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[boot][kernel] Replace frame allocator with bitmap-based one

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The previous frame allocator involved a lot of splitting and merging
linked lists and lost all information about frames while they were
allocated. The new allocator is based on an array of descriptor
structures and a bitmap. Each memory map region of allocatable memory
becomes one or more descriptors, each mapping up to 1GiB of physical
memory. The descriptors implement two levels of a bitmap tree, and have
a pointer into the large contiguous bitmap to track individual pages.
This commit is contained in:
Justin C. Miller
2021-01-22 00:16:01 -08:00
parent fd8552ca3a
commit aae18fd035
14 changed files with 419 additions and 212 deletions
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8
src/kernel/main.cpp
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@@ -37,8 +37,8 @@ extern void __kernel_assert(const char *, unsigned, const char *);
/// Bootstrap the memory managers.
void setup_pat();
void memory_initialize_pre_ctors(kernel::args::header *kargs);
void memory_initialize_post_ctors(kernel::args::header *kargs);
void memory_initialize_pre_ctors(kernel::args::header &kargs);
void memory_initialize_post_ctors(kernel::args::header &kargs);
using namespace kernel;
@@ -92,9 +92,9 @@ kernel_main(args::header *header)
gdt_init();
interrupts_init();
memory_initialize_pre_ctors(header);
memory_initialize_pre_ctors(*header);
run_constructors();
memory_initialize_post_ctors(header);
memory_initialize_post_ctors(*header);
for (size_t i = 0; i < header->num_modules; ++i) {
args::module &mod = header->modules[i];