forked from Bananymous/banan-os
691 lines
18 KiB
C++
691 lines
18 KiB
C++
#include <kernel/BootInfo.h>
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#include <kernel/CPUID.h>
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#include <kernel/Lock/SpinLock.h>
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#include <kernel/Memory/kmalloc.h>
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#include <kernel/Memory/PageTable.h>
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extern uint8_t g_kernel_start[];
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extern uint8_t g_kernel_end[];
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extern uint8_t g_kernel_execute_start[];
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extern uint8_t g_kernel_execute_end[];
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extern uint8_t g_kernel_writable_start[];
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extern uint8_t g_kernel_writable_end[];
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extern uint8_t g_userspace_start[];
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extern uint8_t g_userspace_end[];
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namespace Kernel
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{
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SpinLock PageTable::s_fast_page_lock;
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static PageTable* s_kernel = nullptr;
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static bool s_has_nxe = false;
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static bool s_has_pge = false;
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static bool s_has_pat = false;
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static paddr_t s_global_pdpte = 0;
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static inline PageTable::flags_t parse_flags(uint64_t entry)
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{
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using Flags = PageTable::Flags;
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PageTable::flags_t result = 0;
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if (s_has_nxe && !(entry & (1ull << 63)))
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result |= Flags::Execute;
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if (entry & Flags::Reserved)
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result |= Flags::Reserved;
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if (entry & Flags::UserSupervisor)
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result |= Flags::UserSupervisor;
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if (entry & Flags::ReadWrite)
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result |= Flags::ReadWrite;
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if (entry & Flags::Present)
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result |= Flags::Present;
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return result;
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}
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void PageTable::initialize_pre_heap()
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{
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if (CPUID::has_nxe())
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s_has_nxe = true;
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if (CPUID::has_pge())
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s_has_pge = true;
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if (CPUID::has_pat())
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s_has_pat = true;
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ASSERT(s_kernel == nullptr);
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s_kernel = new PageTable();
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ASSERT(s_kernel);
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s_kernel->initialize_kernel();
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s_kernel->initial_load();
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}
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void PageTable::initialize_post_heap()
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{
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// NOTE: this is no-op as our 32 bit target does not use hhdm
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}
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void PageTable::initial_load()
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{
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if (s_has_nxe)
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{
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asm volatile(
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"movl $0xC0000080, %%ecx;"
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"rdmsr;"
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"orl $0x800, %%eax;"
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"wrmsr"
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::: "eax", "ecx", "edx", "memory"
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);
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}
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if (s_has_pge)
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{
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asm volatile(
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"movl %%cr4, %%eax;"
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"orl $0x80, %%eax;"
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"movl %%eax, %%cr4;"
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::: "eax"
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);
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}
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if (s_has_pat)
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{
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asm volatile(
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"movl $0x277, %%ecx;"
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"rdmsr;"
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"movw $0x0401, %%dx;"
