[ms2-kexec] / machine_kexec.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)
{
	return 0;
}

void machine_kexec_cleanup(struct kimage *image)
{
}

void machine_crash_nonpanic_core(void *unused)
{
	struct pt_regs regs;

	crash_setup_regs(&regs, NULL);
	printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
	       smp_processor_id());
	crash_save_cpu(&regs, 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 page_list;
	unsigned long reboot_code_buffer_phys;
	void *reboot_code_buffer;


	page_list = image->head & PAGE_MASK;

	/* 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);

	/* 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);
	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();
#if 0
	outer_flush_all();
	outer_disable();
#endif
	cpu_proc_fin();
#if 0
	outer_inv_all();
#endif
	flush_cache_all();
	cpu_reset(reboot_code_buffer_phys);
}
Commit	Line	Data
4e93cb00 MG	1	/*
	2	* machine_kexec.c - handle transition of Linux booting another kernel
	3	*/
	4
	5	#include <linux/mm.h>
	6	#include <linux/kexec.h>
	7	#include <linux/delay.h>
	8	#include <linux/reboot.h>
	9	#include <linux/io.h>
	10	#include <asm/pgtable.h>
	11	#include <asm/pgalloc.h>
	12	#include <asm/mmu_context.h>
	13	#include <asm/cacheflush.h>
	14	#include <asm/mach-types.h>
	15
	16	extern const unsigned char relocate_new_kernel[];
	17	extern const unsigned int relocate_new_kernel_size;
	18
	19	extern void setup_mm_for_reboot(char mode);
	20
	21	extern unsigned long kexec_start_address;
	22	extern unsigned long kexec_indirection_page;
	23	extern unsigned long kexec_mach_type;
	24	extern unsigned long kexec_boot_atags;
	25
0c549ba1 MG	26	static atomic_t waiting_for_crash_ipi;
0c549ba1 MG	27
4e93cb00 MG	28	/*
	29	* Provide a dummy crash_notes definition while crash dump arrives to arm.
	30	* This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
	31	*/
	32
	33	int machine_kexec_prepare(struct kimage *image)
	34	{
	35	return 0;
	36	}
	37
	38	void machine_kexec_cleanup(struct kimage *image)
	39	{
	40	}
	41
0c549ba1	42	void machine_crash_nonpanic_core(void *unused)
4e93cb00	43	{
0c549ba1 MG	44	struct pt_regs regs;
	45
	46	crash_setup_regs(&regs, NULL);
	47	printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
	48	smp_processor_id());
	49	crash_save_cpu(&regs, smp_processor_id());
	50	flush_cache_all();
	51
	52	atomic_dec(&waiting_for_crash_ipi);
	53	while (1)
	54	cpu_relax();
4e93cb00 MG	55	}
	56
	57	void machine_crash_shutdown(struct pt_regs *regs)
	58	{
0c549ba1 MG	59	unsigned long msecs;
	60
	61	local_irq_disable();
	62
	63	atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
	64	smp_call_function(machine_crash_nonpanic_core, NULL, false);
	65	msecs = 1000; /* Wait at most a second for the other cpus to stop */
	66	while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
	67	mdelay(1);
	68	msecs--;
	69	}
	70	if (atomic_read(&waiting_for_crash_ipi) > 0)
	71	printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
	72
	73	crash_save_cpu(regs, smp_processor_id());
	74
	75	printk(KERN_INFO "Loading crashdump kernel...\n");
4e93cb00 MG	76	}
4e93cb00 MG	77
0c549ba1 MG	78	/*
	79	* Function pointer to optional machine-specific reinitialization
	80	*/
	81	void (*kexec_reinit)(void);
	82
4e93cb00 MG	83	void machine_kexec(struct kimage *image)
	84	{
	85	unsigned long page_list;
	86	unsigned long reboot_code_buffer_phys;
	87	void *reboot_code_buffer;
	88
	89
	90	page_list = image->head & PAGE_MASK;
	91
	92	/* we need both effective and real address here */
	93	reboot_code_buffer_phys =
	94	page_to_pfn(image->control_code_page) << PAGE_SHIFT;
	95	reboot_code_buffer = page_address(image->control_code_page);
	96
	97	/* Prepare parameters for reboot_code_buffer*/
	98	kexec_start_address = image->start;
	99	kexec_indirection_page = page_list;
	100	kexec_mach_type = machine_arch_type;
	101	kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
	102
	103	/* copy our kernel relocation code to the control code page */
	104	memcpy(reboot_code_buffer,
	105	relocate_new_kernel, relocate_new_kernel_size);
	106
	107
	108	flush_icache_range((unsigned long) reboot_code_buffer,
	109	(unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
	110	printk(KERN_INFO "Bye!\n");
	111
0c549ba1 MG	112	if (kexec_reinit)
	113	kexec_reinit();
	114	local_irq_disable();
	115	local_fiq_disable();
4e93cb00	116	setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
0c549ba1 MG	117	flush_cache_all();
	118	#if 0
	119	outer_flush_all();
	120	outer_disable();
	121	#endif
	122	cpu_proc_fin();
	123	#if 0
	124	outer_inv_all();
	125	#endif
	126	flush_cache_all();
4e93cb00 MG	127	cpu_reset(reboot_code_buffer_phys);
4e93cb00 MG	128	}