= GIET-VM documentation =

[[PageOutline]]

== __A) Mapping_Info data structure__ ==

== __B) Peripherals Drivers__ ==

 === [wiki:bdv_driver     BDV  (Block Device controller)]
 
 === [wiki:cma_driver     CMA (Chained Buffer DMA controller)]

 === [wiki:dma_driver     DMA (Multi-Channels DMA controller)]

 === [wiki:fbf_driver     FBF (Frame Buffer controller)]

 === [wiki:hba_driver     HBA (AHCI Disk controller)]

 === [wiki:icu_driver     ICU (Interrupt controller)]

 === [wiki:iob_driver     IOB (I/O Bridge controller)]

 === [wiki:ioc_driver     IOC (Generic I/O controller)]

 === [wiki:mmc_driver     MMC (Memory Cache controller)]

 === [wiki:nic_driver     NIC (Gigabit Ethernet Network controller)]

 === [wiki:pic_driver     PIC (External Peripherals Interrupt controller)]

 === [wiki:sim_driver     SIM (Monitor controller)]

 === [wiki:spi_driver     SPI (SPI Disk controller)]

 === [wiki:tim_driver     TIM (Multi Timers controller)]

 === [wiki:tty_driver     TTY (Multi Terminals TTY controller)]

 === [wiki:xcu_driver     XCU (Extended Interrupt controller)]

== __C) Shared kernel functions__ ==

The boot code and the kernel code are two separated compilation units, but some functions are used by both the boot code and the kernel code:
 * They are used by the boot-loader in the ''static'' phase, to build the page tables and initialize the schedulers and the peripherals.
 * They are used by the kernel in the ''dynamic'' phase, to handle events such as interrupts, exceptions and syscalls. 

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

=== [wiki:kernel_cp0 CP0 registers access] ===

=== [wiki:kernel_cp2 CP2 registers access] ===

=== [wiki:kernel_paddr Physical addressing] ===

=== [wiki:kernel_locks Locks access] ===

=== [wiki:kernel_tty0 TTY access] ===

=== [wiki:kernel_context Tasks context access] ===

=== [wiki:kernel_pmem Physical memory allocators] ===

=== [wiki:kernel_vmem Virtual to physical address translation] ===

== __Y) Boot-loader functions__ ==

== __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 W4) Context Switch Handler] ===

== __Z) User level libraries__ ==

This section describes the user libraries :

 === [wiki:library_stdio Z1) 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 Z2) stdlib library] ===

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

=== [wiki:library_mwmr Z3) 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 Z4) 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 Z5) 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 Z6) 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.