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authorManish Ahuja <ahuja@austin.ibm.com>2008-03-22 10:37:08 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-26 08:44:06 +1100
commit6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb (patch)
tree4eb613ed5f8eb7accb042e30c89d9d25097d557f /include
parentd28a79326a4028dbb1755b8efe6daa915d8bfeea (diff)
downloadop-kernel-dev-6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb.zip
op-kernel-dev-6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb.tar.gz
[POWERPC] pseries: phyp dump: Reserve and release memory
Initial patch for reserving memory in early boot, and freeing it later. If the previous boot had ended with a crash, the reserved memory would contain a copy of the crashed kernel data. Signed-off-by: Manish Ahuja <mahuja@us.ibm.com> Signed-off-by: Linas Vepstas <linasvepstas@gmail.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-powerpc/phyp_dump.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/asm-powerpc/phyp_dump.h b/include/asm-powerpc/phyp_dump.h
new file mode 100644
index 0000000..e2d988d
--- /dev/null
+++ b/include/asm-powerpc/phyp_dump.h
@@ -0,0 +1,41 @@
+/*
+ * Hypervisor-assisted dump
+ *
+ * Linas Vepstas, Manish Ahuja 2008
+ * Copyright 2008 IBM Corp.
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _PPC64_PHYP_DUMP_H
+#define _PPC64_PHYP_DUMP_H
+
+#ifdef CONFIG_PHYP_DUMP
+
+/* The RMR region will be saved for later dumping
+ * whenever the kernel crashes. Set this to 256MB. */
+#define PHYP_DUMP_RMR_START 0x0
+#define PHYP_DUMP_RMR_END (1UL<<28)
+
+struct phyp_dump {
+ /* Memory that is reserved during very early boot. */
+ unsigned long init_reserve_start;
+ unsigned long init_reserve_size;
+ /* Check status during boot if dump supported, active & present*/
+ unsigned long phyp_dump_configured;
+ unsigned long phyp_dump_is_active;
+ /* store cpu & hpte size */
+ unsigned long cpu_state_size;
+ unsigned long hpte_region_size;
+};
+
+extern struct phyp_dump *phyp_dump_info;
+
+int early_init_dt_scan_phyp_dump(unsigned long node,
+ const char *uname, int depth, void *data);
+
+#endif /* CONFIG_PHYP_DUMP */
+#endif /* _PPC64_PHYP_DUMP_H */
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