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[kernel] Move kernel stacks out of the heap

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We were previously allocating kernel stacks as large objects on the
heap. Now keep track of areas of the kernel stack area that are in use,
and allocate them from there. Also required actually implementing
vm_space::commit(). This still needs more work.
This commit is contained in:
Justin C. Miller
2020-08-02 18:15:28 -07:00
parent b98334db28
commit 579eaaf4a0
9 changed files with 123 additions and 33 deletions
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13
src/kernel/memory_bootstrap.cpp
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@@ -24,7 +24,8 @@ using memory::table_entries;
using namespace kernel;
kutil::vm_space g_kernel_space;
kutil::vm_space g_kernel_space {kernel_offset, (page_offset-kernel_offset)};
// These objects are initialized _before_ global constructors are called,
// so we don't want them to have global constructors at all, lest they
@@ -61,7 +62,8 @@ void walk_page_table(
for (unsigned i = 0; i < table_entries; ++i) {
page_table *next = table->get(i);
if (!next) {
kspace.commit(current_start, current_bytes);
if (current_bytes)
kspace.commit(current_start, current_bytes);
current_start = 0;
current_bytes = 0;
continue;
@@ -109,10 +111,6 @@ memory_initialize_pre_ctors(args::header *kargs)
void
memory_initialize_post_ctors(args::header *kargs)
{
new (&g_kernel_space) kutil::vm_space {
kernel_offset,
(page_offset-kernel_offset)};
uintptr_t current_start = 0;
size_t current_bytes = 0;
@@ -122,7 +120,8 @@ memory_initialize_post_ctors(args::header *kargs)
page_table *pdp = kpml4->get(i);
if (!pdp) {
g_kernel_space.commit(current_start, current_bytes);
if (current_bytes)
g_kernel_space.commit(current_start, current_bytes);
current_start = 0;
current_bytes = 0;
continue;