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// SPDX-License-Identifier: GPL-2.0
// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//! Registers used by the memory management subsystems: the BAR0 PRAMIN window.
use kernel::io::register;
use crate::{
bounded_enum,
driver::NovaRegisters, //
};
// PRAMIN window
bounded_enum! {
/// Target memory type for the BAR0 window register.
///
/// Only VRAM is needed by the driver. Pre-Hopper window registers also define
/// system-memory targets that are unused here; Hopper+ uses a separate register
/// without a target field.
#[derive(Debug, Copy, Clone)]
pub(super) enum Bar0WindowTarget with TryFrom<Bounded<u32, 2>> {
/// Video memory (GPU framebuffer memory).
VidMem = 0,
}
}
register! {
base: NovaRegisters;
/// BAR0 window control for PRAMIN access.
pub(super) NV_PBUS_BAR0_WINDOW(u32) @ 0x00001700 {
/// Target memory aperture for the window.
25:24 target ?=> Bar0WindowTarget;
/// PRAMIN window base bits 39:16.
23:0 base;
}
}
pub(super) mod gh100 {
use kernel::io::register;
use crate::driver::NovaRegisters;
register! {
base: NovaRegisters;
/// Hopper register for PRAMIN window.
pub(crate) NV_XAL_EP_BAR0_WINDOW(u32) @ 0x0010fd40 {
/// PRAMIN window base bits 37:16.
21:0 base;
}
}
}
pub(super) mod gb100 {
use kernel::io::register;
use crate::driver::NovaRegisters;
register! {
base: NovaRegisters;
/// Blackwell GB10x/GB20x register for PRAMIN window.
pub(crate) NV_XAL_EP_BAR0_WINDOW(u32) @ 0x0010fd40 {
/// PRAMIN window base bits 38:16.
22:0 base;
}
}
}
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