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+# Intel Common Code Block Publishing EFI_MP_SERVICES_PPI
+
+## Introduction
+
+This documentation is intended to document the purpose for creating EFI service
+Interface inside coreboot space to perform CPU feature programming on Application
+Processors for Intel 9th Gen (Cannon Lake) and beyond CPUs.
+
+Today coreboot is capable enough to handle multi-processor initialization on IA platforms.
+
+The multi-processor initialization code has to take care of lots of duties:
+
+1 Bringing all cores out of reset
+2 Load latest microcode on all cores
+3 Sync latest MTRR snapshot between BSP and APs
+4 Perform sets of CPU feature programming
+  * CPU Power & Thermal Management
+  * Overclocking
+  * Intel Trusted Execution Technology
+  * Intel Software Guard Extensions
+  * Intel Processor Trace etc.
+
+This above CPU feature programming lists are expected to grow with current and future
+CPU complexity and there might be some cases where certain feature programming mightbe
+closed source in nature.
+
+Platform code might need to compromise on those closed source nature of CPU programming
+if we don't plan to provide an alternate interface which can be used by coreboot to
+get-rid of such close source CPU programming.
+
+## Proposal
+
+As coreboot is doing CPU multi-processor initialization for IA platform before FSP-S
+initialization and having all possible information about cores in terms of maximum number
+of cores, APIC ids, stack size etc. It’s also possible for coreboot to extend its own
+support model and create a sets of APIs which later can be used by FSP to run CPU feature
+programming using coreboot published APIs.
+
+Due to the fact that FSP is using EFI infrastructure and need to relying on install/locate
+PPI to perform certain API call, hence coreboot has to created MP services APIs known as
+EFI_MP_SERVICES_PPI as per PI specification volume 1, section 8.3.9.
+More details here: http://www.uefi.org/sites/default/files/resources/PI_Spec_1_6.pdf
+
+### coreboot to publish EFI_MP_SERVICES_PPI APIs
+| API                          | Description                                                      |
+|------------------------------|------------------------------------------------------------------|
+| PeiGetNumberOfProcessors     | Get the number of CPU's.                                         |
+| PeiGetProcessorInfo          | Get information on a specific CPU.                               |
+| PeiStartupAllAPs             | Activate all of the application processors.                      |
+| PeiStartupThisAP             | Activate a specific application processor.                       |
+| PeiSwitchBSP                 | Switch the boot strap processor.                                 |
+| PeiEnableDisableAP           | Enable or disable an application processor.                      |
+| PeiWhoAmI                    | Identify the currently executing processor.                      |
+|------------------------------|------------------------------------------------------------------|
+
+
+## Code Flow
+
+Here is proposed design flow with coreboot has implemented EFI_MP_SERVICES_PPI API and FSP will make
+use of the same to perform some CPU feature programming.
+
+** coreboot-FSP MP init flow **
+![alt text][coreboot_publish_mp_service_api]
+
+[coreboot_publish_mp_service_api]: coreboot_publish_mp_service_api.png "coreboot-fsp mp init flow"
+
+## Benefits
+1. coreboot was using SkipMpInit=1 which will skip entire FSP CPU feature programming.
+With proposed model, coreboot will make use of SkipMpInit=0 which will allow to run all
+Silicon recommended CPU programming.
+2. CPU feature programming inside FSP will be more transparent than before as it’s using
+coreboot interfaces to execute those programming.
+3. coreboot will have more control over running those feature programming as API optimization
+handled by coreboot.
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