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target-arm: Convert generic timer reginfo to accessfn 

Convert the reginfo structs for the generic timer registers
to use access functions rather than returning EXCP_UDEF from
their read handlers. In some cases this allows us to remove
a read handler completely.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Maydell 2014-02-20 10:35:53 +00:00
parent fcd252062a
commit 00108f2d4d
1 changed files with 66 additions and 56 deletions
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122
target-arm/helper.c
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@ -743,6 +743,59 @@ static const ARMCPRegInfo v6k_cp_reginfo[] = {
#ifndef CONFIG_USER_ONLY
static CPAccessResult gt_cntfrq_access(CPUARMState *env, const ARMCPRegInfo *ri)
{
/* CNTFRQ: not visible from PL0 if both PL0PCTEN and PL0VCTEN are zero */
if (arm_current_pl(env) == 0 && !extract32(env->cp15.c14_cntkctl, 0, 2)) {
return CP_ACCESS_TRAP;
}
return CP_ACCESS_OK;
}
static CPAccessResult gt_counter_access(CPUARMState *env, int timeridx)
{
/* CNT[PV]CT: not visible from PL0 if ELO[PV]CTEN is zero */
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, timeridx, 1)) {
return CP_ACCESS_TRAP;
}
return CP_ACCESS_OK;
}
static CPAccessResult gt_timer_access(CPUARMState *env, int timeridx)
{
/* CNT[PV]_CVAL, CNT[PV]_CTL, CNT[PV]_TVAL: not visible from PL0 if
* EL0[PV]TEN is zero.
*/
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, 9 - timeridx, 1)) {
return CP_ACCESS_TRAP;
}
return CP_ACCESS_OK;
}
static CPAccessResult gt_pct_access(CPUARMState *env,
const ARMCPRegInfo *ri)
{
return gt_counter_access(env, GTIMER_PHYS);
}
static CPAccessResult gt_vct_access(CPUARMState *env,
const ARMCPRegInfo *ri)
{
return gt_counter_access(env, GTIMER_VIRT);
}
static CPAccessResult gt_ptimer_access(CPUARMState *env, const ARMCPRegInfo *ri)
{
return gt_timer_access(env, GTIMER_PHYS);
}
static CPAccessResult gt_vtimer_access(CPUARMState *env, const ARMCPRegInfo *ri)
{
return gt_timer_access(env, GTIMER_VIRT);
}
static uint64_t gt_get_countervalue(CPUARMState *env)
{
return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / GTIMER_SCALE;
@ -788,17 +841,6 @@ static void gt_recalc_timer(ARMCPU *cpu, int timeridx)
}
}
static int gt_cntfrq_read(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t *value)
{
/* Not visible from PL0 if both PL0PCTEN and PL0VCTEN are zero */
if (arm_current_pl(env) == 0 && !extract32(env->cp15.c14_cntkctl, 0, 2)) {
return EXCP_UDEF;
}
*value = env->cp15.c14_cntfrq;
return 0;
}
static void gt_cnt_reset(CPUARMState *env, const ARMCPRegInfo *ri)
{
ARMCPU *cpu = arm_env_get_cpu(env);
@ -810,29 +852,10 @@ static void gt_cnt_reset(CPUARMState *env, const ARMCPRegInfo *ri)
static int gt_cnt_read(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t *value)
{
int timeridx = ri->opc1 & 1;
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, timeridx, 1)) {
return EXCP_UDEF;
}
*value = gt_get_countervalue(env);
return 0;
}
static int gt_cval_read(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t *value)
{
int timeridx = ri->opc1 & 1;
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, 9 - timeridx, 1)) {
return EXCP_UDEF;
}
*value = env->cp15.c14_timer[timeridx].cval;
return 0;
}
static int gt_cval_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
@ -847,10 +870,6 @@ static int gt_tval_read(CPUARMState *env, const ARMCPRegInfo *ri,
{
int timeridx = ri->crm & 1;
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, 9 - timeridx, 1)) {
return EXCP_UDEF;