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"wrmsr;"
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::: "eax", "ecx", "edx", "memory"
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);
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}
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// enable write protect
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asm volatile(
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"movl %%cr0, %%eax;"
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"orl $0x10000, %%eax;"
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"movl %%eax, %%cr0;"
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::: "rax"
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);
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load();
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}
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PageTable& PageTable::kernel()
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{
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ASSERT(s_kernel);
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return *s_kernel;
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}
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bool PageTable::is_valid_pointer(uintptr_t)
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{
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return true;
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}
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static uint64_t* allocate_zeroed_page_aligned_page()
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{
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void* page = kmalloc(PAGE_SIZE, PAGE_SIZE, true);
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ASSERT(page);
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memset(page, 0, PAGE_SIZE);
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return (uint64_t*)page;
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}
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template<typename T>
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static paddr_t V2P(const T vaddr)
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{
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return (vaddr_t)vaddr - KERNEL_OFFSET + g_boot_info.kernel_paddr;
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}
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template<typename T>
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static vaddr_t P2V(const T paddr)
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{
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return (paddr_t)paddr - g_boot_info.kernel_paddr + KERNEL_OFFSET;
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}
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void PageTable::initialize_kernel()
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{
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ASSERT(s_global_pdpte == 0);
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s_global_pdpte = V2P(allocate_zeroed_page_aligned_page());
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map_kernel_memory();
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prepare_fast_page();
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// Map (phys_kernel_start -> phys_kernel_end) to (virt_kernel_start -> virt_kernel_end)
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ASSERT((vaddr_t)g_kernel_start % PAGE_SIZE == 0);
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map_range_at(
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V2P(g_kernel_start),
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(vaddr_t)g_kernel_start,
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g_kernel_end - g_kernel_start,
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Flags::Present
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);
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// Map executable kernel memory as executable
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map_range_at(
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V2P(g_kernel_execute_start),
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(vaddr_t)g_kernel_execute_start,
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g_kernel_execute_end - g_kernel_execute_start,
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Flags::Execute | Flags::Present
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);
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// Map writable kernel memory as writable
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map_range_at(
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V2P(g_kernel_writable_start),
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(vaddr_t)g_kernel_writable_start,
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g_kernel_writable_end - g_kernel_writable_start,
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Flags::ReadWrite | Flags::Present
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);
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// Map userspace memory
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map_range_at(
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V2P(g_userspace_start),
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(vaddr_t)g_userspace_start,
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g_userspace_end - g_userspace_start,
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Flags::Execute | Flags::UserSupervisor | Flags::Present
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);
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}
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void PageTable::prepare_fast_page()
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{
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constexpr uint64_t pdpte = (fast_page() >> 30) & 0x1FF;
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constexpr uint64_t pde = (fast_page() >> 21) & 0x1FF;
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
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ASSERT(pdpt[pdpte] & Flags::Present);
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte]) & PAGE_ADDR_MASK);
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ASSERT(!(pd[pde] & Flags::Present));
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pd[pde] = V2P(allocate_zeroed_page_aligned_page()) | Flags::ReadWrite | Flags::Present;
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}
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void PageTable::map_fast_page(paddr_t paddr)
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{
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ASSERT(s_kernel);
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ASSERT(paddr);
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ASSERT(paddr % PAGE_SIZE == 0);
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ASSERT(s_fast_page_lock.current_processor_has_lock());
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constexpr uint64_t pdpte = (fast_page() >> 30) & 0x1FF;
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constexpr uint64_t pde = (fast_page() >> 21) & 0x1FF;
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constexpr uint64_t pte = (fast_page() >> 12) & 0x1FF;
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(s_kernel->m_highest_paging_struct));
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
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uint64_t* pt = reinterpret_cast<uint64_t*>(P2V(pd[pde] & PAGE_ADDR_MASK));
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ASSERT(!(pt[pte] & Flags::Present));
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pt[pte] = paddr | Flags::ReadWrite | Flags::Present;
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invalidate(fast_page(), false);
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}
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void PageTable::unmap_fast_page()
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{
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ASSERT(s_kernel);
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ASSERT(s_fast_page_lock.current_processor_has_lock());
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constexpr uint64_t pdpte = (fast_page() >> 30) & 0x1FF;
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constexpr uint64_t pde = (fast_page() >> 21) & 0x1FF;
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constexpr uint64_t pte = (fast_page() >> 12) & 0x1FF;
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(s_kernel->m_highest_paging_struct));
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
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uint64_t* pt = reinterpret_cast<uint64_t*>(P2V(pd[pde] & PAGE_ADDR_MASK));
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ASSERT(pt[pte] & Flags::Present);
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pt[pte] = 0;
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invalidate(fast_page(), false);
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}
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BAN::ErrorOr<PageTable*> PageTable::create_userspace()
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{
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SpinLockGuard _(s_kernel->m_lock);
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PageTable* page_table = new PageTable;
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if (page_table == nullptr)
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return BAN::Error::from_errno(ENOMEM);
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page_table->map_kernel_memory();
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return page_table;
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}
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void PageTable::map_kernel_memory()
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{
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ASSERT(s_kernel);
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ASSERT(s_global_pdpte);
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ASSERT(m_highest_paging_struct == 0);
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m_highest_paging_struct = V2P(kmalloc(32, 32, true));
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ASSERT(m_highest_paging_struct);
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
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pdpt[0] = 0;
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pdpt[1] = 0;
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pdpt[2] = 0;
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pdpt[3] = s_global_pdpte | Flags::Present;
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static_assert(KERNEL_OFFSET == 0xC0000000);
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}
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PageTable::~PageTable()
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{
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if (m_highest_paging_struct == 0)
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return;
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
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for (uint32_t pdpte = 0; pdpte < 3; pdpte++)
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{
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if (!(pdpt[pdpte] & Flags::Present))
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continue;
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
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for (uint32_t pde = 0; pde < 512; pde++)
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{
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if (!(pd[pde] & Flags::Present))
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continue;
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kfree(reinterpret_cast<uint64_t*>(P2V(pd[pde] & PAGE_ADDR_MASK)));
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}
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kfree(pd);
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}
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kfree(pdpt);
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}
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void PageTable::load()
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{
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SpinLockGuard _(m_lock);
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ASSERT(m_highest_paging_struct < 0x100000000);
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const uint32_t pdpt_lo = m_highest_paging_struct;
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asm volatile("movl %0, %%cr3" :: "r"(pdpt_lo));
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Processor::set_current_page_table(this);
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}
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void PageTable::invalidate(vaddr_t vaddr, bool send_smp_message)
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{
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ASSERT(vaddr % PAGE_SIZE == 0);
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asm volatile("invlpg (%0)" :: "r"(vaddr) : "memory");
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if (send_smp_message)
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{
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Processor::broadcast_smp_message({
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.type = Processor::SMPMessage::Type::FlushTLB,
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.flush_tlb = {
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.vaddr = vaddr,
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.page_count = 1
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}
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});
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}
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}
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void PageTable::unmap_page(vaddr_t vaddr, bool send_smp_message)
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{
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ASSERT(vaddr);
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ASSERT(vaddr % PAGE_SIZE == 0);
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ASSERT(vaddr != fast_page());
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if (vaddr >= KERNEL_OFFSET)
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ASSERT(vaddr >= (vaddr_t)g_kernel_start);
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if ((vaddr >= KERNEL_OFFSET) != (this == s_kernel))
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Kernel::panic("unmapping {8H}, kernel: {}", vaddr, this == s_kernel);
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const uint64_t pdpte = (vaddr >> 30) & 0x1FF;
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const uint64_t pde = (vaddr >> 21) & 0x1FF;
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const uint64_t pte = (vaddr >> 12) & 0x1FF;
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SpinLockGuard _(m_lock);
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if (is_page_free(vaddr))
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Kernel::panic("trying to unmap unmapped page 0x{H}", vaddr);
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
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uint64_t* pt = reinterpret_cast<uint64_t*>(P2V(pd[pde] & PAGE_ADDR_MASK));
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pt[pte] = 0;
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invalidate(vaddr, send_smp_message);
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}
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void PageTable::unmap_range(vaddr_t vaddr, size_t size)
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{
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ASSERT(vaddr % PAGE_SIZE == 0);
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size_t page_count = range_page_count(vaddr, size);
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SpinLockGuard _(m_lock);
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for (vaddr_t page = 0; page < page_count; page++)
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unmap_page(vaddr + page * PAGE_SIZE, false);
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Processor::broadcast_smp_message({
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.type = Processor::SMPMessage::Type::FlushTLB,
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.flush_tlb = {
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.vaddr = vaddr,
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.page_count = page_count
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}
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});
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}
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void PageTable::map_page_at(paddr_t paddr, vaddr_t vaddr, flags_t flags, MemoryType memory_type, bool send_smp_message)
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{
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ASSERT(vaddr);
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ASSERT(vaddr != fast_page());
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if ((vaddr >= KERNEL_OFFSET) != (this == s_kernel))
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Kernel::panic("mapping {8H} to {8H}, kernel: {}", paddr, vaddr, this == s_kernel);
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ASSERT(paddr % PAGE_SIZE == 0);
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ASSERT(vaddr % PAGE_SIZE == 0);
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ASSERT(flags & Flags::Used);
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const uint64_t pdpte = (vaddr >> 30) & 0x1FF;
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const uint64_t pde = (vaddr >> 21) & 0x1FF;
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const uint64_t pte = (vaddr >> 12) & 0x1FF;
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uint64_t extra_flags = 0;
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if (s_has_pge && vaddr >= KERNEL_OFFSET) // Map kernel memory as global
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extra_flags |= 1ull << 8;
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if (s_has_nxe && !(flags & Flags::Execute))
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extra_flags |= 1ull << 63;
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if (flags & Flags::Reserved)
