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[Zion] Introduce the Kernel VMM to centralize allocs.

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This commit is contained in:
Drew Galbraith 2023-11-15 15:14:29 -08:00
parent 0b47e3b7fc
commit 20d6d2aaaf
5 changed files with 55 additions and 15 deletions
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18
zion/memory/slab_allocator.cpp
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@ -2,25 +2,13 @@
#include "debug/debug.h"
#include "memory/constants.h"
#include "memory/kernel_vmm.h"
#include "memory/paging_util.h"
namespace {
// TODO: Store these in a kernel VMM.
const uint64_t kSlabSize = 4 * KiB;
const uint64_t kSlabMask = ~(kSlabSize - 1);
uint64_t gNextSlab = kKernelSlabHeapStart;
uint64_t NextSlab() {
// FIXME: Synchronization.
uint64_t next_slab = gNextSlab;
if (next_slab >= kKernelBuddyHeapEnd) {
panic("Slab heap overrun");
}
gNextSlab += kSlabSize;
EnsureResident(next_slab, 1);
return next_slab;
}
} // namespace
@ -91,8 +79,8 @@ glcr::ErrorOr<void*> SlabAllocator::Allocate() {
return slab->Allocate();
}
dbgln("Allocating new kernel slab size {}", elem_size_);
void* next_slab = (uint64_t*)NextSlab();
void* next_slab =
reinterpret_cast<void*>(KernelVmm::AcquireSlabHeapRegion(kSlabSize));
slabs_.PushFront(glcr::AdoptPtr(new (next_slab) Slab(elem_size_)));
return slabs_.PeekFront()->Allocate();
}