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Give each task its own page directory.

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This isn't finished but I'll commit as I go. We need to get to where context
switching only needs to change CR3 and everything's ready to go.

My basic idea is:
- The first 4 kB is off-limits. This catches null dereferences.
- Up to the 4 MB mark is identity-mapped and kernel-only.
- The rest is available to everyone!

While the first 4 MB is only available to the kernel, it's still mapped in
every process, for convenience when entering the kernel.
This commit is contained in:
Andreas Kling 2018-11-01 09:01:51 +01:00
parent cddd2f37e9
commit 1da0a7c949
7 changed files with 47 additions and 15 deletions
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4
Kernel/ProcFileSystem.cpp
View file

@ -172,9 +172,9 @@ ByteBuffer procfs$mounts()
ByteBuffer procfs$kmalloc()
{
InterruptDisabler disabler;
auto buffer = ByteBuffer::createUninitialized(128);
auto buffer = ByteBuffer::createUninitialized(256);
char* ptr = (char*)buffer.pointer();
ptr += ksprintf(ptr, "eternal: %u\nallocated: %u\nfree: %u\n", kmalloc_sum_eternal, sum_alloc, sum_free);
ptr += ksprintf(ptr, "eternal: %u\npage-aligned: %u\nallocated: %u\nfree: %u\n", kmalloc_sum_eternal, sum_alloc, sum_free);
buffer.trim(ptr - (char*)buffer.pointer());
return buffer;
}