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-rw-r--r--arch/x86/cpu/start.S10
-rw-r--r--arch/x86/cpu/start16.S3
-rw-r--r--arch/x86/include/asm/global_data.h6
3 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index ec12e80..e960e21 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -55,8 +55,16 @@ _x86boot_start:
movl %eax, %cr0
wbinvd
+ /* Tell 32-bit code it is being entered from an in-RAM copy */
+ movw $GD_FLG_WARM_BOOT, %bx
+ jmp 1f
_start:
- /* This is the 32-bit cold-reset entry point */
+ /*
+ * This is the 32-bit cold-reset entry point. Initialize %bx to 0
+ * in case we're preceeded by some sort of boot stub.
+ */
+ movw $GD_FLG_COLD_BOOT, %bx
+1:
/* Load the segement registes to match the gdt loaded in start16.S */
movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S
index cc393ff..603bf1d 100644
--- a/arch/x86/cpu/start16.S
+++ b/arch/x86/cpu/start16.S
@@ -37,6 +37,9 @@
.code16
.globl start16
start16:
+ /* Set the Cold Boot / Hard Reset flag */
+ movl $GD_FLG_COLD_BOOT, %ebx
+
/*
* First we let the BSP do some early initialization
* this code have to map the flash to its final position
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 35110a3..dc6402b 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -78,6 +78,12 @@ static inline gd_t *get_fs_gd_ptr(void)
#include <asm-generic/global_data_flags.h>
+/*
+ * Our private Global Data Flags
+ */
+#define GD_FLG_COLD_BOOT 0x00100 /* Cold Boot */
+#define GD_FLG_WARM_BOOT 0x00200 /* Warm Boot */
+
#define DECLARE_GLOBAL_DATA_PTR
#endif /* __ASM_GBL_DATA_H */