diff options
Diffstat (limited to 'c')
| -rw-r--r-- | c/src/lib/libbsp/sparc/ChangeLog | 8 | ||||
| -rw-r--r-- | c/src/lib/libbsp/sparc/shared/bspstart.c | 29 |
2 files changed, 37 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/sparc/ChangeLog b/c/src/lib/libbsp/sparc/ChangeLog index 32348679c5..76ac229f1d 100644 --- a/c/src/lib/libbsp/sparc/ChangeLog +++ b/c/src/lib/libbsp/sparc/ChangeLog @@ -1,5 +1,13 @@ 2007-09-05 Daniel Hellstrom <daniel@gaisler.com> + * shared/bspstart.c: LEON2 and LEON3 Data cache snooping detection on + startup, for drivers. (LEON2,3 are configurable processors, they can + be with or without DCache snooping. Caches without snooping needs the + drivers to flush cache or use the sparc instruction lda to force + cache miss...) + +2007-09-05 Daniel Hellstrom <daniel@gaisler.com> + * shared/amba/ambapp.c, shared/include/ambapp.h: New files. 2007-09-05 Daniel Hellstrom <daniel@gaisler.com> diff --git a/c/src/lib/libbsp/sparc/shared/bspstart.c b/c/src/lib/libbsp/sparc/shared/bspstart.c index 17b3cfe74c..2ccd3a750f 100644 --- a/c/src/lib/libbsp/sparc/shared/bspstart.c +++ b/c/src/lib/libbsp/sparc/shared/bspstart.c @@ -47,6 +47,14 @@ rtems_cpu_table Cpu_table; extern uint32_t rdb_start; +#ifdef LEON2 +/* + * Tells us if data cache snooping is available + */ + +int CPU_SPARC_HAS_SNOOPING; +#endif + /* * Use the shared implementations of the following routines */ @@ -55,6 +63,23 @@ void bsp_postdriver_hook(void); void bsp_libc_init( void *, uint32_t, int ); extern void bsp_spurious_initialize(); +#ifdef LEON2 +/* + * set_snooping + * + * Read the data cache configuration register to determine if + * bus snooping is available. This is needed for some drivers so + * that they can select the most efficient copy routines. + * + */ + +static inline int set_snooping(void) +{ + unsigned int tmp = *(unsigned int *)0x80000014; /* Cache control register */ + return ((tmp>>23) & 1); /* Data cache snooping enabled */ +} +#endif + /* * bsp_pretasking_hook * @@ -118,4 +143,8 @@ void bsp_start( void ) } BSP_Configuration.work_space_start = work_space_start; + + #ifdef LEON2 + CPU_SPARC_HAS_SNOOPING = set_snooping(); + #endif } |