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target/riscv: Add HS-mode virtual interrupt and IRQ filtering support.

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This change adds support for inserting virtual interrupts from HS-mode
into VS-mode using hvien and hvip csrs. This also allows for IRQ filtering
from HS-mode.

Also, the spec doesn't mandate the interrupt to be actually supported
in hardware. Which allows HS-mode to assert virtual interrupts to VS-mode
that have no connection to any real interrupt events.

This is defined as part of the AIA specification [0], "6.3.2 Virtual
interrupts for VS level".

[0]: https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interrupts-1.0.pdf

Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20231016111736.28721-7-rkanwal@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Rajnesh Kanwal 2023-10-16 12:17:36 +01:00 • committed by Alistair Francis
parent 1697837ed9
commit 40336d5b1d
5 changed files with 235 additions and 31 deletions
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3
target/riscv/cpu.c
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@ -814,7 +814,8 @@ static bool riscv_cpu_has_work(CPUState *cs)
* mode and delegation registers, but respect individual enables
*/
return riscv_cpu_all_pending(env) != 0 ||
riscv_cpu_sirq_pending(env) != RISCV_EXCP_NONE;
riscv_cpu_sirq_pending(env) != RISCV_EXCP_NONE ||
riscv_cpu_vsirq_pending(env) != RISCV_EXCP_NONE;
#else
return true;
#endif