sravan/system76-coreboot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cpu/x86: expose and add paging helper functions

Browse Source 
Add the following functions for use outside of the paging module:

void paging_enable_pae_cr3(uintptr_t cr3);
void paging_enable_pae(void);
void paging_disable_pae(void);

The functions just enable and/or disable paging along with PAE.
Disassembly shows equivalent output for both versions.

BUG=b:72728953

Change-Id: I9665e7ec4795a5f52889791f73cf98a8f4def827
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/25714
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Justin TerAvest <teravest@chromium.org>
This commit is contained in:
Aaron Durbin
2018-04-17 14:35:48 -06:00
committed by Patrick Georgi
parent ae18f80feb
commit d5e4746cf8
2 changed files with 50 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/include/cpu/x86/pae.h
View File

@@ -3,6 +3,14 @@
#include <stdint.h>
/* Enable paging with cr3 value for page directory pointer table as well as PAE
option in cr4. */
void paging_enable_pae_cr3(uintptr_t cr3);
/* Enable paging as well as PAE option in cr4. */
void paging_enable_pae(void);
/* Disable paging as well as PAE option in cr4. */
void paging_disable_pae(void);
/* Set/Clear NXE bit in IA32_EFER MSR */
void paging_set_nxe(int enable);