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re-org ems mem allocator source codes, update prot_wamr.md (#217)

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@ -3,14 +3,14 @@ WAMR porting guide
=========================
This document describes how to port WAMR to a new platform "**super-os**"
This document describes how to port WAMR to a new platform "**new-os**"
# Step 1: Implement platform API layer
-------------------------
Firstly create the folder **`core/shared/platform/super-os`** for platform API layer implementations. In the folder you just created, you must provide the following files:
Firstly create the folder **`core/shared/platform/new-os`** for platform API layer implementations. In the folder you just created, you must provide the following files:
- `platform_internal.h`: It can be used for any platform specific definitions such as macros, data types and internal APIs.
@ -42,11 +42,11 @@ Some platforms such as ZephyrOS don't provide math functions e.g. sqrt, fabs and
# Step 2: Create the mini product for the platform
-------------------------
You can build a mini WAMR product which is only the vmcore for you platform. Normally you need to implement the main function which loads a WASM file and run it with the WASM runtime. You don't have to do this step if there is no such need for your platform.
You can build a mini WAMR product which is only the vmcore for you platform. Normally you need to implement the main function which loads a WASM file and run it with the WASM runtime. You don't have to do this step if there is no mini-product need for your platform porting.
Firstly create folder **product-mini/platforms/super-os** for the platform mini product build, then refer to the linux platform mini-product for creating the CMakeList.txt and the C implementations.
Firstly create folder **product-mini/platforms/new-os** for the platform mini product build, then refer to the linux platform mini-product for creating the CMakeList.txt and the C implementations.