Cosmos/Docs/Kernel/Memory.md

Layout

F..F Stack Currently only one stack as we don't have threads yet. Stack resides at top of RAM and grows down. .... Data

Text Syslinux Boot Code Cosmos Boot Code Kernel Apps (Monolithic currently) 0..0

OLD BELOW THIS POINT

On initialization of the kernel, a GlobalInformationTable is setup. This contains the address of the first DataLookupEntry

The Memory Manager

The manager will init itself if there are no blocks. The manager is modeled after a double LinkedList and is not a List.

Memory Layout

The layout does not have a preset list or table but rather every item has meta data linking the next and previous item. This allows for a robust system.

The data layout is as follows:

Block|Block|Block etc.

Block =

Meta Data|Data

Meta data =
4 bytes (preveus block address start)|4 bytes (next block address start)|4 bytes (curent[this] block size)| 4 bytes (curent[this] block flag)
```
BlockFlags :

```
Allocated = 0,
Free = 1,
```

the final layout looks like this:

```
4 bytes|4 bytes|4 bytes|4 bytes | (size of Block) bytes  |  4 bytes|4 bytes|4 bytes | 4 bytes | (size of Block) bytes  | etc

```
Note:
this means the smallest size an Block can occupy is 17 bytes, 16 bytes for the header and 1 for the smallest data type a byte.

# Usage

### Allocation
  Allocating a block happens by finding the first free block and split it (if necessary).

## Deallocation
  Freeing a block is easy set its flag (in the metadata) to free.