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target/mips: Add CP0 PWCtl register 

Add PWCtl register (CP0 Register 5, Select 6).

The PWCtl register configures hardware page table walking for TLB
refills.

This register is required for the hardware page walker feature. It
exists only if Config3 PW bit is set to 1. It contains following
fields:

PWEn     (31)   - Hardware Page Table walker enable
PWDirExt (30)   - If 1, 4-th level implemented (MIPS64 only)
XK       (28)   - If 1, walker handles xkseg (MIPS64 only)
XS       (27)   - If 1, walker handles xsseg (MIPS64 only)
XU       (26)   - If 1, walker handles xuseg (MIPS64 only)
DPH      (7)    - Dual Page format of Huge Page support
HugePg   (6)    - Huge Page PTE supported in Directory levels
PSn      (5..0) - Bit position of PTEvld in Huge Page PTE

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Yongbok Kim <yongbok.kim@mips.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
Yongbok Kim 2018-10-09 17:40:40 +02:00 committed by Aleksandar Markovic
parent 20b28ebc49
commit 103be64c26
5 changed files with 45 additions and 2 deletions
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11
target/mips/cpu.h
View File

@ -446,6 +446,17 @@ struct CPUMIPSState {
* CP0 Register 6
*/
int32_t CP0_Wired;
int32_t CP0_PWCtl;
#define CP0PC_PWEN 31
#if defined(TARGET_MIPS64)
#define CP0PC_PWDIREXT 30
#define CP0PC_XK 28
#define CP0PC_XS 27
#define CP0PC_XU 26
#endif
#define CP0PC_DPH 7
#define CP0PC_HUGEPG 6
#define CP0PC_PSN 0 /* 5..0 */
int32_t CP0_SRSConf0_rw_bitmask;
int32_t CP0_SRSConf0;
#define CP0SRSC0_M 31

1
target/mips/helper.h
View File

@ -129,6 +129,7 @@ DEF_HELPER_2(mtc0_srsconf2, void, env, tl)
DEF_HELPER_2(mtc0_srsconf3, void, env, tl)
DEF_HELPER_2(mtc0_srsconf4, void, env, tl)
DEF_HELPER_2(mtc0_hwrena, void, env, tl)
DEF_HELPER_2(mtc0_pwctl, void, env, tl)
DEF_HELPER_2(mtc0_count, void, env, tl)
DEF_HELPER_2(mtc0_entryhi, void, env, tl)
DEF_HELPER_2(mttc0_entryhi, void, env, tl)

5
target/mips/machine.c
View File

@ -212,8 +212,8 @@ const VMStateDescription vmstate_tlb = {
const VMStateDescription vmstate_mips_cpu = {
.name = "cpu",
.version_id = 14,
.minimum_version_id = 14,
.version_id = 15,
.minimum_version_id = 15,
.post_load = cpu_post_load,
.fields = (VMStateField[]) {
/* Active TC */
@ -260,6 +260,7 @@ const VMStateDescription vmstate_mips_cpu = {
VMSTATE_UINTTL(env.CP0_PWField, MIPSCPU),
VMSTATE_UINTTL(env.CP0_PWSize, MIPSCPU),
VMSTATE_INT32(env.CP0_Wired, MIPSCPU),
VMSTATE_INT32(env.CP0_PWCtl, MIPSCPU),
VMSTATE_INT32(env.CP0_SRSConf0, MIPSCPU),
VMSTATE_INT32(env.CP0_SRSConf1, MIPSCPU),
VMSTATE_INT32(env.CP0_SRSConf2, MIPSCPU),

10
target/mips/op_helper.c
View File

@ -1527,6 +1527,16 @@ void helper_mtc0_wired(CPUMIPSState *env, target_ulong arg1)
}
}
void helper_mtc0_pwctl(CPUMIPSState *env, target_ulong arg1)
{
#if defined(TARGET_MIPS64)
/* PWEn = 0. Hardware page table walking is not implemented. */
env->CP0_PWCtl = (env->CP0_PWCtl & 0x000000C0) | (arg1 & 0x5C00003F);
#else
env->CP0_PWCtl = (arg1 & 0x800000FF);
#endif
}
void helper_mtc0_srsconf0(CPUMIPSState *env, target_ulong arg1)
{
env->CP0_SRSConf0 |= arg1 & env->CP0_SRSConf0_rw_bitmask;

20
target/mips/translate.c
View File

@ -6151,6 +6151,11 @@ static void gen_mfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_SRSConf4));
rn = "SRSConf4";
break;
case 6:
check_pw(ctx);
gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_PWCtl));
rn = "PWCtl";
break;
default:
goto cp0_unimplemented;
}
@ -6867,6 +6872,11 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
gen_helper_mtc0_srsconf4(cpu_env, arg);
rn = "SRSConf4";
break;
case 6:
check_pw(ctx);
gen_helper_mtc0_pwctl(cpu_env, arg);
rn = "PWCtl";
break;
default:
goto cp0_unimplemented;
}
@ -7592,6 +7602,11 @@ static void gen_dmfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_SRSConf4));
rn = "SRSConf4";
break;
case 6:
check_pw(ctx);
gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_PWCtl));
rn = "PWCtl";
break;
default:
goto cp0_unimplemented;
}
@ -8290,6 +8305,11 @@ static void gen_dmtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
gen_helper_mtc0_srsconf4(cpu_env, arg);
rn = "SRSConf4";
break;
case 6:
check_pw(ctx);
gen_helper_mtc0_pwctl(cpu_env, arg);
rn = "PWCtl";
break;
default:
goto cp0_unimplemented;
}