Changes between Initial Version and Version 1 of kernel_miscelaneous

Timestamp:

Dec 7, 2014, 8:41:50 PM (10 years ago)

Author:

alain

Comment:

--

kernel_miscelaneous

@@ +1 @@
+= GIET-VM / Miscelaneous common kernel functions =
+
+[[PageOutline]]
+
+The [source:soft/giet_vm/giet_common/utils.c utils.c] and [source:soft/giet_vm/giet_common/utils.h utils.h] files define various kernel functions that can be used by both the kernel code and the boot code.
+
+=== void '''_exit'''(void) ===
+This function is called in case of kernel error.
+The processor try to displays an error message on TTY0, and suicide (enter infinite loop)...
+
+=== void '''_random_wait'''( unsigned int value ) ===
+This function implements a pseudo-random delay.
+The 5 LSB bits of the '''value''' argument (number between 0 and 31) define the average delay value: 2 * (2**(value[4:0]
+
+=== void '''_break'''( char* str ) ===
+This function can be used for interactive kernel debug. It displays the '''str''' string on TTY0,
+and waits until a character typed on TTY0.
+
+=== unsigned int '''_strncmp'''( const char*  s1, const char*  s2,  unsigned int n );
+This function compares the '''n''' first characters of the two '''s1''' and '''s2''' strings.
+Returns 0 if all characters are identical. returns 1 otherwise.
+
+=== char* '''_strcpy'''( char* dest,  char* source ) ===
+This function copies the '''source''' string to the '''dest''' string, and returns a pointer on the '''dest''' string. 
+
+=== void '''_dcache_buf_invalidate'''( unsigned int buf_vbase,  unsigned int buf_size ) ===
+This function invalidates all cache lines contained in the L1 data cache that overlap the buffer defined by
+the '''buf_vbase''' and '''buf_size''' arguments.
+