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Kernel: Add mapping from page directory base (PDB) to PageDirectory

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This allows the page fault code to find the owning PageDirectory and
corresponding process for faulting regions.

The mapping is implemented as a global hash map right now, which is
definitely not optimal. We can come up with something better when it
becomes necessary.
This commit is contained in:
Andreas Kling
2019-08-06 11:19:16 +02:00
parent 8d07bce12a
commit 2ad963d261
5 changed files with 60 additions and 16 deletions
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4
Kernel/Process.cpp
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@@ -333,7 +333,7 @@ int Process::do_exec(String path, Vector<String> arguments, Vector<String> envir
u32 entry_eip = 0;
// FIXME: Is there a race here?
auto old_page_directory = move(m_page_directory);
m_page_directory = PageDirectory::create_for_userspace();
m_page_directory = PageDirectory::create_for_userspace(*this);
#ifdef MM_DEBUG
dbgprintf("Process %u exec: PD=%x created\n", pid(), m_page_directory.ptr());
#endif
@@ -590,7 +590,7 @@ Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring
{
dbgprintf("Process: New process PID=%u with name=%s\n", m_pid, m_name.characters());
m_page_directory = PageDirectory::create_for_userspace(fork_parent ? &fork_parent->page_directory().range_allocator() : nullptr);
m_page_directory = PageDirectory::create_for_userspace(*this, fork_parent ? &fork_parent->page_directory().range_allocator() : nullptr);
#ifdef MM_DEBUG
dbgprintf("Process %u ctor: PD=%x created\n", pid(), m_page_directory.ptr());
#endif