gpu: nova-core: mm: Add PRAMIN window registers

PRAMIN apertures are a crucial mechanism for direct CPU read/write to
VRAM. Add the BAR0 window registers that position the PRAMIN aperture
on all supported GPU architectures: Turing, Ampere, Ada (via
`NV_PBUS_BAR0_WINDOW`), Hopper (via `gh100::NV_XAL_EP_BAR0_WINDOW`),
and Blackwell (via `gb100::NV_XAL_EP_BAR0_WINDOW`).

Hopper/Blackwell window-base registers are based on Eliot Courtney's
offlist reference patch.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
[ecourtney: split the registers out of the PRAMIN patch into mm/regs.rs]
[ecourtney: drop the register read path]
[ecourtney: reword the message for the split, narrow visibility to mm]
[ecourtney: plain base fields, as the bitfield cast+shift patch is dropped]
[ecourtney: rename the target to VidMem, fix derives, redo the target docs]
[ecourtney: annotate the register base types]
Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260827-pramin-split-v3-3-24b24d7afc52@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

0 files changed, 0 insertions, 0 deletions