mirror of https://gitee.com/openkylin/linux.git
263 lines
7.2 KiB
C
263 lines
7.2 KiB
C
/*
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* ppc64 code to implement the kexec_file_load syscall
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*
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* Copyright (C) 2004 Adam Litke (agl@us.ibm.com)
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* Copyright (C) 2004 IBM Corp.
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* Copyright (C) 2004,2005 Milton D Miller II, IBM Corporation
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* Copyright (C) 2005 R Sharada (sharada@in.ibm.com)
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* Copyright (C) 2006 Mohan Kumar M (mohan@in.ibm.com)
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* Copyright (C) 2016 IBM Corporation
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*
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* Based on kexec-tools' kexec-elf-ppc64.c, fs2dt.c.
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* Heavily modified for the kernel by
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* Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation (version 2 of the License).
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/kexec.h>
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#include <linux/of_fdt.h>
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#include <linux/libfdt.h>
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#include <asm/ima.h>
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#define SLAVE_CODE_SIZE 256
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const struct kexec_file_ops * const kexec_file_loaders[] = {
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&kexec_elf64_ops,
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NULL
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};
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int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
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unsigned long buf_len)
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{
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/* We don't support crash kernels yet. */
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if (image->type == KEXEC_TYPE_CRASH)
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return -EOPNOTSUPP;
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return kexec_image_probe_default(image, buf, buf_len);
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}
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/**
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* setup_purgatory - initialize the purgatory's global variables
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* @image: kexec image.
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* @slave_code: Slave code for the purgatory.
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* @fdt: Flattened device tree for the next kernel.
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* @kernel_load_addr: Address where the kernel is loaded.
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* @fdt_load_addr: Address where the flattened device tree is loaded.
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*
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* Return: 0 on success, or negative errno on error.
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*/
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int setup_purgatory(struct kimage *image, const void *slave_code,
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const void *fdt, unsigned long kernel_load_addr,
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unsigned long fdt_load_addr)
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{
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unsigned int *slave_code_buf, master_entry;
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int ret;
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slave_code_buf = kmalloc(SLAVE_CODE_SIZE, GFP_KERNEL);
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if (!slave_code_buf)
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return -ENOMEM;
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/* Get the slave code from the new kernel and put it in purgatory. */
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ret = kexec_purgatory_get_set_symbol(image, "purgatory_start",
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slave_code_buf, SLAVE_CODE_SIZE,
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true);
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if (ret) {
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kfree(slave_code_buf);
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return ret;
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}
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master_entry = slave_code_buf[0];
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memcpy(slave_code_buf, slave_code, SLAVE_CODE_SIZE);
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slave_code_buf[0] = master_entry;
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ret = kexec_purgatory_get_set_symbol(image, "purgatory_start",
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slave_code_buf, SLAVE_CODE_SIZE,
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false);
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kfree(slave_code_buf);
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ret = kexec_purgatory_get_set_symbol(image, "kernel", &kernel_load_addr,
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sizeof(kernel_load_addr), false);
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if (ret)
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return ret;
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ret = kexec_purgatory_get_set_symbol(image, "dt_offset", &fdt_load_addr,
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sizeof(fdt_load_addr), false);
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if (ret)
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return ret;
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return 0;
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}
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/**
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* delete_fdt_mem_rsv - delete memory reservation with given address and size
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*
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* Return: 0 on success, or negative errno on error.
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*/
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int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
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{
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int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
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for (i = 0; i < num_rsvs; i++) {
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uint64_t rsv_start, rsv_size;
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ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
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if (ret) {
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pr_err("Malformed device tree.\n");
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return -EINVAL;
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}
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if (rsv_start == start && rsv_size == size) {
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ret = fdt_del_mem_rsv(fdt, i);
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if (ret) {
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pr_err("Error deleting device tree reservation.\n");
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return -EINVAL;
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}
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return 0;
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}
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}
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return -ENOENT;
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}
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/*
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* setup_new_fdt - modify /chosen and memory reservation for the next kernel
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* @image: kexec image being loaded.
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* @fdt: Flattened device tree for the next kernel.
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* @initrd_load_addr: Address where the next initrd will be loaded.
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* @initrd_len: Size of the next initrd, or 0 if there will be none.
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* @cmdline: Command line for the next kernel, or NULL if there will
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* be none.
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*
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* Return: 0 on success, or negative errno on error.
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*/
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int setup_new_fdt(const struct kimage *image, void *fdt,
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unsigned long initrd_load_addr, unsigned long initrd_len,
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const char *cmdline)
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{
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int ret, chosen_node;
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const void *prop;
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/* Remove memory reservation for the current device tree. */
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ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
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fdt_totalsize(initial_boot_params));
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if (ret == 0)
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pr_debug("Removed old device tree reservation.\n");
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else if (ret != -ENOENT)
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return ret;
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chosen_node = fdt_path_offset(fdt, "/chosen");
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if (chosen_node == -FDT_ERR_NOTFOUND) {
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chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
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"chosen");
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if (chosen_node < 0) {
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pr_err("Error creating /chosen.\n");
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return -EINVAL;
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}
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} else if (chosen_node < 0) {
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pr_err("Malformed device tree: error reading /chosen.\n");
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return -EINVAL;
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}
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/* Did we boot using an initrd? */
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prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
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if (prop) {
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uint64_t tmp_start, tmp_end, tmp_size;
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tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
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prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
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if (!prop) {
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pr_err("Malformed device tree.\n");
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return -EINVAL;
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}
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tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
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/*
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* kexec reserves exact initrd size, while firmware may
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* reserve a multiple of PAGE_SIZE, so check for both.
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*/
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tmp_size = tmp_end - tmp_start;
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ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
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if (ret == -ENOENT)
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ret = delete_fdt_mem_rsv(fdt, tmp_start,
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round_up(tmp_size, PAGE_SIZE));
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if (ret == 0)
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pr_debug("Removed old initrd reservation.\n");
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else if (ret != -ENOENT)
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return ret;
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/* If there's no new initrd, delete the old initrd's info. */
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if (initrd_len == 0) {
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ret = fdt_delprop(fdt, chosen_node,
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"linux,initrd-start");
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if (ret) {
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pr_err("Error deleting linux,initrd-start.\n");
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return -EINVAL;
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}
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ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
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if (ret) {
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pr_err("Error deleting linux,initrd-end.\n");
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return -EINVAL;
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}
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}
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}
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if (initrd_len) {
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ret = fdt_setprop_u64(fdt, chosen_node,
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"linux,initrd-start",
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initrd_load_addr);
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if (ret < 0)
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goto err;
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/* initrd-end is the first address after the initrd image. */
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ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
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initrd_load_addr + initrd_len);
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if (ret < 0)
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goto err;
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ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
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if (ret) {
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pr_err("Error reserving initrd memory: %s\n",
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fdt_strerror(ret));
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return -EINVAL;
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}
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}
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if (cmdline != NULL) {
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ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
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if (ret < 0)
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goto err;
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} else {
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ret = fdt_delprop(fdt, chosen_node, "bootargs");
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if (ret && ret != -FDT_ERR_NOTFOUND) {
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pr_err("Error deleting bootargs.\n");
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return -EINVAL;
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}
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}
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ret = setup_ima_buffer(image, fdt, chosen_node);
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if (ret) {
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pr_err("Error setting up the new device tree.\n");
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return ret;
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}
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ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
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if (ret)
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goto err;
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return 0;
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err:
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pr_err("Error setting up the new device tree.\n");
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return -EINVAL;
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}
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