4 files changed, 108 insertions, 0 deletions
diff --git a/purgatory/Makefile b/purgatory/Makefile
index 1945702..0c85da6 100644
--- a/purgatory/Makefile
+++ b/purgatory/Makefile
@@ -18,6 +18,7 @@ dist += purgatory/Makefile $(PURGATORY_SRCS)				\
 
 include $(srcdir)/purgatory/arch/alpha/Makefile
 include $(srcdir)/purgatory/arch/arm/Makefile
+include $(srcdir)/purgatory/arch/arm64/Makefile
 include $(srcdir)/purgatory/arch/i386/Makefile
 include $(srcdir)/purgatory/arch/ia64/Makefile
 include $(srcdir)/purgatory/arch/mips/Makefile
diff --git a/purgatory/arch/arm64/Makefile b/purgatory/arch/arm64/Makefile
new file mode 100644
index 0000000..4749715
--- /dev/null
+++ b/purgatory/arch/arm64/Makefile
@@ -0,0 +1,18 @@
+
+arm64_PURGATORY_EXTRA_CFLAGS = \
+	-mcmodel=large \
+	-Wl,-Map=purgatory/purgatory.map \
+	-fno-stack-protector \
+	-Wundef \
+	-Werror-implicit-function-declaration \
+	-Wdeclaration-after-statement \
+	-Werror=implicit-int \
+	-Werror=strict-prototypes
+
+arm64_PURGATORY_SRCS += \
+	purgatory/arch/arm64/entry.S \
+	purgatory/arch/arm64/purgatory-arm64.c
+
+dist += \
+	$(arm64_PURGATORY_SRCS) \
+	purgatory/arch/arm64/Makefile
diff --git a/purgatory/arch/arm64/entry.S b/purgatory/arch/arm64/entry.S
new file mode 100644
index 0000000..140e91d
--- /dev/null
+++ b/purgatory/arch/arm64/entry.S
@@ -0,0 +1,54 @@
+/*
+ * ARM64 purgatory.
+ */
+
+.macro	debug_brk
+	mov	x0, #0x18;		/* angel_SWIreason_ReportException */
+	mov	x1, #0x20000;
+	add	x1, x1, #0x20;		/* ADP_Stopped_BreakPoint */
+	hlt	#0xf000			/* A64 semihosting */
+.endm
+
+.macro	size, sym:req
+	.size \sym, . - \sym
+.endm
+
+.text
+
+.globl purgatory_start
+purgatory_start:
+
+	adr	x19, .Lstack
+	mov	sp, x19
+
+	bl	purgatory
+
+1:	debug_brk
+	b	1b
+
+size purgatory_start 
+
+.align 4
+	.rept	256
+	.quad	0
+	.endr
+.Lstack:
+
+.data
+
+.align 3
+
+.globl arm64_sink
+arm64_sink:
+	.quad	0
+size arm64_sink
+
+.globl arm64_kernel_entry
+arm64_kernel_entry:
+	.quad	0
+size arm64_kernel_entry
+
+.globl arm64_dtb_addr
+arm64_dtb_addr:
+	.quad	0
+size arm64_dtb_addr
diff --git a/purgatory/arch/arm64/purgatory-arm64.c b/purgatory/arch/arm64/purgatory-arm64.c
new file mode 100644
index 0000000..25960c3
--- /dev/null
+++ b/purgatory/arch/arm64/purgatory-arm64.c
@@ -0,0 +1,35 @@
+/*
+ * ARM64 purgatory.
+ */
+
+#include <stdint.h>
+#include <purgatory.h>
+
+/* Symbols set by kexec. */
+
+extern uint32_t *arm64_sink;
+extern void (*arm64_kernel_entry)(uint64_t);
+extern uint64_t arm64_dtb_addr;
+
+void putchar(int ch)
+{
+	if (!arm64_sink)
+		return;
+
+	*arm64_sink = ch;
+
+	if (ch == '\n')
+		*arm64_sink = '\r';
+}
+
+void setup_arch(void)
+{
+	printf("purgatory: kernel_entry: %lx\n",
+		(unsigned long)arm64_kernel_entry);
+	printf("purgatory: dtb:          %lx\n", arm64_dtb_addr);
+}
+
+void post_verification_setup_arch(void)
+{
+	arm64_kernel_entry(arm64_dtb_addr);
+}