diff options
| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-04-22 12:06:45 +0200 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-06-02 21:37:28 -0500 |
| commit | 5b2753fc3e8a72253310d01a8b0a5bb05d917ef8 (patch) | |
| tree | d4d7b44ddaf5d49b59ae27dce318961ef8cf7906 /arch/powerpc/kernel | |
| parent | e0a8e0d90a9f0be66ba49f4f2380a63c22d4aaae (diff) | |
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/kernel')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index c79184d86f58..78c1eba4c04a 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -357,7 +357,7 @@ InstructionTLBMiss: lwz r10, 0(r10) /* Get the pte */ /* Insert the APG into the TWC from the Linux PTE. */ - rlwimi r11, r10, 0, 26, 26 + rlwimi r11, r10, 0, 25, 26 /* Load the MI_TWC with the attributes for this "segment." */ MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */ @@ -449,6 +449,7 @@ DataStoreTLBMiss: */ li r11, RPN_PATTERN rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */ + rlwimi r10, r11, 0, 20, 20 /* clear 20 */ MTSPR_CPU6(SPRN_MD_RPN, r10, r3) /* Update TLB entry */ /* Restore registers */ @@ -769,15 +770,20 @@ initial_mmu: ori r8, r8, MI_EVALID /* Mark it valid */ mtspr SPRN_MI_EPN, r8 mtspr SPRN_MD_EPN, r8 - li r8, MI_PS8MEG /* Set 8M byte page */ + li r8, MI_PS8MEG | (2 << 5) /* Set 8M byte page, APG 2 */ ori r8, r8, MI_SVALID /* Make it valid */ mtspr SPRN_MI_TWC, r8 + li r8, MI_PS8MEG /* Set 8M byte page, APG 0 */ + ori r8, r8, MI_SVALID /* Make it valid */ mtspr SPRN_MD_TWC, r8 li r8, MI_BOOTINIT /* Create RPN for address 0 */ mtspr SPRN_MI_RPN, r8 /* Store TLB entry */ mtspr SPRN_MD_RPN, r8 - lis r8, MI_Kp@h /* Set the protection mode */ + lis r8, MI_APG_INIT@h /* Set protection modes */ + ori r8, r8, MI_APG_INIT@l mtspr SPRN_MI_AP, r8 + lis r8, MD_APG_INIT@h + ori r8, r8, MD_APG_INIT@l mtspr SPRN_MD_AP, r8 /* Map another 8 MByte at the IMMR to get the processor |