mirror of
https://github.com/LadybirdBrowser/ladybird.git
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94ca55cefd
As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
120 lines
4.9 KiB
C++
120 lines
4.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Random.h>
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#include <Kernel/Thread.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PageDirectory.h>
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static const u32 userspace_range_base = 0x00800000;
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static const u32 userspace_range_ceiling = 0xbe000000;
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static const u32 kernelspace_range_base = 0xc0800000;
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static HashMap<u32, PageDirectory*>& cr3_map()
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{
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ASSERT_INTERRUPTS_DISABLED();
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static HashMap<u32, PageDirectory*>* map;
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if (!map)
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map = new HashMap<u32, PageDirectory*>;
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return *map;
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}
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RefPtr<PageDirectory> PageDirectory::find_by_cr3(u32 cr3)
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{
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InterruptDisabler disabler;
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return cr3_map().get(cr3).value_or({});
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}
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extern "C" PageDirectoryEntry* boot_pdpt[4];
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extern "C" PageDirectoryEntry boot_pd0[1024];
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extern "C" PageDirectoryEntry boot_pd3[1024];
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PageDirectory::PageDirectory()
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{
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m_range_allocator.initialize_with_range(VirtualAddress(0xc0800000), 0x3f000000);
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// Adopt the page tables already set up by boot.S
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PhysicalAddress boot_pdpt_paddr(virtual_to_low_physical((u32)boot_pdpt));
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PhysicalAddress boot_pd0_paddr(virtual_to_low_physical((u32)boot_pd0));
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PhysicalAddress boot_pd3_paddr(virtual_to_low_physical((u32)boot_pd3));
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kprintf("MM: boot_pdpt @ P%p\n", boot_pdpt_paddr.get());
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kprintf("MM: boot_pd0 @ P%p\n", boot_pd0_paddr.get());
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kprintf("MM: boot_pd3 @ P%p\n", boot_pd3_paddr.get());
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m_directory_table = PhysicalPage::create(boot_pdpt_paddr, true, false);
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m_directory_pages[0] = PhysicalPage::create(boot_pd0_paddr, true, false);
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m_directory_pages[3] = PhysicalPage::create(boot_pd3_paddr, true, false);
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}
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PageDirectory::PageDirectory(Process& process, const RangeAllocator* parent_range_allocator)
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: m_process(&process)
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{
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if (parent_range_allocator) {
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m_range_allocator.initialize_from_parent(*parent_range_allocator);
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} else {
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size_t random_offset = (get_good_random<u32>() % 32 * MB) & PAGE_MASK;
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u32 base = userspace_range_base + random_offset;
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m_range_allocator.initialize_with_range(VirtualAddress(base), userspace_range_ceiling - base);
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}
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// Set up a userspace page directory
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m_directory_table = MM.allocate_user_physical_page();
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m_directory_pages[0] = MM.allocate_user_physical_page();
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m_directory_pages[1] = MM.allocate_user_physical_page();
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m_directory_pages[2] = MM.allocate_user_physical_page();
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// Share the top 1 GB of kernel-only mappings (>=3GB or >=0xc0000000)
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m_directory_pages[3] = MM.kernel_page_directory().m_directory_pages[3];
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{
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InterruptDisabler disabler;
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auto& table = *(PageDirectoryPointerTable*)MM.quickmap_page(*m_directory_table);
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table.raw[0] = (u64)m_directory_pages[0]->paddr().as_ptr() | 1;
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table.raw[1] = (u64)m_directory_pages[1]->paddr().as_ptr() | 1;
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table.raw[2] = (u64)m_directory_pages[2]->paddr().as_ptr() | 1;
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table.raw[3] = (u64)m_directory_pages[3]->paddr().as_ptr() | 1;
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MM.unquickmap_page();
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}
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// Clone bottom 2 MB of mappings from kernel_page_directory
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PageDirectoryEntry buffer;
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auto* kernel_pd = MM.quickmap_pd(MM.kernel_page_directory(), 0);
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memcpy(&buffer, kernel_pd, sizeof(PageDirectoryEntry));
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auto* new_pd = MM.quickmap_pd(*this, 0);
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memcpy(new_pd, &buffer, sizeof(PageDirectoryEntry));
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InterruptDisabler disabler;
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cr3_map().set(cr3(), this);
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}
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PageDirectory::~PageDirectory()
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{
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#ifdef MM_DEBUG
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dbgprintf("MM: ~PageDirectory K%x\n", this);
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#endif
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InterruptDisabler disabler;
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cr3_map().remove(cr3());
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}
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