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7 commits

Author SHA1 Message Date
Jonas 'Sortie' Termansen
2e3d7c45af Add paging no-execute and write protection support.
Enable the NX bit on x86_64 and set if not PROT_EXEC and enable the write
protection mode (CR0.WP) that disables the default behavior where the kernel
is able to write to read-only memory. Fix kernel broken assumptions it can
access read-only memory and take care to never set PROT_KWRITE on user-space
pages unless PROT_WRITE is also set, otherwise user-space will be able to
write to read-only memory.

This achieves X^W in the whole system except for the core kernel itself as
it is currently don't know the purpose of pages when identity mapping the
first 4 MiB.
2016-01-25 17:39:57 +01:00
Jonas 'Sortie' Termansen
dad5c57f33 Allow bootloader bitmap framebuffer modesetting. 2016-01-08 19:56:11 +01:00
Jonas 'Sortie' Termansen
218875eb79 Initialize paging before KernelInit. 2015-08-21 21:25:00 +02:00
Jonas 'Sortie' Termansen
a422c394b8 Initialize the GDT in the bootstrap assembly. 2015-08-21 21:25:00 +02:00
Jonas 'Sortie' Termansen
524a028a4f Forward compatibility with future rename of _start to __start. 2014-12-28 20:18:58 +01:00
Jonas 'Sortie' Termansen
25e07a9083 Refactor kernel interrupt and thread register support. 2014-11-18 20:33:21 +01:00
Jonas 'Sortie' Termansen
6788f0096e Preprocess assembly files with the C preprocessor. 2014-03-01 14:37:40 +01:00
Renamed from kernel/x64/boot.s (Browse further)