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Kernel: Rewrite paging and AP initialization

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Initial step of paging now just prepares fast page for heap, actual page
table initialization happens after heap is initialized which allows
x86_64 to never depend on kmalloc for pages.

Processor's stacks are now also spawned with PMM/VMM allocated stacks
instead of kmalloc identity mapped.
This commit is contained in:
Bananymous
2026-05-02 15:45:08 +03:00
parent 1602b195c5
commit 03fccdffe1
11 changed files with 370 additions and 487 deletions
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27
kernel/kernel/APIC.cpp
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@@ -293,9 +293,25 @@ namespace Kernel
dprintln("Trying to enable processor (lapic id {})", processor.apic_id);
auto& proc = Kernel::Processor::create(ProcessorID(processor.apic_id));
proc.allocate_stack();
struct ap_init_info_t
{
uintptr_t stack_paddr;
uintptr_t stack_vaddr;
uintptr_t prepare_paging;
uintptr_t page_table;
uintptr_t ready;
};
PageTable::with_fast_page(ap_init_paddr, [&] {
PageTable::fast_page_as_sized<uint32_t>(2) = kmalloc_paddr_of(proc.stack_top()).value();
PageTable::fast_page_as_sized<uint8_t>(13) = 0;
PageTable::fast_page_as<ap_init_info_t>(8) = {
.stack_paddr = static_cast<uintptr_t>(proc.stack_top_paddr()),
.stack_vaddr = proc.stack_top_vaddr(),
.prepare_paging = reinterpret_cast<uintptr_t>(&PageTable::enable_cpu_features),
.page_table = static_cast<uintptr_t>(PageTable::kernel().paddr()),
.ready = 0,
};
});
write_to_local_apic(LAPIC_ERROR_REG, 0x00);
@@ -334,12 +350,9 @@ namespace Kernel
// give processor upto 100 * 100 us + 200 us to boot
PageTable::with_fast_page(ap_init_paddr, [&] {
for (int i = 0; i < 100; i++)
{
if (__atomic_load_n(&PageTable::fast_page_as_sized<uint8_t>(13), __ATOMIC_SEQ_CST))
for (int i = 0; i < 100; i++, udelay(100))
if (__atomic_load_n(&PageTable::fast_page_as<ap_init_info_t>(8).ready, __ATOMIC_SEQ_CST))
break;
udelay(100);
}
});
initialized_aps++;