6 commits

Author	SHA1	Message	Date
Tom Roberts	f190e3abe4	[rtl] Fix PMP NA4 address matching ... - Split out address matching into less than, greater than and equals to correctly match NAPOT, NA4 and TOR modes. - Relates to #902 Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>	2020-06-02 13:41:03 +01:00
Tom Roberts	344279906f	[rtl] Fix PMP address matching ... - For TOR matching, match should be range_low <= addr < range_high - Adapt masking so TOR matching can still be reused for NAPOT matching - Relates to #864 Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>	2020-05-26 09:33:50 +01:00
Tom Roberts	ea2ffe82f1	[rtl/pmp] Fix PMP error prioritization ... - Region matches should be prioritized from 0 - N as stated in the RISCV Privileged Spec v1.11 Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>	2020-03-27 16:43:35 +00:00
Tom Roberts	f35db04b7c	[RTL PMP] Fix address matching bugs ... - Partial matching not relevant for 32bit only accesses - Apply region size masking correctly	2019-10-03 10:41:29 +01:00
Tom Roberts	2aacd2b98b	[Priv modes] Add support for U-Mode ... - General changes to suport U-mode (fixes #88) - Update documentation - Add priv mode flops to CSRs module - Propagate correct priv mode to PMP module - Implement CSR priv-mode permission checking - Implement illegal U-mode instruction checking - Add extra mstatus bits for U-mode (MPRV and TW)	2019-10-03 10:41:29 +01:00
Tom Roberts	892ad8a621	[RTL] - Add PMP module ... - Instantiate generic PMP module - Wire up I-side and D-side PMP faults - The output of the PMP check is used to gate external bus requests from the I-side and LSU - Each of those units progresses with their request as-if it was granted externally and registers the PMP error - The error is then sent to the controller at the appropriate time to trigger an exception	2019-08-29 17:43:37 +01:00