diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2018-03-26 15:34:48 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-31 00:10:38 +1100 |
| commit | f384796c40dc55b3dba25e0ee9c1afd98c6d24d1 (patch) | |
| tree | 400e1127554c05abff89a9d09bac2b40f844eba7 /arch/powerpc/mm/slb_low.S | |
| parent | 0dea04b288c06654b0de3563c5b8cdfe6130e450 (diff) | |
powerpc/mm: Add support for handling > 512TB address in SLB miss
For addresses above 512TB we allocate additional mmu contexts. To make
it all easy, addresses above 512TB are handled with IR/DR=1 and with
stack frame setup.
The mmu_context_t is also updated to track the new extended_ids. To
support upto 4PB we need a total 8 contexts.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Minor formatting tweaks and comment wording, switch BUG to WARN
in get_ea_context().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/slb_low.S')
| -rw-r--r-- | arch/powerpc/mm/slb_low.S | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S index 2c7c717fd2ea..a83fbd2a4a24 100644 --- a/arch/powerpc/mm/slb_low.S +++ b/arch/powerpc/mm/slb_low.S @@ -75,10 +75,15 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_68_BIT_VA) */ _GLOBAL(slb_allocate) /* - * check for bad kernel/user address - * (ea & ~REGION_MASK) >= PGTABLE_RANGE + * Check if the address falls within the range of the first context, or + * if we may need to handle multi context. For the first context we + * allocate the slb entry via the fast path below. For large address we + * branch out to C-code and see if additional contexts have been + * allocated. + * The test here is: + * (ea & ~REGION_MASK) >= (1ull << MAX_EA_BITS_PER_CONTEXT) */ - rldicr. r9,r3,4,(63 - H_PGTABLE_EADDR_SIZE - 4) + rldicr. r9,r3,4,(63 - MAX_EA_BITS_PER_CONTEXT - 4) bne- 8f srdi r9,r3,60 /* get region */ |