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Diffstat (limited to 'arch/x86/kernel/head64.c')
-rw-r--r--arch/x86/kernel/head64.c63
1 files changed, 58 insertions, 5 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 6b3469311e4..24dbf56928d 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/percpu.h>
+#include <linux/start_kernel.h>
#include <asm/processor.h>
#include <asm/proto.h>
@@ -19,12 +20,14 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>
+#include <asm/kdebug.h>
+#include <asm/e820.h>
static void __init zap_identity_mappings(void)
{
pgd_t *pgd = pgd_offset_k(0UL);
pgd_clear(pgd);
- __flush_tlb();
+ __flush_tlb_all();
}
/* Don't add a printk in there. printk relies on the PDA which is not initialized
@@ -46,6 +49,35 @@ static void __init copy_bootdata(char *real_mode_data)
}
}
+#define EBDA_ADDR_POINTER 0x40E
+
+static __init void reserve_ebda(void)
+{
+ unsigned ebda_addr, ebda_size;
+
+ /*
+ * there is a real-mode segmented pointer pointing to the
+ * 4K EBDA area at 0x40E
+ */
+ ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
+ ebda_addr <<= 4;
+
+ if (!ebda_addr)
+ return;
+
+ ebda_size = *(unsigned short *)__va(ebda_addr);
+
+ /* Round EBDA up to pages */
+ if (ebda_size == 0)
+ ebda_size = 1;
+ ebda_size <<= 10;
+ ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
+ if (ebda_size > 64*1024)
+ ebda_size = 64*1024;
+
+ reserve_early(ebda_addr, ebda_addr + ebda_size, "EBDA");
+}
+
void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
@@ -56,8 +88,13 @@ void __init x86_64_start_kernel(char * real_mode_data)
/* Make NULL pointers segfault */
zap_identity_mappings();
- for (i = 0; i < IDT_ENTRIES; i++)
+ for (i = 0; i < IDT_ENTRIES; 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);
early_printk("Kernel alive\n");
@@ -67,8 +104,24 @@ void __init x86_64_start_kernel(char * real_mode_data)
pda_init(0);
copy_bootdata(__va(real_mode_data));
-#ifdef CONFIG_SMP
- cpu_set(0, cpu_online_map);
-#endif
+
+ reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
+
+ /* Reserve INITRD */
+ if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
+ unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
+ unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
+ unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
+ reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
+ }
+
+ reserve_ebda();
+
+ /*
+ * 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();
}