diff options
Diffstat (limited to 'model/riscv_ext_regs.sail')
| -rw-r--r-- | model/riscv_ext_regs.sail | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/model/riscv_ext_regs.sail b/model/riscv_ext_regs.sail index 9ff83b3..d9674f7 100644 --- a/model/riscv_ext_regs.sail +++ b/model/riscv_ext_regs.sail @@ -10,5 +10,22 @@ This function is called after above when running rvfi and allows the model to be initialised differently (e.g. CHERI cap regs are initialised to omnipotent instead of null). */ -val ext_rvfi_init : unit -> unit effect {wreg} -function ext_rvfi_init () = () +val ext_rvfi_init : unit -> unit effect {rreg, wreg} +function ext_rvfi_init () = { + x1 = x1 // to avoid hook being optimized out +} + + +/*! +THIS(csrno, priv, isWrite) allows an extension to block access to csrno, +at Privilege level priv. It should return true if the access is allowed. +*/ +val ext_check_CSR : (bits(12), Privilege, bool) -> bool +function ext_check_CSR (csrno, p, isWrite) = true + +/*! +THIS is called if ext_check_CSR returns false. It should +cause an appropriate RISCV exception. + */ +val ext_check_CSR_fail : unit->unit +function ext_check_CSR_fail () = () |