Changes between Initial Version and Version 1 of iob_driver

Timestamp:

Oct 8, 2014, 6:23:53 PM (10 years ago)

Author:

alain

Comment:

--

iob_driver

@@ +1 @@
+= GIET-VM / IOB Driver = 
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+[[PageOutline]]
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+The [source:soft/giet_vm/giet_drivers/iob_driver.c iob_driver.c] and [source:soft/giet_vm/giet_drivers/iob_driver.h iob_driver.h] files define the IO driver. 
+
+This ''vci_io_bridge'' component is a bridge allowing software to send configuration requests to external peripherals, and allowing external peripherals with a DMA capability to directly access the L3 cache (or external memory without passing through the L2 caches. This ''vci_io_bridge'' implement an IOMMU using a dedicated IOMMU page table.
+
+This component should be implemented in the cluster specified by the (X_IO / Y_IO) variables in the hard_config.h file, and
+the physical base address is (cluster_io << 32) | SEG_IOB_BASE. The SEG_IOB_BASE virtual addresses must be defined in hard_config.h file.
+
+The addressables registers map, and the error codes are defined [source:soft/giet_vm/giet_drivers/iob_driver.h here].
+
+ === void '''_iob_inval_tlb_entry'''( unsigned int cluster_xy,  unsigned int vaddr ) ===
+This function invalidates a TLB entry identified by a virtual address, in the IOMMU.
+
+ === void '''_iob_set_iommu_ptpr'''(  unsigned int cluster_xy,  unsigned int value ) ===
+This function sets a new value in IOB_IOMMU_PTPR register.
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