[XS] Change in coreboot[main]: drivers/intel: Align FSP debug handler with EFI calling convention

[Subrata Banik (Code Review)]

Attention is currently required from: Andrey Petrov, Ronak Kanabar.

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/81621?usp=email )

Change subject: drivers/intel: Align FSP debug handler with EFI calling convention
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drivers/intel: Align FSP debug handler with EFI calling convention

Ensures the FSP debug handler adheres to the EFI calling convention,
enabling seamless integration with coreboot infrastructure.

This is critical for 64-bit coreboot and FSP communications.

BUG=b:242829490
TEST=FSP debug logs successfully captured via coreboot event handler.

Change-Id: I9085a6c7d50e58fb56cbbc61da3a0af094d0dc05
Signed-off-by: Subrata Banik 
---
M src/drivers/intel/fsp2_0/fsp_debug_event.c
M src/drivers/intel/fsp2_0/include/fsp/fsp_debug_event.h
2 files changed, 2 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/81621/1

diff --git a/src/drivers/intel/fsp2_0/fsp_debug_event.c b/src/drivers/intel/fsp2_0/fsp_debug_event.c
index 2ebecc0..4b3e151a 100644
--- a/src/drivers/intel/fsp2_0/fsp_debug_event.c
+++ b/src/drivers/intel/fsp2_0/fsp_debug_event.c
@@ -17,7 +17,7 @@
    return FSP_SUCCESS;
 }

-efi_return_status_t fsp_debug_event_handler(efi_status_code_type_t ignored1,
+__efiapi efi_return_status_t fsp_debug_event_handler(efi_status_code_type_t ignored1,
    efi_status_code_value_t ignored2, efi_uint32_t ignored3, efi_guid_t *ignored4,
    efi_status_code_data_t *data)
 {
diff --git a/src/drivers/intel/fsp2_0/include/fsp/fsp_debug_event.h b/src/drivers/intel/fsp2_0/include/fsp/fsp_debug_event.h
index 7d50c1e..149629a 100644
--- a/src/drivers/intel/fsp2_0/include/fsp/fsp_debug_event.h
+++ b/src/drivers/intel/fsp2_0/include/fsp/fsp_debug_event.h
@@ -12,7 +12,7 @@
 #include <fsp/soc_binding.h>

/* fsp debug event handler */
-efi_return_status_t fsp_debug_event_handler(efi_status_code_type_t ignored1,
+__efiapi efi_return_status_t fsp_debug_event_handler(efi_status_code_type_t ignored1,
    efi_status_code_value_t ignored2, efi_uint32_t ignored3, efi_guid_t *ignored4,
    efi_status_code_data_t *data);