= GIET-VM usage information =


== __A) Mapping_Info data structure__ ==

== __X) Peripherals__ ==

== __C) Shared kernel functions__ ==

The boot code and the kernel code are two separated compilation units, but some ''common'' functions can be used by both the boot code and the kernel code:

=== [wiki:kernel_utils C1) utility functions] ===

=== [wiki:kernel_pmem physical C2) memory allocators] ===

=== [wiki:kernel_vmem C4) virtual to physical address translation] ===

== __Y) Boot Code__ ==

== __W) Kernel functions__ ==

The GIET acronym stands for ''Gestionnaire Interruptions, Exceptions & Trappes''.

This section describe the kernel functions, supporting Interrupts, Exceptions and Traps (i.e. syscalls).

 === [wiki:kernel_interrupts W1) Interrupt Handler] ===

 === [wiki:kernel_exceptions W2) Exception Handler] ===

 === [wiki:kernel_syscalls W3) Syscall Handler] === 

 === [wiki:kernel_context context switchs] ===

== __Z) User level libraries__ ==

This section describes the user libraries :

 === [wiki:library_stdio stdio library] ===

This library contains all system calls allowing an application
to access a protected ressource (peripheral register, or protected processor register). 
Each function in this library contains at least one SYSCALL instruction to enter the kernel mode.

=== [wiki:library_stdlib stdlib library] ===

This library contains various utility functions that do not use system calls.

=== [wiki:library_mwmr MWMR library] ===

This library defines a communication middleware
supporting channelised communications in a multi-tasks parallel application.
This middleware does not use system calls.

=== [wiki:library_barrier barrier library] ===

This library contains functions used to synchronize
severals tasks in a multi-task parallel application. Most of these functions
do not use system calls.

=== [wiki:library_locks spin_lock library] ===

This library contains functions used to provide
exclusive access to a shared ressource in a multi-task parallel application. 
These functions do not use system calls.

=== [wiki:library_malloc malloc library] ===

This library contains functions allowing an user application
to dynamically allocate virtual memory from the application heap.
When the target architecture is clusterized (several physical banks), the heap
is physically distributed on the clusters, and there is actually on allocator per cluster.