]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/powerpc/kernel/machine_kexec_file_64.c
2 * ppc64 code to implement the kexec_file_load syscall
4 * Copyright (C) 2004 Adam Litke (agl@us.ibm.com)
5 * Copyright (C) 2004 IBM Corp.
6 * Copyright (C) 2004,2005 Milton D Miller II, IBM Corporation
7 * Copyright (C) 2005 R Sharada (sharada@in.ibm.com)
8 * Copyright (C) 2006 Mohan Kumar M (mohan@in.ibm.com)
9 * Copyright (C) 2016 IBM Corporation
11 * Based on kexec-tools' kexec-elf-ppc64.c, fs2dt.c.
12 * Heavily modified for the kernel by
13 * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>.
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation (version 2 of the License).
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
25 #include <linux/slab.h>
26 #include <linux/kexec.h>
27 #include <linux/of_fdt.h>
28 #include <linux/libfdt.h>
31 #define SLAVE_CODE_SIZE 256
33 const struct kexec_file_ops
* const kexec_file_loaders
[] = {
38 int arch_kexec_kernel_image_probe(struct kimage
*image
, void *buf
,
39 unsigned long buf_len
)
41 /* We don't support crash kernels yet. */
42 if (image
->type
== KEXEC_TYPE_CRASH
)
45 return kexec_image_probe_default(image
, buf
, buf_len
);
49 * setup_purgatory - initialize the purgatory's global variables
50 * @image: kexec image.
51 * @slave_code: Slave code for the purgatory.
52 * @fdt: Flattened device tree for the next kernel.
53 * @kernel_load_addr: Address where the kernel is loaded.
54 * @fdt_load_addr: Address where the flattened device tree is loaded.
56 * Return: 0 on success, or negative errno on error.
58 int setup_purgatory(struct kimage
*image
, const void *slave_code
,
59 const void *fdt
, unsigned long kernel_load_addr
,
60 unsigned long fdt_load_addr
)
62 unsigned int *slave_code_buf
, master_entry
;
65 slave_code_buf
= kmalloc(SLAVE_CODE_SIZE
, GFP_KERNEL
);
69 /* Get the slave code from the new kernel and put it in purgatory. */
70 ret
= kexec_purgatory_get_set_symbol(image
, "purgatory_start",
71 slave_code_buf
, SLAVE_CODE_SIZE
,
74 kfree(slave_code_buf
);
78 master_entry
= slave_code_buf
[0];
79 memcpy(slave_code_buf
, slave_code
, SLAVE_CODE_SIZE
);
80 slave_code_buf
[0] = master_entry
;
81 ret
= kexec_purgatory_get_set_symbol(image
, "purgatory_start",
82 slave_code_buf
, SLAVE_CODE_SIZE
,
84 kfree(slave_code_buf
);
86 ret
= kexec_purgatory_get_set_symbol(image
, "kernel", &kernel_load_addr
,
87 sizeof(kernel_load_addr
), false);
90 ret
= kexec_purgatory_get_set_symbol(image
, "dt_offset", &fdt_load_addr
,
91 sizeof(fdt_load_addr
), false);
99 * delete_fdt_mem_rsv - delete memory reservation with given address and size
101 * Return: 0 on success, or negative errno on error.
103 int delete_fdt_mem_rsv(void *fdt
, unsigned long start
, unsigned long size
)
105 int i
, ret
, num_rsvs
= fdt_num_mem_rsv(fdt
);
107 for (i
= 0; i
< num_rsvs
; i
++) {
108 uint64_t rsv_start
, rsv_size
;
110 ret
= fdt_get_mem_rsv(fdt
, i
, &rsv_start
, &rsv_size
);
112 pr_err("Malformed device tree.\n");
116 if (rsv_start
== start
&& rsv_size
== size
) {
117 ret
= fdt_del_mem_rsv(fdt
, i
);
119 pr_err("Error deleting device tree reservation.\n");
131 * setup_new_fdt - modify /chosen and memory reservation for the next kernel
132 * @image: kexec image being loaded.
