Changes between Initial Version and Version 1 of kernel_cp0

Timestamp:

Oct 9, 2014, 10:28:13 AM (10 years ago)

Author:

alain

Comment:

--

kernel_cp0

@@ +1 @@
+= GIET-VM / CP0 access functions =
+
+[[PageOutline]]
+
+The [source:soft/giet_vm/giet_common/utils.c utils.c] and [source:soft/giet_vm/giet_common/utils.h util.h] files define kernel functions that are used both by the boot-loader and by the kernel. 
+They are prefixed by ''_'' to remind that they can only be executed by a processor in kernel mode.
+
+ === unsigned int _get_sched( void ) ===
+Returns the virtual address of the scheduler, stored in the CP0_SCHED register, for the processor running the calling task. 
+
+ === unsigned int _get_epc( void ) ===
+Returns the value stored in the CP0_EPC register, for the processor running the calling task.  
+
+ === unsigned int _get_cr( void ) ===
+Returns the value stored in the CP0_CR register, for the processor running the calling task. 
+
+ === unsigned int _get_sr( void ) ===
+Returns the value stored in the CP0_SR register, for the processor running the calling task. 
+
+ === unsigned int _get_bvar( void ) ===
+Returns the value stored in the CP0_BVAR register, for the processor running the calling task. 
+
+ === unsigned int _get_procid( void ) ===
+Returns the global processor identifier stored in the CP0_PROCID register for the processor running the calling task. 
+
+ === unsigned int _get_protime( void ) ===
+Returns the cycle count stored in the CP0_TIME register for the processor running the calling task. 
+
+ === void _set_sched( unsigned int value ) ===
+Writes ''value'' in the CP0_SCHED register, for the processor running the calling task. 
+
+ === void _set_sr( unsigned int value ) ===
+Writes ''value'' in the CP0_SR register, for the processor running the calling task. 
+
+ === void _it_disable( unsigned int* save_sr_ptr ) ===
+Disables interrupts for the processor running the calling task and save the CP0_SR value at address ''save_sr_ptr''.
+
+ === void _it_restore( unsigned int* save_sr_ptr ) ===
+Writes the value pointed by ''save_sr_ptr'' into the CP0_SR register, for the processor running the calling task.
+
+