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vm: implement B_RANDOMIZED_BASE_ADDRESS address specification

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B_RAND_BASE_ADDRESS is basically B_BASE_ADDRESS with non-deterministic created
area's base address.

Initial start address is randomized and then the algorithm looks for a large
enough free space in the interval [randomized start, end]. If it fails then
the search is repeated in the interval [original start, randomized start]. In
case it also fails the algorithm falls back to B_ANY_ADDRESS
(B_RANDOMIZED_ANY_ADDRESS when it is implemented) just like B_BASE_ADDRESS does.

Randomization range is limited by kMaxRandomize and kMaxInitialRandomize.
This commit is contained in:
Pawel Dziepak
2013-04-04 15:16:21 +02:00
parent 3b4269ecf5
commit f9bab525f6
4 changed files with 109 additions and 9 deletions
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headers/os/kernel/OS.h
+8 -5
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@@ -73,11 +73,14 @@ typedef struct area_info {
#define B_32_BIT_CONTIGUOUS 6 /* B_CONTIGUOUS, < 4 GB physical address */
/* address spec for create_area(), and clone_area() */
#define B_ANY_ADDRESS 0
#define B_EXACT_ADDRESS 1
#define B_BASE_ADDRESS 2
#define B_CLONE_ADDRESS 3
#define B_ANY_KERNEL_ADDRESS 4
#define B_ANY_ADDRESS 0
#define B_EXACT_ADDRESS 1
#define B_BASE_ADDRESS 2
#define B_CLONE_ADDRESS 3
#define B_ANY_KERNEL_ADDRESS 4
/* B_ANY_KERNEL_BLOCK_ADDRESS 5 */
/* B_RANDOMIZED_ANY_ADDRESS 6 */
#define B_RANDOMIZED_BASE_ADDRESS 7
/* area protection */
#define B_READ_AREA 1