}
*value = (uint32_t)(env->cp15.c14_timer[timeridx].cval -
gt_get_countervalue(env));
return 0;
@ -867,19 +886,6 @@ static int gt_tval_write(CPUARMState *env, const ARMCPRegInfo *ri,
return 0;
}
static int gt_ctl_read(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t *value)
{
int timeridx = ri->crm & 1;
if (arm_current_pl(env) == 0 &&
!extract32(env->cp15.c14_cntkctl, 9 - timeridx, 1)) {
return EXCP_UDEF;
}
*value = env->cp15.c14_timer[timeridx].ctl;
return 0;
}
static int gt_ctl_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
@ -924,7 +930,7 @@ static const ARMCPRegInfo generic_timer_cp_reginfo[] = {
.access = PL1_RW | PL0_R,
.fieldoffset = offsetof(CPUARMState, cp15.c14_cntfrq),
.resetvalue = (1000 * 1000 * 1000) / GTIMER_SCALE,
.readfn = gt_cntfrq_read, .raw_readfn = raw_read,
.accessfn = gt_cntfrq_access,
},
/* overall control: mostly access permissions */
{ .name = "CNTKCTL", .cp = 15, .crn = 14, .crm = 1, .opc1 = 0, .opc2 = 0,
@ -937,32 +943,36 @@ static const ARMCPRegInfo generic_timer_cp_reginfo[] = {
.type = ARM_CP_IO, .access = PL1_RW | PL0_R,
.fieldoffset = offsetof(CPUARMState, cp15.c14_timer[GTIMER_PHYS].ctl),
.resetvalue = 0,
.readfn = gt_ctl_read, .writefn = gt_ctl_write,
.raw_readfn = raw_read, .raw_writefn = raw_write,
.accessfn = gt_ptimer_access,
.writefn = gt_ctl_write, .raw_writefn = raw_write,
},
{ .name = "CNTV_CTL", .cp = 15, .crn = 14, .crm = 3, .opc1 = 0, .opc2 = 1,
.type = ARM_CP_IO, .access = PL1_RW | PL0_R,
.fieldoffset = offsetof(CPUARMState, cp15.c14_timer[GTIMER_VIRT].ctl),
.resetvalue = 0,
.readfn = gt_ctl_read, .writefn = gt_ctl_write,
.raw_readfn = raw_read, .raw_writefn = raw_write,
.accessfn = gt_vtimer_access,
.writefn = gt_ctl_write, .raw_writefn = raw_write,
},
/* TimerValue views: a 32 bit downcounting view of the underlying state */
{ .name = "CNTP_TVAL", .cp = 15, .crn = 14, .crm = 2, .opc1 = 0, .opc2 = 0,
.type = ARM_CP_NO_MIGRATE | ARM_CP_IO, .access = PL1_RW | PL0_R,
.accessfn = gt_ptimer_access,
.readfn = gt_tval_read, .writefn = gt_tval_write,
},
{ .name = "CNTV_TVAL", .cp = 15, .crn = 14, .crm = 3, .opc1 = 0, .opc2 = 0,
.type = ARM_CP_NO_MIGRATE | ARM_CP_IO, .access = PL1_RW | PL0_R,
.accessfn = gt_vtimer_access,
.readfn = gt_tval_read, .writefn = gt_tval_write,
},
/* The counter itself */
{ .name = "CNTPCT", .cp = 15, .crm = 14, .opc1 = 0,
.access = PL0_R, .type = ARM_CP_64BIT | ARM_CP_NO_MIGRATE | ARM_CP_IO,
.accessfn = gt_pct_access,
.readfn = gt_cnt_read, .resetfn = gt_cnt_reset,
},
{ .name = "CNTVCT", .cp = 15, .crm = 14, .opc1 = 1,
.access = PL0_R, .type = ARM_CP_64BIT | ARM_CP_NO_MIGRATE | ARM_CP_IO,
.accessfn = gt_vct_access,
.readfn = gt_cnt_read, .resetfn = gt_cnt_reset,
},
/* Comparison value, indicating when the timer goes off */
@ -971,16 +981,16 @@ static const ARMCPRegInfo generic_timer_cp_reginfo[] = {
.type = ARM_CP_64BIT | ARM_CP_IO,
.fieldoffset = offsetof(CPUARMState, cp15.c14_timer[GTIMER_PHYS].cval),
.resetvalue = 0,
.readfn = gt_cval_read, .writefn = gt_cval_write,
.raw_readfn = raw_read, .raw_writefn = raw_write,
.accessfn = gt_ptimer_access,
.writefn = gt_cval_write, .raw_writefn = raw_write,
},
{ .name = "CNTV_CVAL", .cp = 15, .crm = 14, .opc1 = 3,
.access = PL1_RW | PL0_R,
.type = ARM_CP_64BIT | ARM_CP_IO,
.fieldoffset = offsetof(CPUARMState, cp15.c14_timer[GTIMER_VIRT].cval),
.resetvalue = 0,
.readfn = gt_cval_read, .writefn = gt_cval_write,
.raw_readfn = raw_read, .raw_writefn = raw_write,
.accessfn = gt_vtimer_access,
.writefn = gt_cval_write, .raw_writefn = raw_write,
},
REGINFO_SENTINEL
};