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hw/intc/riscv_aplic: Fix in_clrip[x] read emulation

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The reads to in_clrip[x] registers return rectified input values of the
interrupt sources.

A rectified input value of an interrupt source is defined by the section
"4.5.2 Source configurations (sourcecfg[1]–sourcecfg[1023])" of the RISC-V
AIA specification as:
"rectified input value = (incoming wire value) XOR (source is inverted)"

Update the riscv_aplic_read_input_word() implementation to match the above.

Fixes: e8f79343cf ("hw/intc: Add RISC-V AIA APLIC device emulation")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240306095722.463296-3-apatel@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel 2024-03-06 15:27:22 +05:30 committed by Alistair Francis
parent bf31cf06eb
commit 0678e9f29c
1 changed files with 15 additions and 2 deletions
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17
hw/intc/riscv_aplic.c
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@ -162,7 +162,7 @@ static bool is_kvm_aia(bool msimode)
static uint32_t riscv_aplic_read_input_word(RISCVAPLICState *aplic,
uint32_t word)
{
uint32_t i, irq, ret = 0;
uint32_t i, irq, sourcecfg, sm, raw_input, irq_inverted, ret = 0;
for (i = 0; i < 32; i++) {
irq = word * 32 + i;
@ -170,7 +170,20 @@ static uint32_t riscv_aplic_read_input_word(RISCVAPLICState *aplic,
continue;
}
ret |= ((aplic->state[irq] & APLIC_ISTATE_INPUT) ? 1 : 0) << i;
sourcecfg = aplic->sourcecfg[irq];
if (sourcecfg & APLIC_SOURCECFG_D) {
continue;
}
sm = sourcecfg & APLIC_SOURCECFG_SM_MASK;
if (sm == APLIC_SOURCECFG_SM_INACTIVE) {
continue;
}
raw_input = (aplic->state[irq] & APLIC_ISTATE_INPUT) ? 1 : 0;
irq_inverted = (sm == APLIC_SOURCECFG_SM_LEVEL_LOW ||
sm == APLIC_SOURCECFG_SM_EDGE_FALL) ? 1 : 0;
ret |= (raw_input ^ irq_inverted) << i;
}
return ret;