffer_size, flags);
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+
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+ if (this != &efi_dt_fixup_prot || !dtb || !buffer_size ||
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+ !flags || (flags & ~EFI_DT_ALL)) {
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+ ret = EFI_INVALID_PARAMETER;
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+ goto out;
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+ }
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+ if (fdt_check_header(dtb)) {
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+ ret = EFI_INVALID_PARAMETER;
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+ goto out;
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+ }
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+ if (flags & EFI_DT_APPLY_FIXUPS) {
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+ required_size = fdt_off_dt_strings(dtb) +
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+ fdt_size_dt_strings(dtb) +
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+ 0x3000;
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+ } else {
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+ required_size = fdt_totalsize(dtb);
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+ }
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+ if (required_size > *buffer_size) {
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+ *buffer_size = required_size;
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+ ret = EFI_BUFFER_TOO_SMALL;
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+ goto out;
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+ }
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+ fdt_set_totalsize(dtb, *buffer_size);
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+
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+ if (flags & EFI_DT_APPLY_FIXUPS) {
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+ if (image_setup_libfdt(&img, dtb, 0, NULL)) {
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+ log_err("failed to process device tree\n");
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+ ret = EFI_INVALID_PARAMETER;
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+ goto out;
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+ }
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+ }
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+ if (flags & EFI_DT_RESERVE_MEMORY)
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+ efi_carve_out_dt_rsv(dtb);
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+
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+ if (EFI_DT_INSTALL_TABLE) {
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+ ret = efi_install_configuration_table(&efi_guid_fdt, dtb);
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+ if (ret != EFI_SUCCESS) {
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+ log_err("ERROR: failed to install device tree\n");
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+ goto out;
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+ }
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+ }
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+
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+ ret = EFI_SUCCESS;
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+out:
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+ return EFI_EXIT(ret);
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+}
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