i386: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
171
arch/x86/kernel/machine_kexec_32.c
Normal file
171
arch/x86/kernel/machine_kexec_32.c
Normal file
@@ -0,0 +1,171 @@
|
||||
/*
|
||||
* machine_kexec.c - handle transition of Linux booting another kernel
|
||||
* Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com>
|
||||
*
|
||||
* This source code is licensed under the GNU General Public License,
|
||||
* Version 2. See the file COPYING for more details.
|
||||
*/
|
||||
|
||||
#include <linux/mm.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/init.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/pgalloc.h>
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/cpufeature.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/system.h>
|
||||
|
||||
#define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE)))
|
||||
static u32 kexec_pgd[1024] PAGE_ALIGNED;
|
||||
#ifdef CONFIG_X86_PAE
|
||||
static u32 kexec_pmd0[1024] PAGE_ALIGNED;
|
||||
static u32 kexec_pmd1[1024] PAGE_ALIGNED;
|
||||
#endif
|
||||
static u32 kexec_pte0[1024] PAGE_ALIGNED;
|
||||
static u32 kexec_pte1[1024] PAGE_ALIGNED;
|
||||
|
||||
static void set_idt(void *newidt, __u16 limit)
|
||||
{
|
||||
struct Xgt_desc_struct curidt;
|
||||
|
||||
/* ia32 supports unaliged loads & stores */
|
||||
curidt.size = limit;
|
||||
curidt.address = (unsigned long)newidt;
|
||||
|
||||
load_idt(&curidt);
|
||||
};
|
||||
|
||||
|
||||
static void set_gdt(void *newgdt, __u16 limit)
|
||||
{
|
||||
struct Xgt_desc_struct curgdt;
|
||||
|
||||
/* ia32 supports unaligned loads & stores */
|
||||
curgdt.size = limit;
|
||||
curgdt.address = (unsigned long)newgdt;
|
||||
|
||||
load_gdt(&curgdt);
|
||||
};
|
||||
|
||||
static void load_segments(void)
|
||||
{
|
||||
#define __STR(X) #X
|
||||
#define STR(X) __STR(X)
|
||||
|
||||
__asm__ __volatile__ (
|
||||
"\tljmp $"STR(__KERNEL_CS)",$1f\n"
|
||||
"\t1:\n"
|
||||
"\tmovl $"STR(__KERNEL_DS)",%%eax\n"
|
||||
"\tmovl %%eax,%%ds\n"
|
||||
"\tmovl %%eax,%%es\n"
|
||||
"\tmovl %%eax,%%fs\n"
|
||||
"\tmovl %%eax,%%gs\n"
|
||||
"\tmovl %%eax,%%ss\n"
|
||||
::: "eax", "memory");
|
||||
#undef STR
|
||||
#undef __STR
|
||||
}
|
||||
|
||||
/*
|
||||
* A architecture hook called to validate the
|
||||
* proposed image and prepare the control pages
|
||||
* as needed. The pages for KEXEC_CONTROL_CODE_SIZE
|
||||
* have been allocated, but the segments have yet
|
||||
* been copied into the kernel.
|
||||
*
|
||||
* Do what every setup is needed on image and the
|
||||
* reboot code buffer to allow us to avoid allocations
|
||||
* later.
|
||||
*
|
||||
* Currently nothing.
|
||||
*/
|
||||
int machine_kexec_prepare(struct kimage *image)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Undo anything leftover by machine_kexec_prepare
|
||||
* when an image is freed.
|
||||
*/
|
||||
void machine_kexec_cleanup(struct kimage *image)
|
||||
{
|
||||
}
|
||||
|
||||
/*
|
||||
* Do not allocate memory (or fail in any way) in machine_kexec().
|
||||
* We are past the point of no return, committed to rebooting now.
|
||||
*/
|
||||
NORET_TYPE void machine_kexec(struct kimage *image)
|
||||
{
|
||||
unsigned long page_list[PAGES_NR];
|
||||
void *control_page;
|
||||
|
||||
/* Interrupts aren't acceptable while we reboot */
|
||||
local_irq_disable();
|
||||
|
||||
control_page = page_address(image->control_code_page);
|
||||
memcpy(control_page, relocate_kernel, PAGE_SIZE);
|
||||
|
||||
page_list[PA_CONTROL_PAGE] = __pa(control_page);
|
||||
page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel;
|
||||
page_list[PA_PGD] = __pa(kexec_pgd);
|
||||
page_list[VA_PGD] = (unsigned long)kexec_pgd;
|
||||
#ifdef CONFIG_X86_PAE
|
||||
page_list[PA_PMD_0] = __pa(kexec_pmd0);
|
||||
page_list[VA_PMD_0] = (unsigned long)kexec_pmd0;
|
||||
page_list[PA_PMD_1] = __pa(kexec_pmd1);
|
||||
page_list[VA_PMD_1] = (unsigned long)kexec_pmd1;
|
||||
#endif
|
||||
page_list[PA_PTE_0] = __pa(kexec_pte0);
|
||||
page_list[VA_PTE_0] = (unsigned long)kexec_pte0;
|
||||
page_list[PA_PTE_1] = __pa(kexec_pte1);
|
||||
page_list[VA_PTE_1] = (unsigned long)kexec_pte1;
|
||||
|
||||
/* The segment registers are funny things, they have both a
|
||||
* visible and an invisible part. Whenever the visible part is
|
||||
* set to a specific selector, the invisible part is loaded
|
||||
* with from a table in memory. At no other time is the
|
||||
* descriptor table in memory accessed.
|
||||
*
|
||||
* I take advantage of this here by force loading the
|
||||
* segments, before I zap the gdt with an invalid value.
|
||||
*/
|
||||
load_segments();
|
||||
/* The gdt & idt are now invalid.
|
||||
* If you want to load them you must set up your own idt & gdt.
|
||||
*/
|
||||
set_gdt(phys_to_virt(0),0);
|
||||
set_idt(phys_to_virt(0),0);
|
||||
|
||||
/* now call it */
|
||||
relocate_kernel((unsigned long)image->head, (unsigned long)page_list,
|
||||
image->start, cpu_has_pae);
|
||||
}
|
||||
|
||||
/* crashkernel=size@addr specifies the location to reserve for
|
||||
* a crash kernel. By reserving this memory we guarantee
|
||||
* that linux never sets it up as a DMA target.
|
||||
* Useful for holding code to do something appropriate
|
||||
* after a kernel panic.
|
||||
*/
|
||||
static int __init parse_crashkernel(char *arg)
|
||||
{
|
||||
unsigned long size, base;
|
||||
size = memparse(arg, &arg);
|
||||
if (*arg == '@') {
|
||||
base = memparse(arg+1, &arg);
|
||||
/* FIXME: Do I want a sanity check
|
||||
* to validate the memory range?
|
||||
*/
|
||||
crashk_res.start = base;
|
||||
crashk_res.end = base + size - 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
early_param("crashkernel", parse_crashkernel);
|
||||
Reference in New Issue
Block a user