EIC is required for pic32 microcontroller.
Signed-off-by: Serge Vakulenko <serge.vakule...@gmail.com>
---
hw/mips/cputimer.c | 17 +++++++++++++++--
hw/mips/mips_int.c | 8 +++++++-
target-mips/cpu.h | 8 +++++++-
target-mips/helper.c | 18 ++++++++++++------
4 files changed, 41 insertions(+), 10 deletions(-)
diff --git a/hw/mips/cputimer.c b/hw/mips/cputimer.c
index 58707ed..dab532d 100644
--- a/hw/mips/cputimer.c
+++ b/hw/mips/cputimer.c
@@ -63,7 +63,13 @@ static void cpu_mips_timer_expire(CPUMIPSState *env)
if (env->insn_flags & ISA_MIPS32R2) {
env->CP0_Cause |= 1 << CP0Ca_TI;
}
- qemu_irq_raise(env->irq[(env->CP0_IntCtl >> CP0IntCtl_IPTI) & 0x7]);
+ if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
+ /* External interrupt controller mode. */
+ qemu_irq_raise(env->eic_timer_irq);
+ } else {
+ /* Legacy or vectored interrupt mode. */
+ qemu_irq_raise(env->irq[(env->CP0_IntCtl >> CP0IntCtl_IPTI) & 0x7]);
+ }
}
uint32_t cpu_mips_get_count (CPUMIPSState *env)
@@ -111,7 +117,14 @@ void cpu_mips_store_compare (CPUMIPSState *env, uint32_t
value)
cpu_mips_timer_update(env);
if (env->insn_flags & ISA_MIPS32R2)
env->CP0_Cause &= ~(1 << CP0Ca_TI);
- qemu_irq_lower(env->irq[(env->CP0_IntCtl >> CP0IntCtl_IPTI) & 0x7]);
+
+ if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
+ /* External interrupt controller mode. */
+ qemu_irq_lower(env->eic_timer_irq);
+ } else {
+ /* Legacy or vectored interrupt mode. */
+ qemu_irq_lower(env->irq[(env->CP0_IntCtl >> CP0IntCtl_IPTI) & 0x7]);
+ }
}
void cpu_mips_start_count(CPUMIPSState *env)
diff --git a/hw/mips/mips_int.c b/hw/mips/mips_int.c
index d740046..eb92439 100644
--- a/hw/mips/mips_int.c
+++ b/hw/mips/mips_int.c
@@ -74,5 +74,11 @@ void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
return;
}
- qemu_set_irq(env->irq[irq], level);
+ if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
+ /* External interrupt controller mode. */
+ qemu_set_irq(env->eic_soft_irq[irq], level);
+ } else {
+ /* Legacy or vectored interrupt mode. */
+ qemu_set_irq(env->irq[irq], level);
+ }
}
diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index c476166..9513f02 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -596,6 +596,10 @@ struct CPUMIPSState {
void *irq[8];
QEMUTimer *timer; /* Internal timer */
unsigned count_freq; /* rate of Count register */
+
+ /* Fields for external interrupt controller. */
+ void *eic_timer_irq;
+ void *eic_soft_irq[2];
};
#include "cpu-qom.h"
@@ -664,7 +668,9 @@ static inline int
cpu_mips_hw_interrupts_pending(CPUMIPSState *env)
if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
/* A MIPS configured with a vectorizing external interrupt controller
will feed a vector into the Cause pending lines. The core treats
- the status lines as a vector level, not as indiviual masks. */
+ the status lines as a vector level, not as individual masks. */
+ pending >>= CP0Ca_IP + 2;
+ status >>= CP0Ca_IP + 2;
r = pending > status;
} else {
/* A MIPS configured with compatibility or VInt (Vectored Interrupts)
diff --git a/target-mips/helper.c b/target-mips/helper.c
index 8e3204a..6fe5212 100644
--- a/target-mips/helper.c
+++ b/target-mips/helper.c
@@ -574,23 +574,29 @@ void mips_cpu_do_interrupt(CPUState *cs)
unsigned int vector;
unsigned int pending = (env->CP0_Cause & CP0Ca_IP_mask) >> 8;
- pending &= env->CP0_Status >> 8;
/* Compute the Vector Spacing. */
spacing = (env->CP0_IntCtl >> CP0IntCtl_VS) & ((1 << 6) - 1);
spacing <<= 5;
- if (env->CP0_Config3 & (1 << CP0C3_VInt)) {
+ if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
+ /* For VEIC mode, the external interrupt controller feeds the
+ * vector through the CP0Cause IP lines. */
+ vector = pending;
+
+ /* Architecturally, this is chip-specific behavior.
+ * Some processors, like PIC32, have a separate
+ * bit INTCON.MVEC to explicitly enable vectored mode,
+ * disabled by default. */
+ spacing = 0;
+ } else {
/* For VInt mode, the MIPS computes the vector internally. */
+ pending &= env->CP0_Status >> 8;
for (vector = 7; vector > 0; vector--) {
if (pending & (1 << vector)) {
/* Found it. */
break;
}
}
- } else {
- /* For VEIC mode, the external interrupt controller feeds the
- vector through the CP0Cause IP lines. */
- vector = pending;
}
offset = 0x200 + vector * spacing;
}
--
2.2.2