133 * @fdt: Flattened device tree for the next kernel.
134 * @initrd_load_addr: Address where the next initrd will be loaded.
135 * @initrd_len: Size of the next initrd, or 0 if there will be none.
136 * @cmdline: Command line for the next kernel, or NULL if there will
139 * Return: 0 on success, or negative errno on error.
141 int setup_new_fdt(const struct kimage
*image
, void *fdt
,
142 unsigned long initrd_load_addr
, unsigned long initrd_len
,
145 int ret
, chosen_node
;
148 /* Remove memory reservation for the current device tree. */
149 ret
= delete_fdt_mem_rsv(fdt
, __pa(initial_boot_params
),
150 fdt_totalsize(initial_boot_params
));
152 pr_debug("Removed old device tree reservation.\n");
153 else if (ret
!= -ENOENT
)
156 chosen_node
= fdt_path_offset(fdt
, "/chosen");
157 if (chosen_node
== -FDT_ERR_NOTFOUND
) {
158 chosen_node
= fdt_add_subnode(fdt
, fdt_path_offset(fdt
, "/"),
160 if (chosen_node
< 0) {
161 pr_err("Error creating /chosen.\n");
164 } else if (chosen_node
< 0) {
165 pr_err("Malformed device tree: error reading /chosen.\n");
169 /* Did we boot using an initrd? */
170 prop
= fdt_getprop(fdt
, chosen_node
, "linux,initrd-start", NULL
);
172 uint64_t tmp_start
, tmp_end
, tmp_size
;
174 tmp_start
= fdt64_to_cpu(*((const fdt64_t
*) prop
));
176 prop
= fdt_getprop(fdt
, chosen_node
, "linux,initrd-end", NULL
);
178 pr_err("Malformed device tree.\n");
181 tmp_end
= fdt64_to_cpu(*((const fdt64_t
*) prop
));
184 * kexec reserves exact initrd size, while firmware may
185 * reserve a multiple of PAGE_SIZE, so check for both.
187 tmp_size
= tmp_end
- tmp_start
;
188 ret
= delete_fdt_mem_rsv(fdt
, tmp_start
, tmp_size
);
190 ret
= delete_fdt_mem_rsv(fdt
, tmp_start
,
191 round_up(tmp_size
, PAGE_SIZE
));
193 pr_debug("Removed old initrd reservation.\n");
194 else if (ret
!= -ENOENT
)
197 /* If there's no new initrd, delete the old initrd's info. */
198 if (initrd_len
== 0) {
199 ret
= fdt_delprop(fdt
, chosen_node
,
200 "linux,initrd-start");
202 pr_err("Error deleting linux,initrd-start.\n");
206 ret
= fdt_delprop(fdt
, chosen_node
, "linux,initrd-end");
208 pr_err("Error deleting linux,initrd-end.\n");
215 ret
= fdt_setprop_u64(fdt
, chosen_node
,
216 "linux,initrd-start",
221 /* initrd-end is the first address after the initrd image. */
222 ret
= fdt_setprop_u64(fdt
, chosen_node
, "linux,initrd-end",
223 initrd_load_addr
+ initrd_len
);
227 ret
= fdt_add_mem_rsv(fdt
, initrd_load_addr
, initrd_len
);
229 pr_err("Error reserving initrd memory: %s\n",
235 if (cmdline
!= NULL
) {
236 ret
= fdt_setprop_string(fdt
, chosen_node
, "bootargs", cmdline
);
240 ret
= fdt_delprop(fdt
, chosen_node
, "bootargs");
241 if (ret
&& ret
!= -FDT_ERR_NOTFOUND
) {
242 pr_err("Error deleting bootargs.\n");
247 ret
= setup_ima_buffer(image
, fdt
, chosen_node
);
249 pr_err("Error setting up the new device tree.\n");
253 ret
= fdt_setprop(fdt
, chosen_node
, "linux,booted-from-kexec", NULL
, 0);
260 pr_err("Error setting up the new device tree.\n");