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-rw-r--r--arch/i386/kernel/head.S48
1 files changed, 26 insertions, 22 deletions
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index 4477bb10709..0480ca9e9e5 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -77,6 +77,32 @@ ENTRY(startup_32)
subl %edi,%ecx
shrl $2,%ecx
rep ; stosl
+/*
+ * Copy bootup parameters out of the way.
+ * Note: %esi still has the pointer to the real-mode data.
+ * With the kexec as boot loader, parameter segment might be loaded beyond
+ * kernel image and might not even be addressable by early boot page tables.
+ * (kexec on panic case). Hence copy out the parameters before initializing
+ * page tables.
+ */
+ movl $(boot_params - __PAGE_OFFSET),%edi
+ movl $(PARAM_SIZE/4),%ecx
+ cld
+ rep
+ movsl
+ movl boot_params - __PAGE_OFFSET + NEW_CL_POINTER,%esi
+ andl %esi,%esi
+ jnz 2f # New command line protocol
+ cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
+ jne 1f
+ movzwl OLD_CL_OFFSET,%esi
+ addl $(OLD_CL_BASE_ADDR),%esi
+2:
+ movl $(saved_command_line - __PAGE_OFFSET),%edi
+ movl $(COMMAND_LINE_SIZE/4),%ecx
+ rep
+ movsl
+1:
/*
* Initialize page tables. This creates a PDE and a set of page
@@ -214,28 +240,6 @@ ENTRY(startup_32_smp)
*/
call setup_idt
-/*
- * Copy bootup parameters out of the way.
- * Note: %esi still has the pointer to the real-mode data.
- */
- movl $boot_params,%edi
- movl $(PARAM_SIZE/4),%ecx
- cld
- rep
- movsl
- movl boot_params+NEW_CL_POINTER,%esi
- andl %esi,%esi
- jnz 2f # New command line protocol
- cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
- jne 1f
- movzwl OLD_CL_OFFSET,%esi
- addl $(OLD_CL_BASE_ADDR),%esi
-2:
- movl $saved_command_line,%edi
- movl $(COMMAND_LINE_SIZE/4),%ecx
- rep
- movsl
-1:
checkCPUtype:
movl $-1,X86_CPUID # -1 for no CPUID initially