1 files changed, 57 insertions, 0 deletions
diff --git a/purgatory/arch/i386/purgatory-x86.c b/purgatory/arch/i386/purgatory-x86.c
new file mode 100644
index 0000000..075e518
--- /dev/null
+++ b/purgatory/arch/i386/purgatory-x86.c
@@ -0,0 +1,57 @@
+#include <stdint.h>
+#include <purgatory.h>
+#include "purgatory-x86.h"
+
+/*
+ * CPU
+ * =============================================================================
+ */
+
+void x86_setup_cpu(void)
+{
+#if 0
+	/* This code is only needed for old versions of the kexec kernel patch.
+	 * While it is still a good idea doing this unconditionally breaks
+	 * on older cpus that did not implemented cr4.
+	 * So this code is disabled for now.  If this is revisited 
+	 * I first need to detect cpuid support and then use cpuid 
+	 * to conditionally change newer cpu registers.
+	 */
+	/* clear special bits in %cr4 */
+	asm volatile(
+		"movl	%0, %%eax\n\t"
+		"movl	%%eax, %%cr4\n\t"
+		: /* outputs */
+		: "r" (0)
+		);
+#endif	
+}
+
+uint8_t reset_vga = 0;
+uint8_t legacy_timer = 0;
+uint8_t legacy_pic   = 0;
+uint8_t panic_kernel = 0;
+unsigned long jump_back_entry = 0;
+char *cmdline_end = 0;
+
+void setup_arch(void)
+{
+	x86_setup_cpu();
+	if (reset_vga)    x86_reset_vga();
+	if (legacy_pic)   x86_setup_legacy_pic();
+	/* if (legacy_timer) x86_setup_legacy_timer(); */
+}
+
+static void x86_setup_jump_back_entry(void)
+{
+	if (cmdline_end)
+		sprintf(cmdline_end, " kexec_jump_back_entry=0x%x",
+			jump_back_entry);
+}
+
+/* This function can be used to execute after the SHA256 verification. */
+void post_verification_setup_arch(void)
+{
+	if (panic_kernel)    crashdump_backup_memory();
+	if (jump_back_entry) x86_setup_jump_back_entry();
+}