[POWERPC] Provide a way to protect 4k subpages when using 64k pages

[karo-tx-linux.git] / arch / powerpc / mm / hash_low_64.S

diff --git a/arch/powerpc/mm/hash_low_64.S b/arch/powerpc/mm/hash_low_64.S
index e935edd6b72b44645ddf9a6d82af9c8e0b02c13b..21d248486479e29b2f6e59d026b29e812ab26c67 100644 (file)
--- a/arch/powerpc/mm/hash_low_64.S
+++ b/arch/powerpc/mm/hash_low_64.S
@@ -331,7 +331,8 @@ htab_pte_insert_failure:
  *****************************************************************************/
 
 /* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
- *              pte_t *ptep, unsigned long trap, int local, int ssize)
+ *              pte_t *ptep, unsigned long trap, int local, int ssize,
+ *              int subpg_prot)
  */
 
 /*
@@ -429,12 +430,19 @@ END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
        xor     r28,r28,r0              /* hash */
 
        /* Convert linux PTE bits into HW equivalents */
-4:     andi.   r3,r30,0x1fe            /* Get basic set of flags */
-       xori    r3,r3,HPTE_R_N          /* _PAGE_EXEC -> NOEXEC */
+4:
+#ifdef CONFIG_PPC_SUBPAGE_PROT
+       andc    r10,r30,r10
+       andi.   r3,r10,0x1fe            /* Get basic set of flags */
+       rlwinm  r0,r10,32-9+1,30,30     /* _PAGE_RW -> _PAGE_USER (r0) */
+#else
+       andi.   r3,r30,0x1fe            /* Get basic set of flags */
        rlwinm  r0,r30,32-9+1,30,30     /* _PAGE_RW -> _PAGE_USER (r0) */
+#endif
+       xori    r3,r3,HPTE_R_N          /* _PAGE_EXEC -> NOEXEC */
        rlwinm  r4,r30,32-7+1,30,30     /* _PAGE_DIRTY -> _PAGE_USER (r4) */
        and     r0,r0,r4                /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
-       andc    r0,r30,r0               /* r0 = pte & ~r0 */
+       andc    r0,r3,r0                /* r0 = pte & ~r0 */
        rlwimi  r3,r0,32-1,31,31        /* Insert result into PP lsb */
        ori     r3,r3,HPTE_R_C          /* Always add "C" bit for perf. */