2 files changed, 28 insertions, 13 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index c9614f1..02e66d8 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -380,21 +380,17 @@ void  flush_cache(unsigned long dummy1, unsigned long dummy2)
 	asm("wbinvd\n");
 }
 
-void __attribute__ ((regparm(0))) generate_gpf(void);
-
-/* segment 0x70 is an arbitrary segment which does not exist */
-asm(".globl generate_gpf\n"
-	".hidden generate_gpf\n"
-	".type generate_gpf, @function\n"
-	"generate_gpf:\n"
-	"ljmp   $0x70, $0x47114711\n");
-
 __weak void reset_cpu(ulong addr)
 {
-	printf("Resetting using x86 Triple Fault\n");
-	set_vector(13, generate_gpf);	/* general protection fault handler */
-	set_vector(8, generate_gpf);	/* double fault handler */
-	generate_gpf();			/* start the show */
+	/* Do a hard reset through the chipset's reset control register */
+	outb(SYS_RST | RST_CPU, PORT_RESET);
+	for (;;)
+		cpu_hlt();
+}
+
+void x86_full_reset(void)
+{
+	outb(FULL_RST | SYS_RST | RST_CPU, PORT_RESET);
 }
 
 int dcache_status(void)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 3e26202..3575d34 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -25,8 +25,27 @@
 
 #ifndef __ASSEMBLY__
 
+/*
+ * This register is documented in (for example) the Intel Atom Processor E3800
+ * Product Family Datasheet in "PCU - Power Management Controller (PMC)".
+ *
+ * RST_CNT: Reset Control Register (RST_CNT) Offset cf9.
+ *
+ * The naming follows Intel's naming.
+ */
 #define PORT_RESET		0xcf9
 
+enum {
+	SYS_RST		= 1 << 1,	/* 0 for soft reset, 1 for hard reset */
+	RST_CPU		= 1 << 2,	/* initiate reset */
+	FULL_RST	= 1 << 3,	/* full power cycle */
+};
+
+/**
+ * x86_full_reset() - reset everything: perform a full power cycle
+ */
+void x86_full_reset(void);
+
 static inline __attribute__((always_inline)) void cpu_hlt(void)
 {
 	asm("hlt");