mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-07 19:56:18 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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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