cregit-Linux how code gets into the kernel

Release 4.10 drivers/remoteproc/qcom_mdt_loader.c

/*
 * Qualcomm Peripheral Image Loader
 *
 * Copyright (C) 2016 Linaro Ltd
 * Copyright (C) 2015 Sony Mobile Communications Inc
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/elf.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/remoteproc.h>
#include <linux/sizes.h>
#include <linux/slab.h>

#include "remoteproc_internal.h"
#include "qcom_mdt_loader.h"

/**
 * qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
 * @rproc:      remoteproc handle
 * @fw:         firmware header
 * @tablesz:    outgoing size of the table
 *
 * Returns a dummy table.
 */

struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc, const struct firmware *fw, int *tablesz) { static struct resource_table table = { .ver = 1, }; *tablesz = sizeof(table); return &table; }

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bjorn anderssonbjorn andersson46100.00%1100.00%
Total46100.00%1100.00%

EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table); /** * qcom_mdt_parse() - extract useful parameters from the mdt header * @fw: firmware handle * @fw_addr: optional reference for base of the firmware's memory region * @fw_size: optional reference for size of the firmware's memory region * @fw_relocate: optional reference for flagging if the firmware is relocatable * * Returns 0 on success, negative errno otherwise. */
int qcom_mdt_parse(const struct firmware *fw, phys_addr_t *fw_addr, size_t *fw_size, bool *fw_relocate) { const struct elf32_phdr *phdrs; const struct elf32_phdr *phdr; const struct elf32_hdr *ehdr; phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX; phys_addr_t max_addr = 0; bool relocate = false; int i; ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1); for (i = 0; i < ehdr->e_phnum; i++) { phdr = &phdrs[i]; if (phdr->p_type != PT_LOAD) continue; if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) continue; if (!phdr->p_memsz) continue; if (phdr->p_flags & QCOM_MDT_RELOCATABLE) relocate = true; if (phdr->p_paddr < min_addr) min_addr = phdr->p_paddr; if (phdr->p_paddr + phdr->p_memsz > max_addr) max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K); } if (fw_addr) *fw_addr = min_addr; if (fw_size) *fw_size = max_addr - min_addr; if (fw_relocate) *fw_relocate = relocate; return 0; }

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bjorn anderssonbjorn andersson226100.00%1100.00%
Total226100.00%1100.00%

EXPORT_SYMBOL_GPL(qcom_mdt_parse); /** * qcom_mdt_load() - load the firmware which header is defined in fw * @rproc: rproc handle * @fw: frimware object for the header * @firmware: filename of the firmware, for building .bXX names * * Returns 0 on success, negative errno otherwise. */
int qcom_mdt_load(struct rproc *rproc, const struct firmware *fw, const char *firmware) { const struct elf32_phdr *phdrs; const struct elf32_phdr *phdr; const struct elf32_hdr *ehdr; size_t fw_name_len; char *fw_name; void *ptr; int ret; int i; ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1); fw_name_len = strlen(firmware); if (fw_name_len <= 4) return -EINVAL; fw_name = kstrdup(firmware, GFP_KERNEL); if (!fw_name) return -ENOMEM; for (i = 0; i < ehdr->e_phnum; i++) { phdr = &phdrs[i]; if (phdr->p_type != PT_LOAD) continue; if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) continue; if (!phdr->p_memsz) continue; ptr = rproc_da_to_va(rproc, phdr->p_paddr, phdr->p_memsz); if (!ptr) { dev_err(&rproc->dev, "segment outside memory range\n"); ret = -EINVAL; break; } if (phdr->p_filesz) { sprintf(fw_name + fw_name_len - 3, "b%02d", i); ret = request_firmware(&fw, fw_name, &rproc->dev); if (ret) { dev_err(&rproc->dev, "failed to load %s\n", fw_name); break; } memcpy(ptr, fw->data, fw->size); release_firmware(fw); } if (phdr->p_memsz > phdr->p_filesz) memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz); } kfree(fw_name); return ret; }

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bjorn anderssonbjorn andersson318100.00%1100.00%
Total318100.00%1100.00%

EXPORT_SYMBOL_GPL(qcom_mdt_load); MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format"); MODULE_LICENSE("GPL v2");

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bjorn anderssonbjorn andersson64399.54%150.00%
stanimir varbanovstanimir varbanov30.46%150.00%
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