2005-04-17 06:20:36 +08:00
|
|
|
/*
|
2007-10-13 09:10:53 +08:00
|
|
|
* prepare to run common code
|
2005-04-17 06:20:36 +08:00
|
|
|
*
|
|
|
|
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/string.h>
|
|
|
|
#include <linux/percpu.h>
|
2008-01-30 20:30:19 +08:00
|
|
|
#include <linux/start_kernel.h>
|
2008-03-28 10:49:44 +08:00
|
|
|
#include <linux/io.h>
|
2010-08-26 04:39:17 +08:00
|
|
|
#include <linux/memblock.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
#include <asm/processor.h>
|
|
|
|
#include <asm/proto.h>
|
|
|
|
#include <asm/smp.h>
|
|
|
|
#include <asm/setup.h>
|
|
|
|
#include <asm/desc.h>
|
2005-11-06 00:25:53 +08:00
|
|
|
#include <asm/pgtable.h>
|
2007-05-03 01:27:07 +08:00
|
|
|
#include <asm/tlbflush.h>
|
2005-11-06 00:25:53 +08:00
|
|
|
#include <asm/sections.h>
|
2008-01-30 20:30:17 +08:00
|
|
|
#include <asm/kdebug.h>
|
2008-01-30 20:33:17 +08:00
|
|
|
#include <asm/e820.h>
|
2009-08-29 21:03:59 +08:00
|
|
|
#include <asm/bios_ebda.h>
|
2013-01-29 17:05:24 +08:00
|
|
|
#include <asm/bootparam_utils.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-05-03 01:27:07 +08:00
|
|
|
static void __init zap_identity_mappings(void)
|
|
|
|
{
|
|
|
|
pgd_t *pgd = pgd_offset_k(0UL);
|
|
|
|
pgd_clear(pgd);
|
2008-01-30 20:33:54 +08:00
|
|
|
__flush_tlb_all();
|
2007-05-03 01:27:07 +08:00
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Don't add a printk in there. printk relies on the PDA which is not initialized
|
|
|
|
yet. */
|
|
|
|
static void __init clear_bss(void)
|
|
|
|
{
|
|
|
|
memset(__bss_start, 0,
|
2005-11-06 00:25:53 +08:00
|
|
|
(unsigned long) __bss_stop - (unsigned long) __bss_start);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __init copy_bootdata(char *real_mode_data)
|
|
|
|
{
|
|
|
|
char * command_line;
|
|
|
|
|
2007-10-16 08:13:22 +08:00
|
|
|
memcpy(&boot_params, real_mode_data, sizeof boot_params);
|
2013-01-29 17:05:24 +08:00
|
|
|
sanitize_boot_params(&boot_params);
|
2007-10-16 08:13:22 +08:00
|
|
|
if (boot_params.hdr.cmd_line_ptr) {
|
|
|
|
command_line = __va(boot_params.hdr.cmd_line_ptr);
|
|
|
|
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init x86_64_start_kernel(char * real_mode_data)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2008-02-21 20:45:16 +08:00
|
|
|
/*
|
|
|
|
* 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)));
|
2008-07-31 23:48:31 +08:00
|
|
|
BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
|
2008-02-21 20:45:16 +08:00
|
|
|
|
2006-12-07 09:14:12 +08:00
|
|
|
/* clear bss before set_intr_gate with early_idt_handler */
|
|
|
|
clear_bss();
|
|
|
|
|
2007-05-03 01:27:07 +08:00
|
|
|
/* Make NULL pointers segfault */
|
|
|
|
zap_identity_mappings();
|
|
|
|
|
2010-10-14 07:34:15 +08:00
|
|
|
max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
|
|
|
|
|
2008-03-11 09:23:20 +08:00
|
|
|
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
|
2008-01-30 20:33:06 +08:00
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
2008-01-30 20:33:06 +08:00
|
|
|
set_intr_gate(i, &early_idt_handlers[i]);
|
2008-01-30 20:33:06 +08:00
|
|
|
#else
|
|
|
|
set_intr_gate(i, early_idt_handler);
|
|
|
|
#endif
|
|
|
|
}
|
2007-10-20 02:35:03 +08:00
|
|
|
load_idt((const struct desc_ptr *)&idt_descr);
|
2005-11-06 00:25:53 +08:00
|
|
|
|
2008-09-29 00:49:46 +08:00
|
|
|
if (console_loglevel == 10)
|
|
|
|
early_printk("Kernel alive\n");
|
2006-07-03 15:24:57 +08:00
|
|
|
|
2008-06-25 12:19:18 +08:00
|
|
|
x86_64_start_reservations(real_mode_data);
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init x86_64_start_reservations(char *real_mode_data)
|
|
|
|
{
|
2007-05-03 01:27:07 +08:00
|
|
|
copy_bootdata(__va(real_mode_data));
|
2008-01-30 20:30:46 +08:00
|
|
|
|
2011-07-12 17:16:06 +08:00
|
|
|
memblock_reserve(__pa_symbol(&_text),
|
|
|
|
__pa_symbol(&__bss_stop) - __pa_symbol(&_text));
|
2008-01-30 20:33:17 +08:00
|
|
|
|
2008-03-19 03:51:22 +08:00
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
2008-01-30 20:33:17 +08:00
|
|
|
/* Reserve INITRD */
|
|
|
|
if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
|
x86: Make sure free_init_pages() frees pages on page boundary
When CONFIG_NO_BOOTMEM=y, it could use memory more effiently, or
in a more compact fashion.
