[powerpc v4 1/3] Setup AMOR in HV mode
From: Balbir Singh <bsingharora@gmail.com>
Date: 2016-11-14 05:25:30
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
AMOR should be setup in HV mode, we set it up once and let the generic kernel handle IAMR. This patch is used to enable storage keys in a following patch as defined in ISA 3 Reported-by: Aneesh Kumar K.V <redacted> Signed-off-by: Balbir Singh <bsingharora@gmail.com> --- arch/powerpc/mm/pgtable-radix.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index ed7bddc..7343573 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c@@ -320,6 +320,25 @@ static void update_hid_for_radix(void) cpu_relax(); } +/* + * In HV mode, we init AMOR so that the hypervisor + * and guest can setup IMAR, enable key 0 and set + * it to 1 + * AMOR = 1100....00 (Mask for key 0 is 11) + */ +static void __init radix_init_amor(void) +{ + unsigned long amor_mask = 0xc000000000000000; + unsigned long amor = mfspr(SPRN_AMOR); + + if (cpu_has_feature(CPU_FTR_POWER9_DD1)) + return; + + amor = amor_mask; + + mtspr(SPRN_AMOR, amor); +} + void __init radix__early_init_mmu(void) { unsigned long lpcr;
@@ -376,6 +395,7 @@ void __init radix__early_init_mmu(void) lpcr = mfspr(SPRN_LPCR); mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR); radix_init_partition_table(); + radix_init_amor(); } radix_init_pgtable();
@@ -393,6 +413,7 @@ void radix__early_init_mmu_secondary(void) mtspr(SPRN_PTCR, __pa(partition_tb) | (PATB_SIZE_SHIFT - 12)); + radix_init_amor(); } }
--
2.5.5