patch-2.4.20 linux-2.4.20/arch/x86_64/kernel/head64.c

• Lines: 88
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/arch/x86_64/kernel/head64.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/x86_64/kernel/head64.c linux-2.4.20/arch/x86_64/kernel/head64.c
@@ -0,0 +1,87 @@
+/*
+ *  linux/arch/x86_64/kernel/head64.c -- prepare to run common code
+ *
+ *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ *
+ *  $Id: head64.c,v 1.25 2002/07/01 08:01:19 ak Exp $
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/processor.h>
+#include <asm/proto.h>
+
+static void __init clear_bss(void)
+{
+	extern char __bss_start[], __bss_end[];
+	printk("Clearing %ld bytes of bss...", (unsigned long) __bss_end - (unsigned long) __bss_start);
+	memset(__bss_start, 0,
+	       (unsigned long) __bss_end - (unsigned long) __bss_start);
+	printk("ok\n");
+}
+
+extern char x86_boot_params[2048];
+
+#define NEW_CL_POINTER		0x228	/* Relative to real mode data */
+#define OLD_CL_MAGIC_ADDR	0x90020
+#define OLD_CL_MAGIC            0xA33F
+#define OLD_CL_BASE_ADDR        0x90000
+#define OLD_CL_OFFSET           0x90022
+
+extern char saved_command_line[];
+
+static void __init copy_bootdata(char *real_mode_data)
+{
+	int new_data;
+	char * command_line;
+
+	memcpy(x86_boot_params, real_mode_data, 2048); 
+	new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
+	if (!new_data) {
+		if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
+			printk("so old bootloader that it does not support commandline?!\n");
+			return;
+		}
+		new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
+		printk("old bootloader convention, maybe loadlin?\n");
+	}
+	command_line = (char *) ((u64)(new_data));
+	memcpy(saved_command_line, command_line, 2048);
+	printk("Bootdata ok (command line is %s)\n", saved_command_line);	
+}
+
+static void __init setup_boot_cpu_data(void)
+{
+	int dummy, eax;
+
+	/* get vendor info */
+	cpuid(0, &boot_cpu_data.cpuid_level,
+	      (int *)&boot_cpu_data.x86_vendor_id[0],
+	      (int *)&boot_cpu_data.x86_vendor_id[8],
+	      (int *)&boot_cpu_data.x86_vendor_id[4]);
+
+	/* get cpu type */
+	cpuid(1, &eax, &dummy, &dummy, (int *) &boot_cpu_data.x86_capability);
+	boot_cpu_data.x86 = (eax >> 8) & 0xf;
+	boot_cpu_data.x86_model = (eax >> 4) & 0xf;
+	boot_cpu_data.x86_mask = eax & 0xf;
+}
+
+void __init x86_64_start_kernel(char * real_mode_data)
+{
+	char *s; 
+
+	clear_bss(); /* must be the first thing in C and must not depend on .bss to be zero */
+	pda_init(0); 
+	copy_bootdata(real_mode_data);
+	s = strstr(saved_command_line, "earlyprintk="); 
+	if (s != NULL)
+		setup_early_printk(s+12); 
+	early_printk("booting x86_64 kernel... ");
+	setup_boot_cpu_data();
+	start_kernel();
+}