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MM: Allocate page tables from a separate set of physical pages.

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The old approach only worked because of an overpermissive accident.
There's now a concept of supervisor physical pages that can be allocated.
They all sit in the low 4 MB of physical memory and are identity mapped,
shared between all processes, and only ring 0 can access them.
This commit is contained in:
Andreas Kling 2019-01-01 02:09:43 +01:00
parent a5ffa2eec7
commit 683185e4aa
5 changed files with 65 additions and 105 deletions
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4
Kernel/Process.cpp
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@ -336,6 +336,8 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
bool success = loader.load();
if (!success) {
m_page_directory = move(old_page_directory);
// FIXME: RAII this somehow instead.
ASSERT(current == this);
MM.enter_process_paging_scope(*this);
m_regions = move(old_regions);
kprintf("sys$execve: Failure loading %s\n", path.characters());
@ -345,6 +347,8 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
entry_eip = loader.entry().get();
if (!entry_eip) {
m_page_directory = move(old_page_directory);
// FIXME: RAII this somehow instead.
ASSERT(current == this);
MM.enter_process_paging_scope(*this);
m_regions = move(old_regions);
return -ENOEXEC;