[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] xen/arm: p2m: Enable support for 32bit IPA for ARM_32
commit 7a25a1501ca941c3e01b0c4e624ace05417f1587 Author: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx> AuthorDate: Fri Jun 2 13:07:54 2023 +0100 Commit: Julien Grall <jgrall@xxxxxxxxxx> CommitDate: Fri Jun 16 21:36:35 2023 +0100 xen/arm: p2m: Enable support for 32bit IPA for ARM_32 Refer ARM DDI 0406C.d ID040418, B3-1345, "A stage 2 translation with an input address range of 31-34 bits can start the translation either: - With a first-level lookup, accessing a first-level translation table with 2-16 entries. - With a second-level lookup, accessing a set of concatenated second-level translation tables" Thus, for 32 bit IPA, there will be no concatenated root level tables. So, the root-order is 0. Also, Refer ARM DDI 0406C.d ID040418, B3-1348 "Determining the required first lookup level for stage 2 translations For a stage 2 translation, the output address range from the stage 1 translations determines the required input address range for the stage 2 translation. The permitted values of VTCR.SL0 are: 0b00 Stage 2 translation lookup must start at the second level. 0b01 Stage 2 translation lookup must start at the first level. VTCR.T0SZ must indicate the required input address range. The size of the input address region is 2^(32-T0SZ) bytes." Thus VTCR.SL0 = 1 (maximum value) and VTCR.T0SZ = 0 when the size of input address region is 2^32 bytes. Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx> Acked-by: Julien Grall <jgrall@xxxxxxxxxx> --- xen/arch/arm/p2m.c | 1 + 1 file changed, 1 insertion(+) diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c index d671a39457..de32a2d638 100644 --- a/xen/arch/arm/p2m.c +++ b/xen/arch/arm/p2m.c @@ -2265,6 +2265,7 @@ void __init setup_virt_paging(void) [6] = { 52, 12/*12*/, 4, 2 }, [7] = { 0 } /* Invalid */ #else + { 32, 0/*0*/, 0, 1 }, { 40, 24/*24*/, 1, 1 } #endif }; -- generated by git-patchbot for /home/xen/git/xen.git#master
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