From: lkcl Date: Sat, 19 Dec 2020 01:56:07 +0000 (+0000) Subject: (no commit message) X-Git-Tag: convert-csv-opcode-to-binary~1203 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4811f0aa1276102dadebf33e1e37d39bc87b368d;p=libreriscv.git --- diff --git a/openpower/sv/sprs.mdwn b/openpower/sv/sprs.mdwn index 957bebbf1..7430f1be3 100644 --- a/openpower/sv/sprs.mdwn +++ b/openpower/sv/sprs.mdwn @@ -6,24 +6,18 @@ There are five CSRs, available in any privilege level: * VL (which has different characteristics from standard CSRs) * SUBVL (effectively a kind of SIMD) * STATE (containing copies of MVL, VL and SUBVL as well as context information) -* PCVBLK (the current operation being executed within a VBLOCK Group) For Privilege Levels (trap handling) there are the following CSRs, -where x may be u, m, s or h for User, Machine, Supervisor or Hypervisor +where x may be u, s or h for User, Supervisor or Hypervisor Modes respectively: -* (x)ePCVBLK (a copy of the sub-execution Program Counter, that is relative - to the start of the current VBLOCK Group, set on a trap). * (x)eSTATE (useful for saving and restoring during context switch, and for providing fast transitions) -The u/m/s CSRs are treated and handled exactly like their (x)epc +The u/s CSRs are treated and handled exactly like their (x)epc equivalents. On entry to or exit from a privilege level, the contents of its (x)eSTATE are swapped with STATE. -(x)EPCVBLK CSRs must be treated exactly like their corresponding (x)epc -equivalents. See VBLOCK section for details. - ## MAXVECTORLENGTH (MVL) MAXVECTORLENGTH is the same concept as MVL in RVV, except that it @@ -67,9 +61,15 @@ full context save/restore. It contains (and permits setting of): The format of the STATE CSR is as follows: -| (31..28) | (27..26) | (25..24) | (23..18) | (17..12) | (11..6) | (5...0) | -| -------- | -------- | -------- | -------- | -------- | ------- | ------- | -| rsvd | dsvoffs | subvl | destoffs | srcoffs | vl | maxvl | +| Field | Name | Description | +| ----- | -------- | --------------------- | +| 0:6 | maxvl | | +| 7:13 | vl | | +| 14:20 | srcoffs | | +| 21:27 | dstoffs | | +| 28:29 | subvl | | +| 30:31 | dsvoffs | | + The relationship between SUBVL and the subvl field is: