init android origin source code

1 files changed, 68 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/arch/x86/kernel/head32.c b/ANDROID_3.4.5/arch/x86/kernel/head32.c
new file mode 100644
index 00000000..51ff1861
--- /dev/null
+++ b/ANDROID_3.4.5/arch/x86/kernel/head32.c
@@ -0,0 +1,68 @@
+/*
+ *  linux/arch/i386/kernel/head32.c -- prepare to run common code
+ *
+ *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ *  Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
+ */
+
+#include <linux/init.h>
+#include <linux/start_kernel.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/e820.h>
+#include <asm/page.h>
+#include <asm/trampoline.h>
+#include <asm/apic.h>
+#include <asm/io_apic.h>
+#include <asm/bios_ebda.h>
+#include <asm/tlbflush.h>
+
+static void __init i386_default_early_setup(void)
+{
+	/* Initialize 32bit specific setup functions */
+	x86_init.resources.reserve_resources = i386_reserve_resources;
+	x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
+
+	reserve_ebda_region();
+}
+
+void __init i386_start_kernel(void)
+{
+	memblock_reserve(__pa_symbol(&_text),
+			 __pa_symbol(&__bss_stop) - __pa_symbol(&_text));
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	/* Reserve INITRD */
+	if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
+		/* Assume only end is not page aligned */
+		u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+		u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
+		u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
+		memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
+	}
+#endif
+
+	/* Call the subarch specific early setup function */
+	switch (boot_params.hdr.hardware_subarch) {
+	case X86_SUBARCH_MRST:
+		x86_mrst_early_setup();
+		break;
+	case X86_SUBARCH_CE4100:
+		x86_ce4100_early_setup();
+		break;
+	default:
+		i386_default_early_setup();
+		break;
+	}
+
+	/*
+	 * At this point everything still needed from the boot loader
+	 * or BIOS or kernel text should be early reserved or marked not
+	 * RAM in e820. All other memory is free game.
+	 */
+
+	start_kernel();
+}