[PATCH v4 3/9] arm64: identify PHYS_OFFSET correctly

[AKASHI Takahiro]

Due to the kernel patch, commit e7cd190385d1 ("arm64: mark reserved
memblock regions explicitly in iomem"), the current code will not be able
to identify the correct value of PHYS_OFFSET if some "reserved" memory
region, which is likely to be UEFI runtime services code/data, exists at
an address below the first "System RAM" regions.

This patch fixes this issue.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 kexec/arch/arm64/iomem.h       |  7 +++++++
 kexec/arch/arm64/kexec-arm64.c | 12 ++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 kexec/arch/arm64/iomem.h

diff --git a/kexec/arch/arm64/iomem.h b/kexec/arch/arm64/iomem.h
new file mode 100644
index 0000000..7fd66eb
--- /dev/null
+++ b/kexec/arch/arm64/iomem.h
@@ -0,0 +1,7 @@
+#ifndef IOMEM_H
+#define IOMEM_H
+
+#define SYSTEM_RAM		"System RAM\n"
+#define IOMEM_RESERVED		"reserved\n"
+
+#endif
diff --git a/kexec/arch/arm64/kexec-arm64.c b/kexec/arch/arm64/kexec-arm64.c
index 2e8839a..8ac811d 100644
--- a/kexec/arch/arm64/kexec-arm64.c
+++ b/kexec/arch/arm64/kexec-arm64.c
@@ -21,6 +21,7 @@
 #include "crashdump-arm64.h"
 #include "dt-ops.h"
 #include "fs2dt.h"
+#include "iomem.h"
 #include "kexec-syscall.h"
 #include "arch/options.h"
 
@@ -475,7 +476,14 @@ static int get_memory_ranges_iomem_cb(void *data, int nr, char *str,
 		return -1;
 
 	r = (struct memory_range *)data + nr;
-	r->type = RANGE_RAM;
+
+	if (!strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)))
+		r->type = RANGE_RAM;
+	else if (!strncmp(str, IOMEM_RESERVED, strlen(IOMEM_RESERVED)))
+		r->type = RANGE_RESERVED;
+	else
+		return 1;
+
 	r->start = base;
 	r->end = base + length - 1;
 
@@ -494,7 +502,7 @@ static int get_memory_ranges_iomem_cb(void *data, int nr, char *str,
 static int get_memory_ranges_iomem(struct memory_range *array,
 	unsigned int *count)
 {
-	*count = kexec_iomem_for_each_line("System RAM\n",
+	*count = kexec_iomem_for_each_line(NULL,
 		get_memory_ranges_iomem_cb, array);
 
 	if (!*count) {
-- 
2.10.0