#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
}
}
+#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;
+ /*
+ * 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)));
+
/* clear bss before set_intr_gate with early_idt_handler */
clear_bss();
/* Make NULL pointers segfault */
zap_identity_mappings();
- for (i = 0; i < IDT_ENTRIES; i++)
+ /* Cleanup the over mapped high alias */
+ cleanup_highmap();
+
+ 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");
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();
}