From 5a2a1d8093d0372d7fc2ad1a9ae4893c888e6623 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 20 Mar 2023 08:30:09 +1300
Subject: [PATCH] x86: Exit EFI boot services before starting kernel
When running the EFI app, we need to exit boot services before jumping
to Linux.
At some point it may be possible to jump to Linux and pass on the system
table, and:
* install the device-tree as configuration table
* use LoadImage() to load the kernel image (e.g. from memory)
* start the image with StartImage()
This should allow the Linux efistub to be used. For now, this is not
implemented.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
arch/x86/lib/bootm.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/x86/lib/bootm.c b/arch/x86/lib/bootm.c
index 9beb376bb9..61cb7bc611 100644
--- a/arch/x86/lib/bootm.c
+++ b/arch/x86/lib/bootm.c
@@ -10,6 +10,7 @@
#include <common.h>
#include <bootstage.h>
#include <command.h>
+#include <efi.h>
#include <hang.h>
#include <log.h>
#include <asm/global_data.h>
@@ -156,6 +157,23 @@ int boot_linux_kernel(ulong setup_base, ulong entry, bool image_64bit)
#ifdef CONFIG_SYS_COREBOOT
timestamp_add_now(TS_U_BOOT_START_KERNEL);
#endif
+
+ /*
+ * Exit EFI boot services just before jumping, after all console
+ * output, since the console won't be available afterwards.
+ */
+ if (IS_ENABLED(CONFIG_EFI_APP)) {
+ int ret;
+
+ ret = efi_store_memory_map(efi_get_priv());
+ if (ret)
+ return ret;
+ printf("Exiting EFI boot services\n");
+ ret = efi_call_exit_boot_services();
+ if (ret)
+ return ret;
+ }
+
if (image_64bit) {
if (!cpu_has_64bit()) {
puts("Cannot boot 64-bit kernel on 32-bit machine\n");
--
2.39.5