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| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-04-22 10:06:45 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-06-03 02:37:28 (GMT) |
| commit | 5b2753fc3e8a72253310d01a8b0a5bb05d917ef8 (patch) | |
| tree | d4d7b44ddaf5d49b59ae27dce318961ef8cf7906 /arch/powerpc/include/asm/cputable.h | |
| parent | e0a8e0d90a9f0be66ba49f4f2380a63c22d4aaae (diff) | |
| download | linux-5b2753fc3e8a72253310d01a8b0a5bb05d917ef8.tar.xz | |
powerpc/8xx: Implementation of PAGE_EXEC
This patch implements PAGE_EXEC capability on the 8xx.
All pages PP exec bits are set to 000, which means Execute for
Supervisor and no Execute for User.
Then we use the APG to say whether accesses are according to Page
rules, "all Supervisor" rules (Exec for all) and
"all User" rules (Exec for noone)
Therefore, we define 4 APG groups. msb is _PAGE_EXEC,
lsb is _PAGE_USER. MI_AP is initialised as follows:
GP0 (00) => Not User, no exec => 11 (all accesses performed as user)
GP1 (01) => User but no exec => 11 (all accesses performed as user)
GP2 (10) => Not User, exec => 01 (rights according to page definition)
GP3 (11) => User, exec => 00 (all accesses performed as supervisor)
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood: comments: s/exec/data/ on data side, and s/pages/pages'/]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/include/asm/cputable.h')
| -rw-r--r-- | arch/powerpc/include/asm/cputable.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h index 6367b83..ae1fa65 100644 --- a/arch/powerpc/include/asm/cputable.h +++ b/arch/powerpc/include/asm/cputable.h @@ -366,7 +366,7 @@ enum { CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | \ CPU_FTR_COMMON | CPU_FTR_FPU_UNAVAILABLE) #define CPU_FTRS_CLASSIC32 (CPU_FTR_COMMON | CPU_FTR_USE_TB) -#define CPU_FTRS_8XX (CPU_FTR_USE_TB) +#define CPU_FTRS_8XX (CPU_FTR_USE_TB | CPU_FTR_NOEXECUTE) #define CPU_FTRS_40X (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE) #define CPU_FTRS_44X (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE) #define CPU_FTRS_440x6 (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE | \ |