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+/*
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+ * Remote Processor Framework Elf loader
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+ *
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+ * Copyright (C) 2011 Texas Instruments, Inc.
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+ * Copyright (C) 2011 Google, Inc.
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+ *
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+ * Ohad Ben-Cohen <ohad@wizery.com>
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+ * Brian Swetland <swetland@google.com>
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+ * Mark Grosen <mgrosen@ti.com>
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+ * Fernando Guzman Lugo <fernando.lugo@ti.com>
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+ * Suman Anna <s-anna@ti.com>
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+ * Robert Tivy <rtivy@ti.com>
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+ * Armando Uribe De Leon <x0095078@ti.com>
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+ * Sjur Brændeland <sjur.brandeland@stericsson.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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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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+
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+#define pr_fmt(fmt) "%s: " fmt, __func__
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+
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+#include <linux/module.h>
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+#include <linux/firmware.h>
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+#include <linux/remoteproc.h>
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+#include <linux/elf.h>
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+
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+#include "remoteproc_internal.h"
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+
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+/**
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+ * rproc_fw_sanity_check() - Sanity Check ELF firmware image
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+ * @rproc: the remote processor handle
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+ * @fw: the ELF firmware image
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+ *
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+ * Make sure this fw image is sane.
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+ */
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+int
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+rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
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+{
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+ const char *name = rproc->firmware;
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+ struct device *dev = &rproc->dev;
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+ struct elf32_hdr *ehdr;
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+ char class;
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+
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+ if (!fw) {
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+ dev_err(dev, "failed to load %s\n", name);
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+ return -EINVAL;
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+ }
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+
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+ if (fw->size < sizeof(struct elf32_hdr)) {
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+ dev_err(dev, "Image is too small\n");
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+ return -EINVAL;
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+ }
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+
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+ ehdr = (struct elf32_hdr *)fw->data;
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+
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+ /* We only support ELF32 at this point */
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+ class = ehdr->e_ident[EI_CLASS];
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+ if (class != ELFCLASS32) {
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+ dev_err(dev, "Unsupported class: %d\n", class);
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+ return -EINVAL;
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+ }
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+
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+ /* We assume the firmware has the same endianess as the host */
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+# ifdef __LITTLE_ENDIAN
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+ if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
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+# else /* BIG ENDIAN */
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+ if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
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+# endif
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+ dev_err(dev, "Unsupported firmware endianess\n");
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+ return -EINVAL;
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+ }
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+
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+ if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
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+ dev_err(dev, "Image is too small\n");
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+ return -EINVAL;
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+ }
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+
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+ if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
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+ dev_err(dev, "Image is corrupted (bad magic)\n");
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+ return -EINVAL;
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+ }
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+
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+ if (ehdr->e_phnum == 0) {
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+ dev_err(dev, "No loadable segments\n");
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+ return -EINVAL;
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+ }
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+
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+ if (ehdr->e_phoff > fw->size) {
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+ dev_err(dev, "Firmware size is too small\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * rproc_get_boot_addr() - Get rproc's boot address.
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+ * @rproc: the remote processor handle
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+ * @fw: the ELF firmware image
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+ *
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+ * This function returns the entry point address of the ELF
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+ * image.
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+ *
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+ * Note that the boot address is not a configurable property of all remote
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+ * processors. Some will always boot at a specific hard-coded address.
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+ */
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+u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
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+{
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+ struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
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+
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+ return ehdr->e_entry;
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+}
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+
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+/**
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+ * rproc_load_segments() - load firmware segments to memory
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+ * @rproc: remote processor which will be booted using these fw segments
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+ * @fw: the ELF firmware image
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+ *
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+ * This function loads the firmware segments to memory, where the remote
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+ * processor expects them.
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+ *
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+ * Some remote processors will expect their code and data to be placed
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+ * in specific device addresses, and can't have them dynamically assigned.
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+ *
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+ * We currently support only those kind of remote processors, and expect
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+ * the program header's paddr member to contain those addresses. We then go
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+ * through the physically contiguous "carveout" memory regions which we
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+ * allocated (and mapped) earlier on behalf of the remote processor,
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+ * and "translate" device address to kernel addresses, so we can copy the
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+ * segments where they are expected.
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+ *
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+ * Currently we only support remote processors that required carveout
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+ * allocations and got them mapped onto their iommus. Some processors
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+ * might be different: they might not have iommus, and would prefer to
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+ * directly allocate memory for every segment/resource. This is not yet
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+ * supported, though.
