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aarch64: mmu: cleanups and fixes

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Major changes:

- move related functions together
- optimize add_map() not to walk the page tables *twice* on
  every loop
- properly handle leftover size when a range is already mapped
- don't overwrite existing mappings by default
- return an error when the mapping fails

and make the code clearer overall.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2021-01-20 11:25:42 -05:00 • committed by Anas Nashif
commit 7fcf5519d0
3 changed files with 179 additions and 152 deletions
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4
include/arch/arm/aarch64/arm_mmu.h
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@ -38,6 +38,7 @@
* attrs[5] : Execute Permissions privileged mode (PXN)
* attrs[6] : Execute Permissions unprivileged mode (UXN)
* attrs[7] : Mirror RO/RW permissions to EL0
* attrs[8] : Overwrite existing mapping if any
*
*/
#define MT_PERM_SHIFT 3U
@ -45,6 +46,7 @@
#define MT_P_EXECUTE_SHIFT 5U
#define MT_U_EXECUTE_SHIFT 6U
#define MT_RW_AP_SHIFT 7U
#define MT_OVERWRITE_SHIFT 8U
#define MT_RO (0U << MT_PERM_SHIFT)
#define MT_RW (1U << MT_PERM_SHIFT)
@ -61,6 +63,8 @@
#define MT_U_EXECUTE (0U << MT_U_EXECUTE_SHIFT)
#define MT_U_EXECUTE_NEVER (1U << MT_U_EXECUTE_SHIFT)
#define MT_OVERWRITE (1U << MT_OVERWRITE_SHIFT)
#define MT_P_RW_U_RW (MT_RW | MT_RW_AP_ELx | MT_P_EXECUTE_NEVER | MT_U_EXECUTE_NEVER)
#define MT_P_RW_U_NA (MT_RW | MT_RW_AP_EL_HIGHER | MT_P_EXECUTE_NEVER | MT_U_EXECUTE_NEVER)
#define MT_P_RO_U_RO (MT_RO | MT_RW_AP_ELx | MT_P_EXECUTE_NEVER | MT_U_EXECUTE_NEVER)