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authorGabe Black <gabeblack@chromium.org>2012-11-03 11:41:28 +0000
committerSimon Glass <sjg@chromium.org>2012-12-06 14:30:42 -0800
commit91d82a29e7aec12c97dcd4a4be1962f6d794b35c (patch)
treee70b0d46290d7e1554bc59253cb55e8d091e1ecb
parent112a575e498fe0c6bfbb4dbe3266d83f48d46a99 (diff)
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x86: Add back cold- and warm-boot flags
These were removed, but actually are useful. Cold means that we started from a reset/power on. Warm means that we started from another U-Boot. We determine whether u-boot on x86 was warm or cold booted (really if it started at the beginning of the text segment or at the ELF entry point). We plumb the result through to the global data structure. Signed-off-by: Simon Glass <sjg@chromium.org>
-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 */