projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 40b0b3f8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 3d1229d6 ME |
2 | /* |
| 3 | * PPC32 code to handle Linux booting another kernel. | |
| 4 | * | |
| 5 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> | |
| 6 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz | |
| 7 | * Copyright (C) 2005 IBM Corporation. | |
| 3d1229d6 ME |
8 | */ |
| 9 | ||
| 10 | #include <linux/kexec.h> | |
| 11 | #include <linux/mm.h> | |
| 12 | #include <linux/string.h> | |
| 13 | #include <asm/cacheflush.h> | |
| 14 | #include <asm/hw_irq.h> | |
| 15 | #include <asm/io.h> | |
| 16 | ||
| 9402c95f | 17 | typedef void (*relocate_new_kernel_t)( |
| 3d1229d6 ME |
18 | unsigned long indirection_page, |
| 19 | unsigned long reboot_code_buffer, | |
| ff2d8b19 | 20 | unsigned long start_address) __noreturn; |
| 3d1229d6 ME |
21 | |
| 22 | /* | |
| 23 | * This is a generic machine_kexec function suitable at least for | |
| 24 | * non-OpenFirmware embedded platforms. | |
| 25 | * It merely copies the image relocation code to the control page and | |
| 26 | * jumps to it. | |
| 27 | * A platform specific function may just call this one. | |
| 28 | */ | |
| 29 | void default_machine_kexec(struct kimage *image) | |
| 30 | { | |
| 2efe55a9 | 31 | extern const unsigned int relocate_new_kernel_size; |
| 3d1229d6 ME |
32 | unsigned long page_list; |
| 33 | unsigned long reboot_code_buffer, reboot_code_buffer_phys; | |
| 34 | relocate_new_kernel_t rnk; | |
| 35 | ||
| 36 | /* Interrupts aren't acceptable while we reboot */ | |
| 37 | local_irq_disable(); | |
| 38 | ||
| c71635d2 MM |
39 | /* mask each interrupt so we are in a more sane state for the |
| 40 | * kexec kernel */ | |
| 41 | machine_kexec_mask_interrupts(); | |
| 42 | ||
| 3d1229d6 ME |
43 | page_list = image->head; |
| 44 | ||
| 45 | /* we need both effective and real address here */ | |
| 46 | reboot_code_buffer = | |
| 47 | (unsigned long)page_address(image->control_code_page); | |
| 48 | reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer); | |
| 49 | ||
| 50 | /* copy our kernel relocation code to the control code page */ | |
| 51 | memcpy((void *)reboot_code_buffer, relocate_new_kernel, | |
| 52 | relocate_new_kernel_size); | |
| 53 | ||
| 54 | flush_icache_range(reboot_code_buffer, | |
| 163f6876 | 55 | reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); |
| 3d1229d6 ME |
56 | printk(KERN_INFO "Bye!\n"); |
| 57 | ||
| dfc3095c | 58 | if (!IS_ENABLED(CONFIG_PPC_85xx) && !IS_ENABLED(CONFIG_44x)) |
| 6c284228 CL |
59 | relocate_new_kernel(page_list, reboot_code_buffer_phys, image->start); |
| 60 | ||
| 3d1229d6 ME |
61 | /* now call it */ |
| 62 | rnk = (relocate_new_kernel_t) reboot_code_buffer; | |
| 63 | (*rnk)(page_list, reboot_code_buffer_phys, image->start); | |
| 64 | } | |
| 65 | ||
| 8f7fadb4 | 66 | int machine_kexec_prepare(struct kimage *image) |
| 3d1229d6 ME |
67 | { |
| 68 | return 0; | |
| 69 | } |