Remove old code

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>

1 files changed, 0 insertions, 90 deletions

diff --git a/mm/tlb.cc b/mm/tlb.cc
deleted file mode 100644
index b7a8ba7..0000000
--- a/mm/tlb.cc
+++ /dev/null
@@ -1,90 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* Copyright (C) 2026 Richard Qin */
-
-/*
- * tlb.cc — TLB shootdown implementation
- *
- * Uses RISC-V SBI Remote Fence extension to perform cross-hart
- * TLB invalidation. SBI firmware handles the IPI delivery and
- * synchronization — the call blocks until all target harts have
- * completed their local sfence.vma.
- *
- * When a VmSpace is provided, we use its cpu_mask to target only
- * the CPUs that have this address space loaded in satp. This avoids
- * unnecessary IPI storms on unrelated cores.
- *
- * Reference: docs/specs/linux_abi_mm_plan.md §SMP §2.1
- */
-
-#include <lume/tlb.h>
-#include <lume/vmm.h>
-#include <lume/config.h>
-#include <arch/mmu.h>
-#include <arch/tlb.h>
-#include <arch/cpu.h>
-
-/*
- * If a shootdown range exceeds this many pages, do a full flush
- * instead of per-page invalidation.
- */
-static constexpr uint64 kShootdownPageThreshold = 32;
-
-/*
- * Build a cpu mask for all online CPUs (fallback when mm is null).
- */
-namespace {
-uint64 all_cpus_mask()
-{
-    uint64 mask = 0;
-    for (uint32 i = 0; i < kMaxCpus; i++) {
-        mask |= (1ULL << i);
-    }
-    return mask;
-}
-
-/*
- * Get the target cpu mask: use mm->cpu_mask when available,
- * fall back to all_cpus_mask for kernel address space (mm == nullptr).
- */
-uint64 target_cpu_mask(VmSpace* mm)
-{
-    if (mm) {
-        uint64 mask = mm->cpu_mask.load(__ATOMIC_RELAXED);
-        /* Always include our own CPU — we may still have stale TLB */
-        mask |= (1ULL << arch::cpu::id());
-        return mask;
-    }
-    return all_cpus_mask();
-}
-} // namespace
-
-void tlb_shootdown_range(VmSpace* mm, uint64 start, uint64 end)
-{
-    if (start >= end) {
-        return;
-    }
-
-    uint64 num_pages = (end - start) / kPageSize;
-    uint64 cpu_mask = target_cpu_mask(mm);
-
-    if (num_pages > kShootdownPageThreshold) {
-        /* Full flush on target CPUs via arch backend */
-        arch::tlb::flush_remote(cpu_mask, 0, ~0ULL);
-        return;
-    }
-
-    /* Range flush on target CPUs via arch backend */
-    arch::tlb::flush_remote(cpu_mask, start, end - start);
-}
-
-void tlb_shootdown_page(VmSpace* mm, uint64 va)
-{
-    uint64 cpu_mask = target_cpu_mask(mm);
-    arch::tlb::flush_remote(cpu_mask, va, kPageSize);
-}
-
-void tlb_shootdown_all()
-{
-    uint64 cpu_mask = all_cpus_mask();
-    arch::tlb::flush_remote(cpu_mask, 0, ~0ULL);
-}