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target/arm: Implement HCR.VI and VF 

The HCR_EL2 VI and VF bits are supposed to track whether there is
a pending virtual IRQ or virtual FIQ. For QEMU we store the
pending VIRQ/VFIQ status in cs->interrupt_request, so this means:
 * if the register is read we must get these bit values from
   cs->interrupt_request
 * if the register is written then we must write the bit
   values back into cs->interrupt_request

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181012144235.19646-7-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-10-24 07:50:17 +01:00
parent 636540e9c4
commit 8a0fc3a29f
1 changed files with 43 additions and 4 deletions
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47
target/arm/helper.c
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@ -3931,6 +3931,7 @@ static const ARMCPRegInfo el3_no_el2_v8_cp_reginfo[] = {
static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
{
ARMCPU *cpu = arm_env_get_cpu(env);
CPUState *cs = ENV_GET_CPU(env);
uint64_t valid_mask = HCR_MASK;
if (arm_feature(env, ARM_FEATURE_EL3)) {
@ -3949,6 +3950,28 @@ static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
/* Clear RES0 bits. */
value &= valid_mask;
/*
* VI and VF are kept in cs->interrupt_request. Modifying that
* requires that we have the iothread lock, which is done by
* marking the reginfo structs as ARM_CP_IO.
* Note that if a write to HCR pends a VIRQ or VFIQ it is never
* possible for it to be taken immediately, because VIRQ and
* VFIQ are masked unless running at EL0 or EL1, and HCR
* can only be written at EL2.
*/
g_assert(qemu_mutex_iothread_locked());
if (value & HCR_VI) {
cs->interrupt_request |= CPU_INTERRUPT_VIRQ;
} else {
cs->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
}
if (value & HCR_VF) {
cs->interrupt_request |= CPU_INTERRUPT_VFIQ;
} else {
cs->interrupt_request &= ~CPU_INTERRUPT_VFIQ;
}
value &= ~(HCR_VI | HCR_VF);
/* These bits change the MMU setup:
* HCR_VM enables stage 2 translation
* HCR_PTW forbids certain page-table setups
@ -3976,16 +3999,32 @@ static void hcr_writelow(CPUARMState *env, const ARMCPRegInfo *ri,
hcr_write(env, NULL, value);
}
static uint64_t hcr_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
/* The VI and VF bits live in cs->interrupt_request */
uint64_t ret = env->cp15.hcr_el2 & ~(HCR_VI | HCR_VF);
CPUState *cs = ENV_GET_CPU(env);
if (cs->interrupt_request & CPU_INTERRUPT_VIRQ) {
ret |= HCR_VI;
}
if (cs->interrupt_request & CPU_INTERRUPT_VFIQ) {
ret |= HCR_VF;
}
return ret;
}
static const ARMCPRegInfo el2_cp_reginfo[] = {
{ .name = "HCR_EL2", .state = ARM_CP_STATE_AA64,
.type = ARM_CP_IO,
.opc0 = 3, .opc1 = 4, .crn = 1, .crm = 1, .opc2 = 0,
.access = PL2_RW, .fieldoffset = offsetof(CPUARMState, cp15.hcr_el2),
.writefn = hcr_write },
.writefn = hcr_write, .readfn = hcr_read },
{ .name = "HCR", .state = ARM_CP_STATE_AA32,
.type = ARM_CP_ALIAS,
.type = ARM_CP_ALIAS | ARM_CP_IO,
.cp = 15, .opc1 = 4, .crn = 1, .crm = 1, .opc2 = 0,
.access = PL2_RW, .fieldoffset = offsetof(CPUARMState, cp15.hcr_el2),
.writefn = hcr_writelow },
.writefn = hcr_writelow, .readfn = hcr_read },
{ .name = "ELR_EL2", .state = ARM_CP_STATE_AA64,
.type = ARM_CP_ALIAS,
.opc0 = 3, .opc1 = 4, .crn = 4, .crm = 0, .opc2 = 1,
@ -4222,7 +4261,7 @@ static const ARMCPRegInfo el2_cp_reginfo[] = {
static const ARMCPRegInfo el2_v8_cp_reginfo[] = {
{ .name = "HCR2", .state = ARM_CP_STATE_AA32,
.type = ARM_CP_ALIAS,
.type = ARM_CP_ALIAS | ARM_CP_IO,
.cp = 15, .opc1 = 4, .crn = 1, .crm = 1, .opc2 = 4,
.access = PL2_RW,
.fieldoffset = offsetofhigh32(CPUARMState, cp15.hcr_el2),