patch-2.4.20 linux-2.4.20/arch/x86_64/kernel/head64.c
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- 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();
+}
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