/* * Code to handle transition of Linux booting another kernel. * * Copyright (C) 2002-2003 Eric Biederman * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz * Copyright (C) 2005 IBM Corporation. * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ #include #include #include #include #include #include #include #include #include #include void machine_kexec_mask_interrupts(void) { unsigned int i; for_each_irq(i) { struct irq_desc *desc = irq_to_desc(i); struct irq_chip *chip; if (!desc) continue; chip = irq_desc_get_chip(desc); if (!chip) continue; if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) chip->irq_eoi(&desc->irq_data); if (chip->irq_mask) chip->irq_mask(&desc->irq_data); if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) chip->irq_disable(&desc->irq_data); } } void machine_crash_shutdown(struct pt_regs *regs) { default_machine_crash_shutdown(regs); } /* * Do what every setup is needed on image and the * reboot code buffer to allow us to avoid allocations * later. */ int machine_kexec_prepare(struct kimage *image) { if (ppc_md.machine_kexec_prepare) return ppc_md.machine_kexec_prepare(image); else return default_machine_kexec_prepare(image); } void machine_kexec_cleanup(struct kimage *image) { } void arch_crash_save_vmcoreinfo(void) { #ifdef CONFIG_NEED_MULTIPLE_NODES VMCOREINFO_SYMBOL(node_data); VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); #endif #ifndef CONFIG_NEED_MULTIPLE_NODES VMCOREINFO_SYMBOL(contig_page_data); #endif } /* * 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(); if (ppc_md.machine_kexec) ppc_md.machine_kexec(image); else default_machine_kexec(image); __ftrace_enabled_restore(save_ftrace_enabled); /* Fall back to normal restart if we're still alive. */ machine_restart(NULL); for(;;); } void __init reserve_crashkernel(void) { unsigned long long crash_size, crash_base; int ret; /* this is necessary because of memblock_phys_mem_size() */ memblock_analyze(); /* use common parsing */ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), &crash_size, &crash_base); if (ret == 0 && crash_size > 0) { crashk_res.start = crash_base; crashk_res.end = crash_base + crash_size - 1; } if (crashk_res.end == crashk_res.start) { crashk_res.start = crashk_res.end = 0; return; } /* We might have got these values via the command line or the * device tree, either way sanitise them now. */ crash_size = crashk_res.end - crashk_res.start + 1; #ifndef CONFIG_RELOCATABLE if (crashk_res.start != KDUMP_KERNELBASE) printk("Crash kernel location must be 0x%x\n", KDUMP_KERNELBASE); crashk_res.start = KDUMP_KERNELBASE; #else if (!crashk_res.start) { /* * unspecified address, choose a region of specified size * can overlap with initrd (ignoring corruption when retained) * ppc64 requires kernel and some stacks to be in first segemnt */ crashk_res.start = KDUMP_KERNELBASE; } crash_base = PAGE_ALIGN(crashk_res.start); if (crash_base != crashk_res.start) { printk("Crash kernel base must be aligned to 0x%lx\n", PAGE_SIZE); crashk_res.start = crash_base; } #endif crash_size = PAGE_ALIGN(crash_size); crashk_res.end = crashk_res.start + crash_size - 1; /* The crash region must not overlap the current kernel */ if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { printk(KERN_WARNING "Crash kernel can not overlap current kernel\n"); crashk_res.start = crashk_res.end = 0; return; } /* Crash kernel trumps memory limit */ if (memory_limit && memory_limit <= crashk_res.end) { memory_limit = crashk_res.end + 1; printk("Adjusted memory limit for crashkernel, now 0x%llx\n", (unsigned long long)memory_limit); } printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " "for crashkernel (System RAM: %ldMB)\n", (unsigned long)(crash_size >> 20), (unsigned long)(crashk_res.start >> 20), (unsigned long)(memblock_phys_mem_size() >> 20)); memblock_reserve(crashk_res.start, crash_size); } int overlaps_crashkernel(unsigned long start, unsigned long size) { return (start + size) > crashk_res.start && start <= crashk_res.end; } /* Values we need to export to the second kernel via the device tree. */ static phys_addr_t kernel_end; static phys_addr_t crashk_size; static struct property kernel_end_prop = { .name = "linux,kernel-end", .length = sizeof(phys_addr_t), .value = &kernel_end, }; static struct property crashk_base_prop = { .name = "linux,crashkernel-base", .length = sizeof(phys_addr_t), .value = &crashk_res.start, }; static struct property crashk_size_prop = { .name = "linux,crashkernel-size", .length = sizeof(phys_addr_t), .value = &crashk_size, }; static void __init export_crashk_values(struct device_node *node) { struct property *prop; /* There might be existing crash kernel properties, but we can't * be sure what's in them, so remove them. */ prop = of_find_property(node, "linux,crashkernel-base", NULL); if (prop) prom_remove_property(node, prop); prop = of_find_property(node, "linux,crashkernel-size", NULL); if (prop) prom_remove_property(node, prop); if (crashk_res.start != 0) { prom_add_property(node, &crashk_base_prop); crashk_size = crashk_res.end - crashk_res.start + 1; prom_add_property(node, &crashk_size_prop); } } static int __init kexec_setup(void) { struct device_node *node; struct property *prop; node = of_find_node_by_path("/chosen"); if (!node) return -ENOENT; /* remove any stale properties so ours can be found */ prop = of_find_property(node, kernel_end_prop.name, NULL); if (prop) prom_remove_property(node, prop); /* information needed by userspace when using default_machine_kexec */ kernel_end = __pa(_end); prom_add_property(node, &kernel_end_prop); export_crashk_values(node); of_node_put(node); return 0; } late_initcall(kexec_setup);