Add more comments for IntelFramework's header files.

[mirror_edk2.git] / IntelFrameworkPkg / Include / Ppi / S3Resume.h

diff --git a/IntelFrameworkPkg/Include/Ppi/S3Resume.h b/IntelFrameworkPkg/Include/Ppi/S3Resume.h
index d031018a7dd29af0b342cdf8c96fb6357a07149c..b04a62ab792c4ca0179fb3a778f9654e92d9b53f 100644 (file)
--- a/IntelFrameworkPkg/Include/Ppi/S3Resume.h
+++ b/IntelFrameworkPkg/Include/Ppi/S3Resume.h
@@ -1,6 +1,22 @@
 /** @file\r
-  This file declares S3 Resume PPI.\r
-\r
+  This file declares S3 Resume PPI which accomplishes the firmware S3 resume boot path\r
+  and transfers control to OS.\r
+  \r
+  This PPI is published by the S3 resume PEIM and can be used on the S3 resume boot path to\r
+  restore the platform to its preboot configuration and transfer control to OS. The information that is\r
+  required for an S3 resume can be saved during the normal boot path using\r
+  EFI_ACPI_S3_SAVE_PROTOCOL. This presaved information can then be restored in the S3\r
+  resume boot path using EFI_PEI_S3_RESUME_PPI. Architecturally, the S3 resume PEIM is the\r
+  last PEIM to be dispatched in the S3 resume boot path.\r
+  Before using this PPI, the caller has to ensure the necessary information for the S3 resume, such as\r
+  the following, is available for the S3 resume boot path:\r
+  - EFI_ACPI_S3_RESUME_SCRIPT_TABLE script table. Type\r
+    EFI_ACPI_S3_RESUME_SCRIPT_TABLE is defined in the Intel® Platform Innovation\r
+    Framework for EFI Boot Script Specification.\r
+  - OS waking vector.\r
+  - The reserved memory range to be used for the S3 resume.\r
+  Otherwise, the S3 resume boot path may fail.\r
+  \r
   Copyright (c) 2007, Intel Corporation\r
   All rights reserved. This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
@@ -21,6 +37,8 @@
 #ifndef __PEI_S3_RESUME_PPI_H__\r
 #define __PEI_S3_RESUME_PPI_H__\r
 \r
+#include <PiPei.h>\r
+\r
 #define EFI_PEI_S3_RESUME_PPI_GUID \\r
   { \\r
     0x4426CCB2, 0xE684, 0x4a8a, {0xAE, 0x40, 0x20, 0xD4, 0xB0, 0x25, 0xB7, 0x10 } \\r