diff options
Diffstat (limited to 'arch/sh/kernel/machine_kexec.c')
| -rw-r--r-- | arch/sh/kernel/machine_kexec.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c new file mode 100644 index 000000000..223c14f44 --- /dev/null +++ b/arch/sh/kernel/machine_kexec.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * machine_kexec.c - handle transition of Linux booting another kernel + * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> + * + * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz + * LANDISK/sh4 supported by kogiidena + */ +#include <linux/mm.h> +#include <linux/kexec.h> +#include <linux/delay.h> +#include <linux/reboot.h> +#include <linux/numa.h> +#include <linux/ftrace.h> +#include <linux/suspend.h> +#include <linux/memblock.h> +#include <asm/mmu_context.h> +#include <asm/io.h> +#include <asm/cacheflush.h> +#include <asm/sh_bios.h> +#include <asm/reboot.h> + +typedef void (*relocate_new_kernel_t)(unsigned long indirection_page, + unsigned long reboot_code_buffer, + unsigned long start_address); + +extern const unsigned char relocate_new_kernel[]; +extern const unsigned int relocate_new_kernel_size; +extern void *vbr_base; + +void native_machine_crash_shutdown(struct pt_regs *regs) +{ + /* Nothing to do for UP, but definitely broken for SMP.. */ +} + +/* + * 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) +{ + return 0; +} + +void machine_kexec_cleanup(struct kimage *image) +{ +} + +static void kexec_info(struct kimage *image) +{ + int i; + printk("kexec information\n"); + for (i = 0; i < image->nr_segments; i++) { + printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", + i, + (unsigned int)image->segment[i].mem, + (unsigned int)image->segment[i].mem + + image->segment[i].memsz, + (unsigned int)image->segment[i].memsz); + } + printk(" start : 0x%08x\n\n", (unsigned int)image->start); +} + +/* + * 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) +{ + unsigned long page_list; + unsigned long reboot_code_buffer; + relocate_new_kernel_t rnk; + unsigned long entry; + unsigned long *ptr; + int save_ftrace_enabled; + + /* + * Nicked from the mips version of machine_kexec(): + * The generic kexec code builds a page list with physical + * addresses. Use phys_to_virt() to convert them to virtual. + */ + for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); + ptr = (entry & IND_INDIRECTION) ? + phys_to_virt(entry & PAGE_MASK) : ptr + 1) { + if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || + *ptr & IND_DESTINATION) + *ptr = (unsigned long) phys_to_virt(*ptr); + } + +#ifdef CONFIG_KEXEC_JUMP + if (image->preserve_context) + save_processor_state(); +#endif + + save_ftrace_enabled = __ftrace_enabled_save(); + + /* Interrupts aren't acceptable while we reboot */ + local_irq_disable(); + + page_list = image->head; + + /* we need both effective and real address here */ + reboot_code_buffer = + (unsigned long)page_address(image->control_code_page); + + /* copy our kernel relocation code to the control code page */ + memcpy((void *)reboot_code_buffer, relocate_new_kernel, + relocate_new_kernel_size); + + kexec_info(image); + flush_cache_all(); + + sh_bios_vbr_reload(); + + /* now call it */ + rnk = (relocate_new_kernel_t) reboot_code_buffer; + (*rnk)(page_list, reboot_code_buffer, + (unsigned long)phys_to_virt(image->start)); + +#ifdef CONFIG_KEXEC_JUMP + asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory"); + + if (image->preserve_context) + restore_processor_state(); + + /* Convert page list back to physical addresses, what a mess. */ + for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); + ptr = (*ptr & IND_INDIRECTION) ? + phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) { + if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || + *ptr & IND_DESTINATION) + *ptr = virt_to_phys(*ptr); + } +#endif + + __ftrace_enabled_restore(save_ftrace_enabled); +} + +void arch_crash_save_vmcoreinfo(void) +{ +#ifdef CONFIG_NUMA + VMCOREINFO_SYMBOL(node_data); + VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); +#endif +#ifdef CONFIG_X2TLB + VMCOREINFO_CONFIG(X2TLB); +#endif +} + +void __init reserve_crashkernel(void) +{ + unsigned long long crash_size, crash_base; + int ret; + + 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) + goto disable; + + crash_size = PAGE_ALIGN(resource_size(&crashk_res)); + if (!crashk_res.start) { + unsigned long max = memblock_end_of_DRAM() - memory_limit; + crashk_res.start = memblock_phys_alloc_range(crash_size, + PAGE_SIZE, 0, max); + if (!crashk_res.start) { + pr_err("crashkernel allocation failed\n"); + goto disable; + } + } else { + ret = memblock_reserve(crashk_res.start, crash_size); + if (unlikely(ret < 0)) { + pr_err("crashkernel reservation failed - " + "memory is in use\n"); + goto disable; + } + } + + crashk_res.end = crashk_res.start + crash_size - 1; + + /* + * Crash kernel trumps memory limit + */ + if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) { + memory_limit = 0; + pr_info("Disabled memory limit for crashkernel\n"); + } + + pr_info("Reserving %ldMB of memory at 0x%08lx " + "for crashkernel (System RAM: %ldMB)\n", + (unsigned long)(crash_size >> 20), + (unsigned long)(crashk_res.start), + (unsigned long)(memblock_phys_mem_size() >> 20)); + + return; + +disable: + crashk_res.start = crashk_res.end = 0; +} |