126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
|
|
* machine_kexec.c - handle transition of Linux booting another kernel
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/io.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
extern const unsigned char relocate_new_kernel[];
|
|
extern const unsigned int relocate_new_kernel_size;
|
|
|
|
extern void setup_mm_for_reboot(char mode);
|
|
|
|
extern unsigned long kexec_start_address;
|
|
extern unsigned long kexec_indirection_page;
|
|
extern unsigned long kexec_mach_type;
|
|
extern unsigned long kexec_boot_atags;
|
|
|
|
static atomic_t waiting_for_crash_ipi;
|
|
|
|
/*
|
|
* Provide a dummy crash_notes definition while crash dump arrives to arm.
|
|
* This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
|
|
*/
|
|
|
|
int machine_kexec_prepare(struct kimage *image)
|
|
{
|
|
unsigned long page_list;
|
|
void *reboot_code_buffer;
|
|
page_list = image->head & PAGE_MASK;
|
|
|
|
reboot_code_buffer = page_address(image->control_code_page);
|
|
|
|
/* Prepare parameters for reboot_code_buffer*/
|
|
kexec_start_address = image->start;
|
|
kexec_indirection_page = page_list;
|
|
kexec_mach_type = machine_arch_type;
|
|
kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
|
|
|
|
/* copy our kernel relocation code to the control code page */
|
|
memcpy(reboot_code_buffer,
|
|
relocate_new_kernel, relocate_new_kernel_size);
|
|
|
|
flush_icache_range((unsigned long) reboot_code_buffer,
|
|
(unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
{
|
|
}
|
|
|
|
void machine_crash_nonpanic_core(void *unused)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
crash_setup_regs(®s, NULL);
|
|
printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
|
|
smp_processor_id());
|
|
crash_save_cpu(®s, smp_processor_id());
|
|
flush_cache_all();
|
|
|
|
atomic_dec(&waiting_for_crash_ipi);
|
|
while (1)
|
|
cpu_relax();
|
|
}
|
|
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
unsigned long msecs;
|
|
|
|
local_irq_disable();
|
|
|
|
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
|
|
smp_call_function(machine_crash_nonpanic_core, NULL, false);
|
|
msecs = 1000; /* Wait at most a second for the other cpus to stop */
|
|
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
|
|
mdelay(1);
|
|
msecs--;
|
|
}
|
|
if (atomic_read(&waiting_for_crash_ipi) > 0)
|
|
printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
|
|
|
|
crash_save_cpu(regs, smp_processor_id());
|
|
|
|
printk(KERN_INFO "Loading crashdump kernel...\n");
|
|
}
|
|
|
|
/*
|
|
* Function pointer to optional machine-specific reinitialization
|
|
*/
|
|
void (*kexec_reinit)(void);
|
|
|
|
void machine_kexec(struct kimage *image)
|
|
{
|
|
unsigned long reboot_code_buffer_phys;
|
|
void *reboot_code_buffer;
|
|
|
|
/* we need both effective and real address here */
|
|
reboot_code_buffer_phys =
|
|
page_to_pfn(image->control_code_page) << PAGE_SHIFT;
|
|
reboot_code_buffer = page_address(image->control_code_page);
|
|
|
|
printk(KERN_INFO "Bye!\n");
|
|
|
|
if (kexec_reinit)
|
|
kexec_reinit();
|
|
local_irq_disable();
|
|
local_fiq_disable();
|
|
setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
|
|
flush_cache_all();
|
|
outer_flush_all();
|
|
outer_disable();
|
|
cpu_proc_fin();
|
|
outer_inv_all();
|
|
flush_cache_all();
|
|
cpu_reset(reboot_code_buffer_phys);
|
|
}
|