MIPS: Export some tlbex internals for KVM to use

Export to TLB exception code generating functions so that KVM can
construct a fast TLB refill handler for guest context without
reinventing the wheel quite so much.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/mips/include/asm/tlbex.h b/arch/mips/include/asm/tlbex.h
new file mode 100644
index 000000000000..53050e9dd2c9
--- /dev/null
+++ b/arch/mips/include/asm/tlbex.h
@@ -0,0 +1,26 @@
+#ifndef __ASM_TLBEX_H
+#define __ASM_TLBEX_H
+
+#include <asm/uasm.h>
+
+/*
+ * Write random or indexed TLB entry, and care about the hazards from
+ * the preceding mtc0 and for the following eret.
+ */
+enum tlb_write_entry {
+	tlb_random,
+	tlb_indexed
+};
+
+extern int pgd_reg;
+
+void build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
+		      unsigned int tmp, unsigned int ptr);
+void build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr);
+void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr);
+void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep);
+void build_tlb_write_entry(u32 **p, struct uasm_label **l,
+			   struct uasm_reloc **r,
+			   enum tlb_write_entry wmode);
+
+#endif /* __ASM_TLBEX_H */