[U-Boot] [PATCH v2 1/2] x86: Add efi runtime reset

[Alexander Graf <agraf@suse.de>]

Our selftest will soon test the actual runtime reset function rather than
the boot time one. For this, we need to ensure that the runtime version
actually succeeds on x86 to keep our travis tests work.

So this patch implements an x86 runtime reset function. It is missing
shutdown functionality today, but OSs usually implement that via ACPI
and this function does more than the stub from before, so it's at least
an improvement.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 drivers/sysreset/sysreset_x86.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
index 20b958cfd4..efed45ccb7 100644
--- a/drivers/sysreset/sysreset_x86.c
+++ b/drivers/sysreset/sysreset_x86.c
@@ -10,6 +10,29 @@
 #include <sysreset.h>
 #include <asm/io.h>
 #include <asm/processor.h>
+#include <efi_loader.h>
+
+#ifdef CONFIG_EFI_LOADER
+void __efi_runtime EFIAPI efi_reset_system(
+			enum efi_reset_type reset_type,
+			efi_status_t reset_status,
+			unsigned long data_size, void *reset_data)
+{
+	u32 value = 0;
+
+	if (reset_type == EFI_RESET_COLD)
+		value = SYS_RST | RST_CPU | FULL_RST;
+	else if (reset_type == EFI_RESET_WARM)
+		value = SYS_RST | RST_CPU;
+
+	/* TODO EFI_RESET_PLATFORM_SPECIFIC and EFI_RESET_SHUTDOWN */
+
+	if (value)
+		outb(value, IO_PORT_RESET);
+
+	while (1) { }
+}
+#endif
 
 static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
 {
-- 
2.12.3