diff options
| -rw-r--r-- | sys/arch/arm64/arm64/locore.S | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/sys/arch/arm64/arm64/locore.S b/sys/arch/arm64/arm64/locore.S index c96ec895b8a..f59854dbd82 100644 --- a/sys/arch/arm64/arm64/locore.S +++ b/sys/arch/arm64/arm64/locore.S @@ -1,4 +1,4 @@ -/* $OpenBSD: locore.S,v 1.9 2017/02/03 10:46:19 patrick Exp $ */ +/* $OpenBSD: locore.S,v 1.10 2017/02/03 13:39:49 patrick Exp $ */ /*- * Copyright (c) 2012-2014 Andrew Turner * All rights reserved. @@ -426,6 +426,43 @@ create_pagetables: ret /* + * Builds an L0 -> L1 table descriptor + * + * This is a link for a 512GiB block of memory with up to 1GiB regions mapped + * within it by build_l1_block_pagetable. + * + * x6 = L0 table + * x8 = Virtual Address + * x9 = L1 PA (trashed) + * x10 = Entry count + * x11, x12 and x13 are trashed + */ +link_l0_pagetable: + /* + * Link an L0 -> L1 table entry. + */ + /* Find the table index */ + lsr x11, x8, #L0_SHIFT + and x11, x11, #Ln_ADDR_MASK + + /* Build the L0 block entry */ + mov x12, #L0_TABLE + + /* Only use the output address bits */ + lsr x9, x9, #PAGE_SHIFT +1: orr x13, x12, x9, lsl #PAGE_SHIFT + + /* Store the entry */ + str x13, [x6, x11, lsl #3] + + sub x10, x10, #1 + add x11, x11, #1 + add x9, x9, #1 + cbnz x10, 1b + + ret + +/* * Builds an L1 -> L2 table descriptor * * This is a link for a 1GiB block of memory with up to 2MiB regions mapped |