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execute1: Make mfspr/mtspr to SPRs 0,4,5,6 generate HEAI

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The ISA specifies that mfspr or mtspr to SPR 0, 4, 5 or 6 should
generate a hypervisor emulation assistance interrupt in privileged
mode, so this adds logic to do that.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2025-09-25 22:37:47 +10:00
parent 9c40ddffd2
commit 5548a5ba26
1 changed files with 11 additions and 7 deletions
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18
execute1.vhdl
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@@ -1216,6 +1216,7 @@ begin
variable owait : std_ulogic;
variable srr1 : std_ulogic_vector(63 downto 0);
variable c32, c64 : std_ulogic;
variable sprnum : spr_num_t;
begin
v := actions_type_init;
v.e.write_data := alu_result;
@@ -1424,14 +1425,15 @@ begin
when OP_DARN =>
when OP_MFMSR =>
when OP_MFSPR =>
sprnum := decode_spr_num(e_in.insn);
if e_in.spr_is_ram = '1' then
if e_in.valid = '1' and not is_X(e_in.insn) then
report "MFSPR to SPR " & integer'image(decode_spr_num(e_in.insn)) &
report "MFSPR to SPR " & integer'image(sprnum) &
"=" & to_hstring(alu_result);
end if;
elsif e_in.spr_select.valid = '1' and e_in.spr_select.wonly = '0' then
if e_in.valid = '1' and not is_X(e_in.insn) then
report "MFSPR to slow SPR " & integer'image(decode_spr_num(e_in.insn));
report "MFSPR to slow SPR " & integer'image(sprnum);
end if;
slow_op := '1';
if e_in.spr_select.noop = '1' then
@@ -1454,12 +1456,12 @@ begin
-- supervisor mode and a program or HEAI interrupt for user mode
-- LPCR[EVIRT] = 1 makes it HEAI in privileged mode
if e_in.valid = '1' and not is_X(e_in.insn) then
report "MFSPR to SPR " & integer'image(decode_spr_num(e_in.insn)) &
" invalid";
report "MFSPR to SPR " & integer'image(sprnum) & " invalid";
end if;
slow_op := '1';
v.e.write_enable := '0';
if ex1.msr(MSR_PR) = '1' or ctrl.lpcr_evirt = '1' then
if ex1.msr(MSR_PR) = '1' or ctrl.lpcr_evirt = '1' or
sprnum = 0 or sprnum = 4 or sprnum = 5 or sprnum = 6 then
illegal := '1';
end if;
end if;
@@ -1505,8 +1507,9 @@ begin
end if;
end if;
when OP_MTSPR =>
sprnum := decode_spr_num(e_in.insn);
if e_in.valid = '1' and not is_X(e_in.insn) then
report "MTSPR to SPR " & integer'image(decode_spr_num(e_in.insn)) &
report "MTSPR to SPR " & integer'image(sprnum) &
"=" & to_hstring(c_in);
end if;
v.se.write_pmuspr := e_in.spr_select.ispmu;
@@ -1548,7 +1551,8 @@ begin
-- mtspr to unimplemented SPRs should be a nop in
-- supervisor mode and a program interrupt or HEAI for user mode
-- LPCR[EVIRT] = 1 makes it HEAI in privileged mode
if ex1.msr(MSR_PR) = '1' or ctrl.lpcr_evirt = '1' then
if ex1.msr(MSR_PR) = '1' or ctrl.lpcr_evirt = '1' or
sprnum = 0 or sprnum = 4 or sprnum = 5 or sprnum = 6 then
illegal := '1';
end if;
end if;