[PATCH v4 07/16] powerpc/mm/32s: use _PAGE_EXEC in setbat()
From: Christophe Leroy <hidden>
Date: 2019-02-21 08:05:50
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Do not set IBAT when setbat() is called without _PAGE_EXEC Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/mm/ppc_mmu_32.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 5fc59b195fef..ff8580c6ab11 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c@@ -131,6 +131,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) * Set up one of the I/D BAT (block address translation) register pairs. * The parameters are not checked; in particular size must be a power * of 2 between 128k and 256M. + * On 603+, only set IBAT when _PAGE_EXEC is set */ void __init setbat(int index, unsigned long virt, phys_addr_t phys, unsigned int size, pgprot_t prot)
@@ -157,11 +158,12 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys, bat[1].batu |= 1; /* Vp = 1 */ if (flags & _PAGE_GUARDED) { /* G bit must be zero in IBATs */ - bat[0].batu = bat[0].batl = 0; - } else { - /* make IBAT same as DBAT */ - bat[0] = bat[1]; + flags &= ~_PAGE_EXEC; } + if (flags & _PAGE_EXEC) + bat[0] = bat[1]; + else + bat[0].batu = bat[0].batl = 0; } else { /* 601 cpu */ if (bl > BL_8M)
--
2.13.3