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powerpc/mm/32s: use _PAGE_EXEC in setbat()

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Do not set IBAT when setbat() is called without _PAGE_EXEC

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-02-21 19:08:43 +00:00 committed by Michael Ellerman
parent 160985f302
commit df25f86390
1 changed files with 6 additions and 4 deletions
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10
arch/powerpc/mm/ppc_mmu_32.c
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@ -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)