arch/powerpc/kexec/core.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kexec/core.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kexec/core.c
Extension
.c
Size
5914 bytes
Lines
228
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Code to handle transition of Linux booting another kernel.
 *
 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
 * Copyright (C) 2005 IBM Corporation.
 */

#include <linux/kexec.h>
#include <linux/reboot.h>
#include <linux/threads.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/ftrace.h>

#include <asm/kdump.h>
#include <asm/machdep.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/firmware.h>

#define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
#define __be_word __PASTE(__be, BITS_PER_LONG)

#ifdef CONFIG_CRASH_DUMP
void machine_crash_shutdown(struct pt_regs *regs)
{
	default_machine_crash_shutdown(regs);
}
#endif

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)
{
	int save_ftrace_enabled;

	save_ftrace_enabled = __ftrace_enabled_save();
	this_cpu_disable_ftrace();

	if (ppc_md.machine_kexec)
		ppc_md.machine_kexec(image);
	else
		default_machine_kexec(image);

	this_cpu_enable_ftrace();
	__ftrace_enabled_restore(save_ftrace_enabled);

	/* Fall back to normal restart if we're still alive. */
	machine_restart(NULL);
	for(;;);
}

#ifdef CONFIG_CRASH_RESERVE

static unsigned long long crashk_cma_size;

static unsigned long long __init get_crash_base(unsigned long long crash_base)
{

#ifndef CONFIG_NONSTATIC_KERNEL
	if (crash_base != KDUMP_KERNELBASE)
		printk("Crash kernel location must be 0x%x\n",
				KDUMP_KERNELBASE);

	return KDUMP_KERNELBASE;
#else
	unsigned long long crash_base_align;

	if (!crash_base) {
#ifdef CONFIG_PPC64
		/*
		 * On the LPAR platform place the crash kernel to mid of
		 * RMA size (max. of 512MB) to ensure the crash kernel
		 * gets enough space to place itself and some stack to be
		 * in the first segment. At the same time normal kernel
		 * also get enough space to allocate memory for essential
		 * system resource in the first segment. Keep the crash
		 * kernel starts at 128MB offset on other platforms.
		 */
		if (firmware_has_feature(FW_FEATURE_LPAR))

Annotation

Implementation Notes