78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
#include "object/address_space.h"
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#include "debug/debug.h"
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#include "memory/kernel_vmm.h"
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#include "memory/paging_util.h"
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#include "memory/physical_memory.h"
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#define K_VMAS_DEBUG 0
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glcr::RefPtr<AddressSpace> AddressSpace::ForRoot() {
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uint64_t cr3 = 0;
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asm volatile("mov %%cr3, %0;" : "=r"(cr3));
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return glcr::MakeRefCounted<AddressSpace>(cr3);
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}
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AddressSpace::AddressSpace() {
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cr3_ = phys_mem::AllocateAndZeroPage();
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InitializePml4(cr3_);
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}
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uint64_t AddressSpace::AllocateUserStack() {
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return user_stacks_.NewUserStack();
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}
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uint64_t AddressSpace::GetNextMemMapAddr(uint64_t size) {
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if (size == 0) {
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panic("Zero size memmap");
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}
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size = ((size - 1) & ~0xFFF) + 0x1000;
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uint64_t addr = next_memmap_addr_;
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next_memmap_addr_ += size;
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if (next_memmap_addr_ >= 0x30'00000000) {
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panic("OOM: Memmap");
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}
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return addr;
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}
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glcr::ErrorCode AddressSpace::MapInMemoryObject(
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uint64_t vaddr, const glcr::RefPtr<MemoryObject>& mem_obj) {
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return mapping_tree_.AddInMemoryObject(vaddr, mem_obj);
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}
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glcr::ErrorOr<uint64_t> AddressSpace::MapInMemoryObject(
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const glcr::RefPtr<MemoryObject>& mem_obj) {
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uint64_t vaddr = GetNextMemMapAddr(mem_obj->size());
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RET_ERR(mapping_tree_.AddInMemoryObject(vaddr, mem_obj));
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return vaddr;
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}
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uint64_t AddressSpace::AllocateKernelStack() {
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return KernelVmm::AcquireKernelStack();
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}
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bool AddressSpace::HandlePageFault(uint64_t vaddr) {
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#if K_VMAS_DEBUG
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dbgln("[VMAS] Page Fault!");
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#endif
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if (vaddr < kPageSize) {
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// Invalid page access.
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return false;
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}
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if (user_stacks_.IsValidStack(vaddr)) {
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MapPage(cr3_, vaddr, phys_mem::AllocatePage());
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return true;
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}
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auto offset_or = mapping_tree_.GetPhysicalPageAtVaddr(vaddr);
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if (!offset_or.ok()) {
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return false;
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}
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#if K_VMAS_DEBUG
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dbgln("[VMAS] Mapping P({x}) at V({x})", physical_addr, vaddr);
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#endif
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MapPage(cr3_, vaddr, offset_or.value());
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return true;
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}
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