1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* RV32 Supervisor-mode address translation and page-table walks. */
/* Define the architectural satp and its legalizer. */
register satp : xlenbits
function legalize_satp(a : Architecture, o : xlenbits, v : xlenbits) -> xlenbits =
legalize_satp32(a, o, v)
/* Compute the address translation mode. */
val translationMode : (Privilege) -> SATPMode effect {rreg, escape}
function translationMode(priv) = {
if priv == Machine then Sbare
else {
let arch = architecture(get_mstatus_SXL(mstatus));
match arch {
Some(RV32) => {
let s = Mk_Satp32(satp[31..0]);
if s.Mode() == 0b0 then Sbare else Sv32
},
_ => internal_error("unsupported address translation arch")
}
}
}
/* Top-level address translation dispatcher */
val translateAddr : (xlenbits, AccessType(ext_access_type)) -> TR_Result(xlenbits, ExceptionType) effect {escape, rmem, rreg, wmv, wmvt, wreg}
function translateAddr(vAddr, ac) = {
let effPriv : Privilege = match ac {
Execute() => cur_privilege,
_ => effectivePrivilege(mstatus, cur_privilege)
};
let mxr : bool = mstatus.MXR() == 0b1;
let do_sum : bool = mstatus.SUM() == 0b1;
let mode : SATPMode = translationMode(effPriv);
let asid = curAsid32(satp);
let ptb = curPTB32(satp);
/* PTW extensions: initialize the PTW extension state */
let ext_ptw : ext_ptw = init_ext_ptw;
match mode {
Sbare => TR_Address(vAddr, ext_ptw),
Sv32 => match translate32(asid, ptb, vAddr, ac, effPriv, mxr, do_sum, SV32_LEVELS - 1, ext_ptw) {
TR_Address(pa, ext_ptw) => TR_Address(to_phys_addr(pa), ext_ptw),
TR_Failure(f, ext_ptw) => TR_Failure(translationException(ac, f), ext_ptw)
},
_ => internal_error("unsupported address translation scheme")
}
}
val flush_TLB : (option(xlenbits), option(xlenbits)) -> unit effect {rreg, wreg}
function flush_TLB(asid_xlen, addr_xlen) -> unit = {
let asid : option(asid32) =
match (asid_xlen) {
None() => None(),
Some(a) => Some(a[8 .. 0])
};
flush_TLB32(asid, addr_xlen)
}
function init_vmem () -> unit = {
init_vmem_sv32()
}
|
