/*
* machine_kexec.c - handle transition of Linux booting another kernel
- * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
+ * 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 <asm/io.h>
#include <asm/apic.h>
#include <asm/cpufeature.h>
-
-static inline unsigned long read_cr3(void)
-{
- unsigned long cr3;
- asm volatile("movl %%cr3,%0": "=r"(cr3));
- return cr3;
-}
+#include <asm/desc.h>
+#include <asm/system.h>
#define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE)))
/* Identity map the page table entry */
pgtable_level1[level1_index] = address | L0_ATTR;
pgtable_level2[level2_index] = __pa(pgtable_level1) | L1_ATTR;
- set_64bit(&pgtable_level3[level3_index], __pa(pgtable_level2) | L2_ATTR);
+ set_64bit(&pgtable_level3[level3_index],
+ __pa(pgtable_level2) | L2_ATTR);
/* Flush the tlb so the new mapping takes effect.
* Global tlb entries are not flushed but that is not an issue.
}
#endif
-
static void set_idt(void *newidt, __u16 limit)
{
- unsigned char curidt[6];
+ struct Xgt_desc_struct curidt;
/* ia32 supports unaliged loads & stores */
- (*(__u16 *)(curidt)) = limit;
- (*(__u32 *)(curidt +2)) = (unsigned long)(newidt);
+ curidt.size = limit;
+ curidt.address = (unsigned long)newidt;
- __asm__ __volatile__ (
- "lidt %0\n"
- : "=m" (curidt)
- );
+ load_idt(&curidt);
};
static void set_gdt(void *newgdt, __u16 limit)
{
- unsigned char curgdt[6];
+ struct Xgt_desc_struct curgdt;
/* ia32 supports unaligned loads & stores */
- (*(__u16 *)(curgdt)) = limit;
- (*(__u32 *)(curgdt +2)) = (unsigned long)(newgdt);
+ curgdt.size = limit;
+ curgdt.address = (unsigned long)newgdt;
- __asm__ __volatile__ (
- "lgdt %0\n"
- : "=m" (curgdt)
- );
+ load_gdt(&curgdt);
};
static void load_segments(void)
__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"
- );
+ "\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
}
-typedef asmlinkage void (*relocate_new_kernel_t)(
- unsigned long indirection_page, unsigned long reboot_code_buffer,
- unsigned long start_address, unsigned int has_pae);
+typedef asmlinkage NORET_TYPE void (*relocate_new_kernel_t)(
+ unsigned long indirection_page,
+ unsigned long reboot_code_buffer,
+ unsigned long start_address,
+ unsigned int has_pae) ATTRIB_NORET;
const extern unsigned char relocate_new_kernel[];
extern void relocate_new_kernel_end(void);
const extern unsigned int relocate_new_kernel_size;
/*
+ * 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.
+ * 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.
*/
-void machine_kexec(struct kimage *image)
+NORET_TYPE void machine_kexec(struct kimage *image)
{
- unsigned long indirection_page;
+ unsigned long page_list;
unsigned long reboot_code_buffer;
+
relocate_new_kernel_t rnk;
/* Interrupts aren't acceptable while we reboot */
local_irq_disable();
/* Compute some offsets */
- reboot_code_buffer = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
- indirection_page = image->head & PAGE_MASK;
+ reboot_code_buffer = page_to_pfn(image->control_code_page)
+ << PAGE_SHIFT;
+ page_list = image->head;
/* Set up an identity mapping for the reboot_code_buffer */
identity_map_page(reboot_code_buffer);
/* copy it out */
- memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size);
+ memcpy((void *)reboot_code_buffer, relocate_new_kernel,
+ relocate_new_kernel_size);
/* The segment registers are funny things, they are
* automatically loaded from a table, in memory wherever you
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
- (*rnk)(indirection_page, reboot_code_buffer, image->start, cpu_has_pae);
+ (*rnk)(page_list, reboot_code_buffer, image->start, cpu_has_pae);
}
git://git.onelab.eu / linux-2.6.git / blobdiff