From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001
From: Srikant Patnaik
Date: Sun, 11 Jan 2015 12:28:04 +0530
Subject: Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
---
 arch/x86/kernel/head64.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 arch/x86/kernel/head64.c

(limited to 'arch/x86/kernel/head64.c')

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
new file mode 100644
index 00000000..3a3b779f
--- /dev/null
+++ b/arch/x86/kernel/head64.c
@@ -0,0 +1,124 @@
+/*
+ *  prepare to run common code
+ *
+ *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/percpu.h>
+#include <linux/start_kernel.h>
+#include <linux/io.h>
+#include <linux/memblock.h>
+
+#include <asm/processor.h>
+#include <asm/proto.h>
+#include <asm/smp.h>
+#include <asm/setup.h>
+#include <asm/desc.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/sections.h>
+#include <asm/kdebug.h>
+#include <asm/e820.h>
+#include <asm/trampoline.h>
+#include <asm/bios_ebda.h>
+
+static void __init zap_identity_mappings(void)
+{
+	pgd_t *pgd = pgd_offset_k(0UL);
+	pgd_clear(pgd);
+	__flush_tlb_all();
+}
+
+/* Don't add a printk in there. printk relies on the PDA which is not initialized 
+   yet. */
+static void __init clear_bss(void)
+{
+	memset(__bss_start, 0,
+	       (unsigned long) __bss_stop - (unsigned long) __bss_start);
+}
+
+static void __init copy_bootdata(char *real_mode_data)
+{
+	char * command_line;
+
+	memcpy(&boot_params, real_mode_data, sizeof boot_params);
+	if (boot_params.hdr.cmd_line_ptr) {
+		command_line = __va(boot_params.hdr.cmd_line_ptr);
+		memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+	}
+}
+
+void __init x86_64_start_kernel(char * real_mode_data)
+{
+	int i;
+
+	/*
+	 * Build-time sanity checks on the kernel image and module
+	 * area mappings. (these are purely build-time and produce no code)
+	 */
+	BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
+	BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
+	BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
+	BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
+	BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
+	BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
+	BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
+				(__START_KERNEL & PGDIR_MASK)));
+	BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
+
+	/* clear bss before set_intr_gate with early_idt_handler */
+	clear_bss();
+
+	/* Make NULL pointers segfault */
+	zap_identity_mappings();
+
+	max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
+
+	for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
+#ifdef CONFIG_EARLY_PRINTK
+		set_intr_gate(i, &early_idt_handlers[i]);
+#else
+		set_intr_gate(i, early_idt_handler);
+#endif
+	}
+	load_idt((const struct desc_ptr *)&idt_descr);
+
+	if (console_loglevel == 10)
+		early_printk("Kernel alive\n");
+
+	x86_64_start_reservations(real_mode_data);
+}
+
+void __init x86_64_start_reservations(char *real_mode_data)
+{
+	copy_bootdata(__va(real_mode_data));
+
+	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 */
+		unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
+		unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
+		unsigned long ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
+		memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
+	}
+#endif
+
+	reserve_ebda_region();
+
+	/*
+	 * 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();
+}
-- 
cgit