Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

[pandora-kernel.git] / arch / powerpc / kernel / crash_dump.c

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 5337ab7..2f6f5a7 100644 (file)
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -16,6 +16,7 @@
 #include <asm/kdump.h>
 #include <asm/lmb.h>
 #include <asm/firmware.h>
+#include <asm/uaccess.h>
 
 #ifdef DEBUG
 #include <asm/udbg.h>
@@ -24,6 +25,11 @@
 #define DBG(fmt...)
 #endif
 
+void reserve_kdump_trampoline(void)
+{
+       lmb_reserve(0, KDUMP_RESERVE_LIMIT);
+}
+
 static void __init create_trampoline(unsigned long addr)
 {
        /* The maximum range of a single instruction branch, is the current
@@ -38,11 +44,11 @@ static void __init create_trampoline(unsigned long addr)
        create_branch(addr + 4, addr + PHYSICAL_START, 0);
 }
 
-void __init kdump_setup(void)
+void __init setup_kdump_trampoline(void)
 {
        unsigned long i;
 
-       DBG(" -> kdump_setup()\n");
+       DBG(" -> setup_kdump_trampoline()\n");
 
        for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
                create_trampoline(i);
@@ -51,23 +57,60 @@ void __init kdump_setup(void)
        create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
        create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
 
-       DBG(" <- kdump_setup()\n");
+       DBG(" <- setup_kdump_trampoline()\n");
 }
 
+#ifdef CONFIG_PROC_VMCORE
 static int __init parse_elfcorehdr(char *p)
 {
        if (p)
                elfcorehdr_addr = memparse(p, &p);
 
-       return 0;
+       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 0;
+       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;
+}