diff options
Diffstat (limited to 'arch/x86/kernel/head64.c')
| -rw-r--r-- | arch/x86/kernel/head64.c | 63 |
1 files changed, 58 insertions, 5 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 6b3469311e42..a317336cdeaa 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); +} + 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)); + + /* 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); + } + + 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(); } |