Changes between Initial Version and Version 1 of kernel_paddr

Timestamp:

Oct 9, 2014, 12:45:11 PM (10 years ago)

Author:

alain

Comment:

--

kernel_paddr

@@ +1 @@
+= GIET-VM / Physical addressing 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 the functions supporting physical addressing, using the CP2_PADDR_EXT register. 
+Physical addresses can have up to 64 bits.
+
+They are prefixed by "_" to remind that they can only be executed by a processor in kernel mode.
+
+ === unsigned int _physical_read( unsigned long long paddr ) ===
+Returns the 32 bits word stored at physical address ''paddr'', after a temporary DTLB deactivation.
+It uses the CP2_PADDR_EXT register.
+
+ === void _physical_write( unsigned long long paddr, unsigned int value )
+Writes the 32 bits word ''value'' at physical address ''paddr'', after a temporary DTLB deactivation.
+It uses the CP2_PADDR_EXT register.
+
+ === unsigned long long _physical_read_ull( unsigned long long paddr ) ===
+Returns the 64 bits word stored at physical address ''paddr'', after a temporary DTLB deactivation.
+It uses the CP2_PADDR_EXT register.
+
+ === void _physical_write_ull( unsigned long long paddr, unsigned long long value ) ===
+Writes the 64 bits word ''value'' at physical address ''paddr'', after a temporary DTLB deactivation.
+It uses the CP2_PADDR_EXT register.
+
+ === void _physical_memcpy( unsigned long long dst_paddr, unsigned long long src paddr, unsigned int size ) ===
+This function makes a memcpy from a source buffer to a destination buffer, using physical addresses, after a temporary DTLB de-activation. The ''src_paddr'', ''dst_paddr'' and ''size'' arguments must be multiple of 4 bytes. 
+
+ === unsigned int _io_extended_read( unsigned int* vaddr ) ===
+This function is used by the GIET-VM drivers to read a 32 bits word in a peripheral register.
+If the MMU is not activated, the virtual address is extended using X_IO and Y_IO (defined in the hard-config.h file) to reach the cluster_io.
+
+ === void _io_extended_write( unsigned int* vaddr, unsigned int value ) ===
+This function is used by the GIET-VM drivers to write a 32 bits word in a peripheral register.
+If the MMU is not activated, the virtual address is extended using X_IO and Y_IO (defined in the hard-config.h file) to reach the cluster_io.