x86: Add processor functions to halt and get stack pointer

Add a function to get the stack pointer and another to halt the CPU.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index bb3172ff91a447e5103d066c825495914b788d2d..b2854a978ab1903a38caa313e9ffeb61292530ee 100644 (file)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -30,4 +30,23 @@ enum {
 
 #define X86_GDT_SIZE           (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)
 
+#ifndef __ASSEMBLY__
+
+static inline __attribute__((always_inline)) void cpu_hlt(void)
+{
+       asm("hlt");
+}
+
+static inline ulong cpu_get_sp(void)
+{
+       ulong result;
+
+       asm volatile(
+               "mov %%esp, %%eax"
+               : "=a" (result));
+       return result;
+}
+
+#endif /* __ASSEMBLY__ */
+
 #endif