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extra_flags |= Flags::Reserved;
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if (memory_type == MemoryType::Uncached)
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extra_flags |= (1ull << 4);
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if (s_has_pat && memory_type == MemoryType::WriteCombining)
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extra_flags |= (1ull << 7);
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if (s_has_pat && memory_type == MemoryType::WriteThrough)
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extra_flags |= (1ull << 7) | (1ull << 3);
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// NOTE: we add present here, since it has to be available in higher level structures
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flags_t uwr_flags = (flags & (Flags::UserSupervisor | Flags::ReadWrite)) | Flags::Present;
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SpinLockGuard _(m_lock);
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uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
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if (!(pdpt[pdpte] & Flags::Present))
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pdpt[pdpte] = V2P(allocate_zeroed_page_aligned_page()) | Flags::Present;
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uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
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if ((pd[pde] & uwr_flags) != uwr_flags)
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{
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if (!(pd[pde] & Flags::Present))
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pd[pde] = V2P(allocate_zeroed_page_aligned_page());
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pd[pde] |= uwr_flags;
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}
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if (!(flags & Flags::Present))
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uwr_flags &= ~Flags::Present;
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uint64_t* pt = reinterpret_cast<uint64_t*>(P2V(pd[pde] & PAGE_ADDR_MASK));
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pt[pte] = paddr | uwr_flags | extra_flags;
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invalidate(vaddr, send_smp_message);
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}
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void PageTable::map_range_at(paddr_t paddr, vaddr_t vaddr, size_t size, flags_t flags, MemoryType memory_type)
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{
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ASSERT(vaddr);
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ASSERT(paddr % PAGE_SIZE == 0);
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ASSERT(vaddr % PAGE_SIZE == 0);
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size_t page_count = range_page_count(vaddr, size);
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SpinLockGuard _(m_lock);
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for (size_t page = 0; page < page_count; page++)
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map_page_at(paddr + page * PAGE_SIZE, vaddr + page * PAGE_SIZE, flags, memory_type, false);
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Processor::broadcast_smp_message({
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.type = Processor::SMPMessage::Type::FlushTLB,
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.flush_tlb = {
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.vaddr = vaddr,
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.page_count = page_count
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}
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});
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}
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uint64_t PageTable::get_page_data(vaddr_t vaddr) const
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{
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ASSERT(vaddr % PAGE_SIZE == 0);
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const uint64_t pdpte = (vaddr >> 30) & 0x1FF;
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const uint64_t pde = (vaddr >> 21) & 0x1FF;
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const uint64_t pte = (vaddr >> 12) & 0x1FF;
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SpinLockGuard _(m_lock);
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uint64_t* pdpt = (uint64_t*)P2V(m_highest_paging_struct);
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if (!(pdpt[pdpte] & Flags::Present))
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return 0;
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uint64_t* pd = (uint64_t*)P2V(pdpt[pdpte] & PAGE_ADDR_MASK);
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if (!(pd[pde] & Flags::Present))
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return 0;
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uint64_t* pt = (uint64_t*)P2V(pd[pde] & PAGE_ADDR_MASK);
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if (!(pt[pte] & Flags::Used))
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return 0;
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return pt[pte];
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}
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PageTable::flags_t PageTable::get_page_flags(vaddr_t vaddr) const
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{
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return parse_flags(get_page_data(vaddr));
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}
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paddr_t PageTable::physical_address_of(vaddr_t vaddr) const
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{
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uint64_t page_data = get_page_data(vaddr);
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return (page_data & PAGE_ADDR_MASK) & ~(1ull << 63);
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}
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bool PageTable::is_page_free(vaddr_t vaddr) const
