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https://github.com/edk2-porting/linux-next.git
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fbb82b0365
This provides a machine_ops-based reboot interface loosely cloned from x86, and converts the native sh32 and sh64 cases over to it. Necessary both for tying in SMP support and also enabling platforms like SDK7786 to add support for their microcontroller-based power managers. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*
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* machine_kexec.c - handle transition of Linux booting another kernel
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* LANDISK/sh4 supported by kogiidena
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/numa.h>
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#include <linux/ftrace.h>
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#include <linux/suspend.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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#include <asm/sh_bios.h>
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#include <asm/reboot.h>
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typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address);
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extern const unsigned char relocate_new_kernel[];
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extern const unsigned int relocate_new_kernel_size;
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extern void *vbr_base;
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void native_machine_crash_shutdown(struct pt_regs *regs)
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{
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/* Nothing to do for UP, but definitely broken for SMP.. */
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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static void kexec_info(struct kimage *image)
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{
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int i;
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printk("kexec information\n");
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for (i = 0; i < image->nr_segments; i++) {
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printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
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i,
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(unsigned int)image->segment[i].mem,
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(unsigned int)image->segment[i].mem +
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image->segment[i].memsz,
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(unsigned int)image->segment[i].memsz);
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}
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printk(" start : 0x%08x\n\n", (unsigned int)image->start);
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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void machine_kexec(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer;
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relocate_new_kernel_t rnk;
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unsigned long entry;
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unsigned long *ptr;
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int save_ftrace_enabled;
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/*
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* Nicked from the mips version of machine_kexec():
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* The generic kexec code builds a page list with physical
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* addresses. Use phys_to_virt() to convert them to virtual.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = (unsigned long) phys_to_virt(*ptr);
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}
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#ifdef CONFIG_KEXEC_JUMP
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if (image->preserve_context)
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save_processor_state();
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#endif
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save_ftrace_enabled = __ftrace_enabled_save();
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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page_list = image->head;
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/* we need both effective and real address here */
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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/* copy our kernel relocation code to the control code page */
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memcpy((void *)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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kexec_info(image);
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flush_cache_all();
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sh_bios_vbr_reload();
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/* now call it */
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rnk = (relocate_new_kernel_t) reboot_code_buffer;
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(*rnk)(page_list, reboot_code_buffer,
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(unsigned long)phys_to_virt(image->start));
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#ifdef CONFIG_KEXEC_JUMP
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asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
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if (image->preserve_context)
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restore_processor_state();
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/* Convert page list back to physical addresses, what a mess. */
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for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
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ptr = (*ptr & IND_INDIRECTION) ?
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phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = virt_to_phys(*ptr);
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}
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#endif
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__ftrace_enabled_restore(save_ftrace_enabled);
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}
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void arch_crash_save_vmcoreinfo(void)
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{
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#ifdef CONFIG_NUMA
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VMCOREINFO_SYMBOL(node_data);
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VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
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#endif
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}
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