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target/ppc: create an interrupt masking method for POWER9/POWER10 

The new method is identical to ppc_next_unmasked_interrupt_generic,
processor-specific code will be added/removed in the following patches.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Message-Id: <20221011204829.1641124-6-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-10-11 17:48:05 -03:00 committed by Daniel Henrique Barboza
parent ba2898f79f
commit 2dfecf0195
1 changed files with 113 additions and 0 deletions
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113
target/ppc/excp_helper.c
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@ -1684,6 +1684,114 @@ void ppc_cpu_do_interrupt(CPUState *cs)
powerpc_excp(cpu, cs->exception_index);
}
#if defined(TARGET_PPC64)
static int p9_next_unmasked_interrupt(CPUPPCState *env)
{
bool async_deliver;
/* External reset */
if (env->pending_interrupts & PPC_INTERRUPT_RESET) {
return PPC_INTERRUPT_RESET;
}
/* Machine check exception */
if (env->pending_interrupts & PPC_INTERRUPT_MCK) {
return PPC_INTERRUPT_MCK;
}
/*
* For interrupts that gate on MSR:EE, we need to do something a
* bit more subtle, as we need to let them through even when EE is
* clear when coming out of some power management states (in order
* for them to become a 0x100).
*/
async_deliver = FIELD_EX64(env->msr, MSR, EE) || env->resume_as_sreset;
/* Hypervisor decrementer exception */
if (env->pending_interrupts & PPC_INTERRUPT_HDECR) {
/* LPCR will be clear when not supported so this will work */
bool hdice = !!(env->spr[SPR_LPCR] & LPCR_HDICE);
if ((async_deliver || !FIELD_EX64_HV(env->msr)) && hdice) {
/* HDEC clears on delivery */
return PPC_INTERRUPT_HDECR;
}
}
/* Hypervisor virtualization interrupt */
if (env->pending_interrupts & PPC_INTERRUPT_HVIRT) {
/* LPCR will be clear when not supported so this will work */
bool hvice = !!(env->spr[SPR_LPCR] & LPCR_HVICE);
if ((async_deliver || !FIELD_EX64_HV(env->msr)) && hvice) {
return PPC_INTERRUPT_HVIRT;
}
}
/* External interrupt can ignore MSR:EE under some circumstances */
if (env->pending_interrupts & PPC_INTERRUPT_EXT) {
bool lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0);
bool heic = !!(env->spr[SPR_LPCR] & LPCR_HEIC);
/* HEIC blocks delivery to the hypervisor */
if ((async_deliver && !(heic && FIELD_EX64_HV(env->msr) &&
!FIELD_EX64(env->msr, MSR, PR))) ||
(env->has_hv_mode && !FIELD_EX64_HV(env->msr) && !lpes0)) {
return PPC_INTERRUPT_EXT;
}
}
if (FIELD_EX64(env->msr, MSR, CE)) {
/* External critical interrupt */
if (env->pending_interrupts & PPC_INTERRUPT_CEXT) {
return PPC_INTERRUPT_CEXT;
}
}
if (async_deliver != 0) {
/* Watchdog timer on embedded PowerPC */
if (env->pending_interrupts & PPC_INTERRUPT_WDT) {
return PPC_INTERRUPT_WDT;
}
if (env->pending_interrupts & PPC_INTERRUPT_CDOORBELL) {
return PPC_INTERRUPT_CDOORBELL;
}
/* Fixed interval timer on embedded PowerPC */
if (env->pending_interrupts & PPC_INTERRUPT_FIT) {
return PPC_INTERRUPT_FIT;
}
/* Programmable interval timer on embedded PowerPC */
if (env->pending_interrupts & PPC_INTERRUPT_PIT) {
return PPC_INTERRUPT_PIT;
}
/* Decrementer exception */
if (env->pending_interrupts & PPC_INTERRUPT_DECR) {
return PPC_INTERRUPT_DECR;
}
if (env->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
return PPC_INTERRUPT_DOORBELL;
}
if (env->pending_interrupts & PPC_INTERRUPT_HDOORBELL) {
return PPC_INTERRUPT_HDOORBELL;
}
if (env->pending_interrupts & PPC_INTERRUPT_PERFM) {
return PPC_INTERRUPT_PERFM;
}
/* Thermal interrupt */
if (env->pending_interrupts & PPC_INTERRUPT_THERM) {
return PPC_INTERRUPT_THERM;
}
/* EBB exception */
if (env->pending_interrupts & PPC_INTERRUPT_EBB) {
/*
* EBB exception must be taken in problem state and
* with BESCR_GE set.
*/
if (FIELD_EX64(env->msr, MSR, PR) &&
(env->spr[SPR_BESCR] & BESCR_GE)) {
return PPC_INTERRUPT_EBB;
}
}
}
return 0;
}
#endif
static int ppc_next_unmasked_interrupt_generic(CPUPPCState *env)
{
bool async_deliver;
@ -1799,6 +1907,11 @@ static int ppc_next_unmasked_interrupt_generic(CPUPPCState *env)
static int ppc_next_unmasked_interrupt(CPUPPCState *env)
{
switch (env->excp_model) {
#if defined(TARGET_PPC64)
case POWERPC_EXCP_POWER9:
case POWERPC_EXCP_POWER10:
return p9_next_unmasked_interrupt(env);
#endif
default:
return ppc_next_unmasked_interrupt_generic(env);
}