This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / kernel / crash_dump.c

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
new file mode 100644 (file)
index 0000000..764d073
--- /dev/null
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -0,0 +1,111 @@
+/*
+ * Routines for doing kexec-based kdump.
+ *
+ * Copyright (C) 2005, IBM Corp.
+ *
+ * Created by: Michael Ellerman
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#undef DEBUG
+
+#include <linux/crash_dump.h>
+#include <linux/bootmem.h>
+#include <asm/kdump.h>
+#include <asm/lmb.h>
+#include <asm/firmware.h>
+#include <asm/uaccess.h>
+
+#ifdef DEBUG
+#include <asm/udbg.h>
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+static void __init create_trampoline(unsigned long addr)
+{
+       /* The maximum range of a single instruction branch, is the current
+        * instruction's address + (32 MB - 4) bytes. For the trampoline we
+        * need to branch to current address + 32 MB. So we insert a nop at
+        * the trampoline address, then the next instruction (+ 4 bytes)
+        * does a branch to (32 MB - 4). The net effect is that when we
+        * branch to "addr" we jump to ("addr" + 32 MB). Although it requires
+        * two instructions it doesn't require any registers.
+        */
+       create_instruction(addr, 0x60000000); /* nop */
+       create_branch(addr + 4, addr + PHYSICAL_START, 0);
+}
+
+void __init kdump_setup(void)
+{
+       unsigned long i;
+
+       DBG(" -> kdump_setup()\n");
+
+       for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
+               create_trampoline(i);
+       }
+
+       create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
+       create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
+
+       DBG(" <- kdump_setup()\n");
+}
+
+#ifdef CONFIG_PROC_VMCORE
+static int __init parse_elfcorehdr(char *p)
+{
+       if (p)
+               elfcorehdr_addr = memparse(p, &p);
+
+       return 1;
+}
+__setup("elfcorehdr=", parse_elfcorehdr);
+#endif
+
+static int __init parse_savemaxmem(char *p)
+{
+       if (p)
+               saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
+
+       return 1;
+}
+__setup("savemaxmem=", parse_savemaxmem);
+
+/*
+ * copy_oldmem_page - copy one page from "oldmem"
+ * @pfn: page frame number to be copied
+ * @buf: target memory address for the copy; this can be in kernel address
+ *      space or user address space (see @userbuf)
+ * @csize: number of bytes to copy
+ * @offset: offset in bytes into the page (based on pfn) to begin the copy
+ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
+ *      otherwise @buf is in kernel address space, use memcpy().
+ *
+ * Copy a page from "oldmem". For this page, there is no pte mapped
+ * in the current kernel. We stitch up a pte, similar to kmap_atomic.
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+                       size_t csize, unsigned long offset, int userbuf)
+{
+       void  *vaddr;
+
+       if (!csize)
+               return 0;
+
+       vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0);
+
+       if (userbuf) {
+               if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) {
+                       iounmap(vaddr);
+                       return -EFAULT;
+               }
+       } else
+               memcpy(buf, (vaddr + offset), csize);
+
+       iounmap(vaddr);
+       return csize;
+}