crashdump backup region handling

o This patch adds support for reserving space for backup region. Also adds code
in purgatory to copy the first 640K to backup region.
o Moved kexec_flags inside kexec_info structure.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>

9 files changed, 73 insertions, 0 deletions

diff --git a/purgatory/arch/i386/Makefile b/purgatory/arch/i386/Makefile
index 8af604c2..97478f41 100644
--- a/purgatory/arch/i386/Makefile
+++ b/purgatory/arch/i386/Makefile
@@ -12,3 +12,4 @@ PURGATORY_C_SRCS+= purgatory/arch/i386/purgatory-x86.c
 PURGATORY_C_SRCS+= purgatory/arch/i386/console-x86.c
 PURGATORY_C_SRCS+= purgatory/arch/i386/vga.c
 PURGATORY_C_SRCS+= purgatory/arch/i386/pic.c
+PURGATORY_C_SRCS+= purgatory/arch/i386/crashdump_backup.c
diff --git a/purgatory/arch/i386/crashdump_backup.c b/purgatory/arch/i386/crashdump_backup.c
new file mode 100644
index 00000000..14e807fe
--- /dev/null
+++ b/purgatory/arch/i386/crashdump_backup.c
@@ -0,0 +1,44 @@
+/*
+ * kexec: Linux boots Linux
+ *
+ * Created by:  Vivek goyal (vgoyal@in.ibm.com)
+ * Copyright (C) IBM Corporation, 2005. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation (version 2 of the License).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#define BACKUP_REGION_SOURCE 0x00000000
+#define BACKUP_REGION_SIZE 0xa0000
+
+/* Backup region start gets set after /proc/iomem has been parsed. */
+uint32_t backup_start = 0;
+
+/* Backup first 640K of memory to backup region as reserved by kexec.
+ * Assuming first 640K has to be present on i386 machines and no address
+ * validity checks have to be performed. */
+
+void crashdump_backup_memory(void)
+{
+	void *dest, *src;
+
+	src = (void *) BACKUP_REGION_SOURCE;
+
+	if (backup_start) {
+		dest = (void *)(backup_start);
+		memcpy(dest, src, BACKUP_REGION_SIZE);
+	}
+}
diff --git a/purgatory/arch/i386/purgatory-x86.c b/purgatory/arch/i386/purgatory-x86.c
index 442358a2..5ad07404 100644
--- a/purgatory/arch/i386/purgatory-x86.c
+++ b/purgatory/arch/i386/purgatory-x86.c
@@ -30,6 +30,7 @@ void x86_setup_cpu(void)
 uint8_t reset_vga = 0;
 uint8_t legacy_timer = 0;
 uint8_t legacy_pic   = 0;
+uint8_t panic_kernel = 0;
 
 void setup_arch(void)
 {
@@ -38,3 +39,9 @@ void setup_arch(void)
 	if (legacy_pic)   x86_setup_legacy_pic();
 	/* if (legacy_timer) x86_setup_legacy_timer(); */
 }
+
+/* This function can be used to execute after the SHA256 verification. */
+void post_verification_setup_arch(void)
+{
+	if (panic_kernel)   crashdump_backup_memory();
+}
diff --git a/purgatory/arch/i386/purgatory-x86.h b/purgatory/arch/i386/purgatory-x86.h
index 4178b379..02039c9f 100644
--- a/purgatory/arch/i386/purgatory-x86.h
+++ b/purgatory/arch/i386/purgatory-x86.h
@@ -4,5 +4,6 @@
 void x86_reset_vga(void);
 void x86_setup_legacy_pic(void);
 void x86_setup_legacy_timer(void);
+void crashdump_backup_memory(void);
 
 #endif /* PURGATORY_X86_H */
diff --git a/purgatory/arch/ia64/purgatory-ia64.c b/purgatory/arch/ia64/purgatory-ia64.c
index c10cbeaf..369e175b 100644
--- a/purgatory/arch/ia64/purgatory-ia64.c
+++ b/purgatory/arch/ia64/purgatory-ia64.c
@@ -5,3 +5,9 @@ void setup_arch(void)
 {
 	/* Nothing for now */
 }
+
+/* This function can be used to execute after the SHA256 verification. */
+void post_verification_setup_arch(void)
+{
+	/* Nothing for now */
+}
diff --git a/purgatory/arch/ppc/purgatory-ppc.c b/purgatory/arch/ppc/purgatory-ppc.c
index ab4d941d..077f495a 100644
--- a/purgatory/arch/ppc/purgatory-ppc.c
+++ b/purgatory/arch/ppc/purgatory-ppc.c
@@ -5,3 +5,9 @@ void setup_arch(void)
 {
 	/* Nothing for now */
 }
+
+/* This function can be used to execute after the SHA256 verification. */
+void post_verification_setup_arch(void)
+{
+	/* Nothing for now */
+}
diff --git a/purgatory/arch/x86_64/purgatory-x86_64.c b/purgatory/arch/x86_64/purgatory-x86_64.c
index f839ab5e..8a2387c3 100644
--- a/purgatory/arch/x86_64/purgatory-x86_64.c
+++ b/purgatory/arch/x86_64/purgatory-x86_64.c
@@ -10,3 +10,9 @@ void setup_arch(void)
 	if (reset_vga)    x86_reset_vga();
 	if (legacy_pic)   x86_setup_legacy_pic();
 }
+
+/* This function can be used to execute after the SHA256 verification. */
+void post_verification_setup_arch(void)
+{
+	/* Nothing for now */
+}
diff --git a/purgatory/include/purgatory.h b/purgatory/include/purgatory.h
index 93037f20..79ed5bfe 100644
--- a/purgatory/include/purgatory.h
+++ b/purgatory/include/purgatory.h
@@ -4,5 +4,6 @@
 void putchar(int ch);
 void printf(const char *fmt, ...);
 void setup_arch(void);
+void post_verification_setup_arch(void);
 
 #endif /* PURGATORY_H */
diff --git a/purgatory/purgatory.c b/purgatory/purgatory.c
index 97fc638d..ad0cac2a 100644
--- a/purgatory/purgatory.c
+++ b/purgatory/purgatory.c
@@ -44,4 +44,5 @@ void purgatory(void)
 	printf("I'm in purgatory\n");
 	setup_arch();
 	verify_sha256_digest();
+	post_verification_setup_arch();
 }