Example:
Allocated new RAMDISK: 00ec2000 - 0248ce57
Move RAMDISK from 000000002ea04000 - 000000002ffcee56 to 00ec2000 - 0248ce56
The new RAMDISK's end is not page aligned.
Last page could be shared with other users.
When free_init_pages are called for initrd or .init, the page
could be freed and we could corrupt other data.
code segment in free_init_pages():
| for (; addr < end; addr += PAGE_SIZE) {
| ClearPageReserved(virt_to_page(addr));
| init_page_count(virt_to_page(addr));
| memset((void *)(addr & ~(PAGE_SIZE-1)),
| POISON_FREE_INITMEM, PAGE_SIZE);
| free_page(addr);
| totalram_pages++;
| }
last half page could be used as one whole free page.
So page align the boundaries.
-v2: make the original initramdisk to be aligned, according to
Johannes, otherwise we have the chance to lose one page.
we still need to keep initrd_end not aligned, otherwise it could
confuse decompressor.
-v3: change to WARN_ON instead, suggested by Johannes.
-v4: use PAGE_ALIGN, suggested by Johannes.
We may fix that macro name later to PAGE_ALIGN_UP, and PAGE_ALIGN_DOWN
Add comments about assuming ramdisk start is aligned
in relocate_initrd(), change to re get ramdisk_image instead of save it
to make diff smaller. Add warning for wrong range, suggested by Johannes.
-v6: remove one WARN()
We need to align beginning in free_init_pages()
do not copy more than ramdisk_size, noticed by Johannes
Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
Tested-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1269830604-26214-3-git-send-email-yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-03-29 10:42:55 +08:00
|
|
|
/* Assume only end is not page aligned */
|
2008-01-30 20:33:17 +08:00
|
|
|
unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
|
|
|
|
unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
|
x86: Make sure free_init_pages() frees pages on page boundary
When CONFIG_NO_BOOTMEM=y, it could use memory more effiently, or
in a more compact fashion.
Example:
Allocated new RAMDISK: 00ec2000 - 0248ce57
Move RAMDISK from 000000002ea04000 - 000000002ffcee56 to 00ec2000 - 0248ce56
The new RAMDISK's end is not page aligned.
Last page could be shared with other users.
When free_init_pages are called for initrd or .init, the page
could be freed and we could corrupt other data.
code segment in free_init_pages():
| for (; addr < end; addr += PAGE_SIZE) {
| ClearPageReserved(virt_to_page(addr));
| init_page_count(virt_to_page(addr));
| memset((void *)(addr & ~(PAGE_SIZE-1)),
| POISON_FREE_INITMEM, PAGE_SIZE);
| free_page(addr);
| totalram_pages++;
| }
last half page could be used as one whole free page.
So page align the boundaries.
-v2: make the original initramdisk to be aligned, according to
Johannes, otherwise we have the chance to lose one page.
we still need to keep initrd_end not aligned, otherwise it could
confuse decompressor.
-v3: change to WARN_ON instead, suggested by Johannes.
-v4: use PAGE_ALIGN, suggested by Johannes.
We may fix that macro name later to PAGE_ALIGN_UP, and PAGE_ALIGN_DOWN
Add comments about assuming ramdisk start is aligned
in relocate_initrd(), change to re get ramdisk_image instead of save it
to make diff smaller. Add warning for wrong range, suggested by Johannes.
-v6: remove one WARN()
We need to align beginning in free_init_pages()
do not copy more than ramdisk_size, noticed by Johannes
Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
Tested-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1269830604-26214-3-git-send-email-yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-03-29 10:42:55 +08:00
|
|
|
unsigned long ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
|
2011-07-12 17:16:06 +08:00
|
|
|
memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
|
2008-01-30 20:33:17 +08:00
|
|
|
}
|
2008-03-19 03:51:22 +08:00
|
|
|
#endif
|
2008-01-30 20:33:17 +08:00
|
|
|
|
2009-08-29 21:03:59 +08:00
|
|
|
reserve_ebda_region();
|
2008-01-30 20:33:17 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
start_kernel();
|
|
|
|
}
|