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[kernel] Change heap alloc for better alignment

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Created a new util/node_map.h that implements a map that grows in-place.
Now this is used for tracking blocks' size orders, instead of a header
at the start of the memory block. This allows the whole buddy block to
be allocated, allowing for page-aligned (or greater) blocks to be
requested from the heap.
This commit is contained in:
Justin C. Miller
2022-10-02 17:27:21 -07:00
parent 11b61ab345
commit e90647d498
9 changed files with 518 additions and 144 deletions
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11
src/kernel/memory_bootstrap.cpp
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@@ -37,6 +37,9 @@ frame_allocator &g_frame_allocator = __g_frame_allocator_storage.value;
static util::no_construct<obj::vm_area_untracked> __g_kernel_heap_area_storage;
obj::vm_area_untracked &g_kernel_heap_area = __g_kernel_heap_area_storage.value;
static util::no_construct<obj::vm_area_untracked> __g_kernel_heapmap_area_storage;
obj::vm_area_untracked &g_kernel_heapmap_area = __g_kernel_heapmap_area_storage.value;
static util::no_construct<obj::vm_area_guarded> __g_kernel_stacks_storage;
obj::vm_area_guarded &g_kernel_stacks = __g_kernel_stacks_storage.value;
@@ -73,7 +76,6 @@ memory_initialize_pre_ctors(bootproto::args &kargs)
page_table *kpml4 = static_cast<page_table*>(kargs.pml4);
new (&g_kernel_heap) heap_allocator {mem::heap_offset, mem::heap_size};
frame_block *blocks = reinterpret_cast<frame_block*>(mem::bitmap_offset);
new (&g_frame_allocator) frame_allocator {blocks, kargs.frame_blocks.count};
@@ -87,13 +89,20 @@ memory_initialize_pre_ctors(bootproto::args &kargs)
reg = reg->next;
}
obj::process *kp = obj::process::create_kernel_process(kpml4);
vm_space &vm = kp->space();
obj::vm_area *heap = new (&g_kernel_heap_area)
obj::vm_area_untracked(mem::heap_size, vm_flags::write);
obj::vm_area *heap_map = new (&g_kernel_heapmap_area)
obj::vm_area_untracked(mem::heapmap_size, vm_flags::write);
vm.add(mem::heap_offset, heap);
vm.add(mem::heapmap_offset, heap_map);
new (&g_kernel_heap) heap_allocator {mem::heap_offset, mem::heap_size, mem::heapmap_offset};
obj::vm_area *stacks = new (&g_kernel_stacks) obj::vm_area_guarded {
mem::stacks_offset,