/*
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* Read a coreboot rmodule and execute it.
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* The rmodule_header struct is from coreboot.
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*
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* Copyright (c) 2016 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/arch/pei_data.h>
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#define RMODULE_MAGIC 0xf8fe
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#define RMODULE_VERSION_1 1
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/*
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* All fields with '_offset' in the name are byte offsets into the flat blob.
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* The linker and the linker script takes are of assigning the values.
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*/
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struct rmodule_header {
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uint16_t magic;
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uint8_t version;
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uint8_t type;
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/* The payload represents the program's loadable code and data */
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uint32_t payload_begin_offset;
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uint32_t payload_end_offset;
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/* Begin and of relocation information about the program module */
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uint32_t relocations_begin_offset;
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uint32_t relocations_end_offset;
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/*
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* The starting address of the linked program. This address is vital
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* for determining relocation offsets as the relocation info and other
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* symbols (bss, entry point) need this value as a basis to calculate
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* the offsets.
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*/
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uint32_t module_link_start_address;
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/*
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* The module_program_size is the size of memory used while running
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* the program. The program is assumed to consume a contiguous amount
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* of memory
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*/
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uint32_t module_program_size;
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/* This is program's execution entry point */
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uint32_t module_entry_point;
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/*
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* Optional parameter structure that can be used to pass data into
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* the module
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*/
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uint32_t parameters_begin;
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uint32_t parameters_end;
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/* BSS section information so the loader can clear the bss */
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uint32_t bss_begin;
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uint32_t bss_end;
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/* Add some room for growth */
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uint32_t padding[4];
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} __packed;
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/**
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* cpu_run_reference_code() - Run the platform reference code
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*
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* Some platforms require a binary blob to be executed once SDRAM is
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* available. This is used to set up various platform features, such as the
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* platform controller hub (PCH). This function should be implemented by the
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* CPU-specific code.
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*
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* @return 0 on success, -ve on failure
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*/
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static int cpu_run_reference_code(void)
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{
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struct pei_data _pei_data __aligned(8);
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struct pei_data *pei_data = &_pei_data;
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asmlinkage int (*func)(void *);
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struct rmodule_header *hdr;
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char *src, *dest;
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int ret, dummy;
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int size;
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hdr = (struct rmodule_header *)CONFIG_X86_REFCODE_ADDR;
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debug("Extracting code from rmodule at %p\n", hdr);
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if (hdr->magic != RMODULE_MAGIC) {
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debug("Invalid rmodule magic\n");
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return -EINVAL;
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}
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if (hdr->module_link_start_address != 0) {
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debug("Link start address must be 0\n");
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return -EPERM;
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}
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if (hdr->module_entry_point != 0) {
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debug("Entry point must be 0\n");
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return -EPERM;
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}
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memset(pei_data, '\0', sizeof(struct pei_data));
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broadwell_fill_pei_data(pei_data);
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mainboard_fill_pei_data(pei_data);
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pei_data->saved_data = (void *)&dummy;
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src = (char *)hdr + hdr->payload_begin_offset;
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dest = (char *)CONFIG_X86_REFCODE_RUN_ADDR;
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size = hdr->payload_end_offset - hdr->payload_begin_offset;
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debug("Copying refcode from %p to %p, size %x\n", src, dest, size);
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memcpy(dest, src, size);
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size = hdr->bss_end - hdr->bss_begin;
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debug("Zeroing BSS at %p, size %x\n", dest + hdr->bss_begin, size);
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memset(dest + hdr->bss_begin, '\0', size);
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func = (asmlinkage int (*)(void *))dest;
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debug("Running reference code at %p\n", func);
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#ifdef DEBUG
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print_buffer(CONFIG_X86_REFCODE_RUN_ADDR, (void *)func, 1, 0x40, 0);
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#endif
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ret = func(pei_data);
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if (ret != 0) {
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debug("Reference code returned %d\n", ret);
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return -EL2HLT;
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}
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debug("Refereence code completed\n");
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return 0;
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}
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int arch_early_init_r(void)
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{
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return cpu_run_reference_code();
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}
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