opensbi.git/lib/utils/fdt, branch v0.8

platform: Add support for Shakti C-class SoC from IIT-M

2020-06-19T03:51:46Z

C-Class is a member of the SHAKTI family of processors from Indian Institute of Technology - Madras(IIT-M). It is an extremely configurable and commercial-grade 5-stage in-order core supporting the standard RV64GCSUN ISA extensions. https://gitlab.com/shaktiproject/cores/c-class/blob/master/README.md We add OpenSBI support for Shakti C-class SoC. Signed-off-by: Vijai Kumar K Reviewed-by: Anup Patel

platform/lib: Allow the OS to map the regions that are protected by PMP

2020-06-15T03:55:44Z

This is achieved by removing the 'no-map' property from the 'reserved-memory' node when PMP is present, otherwise we keep it as it offers a small protection if the OS does not map this region at all. A new callback in platform_override is introduced and allows to fixup the device-tree. It is used here to override this new default behaviour on SiFive Fu540 platforms that has an erratum that prevents S-mode software to access a PMP protected region using 1GB page table mapping. If PMP is present, telling the OS not to map the reserved regions does not add much protection since it only avoids access to regions that are already protected by PMP. But by not allowing the OS to map those regions, it creates holes in the OS system memory map and prevents the use of hugepages which would generate, among other benefits, less TLB miss. Signed-off-by: Alexandre Ghiti Reviewed-by: Atish Patra Reviewed-by: Anup Patel

lib: utils: Add fdt_parse_clint_node() function

2020-05-23T05:06:46Z

We add fdt_parse_clint_node() function which will be used by fdt_ipi_clint and fdt_timer_clint drivers to parse CLINT details from DT node. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils: Extend fdt_find_match() Implementation

2020-05-23T05:06:33Z

We extend fdt_find_match() implementation by adding node offset parameter which represents the first node to match from. The improved fdt_find_match() can be used to find multiple match nodes. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils: Allow PLIC functions to be used for multiple PLICs

2020-05-23T05:06:29Z

We extend all PLIC functions to have a "struct plic_data *" parameter pointing to PLIC details. This allows platforms to use these functions for multiple PLIC instances. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi_hart: Detect number of supported PMP regions

2020-05-19T03:49:48Z

It is not mandatory for a RISC-V systems to implement all PMP regions so we have to check all PMPADDRx CSRs to determine excat number of supported PMP regions. Signed-off-by: Anup Patel

include: sbi: Use scratch pointer as parmeter in HART feature APIs

2020-05-19T03:49:42Z

It makes more sense to have scratch pointer as parameter in HART feature APIs because: 1. We already have scratch pointer at places where these APIs are used. 2. This is consistent with lot of other APIs in sbi_hart.h Signed-off-by: Anup Patel Reviewed-by: Atish Patra

platform: Move platform features to hart

2020-05-10T04:35:41Z

PMP & performance counters belong to a hart rather than a platform. In addition to that, these features enable reading/writing from a particular csr. Thus, they can be detected and set at runtime rather than compile time. Move PMP/MCOUNTEREN/SCOUNTEREN features to hart and detect them at runtime. Signed-off-by: Atish Patra Tested-by: Jonathan Balkind Reviewed-by: Anup Patel

lib: utils: Update reserved memory fdt node even if PMP is not present

2020-05-10T04:30:02Z

As per RISC-V ISA, pmp is not mandatory. Currently, we only add reserved memory node in DT only if PMP is present. That allows supervisor to access the memory where OpenSBI continue to exist without realizing it for non-pmp based platforms. It may result in corrupting OpenSBI. That's why OpenSBI should at least let the supervisor know where it continue to exist. This a best effort service provided by OpenSBI expecting that supervisor software is not buggy and properly sets up its memory after parsing the reserved-memory device tree node. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: utils: Add fdt_parse_plic_node() function

2020-05-01T04:15:53Z

We add fdt_parse_plic_node() function which will allow us to parse a particular DT node as PLIC node. This will be useful in parsing the DT node which we have found by matching compatible string. Signed-off-by: Anup Patel Reviewed-by: Atish Patra