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{
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ASSERT(vaddr % PAGE_SIZE == 0);
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return !(get_page_flags(vaddr) & Flags::Used);
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}
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bool PageTable::is_range_free(vaddr_t vaddr, size_t size) const
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{
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vaddr_t s_page = vaddr / PAGE_SIZE;
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vaddr_t e_page = BAN::Math::div_round_up<vaddr_t>(vaddr + size, PAGE_SIZE);
|
|
|
|
SpinLockGuard _(m_lock);
|
|
for (vaddr_t page = s_page; page < e_page; page++)
|
|
if (!is_page_free(page * PAGE_SIZE))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool PageTable::reserve_page(vaddr_t vaddr, bool only_free, bool send_smp_message)
|
|
{
|
|
SpinLockGuard _(m_lock);
|
|
ASSERT(vaddr % PAGE_SIZE == 0);
|
|
if (only_free && !is_page_free(vaddr))
|
|
return false;
|
|
map_page_at(0, vaddr, Flags::Reserved, MemoryType::Normal, send_smp_message);
|
|
return true;
|
|
}
|
|
|
|
bool PageTable::reserve_range(vaddr_t vaddr, size_t bytes, bool only_free)
|
|
{
|
|
if (size_t rem = bytes % PAGE_SIZE)
|
|
bytes += PAGE_SIZE - rem;
|
|
ASSERT(vaddr % PAGE_SIZE == 0);
|
|
|
|
SpinLockGuard _(m_lock);
|
|
if (only_free && !is_range_free(vaddr, bytes))
|
|
return false;
|
|
for (size_t offset = 0; offset < bytes; offset += PAGE_SIZE)
|
|
reserve_page(vaddr + offset, true, false);
|
|
Processor::broadcast_smp_message({
|
|
.type = Processor::SMPMessage::Type::FlushTLB,
|
|
.flush_tlb = {
|
|
.vaddr = vaddr,
|
|
.page_count = bytes / PAGE_SIZE,
|
|
}
|
|
});
|
|
return true;
|
|
}
|
|
|
|
vaddr_t PageTable::reserve_free_page(vaddr_t first_address, vaddr_t last_address)
|
|
{
|
|
if (first_address >= KERNEL_OFFSET && first_address < (vaddr_t)g_kernel_end)
|
|
first_address = (vaddr_t)g_kernel_end;
|
|
if (size_t rem = first_address % PAGE_SIZE)
|
|
first_address += PAGE_SIZE - rem;
|
|
if (size_t rem = last_address % PAGE_SIZE)
|
|
last_address -= rem;
|
|
|
|
const uint32_t s_pdpte = (first_address >> 30) & 0x1FF;
|
|
const uint32_t s_pde = (first_address >> 21) & 0x1FF;
|
|
const uint32_t s_pte = (first_address >> 12) & 0x1FF;
|
|
|
|
const uint32_t e_pdpte = (last_address >> 30) & 0x1FF;
|
|
const uint32_t e_pde = (last_address >> 21) & 0x1FF;
|
|
const uint32_t e_pte = (last_address >> 12) & 0x1FF;
|
|
|
|
SpinLockGuard _(m_lock);
|
|
|
|
// Try to find free page that can be mapped without
|
|
// allocations (page table with unused entries)
|
|
uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
|
|
for (uint32_t pdpte = s_pdpte; pdpte < 4; pdpte++)
|
|
{
|
|
if (pdpte > e_pdpte)
|
|
break;
|
|
if (!(pdpt[pdpte] & Flags::Present))
|
|
continue;
|
|
uint64_t* pd = reinterpret_cast<uint64_t*>(P2V(pdpt[pdpte] & PAGE_ADDR_MASK));
|
|
for (uint32_t pde = s_pde; pde < 512; pde++)
|
|
{
|
|
if (pdpte == e_pdpte && pde > e_pde)
|
|
break;
|
|
if (!(pd[pde] & Flags::Present))
|
|
continue;
|
|
uint64_t* pt = (uint64_t*)P2V(pd[pde] & PAGE_ADDR_MASK);
|
|
for (uint32_t pte = s_pte; pte < 512; pte++)
|
|
{
|
|
if (pdpte == e_pdpte && pde == e_pde && pte >= e_pte)
|
|
break;
|
|
if (!(pt[pte] & Flags::Used))
|
|
{
|
|
vaddr_t vaddr = 0;
|
|
vaddr |= (vaddr_t)pdpte << 30;
|
|
vaddr |= (vaddr_t)pde << 21;
|
|
vaddr |= (vaddr_t)pte << 12;
|
|
ASSERT(reserve_page(vaddr));
|
|
return vaddr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Find any free page
|
|
for (vaddr_t vaddr = first_address; vaddr < last_address; vaddr += PAGE_SIZE)
|
|
{
|
|
if (is_page_free(vaddr))
|
|
{
|
|
ASSERT(reserve_page(vaddr));
|
|
return vaddr;
|
|
}
|
|
}
|
|
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
vaddr_t PageTable::reserve_free_contiguous_pages(size_t page_count, vaddr_t first_address, vaddr_t last_address)
|
|
{
|
|
if (first_address >= KERNEL_OFFSET && first_address < (vaddr_t)g_kernel_start)
|
|
first_address = (vaddr_t)g_kernel_start;
|
|
if (size_t rem = first_address % PAGE_SIZE)
|
|
first_address += PAGE_SIZE - rem;
|
|
if (size_t rem = last_address % PAGE_SIZE)
|
|
last_address -= rem;
|
|
|
|
SpinLockGuard _(m_lock);
|
|
|
|
for (vaddr_t vaddr = first_address; vaddr < last_address;)
|
|
{
|
|
bool valid { true };
|
|
for (size_t page = 0; page < page_count; page++)
|
|
{
|
|
if (!is_page_free(vaddr + page * PAGE_SIZE))
|
|
{
|
|
vaddr += (page + 1) * PAGE_SIZE;
|
|
valid = false;
|
|
break;
|
|
}
|
|
}
|
|
if (valid)
|
|
{
|
|
ASSERT(reserve_range(vaddr, page_count * PAGE_SIZE));
|
|
return vaddr;
|
|
}
|
|
}
|
|
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
static void dump_range(vaddr_t start, vaddr_t end, PageTable::flags_t flags)
|
|
{
|
|
if (start == 0)
|
|
return;
|
|
dprintln("{}-{}: {}{}{}{}",
|
|
(void*)(start), (void*)(end - 1),
|
|
flags & PageTable::Flags::Execute ? 'x' : '-',
|
|
flags & PageTable::Flags::UserSupervisor ? 'u' : '-',
|
|
flags & PageTable::Flags::ReadWrite ? 'w' : '-',
|
|
flags & PageTable::Flags::Present ? 'r' : '-'
|
|
);
|
|
}
|
|
|
|
void PageTable::debug_dump()
|
|
{
|
|
SpinLockGuard _(m_lock);
|
|
|
|
flags_t flags = 0;
|
|
vaddr_t start = 0;
|
|
|
|
uint64_t* pdpt = reinterpret_cast<uint64_t*>(P2V(m_highest_paging_struct));
|
|
for (uint32_t pdpte = 0; pdpte < 4; pdpte++)
|
|
{
|
|
if (!(pdpt[pdpte] & Flags::Present))
|
|
{
|
|
dump_range(start, (pdpte << 30), flags);
|
|
start = 0;
|
|
continue;
|
|
}
|
|
uint64_t* pd = (uint64_t*)P2V(pdpt[pdpte] & PAGE_ADDR_MASK);
|
|
for (uint64_t pde = 0; pde < 512; pde++)
|
|
{
|
|
if (!(pd[pde] & Flags::Present))
|
|
{
|
|
dump_range(start, (pdpte << 30) | (pde << 21), flags);
|
|
start = 0;
|
|
continue;
|
|
}
|
|
uint64_t* pt = (uint64_t*)P2V(pd[pde] & PAGE_ADDR_MASK);
|
|
for (uint64_t pte = 0; pte < 512; pte++)
|
|
{
|
|
if (parse_flags(pt[pte]) != flags)
|
|
{
|
|
dump_range(start, (pdpte << 30) | (pde << 21) | (pte << 12), flags);
|
|
start = 0;
|
|
}
|
|
|
|
if (!(pt[pte] & Flags::Used))
|
|
continue;
|
|
|
|
if (start == 0)
|
|
{
|
|
flags = parse_flags(pt[pte]);
|
|
start = (pdpte << 30) | (pde << 21) | (pte << 12);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|