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-rw-r--r--arch/sparc/kernel/ivec.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ivec.S b/arch/sparc/kernel/ivec.S
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+++ b/arch/sparc/kernel/ivec.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+ /* The registers for cross calls will be:
+ *
+ * DATA 0: [low 32-bits] Address of function to call, jmp to this
+ * [high 32-bits] MMU Context Argument 0, place in %g5
+ * DATA 1: Address Argument 1, place in %g1
+ * DATA 2: Address Argument 2, place in %g7
+ *
+ * With this method we can do most of the cross-call tlb/cache
+ * flushing very quickly.
+ */
+ .align 32
+ .globl do_ivec
+ .type do_ivec,#function
+do_ivec:
+ mov 0x40, %g3
+ ldxa [%g3 + %g0] ASI_INTR_R, %g3
+ sethi %hi(KERNBASE), %g4
+ cmp %g3, %g4
+ bgeu,pn %xcc, do_ivec_xcall
+ srlx %g3, 32, %g5
+ stxa %g0, [%g0] ASI_INTR_RECEIVE
+ membar #Sync
+
+ sethi %hi(ivector_table_pa), %g2
+ ldx [%g2 + %lo(ivector_table_pa)], %g2
+ sllx %g3, 4, %g3
+ add %g2, %g3, %g3
+
+ TRAP_LOAD_IRQ_WORK_PA(%g6, %g1)
+
+ ldx [%g6], %g5
+ stxa %g5, [%g3] ASI_PHYS_USE_EC
+ stx %g3, [%g6]
+ wr %g0, 1 << PIL_DEVICE_IRQ, %set_softint
+ retry
+do_ivec_xcall:
+ mov 0x50, %g1
+ ldxa [%g1 + %g0] ASI_INTR_R, %g1
+ srl %g3, 0, %g3
+
+ mov 0x60, %g7
+ ldxa [%g7 + %g0] ASI_INTR_R, %g7
+ stxa %g0, [%g0] ASI_INTR_RECEIVE
+ membar #Sync
+ ba,pt %xcc, 1f
+ nop
+
+ .align 32
+1: jmpl %g3, %g0
+ nop
+ .size do_ivec,.-do_ivec