x86: zimage: Support booting Linux kernel from an EFI payload
At present Linux kernel loaded from U-Boot as an EFI payload does
not boot. This fills in kernel's boot params structure with the
required critical EFI information like system table address and
memory map stuff so that kernel can obtain essential data like
runtime services and ACPI table to boot.
With this patch, now U-Boot as an EFI payload becomes much more
practical: it is another option of kernel bootloader, ie, can be
a replacement for grub.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/efi/payload.c b/arch/x86/cpu/efi/payload.c
index 0e7c7c1..c323c7b 100644
--- a/arch/x86/cpu/efi/payload.c
+++ b/arch/x86/cpu/efi/payload.c
@@ -8,6 +8,7 @@
#include <efi.h>
#include <errno.h>
#include <usb.h>
+#include <asm/bootparam.h>
#include <asm/e820.h>
#include <asm/post.h>
@@ -250,3 +251,39 @@
return num_entries;
}
+
+void setup_efi_info(struct efi_info *efi_info)
+{
+ struct efi_entry_systable *table;
+ struct efi_entry_memmap *map;
+ char *signature;
+ int size, ret;
+
+ memset(efi_info, 0, sizeof(struct efi_info));
+
+ ret = efi_info_get(EFIET_SYS_TABLE, (void **)&table, &size);
+ if (ret) {
+ printf("Cannot find EFI system table, ret=%d\n", ret);
+ return;
+ }
+ efi_info->efi_systab = (u32)(table->sys_table);
+
+ ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
+ if (ret) {
+ printf("Cannot find EFI memory map tables, ret=%d\n", ret);
+ return;
+ }
+ efi_info->efi_memdesc_size = map->desc_size;
+ efi_info->efi_memdesc_version = map->version;
+ efi_info->efi_memmap = (u32)(map->desc);
+ efi_info->efi_memmap_size = size - sizeof(struct efi_entry_memmap);
+
+#ifdef CONFIG_EFI_STUB_64BIT
+ efi_info->efi_systab_hi = table->sys_table >> 32;
+ efi_info->efi_memmap_hi = (u64)(u32)(map->desc) >> 32;
+ signature = EFI64_LOADER_SIGNATURE;
+#else
+ signature = EFI32_LOADER_SIGNATURE;
+#endif
+ memcpy(&efi_info->efi_loader_signature, signature, 4);
+}