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[kernel] Implement VMA page tracking

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The previous method of VMA page tracking relied on the VMA always being
mapped at least into one space and just kept track of pages in the
spaces' page tables. This had a number of drawbacks, and the mapper
system was too complex without much benefit.

Now make VMAs themselves keep track of spaces that they're a part of,
and make them responsible for knowing what page goes where. This
simplifies most types of VMA greatly. The new vm_area_open (nee
vm_area_shared, but there is now no reason for most VMAs to be
explicitly shareable) adds a 64-ary radix tree for tracking allocated
pages.

The page_tree cannot yet handle taking pages away, but this isn't
something jsix can do yet anyway.
This commit is contained in:
Justin C. Miller
2021-01-31 22:18:44 -08:00
parent c364e30240
commit 634a1c5f6a
14 changed files with 412 additions and 411 deletions
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6
src/kernel/objects/thread.cpp
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@@ -9,7 +9,7 @@
extern "C" void kernel_to_user_trampoline();
static constexpr j6_signal_t thread_default_signals = 0;
extern vm_area_buffers g_kernel_stacks;
extern vm_area_guarded g_kernel_stacks;
thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
kobject(kobject::type::thread, thread_default_signals),
@@ -32,7 +32,7 @@ thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
thread::~thread()
{
g_kernel_stacks.return_buffer(m_tcb.kernel_stack);
g_kernel_stacks.return_section(m_tcb.kernel_stack);
}
thread *
@@ -204,7 +204,7 @@ thread::setup_kernel_stack()
constexpr unsigned null_frame_entries = 2;
constexpr size_t null_frame_size = null_frame_entries * sizeof(uint64_t);
uintptr_t stack_addr = g_kernel_stacks.get_buffer();
uintptr_t stack_addr = g_kernel_stacks.get_section();
uintptr_t stack_end = stack_addr + stack_bytes;
uint64_t *null_frame = reinterpret_cast<uint64_t*>(stack_end - null_frame_size);