[PATCH 3/8] add mem64_min/max control

[Yinghai Lu <yinghai@kernel.org>]

So could limit range for 4g above buffers.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 kexec/kexec.c |   26 ++++++++++++++++++++++++++
 kexec/kexec.h |    9 ++++++++-
 2 files changed, 34 insertions(+), 1 deletions(-)

diff --git a/kexec/kexec.c b/kexec/kexec.c
index 8928be0..00f90f5 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -50,6 +50,8 @@
 
 unsigned long long mem_min = 0;
 unsigned long long mem_max = ULONG_MAX;
+unsigned long long mem64_min = 1ULL<32;
+unsigned long long mem64_max = ULLONG_MAX;
 static unsigned long kexec_flags = 0;
 int kexec_debug = 0;
 
@@ -900,6 +902,10 @@ void usage(void)
 	       "                      load code into.\n"
 	       "     --mem-max=<addr> Specify the highest memory address to\n"
 	       "                      load code into.\n"
+	       "     --mem64-min=<addr> Specify the lowest memory address \n"
+	       "                      above 4G to load code into.\n"
+	       "     --mem64-max=<addr> Specify the highest memory address \n"
+	       "                      above 4G to load code into.\n"
 	       "     --reuseinitrd    Reuse initrd from first boot.\n"
 	       "     --load-preserve-context Load the new kernel and preserve\n"
 	       "                      context of current kernel during kexec.\n"
@@ -1165,6 +1171,26 @@ int main(int argc, char *argv[])
 				return 1;
 			}
 			break;
+		case OPT_MEM64_MIN:
+			mem64_min = strtoul(optarg, &endptr, 0);
+			if (*endptr) {
+				fprintf(stderr,
+					"Bad option value in --mem64-min=%s\n",
+					optarg);
+				usage();
+				return 1;
+			}
+			break;
+		case OPT_MEM64_MAX:
+			mem64_max = strtoul(optarg, &endptr, 0);
+			if (*endptr) {
+				fprintf(stderr,
+					"Bad option value in --mem64-max=%s\n",
+					optarg);
+				usage();
+				return 1;
+			}
+			break;
 		case OPT_REUSE_INITRD:
 			do_reuse_initrd = 1;
 			break;
diff --git a/kexec/kexec.h b/kexec/kexec.h
index 35b0b10..2e0e5f2 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -113,6 +113,7 @@ do { \
         _x > _y ? _x : _y; })
 
 extern unsigned long long mem_min, mem_max;
+extern unsigned long long mem64_min, mem64_max;
 extern int kexec_debug;
 
 #define dbgprintf(...) \
@@ -211,7 +212,11 @@ extern int file_types;
 #define OPT_LOAD_PRESERVE_CONTEXT 259
 #define OPT_LOAD_JUMP_BACK_HELPER 260
 #define OPT_ENTRY		261
-#define OPT_MAX			262
+#define OPT_MEM64_MIN           262
+#define OPT_MEM64_MAX           263
+
+#define OPT_MAX			264
+
 #define KEXEC_OPTIONS \
 	{ "help",		0, 0, OPT_HELP }, \
 	{ "version",		0, 0, OPT_VERSION }, \
@@ -227,6 +232,8 @@ extern int file_types;
 	{ "load-panic",         0, 0, OPT_PANIC }, \
 	{ "mem-min",		1, 0, OPT_MEM_MIN }, \
 	{ "mem-max",		1, 0, OPT_MEM_MAX }, \
+	{ "mem64-min",		1, 0, OPT_MEM64_MIN }, \
+	{ "mem64-max",		1, 0, OPT_MEM64_MAX }, \
 	{ "reuseinitrd",	0, 0, OPT_REUSE_INITRD }, \
 	{ "debug",		0, 0, OPT_DEBUG }, \
 
-- 
1.7.7


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