1 files changed, 51 insertions, 0 deletions

diff --git a/arch/sparc/kernel/ivec.S b/arch/sparc/kernel/ivec.S
new file mode 100644
index 000000000000..d29f92ebca5e
--- /dev/null
+++ b/arch/sparc/kernel/ivec.S
@@ -0,0 +1,51 @@
+        /* 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