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+ */
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+int
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+rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
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+{
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+ struct device *dev = &rproc->dev;
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+ struct elf32_hdr *ehdr;
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+ struct elf32_phdr *phdr;
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+ int i, ret = 0;
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+ const u8 *elf_data = fw->data;
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+
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+ ehdr = (struct elf32_hdr *)elf_data;
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+ phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
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+
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+ /* go through the available ELF segments */
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+ for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
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+ u32 da = phdr->p_paddr;
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+ u32 memsz = phdr->p_memsz;
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+ u32 filesz = phdr->p_filesz;
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+ u32 offset = phdr->p_offset;
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+ void *ptr;
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+
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+ if (phdr->p_type != PT_LOAD)
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+ continue;
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+
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+ dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
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+ phdr->p_type, da, memsz, filesz);
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+
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+ if (filesz > memsz) {
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+ dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
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+ filesz, memsz);
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+ ret = -EINVAL;
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+ break;
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+ }
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+
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+ if (offset + filesz > fw->size) {
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+ dev_err(dev, "truncated fw: need 0x%x avail 0x%x\n",
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+ offset + filesz, fw->size);
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+ ret = -EINVAL;
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+ break;
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+ }
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+
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+ /* grab the kernel address for this device address */
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+ ptr = rproc_da_to_va(rproc, da, memsz);
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+ if (!ptr) {
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+ dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
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+ ret = -EINVAL;
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+ break;
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+ }
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+
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+ /* put the segment where the remote processor expects it */
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+ if (phdr->p_filesz)
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+ memcpy(ptr, elf_data + phdr->p_offset, filesz);
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+
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+ /*
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+ * Zero out remaining memory for this segment.
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+ *
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+ * This isn't strictly required since dma_alloc_coherent already
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+ * did this for us. albeit harmless, we may consider removing
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+ * this.
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+ */
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+ if (memsz > filesz)
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+ memset(ptr + filesz, 0, memsz - filesz);
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+ }
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+
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+ return ret;
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+}
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+
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+/**
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+ * rproc_find_rsc_table() - find the resource table
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+ * @rproc: the rproc handle
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+ * @fw: the ELF firmware image
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+ * @tablesz: place holder for providing back the table size
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+ *
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+ * This function finds the resource table inside the remote processor's
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+ * firmware. It is used both upon the registration of @rproc (in order
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+ * to look for and register the supported virito devices), and when the
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+ * @rproc is booted.
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+ *
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+ * Returns the pointer to the resource table if it is found, and write its
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+ * size into @tablesz. If a valid table isn't found, NULL is returned
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+ * (and @tablesz isn't set).
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+ */
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+struct resource_table *
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+rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
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+ int *tablesz)
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+{
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+ struct elf32_hdr *ehdr;
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+ struct elf32_shdr *shdr;
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+ const char *name_table;
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+ struct device *dev = &rproc->dev;
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+ struct resource_table *table = NULL;
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+ int i;
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+ const u8 *elf_data = fw->data;
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+
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+ ehdr = (struct elf32_hdr *)elf_data;
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+ shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
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+ name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
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+
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+ /* look for the resource table and handle it */
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+ for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
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+ int size = shdr->sh_size;
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+ int offset = shdr->sh_offset;
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+
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+ if (strcmp(name_table + shdr->sh_name, ".resource_table"))
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+ continue;
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+
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+ table = (struct resource_table *)(elf_data + offset);
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+
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+ /* make sure we have the entire table */
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+ if (offset + size > fw->size) {
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+ dev_err(dev, "resource table truncated\n");
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+ return NULL;
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+ }
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+
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+ /* make sure table has at least the header */
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+ if (sizeof(struct resource_table) > size) {
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+ dev_err(dev, "header-less resource table\n");
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+ return NULL;
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+ }
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+
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+ /* we don't support any version beyond the first */
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+ if (table->ver != 1) {
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+ dev_err(dev, "unsupported fw ver: %d\n", table->ver);
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+ return NULL;
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+ }
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+
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+ /* make sure reserved bytes are zeroes */
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+ if (table->reserved[0] || table->reserved[1]) {
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+ dev_err(dev, "non zero reserved bytes\n");
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+ return NULL;
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+ }
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+
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+ /* make sure the offsets array isn't truncated */
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+ if (table->num * sizeof(table->offset[0]) +
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+ sizeof(struct resource_table) > size) {
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+ dev_err(dev, "resource table incomplete\n");
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+ return NULL;
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+ }
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+
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+ *tablesz = shdr->sh_size;
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+ break;
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+ }
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+
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+ return table;
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+}
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Sjur Brændeland