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nac3artiq: add stubs for now-pinning on rv32g (#97)

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This commit is contained in:
Sebastien Bourdeauducq 2021-11-13 12:10:55 +08:00
parent d6b92adf70
commit 9ae08d6e3d
2 changed files with 21 additions and 1 deletions
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2
nac3artiq/src/lib.rs
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@ -212,7 +212,7 @@ impl Nac3 {
};
let time_fns: &(dyn TimeFns + Sync) = match isa {
Isa::Host => &timeline::EXTERN_TIME_FNS,
Isa::RiscV32G => &timeline::NOW_PINNING_TIME_FNS,
Isa::RiscV32G => &timeline::NOW_PINNING_TIME_FNS_64,
Isa::RiscV32IMA => &timeline::NOW_PINNING_TIME_FNS,
Isa::CortexA9 => &timeline::EXTERN_TIME_FNS,
};

20
nac3artiq/src/timeline.rs
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@ -7,6 +7,26 @@ pub trait TimeFns {
fn emit_delay_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, dt: BasicValueEnum<'ctx>);
}
pub struct NowPinningTimeFns64 {}
// For FPGA design reasons, on VexRiscv with 64-bit data bus, the "now" CSR is split into two 32-bit
// values that are each padded to 64-bits.
impl TimeFns for NowPinningTimeFns64 {
fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx> {
unimplemented!();
}
fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>) {
unimplemented!();
}
fn emit_delay_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, dt: BasicValueEnum<'ctx>) {
unimplemented!();
}
}
pub static NOW_PINNING_TIME_FNS_64: NowPinningTimeFns64 = NowPinningTimeFns64 {};
pub struct NowPinningTimeFns {}
impl TimeFns for NowPinningTimeFns {