sh: Populate initial secondary CPU info from boot_cpu_data.

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

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 371973b..5fb667a 100644 (file)
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -13,8 +13,10 @@
 
 #include <linux/crash_dump.h>
 #include <linux/bootmem.h>
+#include <linux/lmb.h>
+#include <asm/code-patching.h>
 #include <asm/kdump.h>
-#include <asm/lmb.h>
+#include <asm/prom.h>
 #include <asm/firmware.h>
 #include <asm/uaccess.h>
 
@@ -25,13 +27,19 @@
 #define DBG(fmt...)
 #endif
 
-void reserve_kdump_trampoline(void)
+/* Stores the physical address of elf header of crash image. */
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+
+#ifndef CONFIG_RELOCATABLE
+void __init reserve_kdump_trampoline(void)
 {
        lmb_reserve(0, KDUMP_RESERVE_LIMIT);
 }
 
 static void __init create_trampoline(unsigned long addr)
 {
+       unsigned int *p = (unsigned int *)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
@@ -40,8 +48,8 @@ static void __init create_trampoline(unsigned long addr)
         * 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);
+       patch_instruction(p, PPC_INST_NOP);
+       patch_branch(++p, addr + PHYSICAL_START, 0);
 }
 
 void __init setup_kdump_trampoline(void)
@@ -54,13 +62,20 @@ void __init setup_kdump_trampoline(void)
                create_trampoline(i);
        }
 
+#ifdef CONFIG_PPC_PSERIES
        create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
        create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
+#endif /* CONFIG_PPC_PSERIES */
 
        DBG(" <- setup_kdump_trampoline()\n");
 }
+#endif /* CONFIG_RELOCATABLE */
 
-#ifdef CONFIG_PROC_VMCORE
+/*
+ * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
+ * is_kdump_kernel() to determine if we are booting after a panic. Hence
+ * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
+ */
 static int __init parse_elfcorehdr(char *p)
 {
        if (p)
@@ -69,7 +84,6 @@ static int __init parse_elfcorehdr(char *p)
        return 1;
 }
 __setup("elfcorehdr=", parse_elfcorehdr);
-#endif
 
 static int __init parse_savemaxmem(char *p)
 {
@@ -80,7 +94,20 @@ static int __init parse_savemaxmem(char *p)
 }
 __setup("savemaxmem=", parse_savemaxmem);
 
-/*
+
+static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize,
+                               unsigned long offset, int userbuf)
+{
+       if (userbuf) {
+               if (copy_to_user((char __user *)buf, (vaddr + offset), csize))
+                       return -EFAULT;
+       } else
+               memcpy(buf, (vaddr + offset), csize);
+
+       return csize;
+}
+
+/**
  * 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
@@ -101,16 +128,16 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
        if (!csize)
                return 0;
 
-       vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0);
+       csize = min(csize, PAGE_SIZE);
 
-       if (userbuf) {
-               if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) {
-                       iounmap(vaddr);
-                       return -EFAULT;
-               }
-       } else
-               memcpy(buf, (vaddr + offset), csize);
+       if (pfn < max_pfn) {
+               vaddr = __va(pfn << PAGE_SHIFT);
+               csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
+       } else {
+               vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0);
+               csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
+               iounmap(vaddr);
+       }
 
-       iounmap(vaddr);
        return csize;
 }