arm64: Hook up efi_rt_arch_call in efirt.ko

Note that this requires marking efi_rt_fault as a non-preemptible
local symbol.

Co-authored-by: Jessica Clarke <[email protected]>
Reviewed by:	imp, andrew
Obtained from:	CheriBSD
Fixes:		d7f930b ("arm64: Implement efi_rt_arch_call")
Differential Revision:	https://reviews.freebsd.org/D48715

Author: bsdjhb

sys/arm64/arm64/efirt_support.S

@@ -85,7 +85,7 @@ ENTRY(efi_rt_arch_call)
 	ret
 END(efi_rt_arch_call)
 
-ENTRY(efi_rt_fault)
+LENTRY(efi_rt_fault)
 	/* Clear pcb_onfault */
 	SET_FAULT_HANDLER(xzr, x11)
 	/* Load curthread */
@@ -96,6 +96,6 @@ ENTRY(efi_rt_fault)
 	/* Normal exit returning an error */
 	ldr	x0, =EFAULT
 	b	.Lefi_rt_arch_call_exit
-END(efi_rt_fault)
+LEND(efi_rt_fault)
 
 GNU_PROPERTY_AARCH64_FEATURE_1_NOTE(GNU_PROPERTY_AARCH64_FEATURE_1_VAL)

sys/modules/efirt/Makefile

@@ -4,16 +4,17 @@
 KMOD=	efirt
 SRCS=	efirt.c efirt_machdep.c efidev.c
 SRCS+=	efirtc.c
+SRCS+=	efirt_support.S
 SRCS+=  device_if.h bus_if.h clock_if.h
+DPSRCS+= assym.inc
 
 .if ${MACHINE_CPUARCH} == "amd64"
 SRCS+=	opt_hwpmc_hooks.h opt_kstack_pages.h
-SRCS+=	efirt_support.S
-DPSRCS+= assym.inc
+.endif
+
 efirt_support.o:	efirt_support.S assym.inc
 	${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
 	    ${.IMPSRC} -o ${.TARGET}
-.endif
 
 EXPORT_SYMS=	YES