The EFI stub can pass a table to U-Boot with information about the memory map
Potentially other things will follow. Add a way to access this table.
Signed-off-by: Simon Glass <s...@chromium.org>
Reviewed-by: Bin Meng <bmeng...@gmail.com>
---
Changes in v2: None
lib/efi/Makefile | 1 +
lib/efi/efi_info.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
create mode 100644 lib/efi/efi_info.c
diff --git a/lib/efi/Makefile b/lib/efi/Makefile
index 4bc67f0..e32dc14 100644
--- a/lib/efi/Makefile
+++ b/lib/efi/Makefile
@@ -5,6 +5,7 @@
#
obj-$(CONFIG_EFI_APP) += efi_app.o efi.o
+obj-$(CONFIG_EFI_STUB) += efi_info.o
CFLAGS_REMOVE_efi_stub.o := -mregparm=3 \
$(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)
diff --git a/lib/efi/efi_info.c b/lib/efi/efi_info.c
new file mode 100644
index 0000000..0cd9a7e
--- /dev/null
+++ b/lib/efi/efi_info.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * Access to the EFI information table
+ */
+
+#include <common.h>
+#include <efi.h>
+#include <errno.h>
+#include <mapmem.h>
+
+int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
+{
+ struct efi_entry_hdr *entry;
+ struct efi_info_hdr *info;
+ int ret;
+
+ if (!gd->arch.table)
+ return -ENODATA;
+
+ info = map_sysmem(gd->arch.table, 0);
+ if (info->version != EFI_TABLE_VERSION) {
+ ret = -EPROTONOSUPPORT;
+ goto err;
+ }
+
+ entry = (struct efi_entry_hdr *)((ulong)info + info->hdr_size);
+ while (entry->type != EFIET_END) {
+ if (entry->type == type) {
+ if (entry->addr)
+ *datap = map_sysmem(entry->addr, entry->size);
+ else
+ *datap = entry + 1;
+ *sizep = entry->size;
+ return 0;
+ }
+ entry = (struct efi_entry_hdr *)((ulong)entry + entry->link);
+ }
+
+ ret = -ENOENT;
+err:
+ unmap_sysmem(info);
+
+ return ret;
+}
--
2.5.0.rc2.392.g76e840b
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
