mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Read a coreboot rmodule and execute it.
|
|
* The rmodule_header struct is from coreboot.
|
|
*
|
|
* Copyright (c) 2016 Google, Inc
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <errno.h>
|
|
#include <init.h>
|
|
#include <log.h>
|
|
#include <asm/arch/pei_data.h>
|
|
|
|
#define RMODULE_MAGIC 0xf8fe
|
|
#define RMODULE_VERSION_1 1
|
|
|
|
/*
|
|
* All fields with '_offset' in the name are byte offsets into the flat blob.
|
|
* The linker and the linker script takes are of assigning the values.
|
|
*/
|
|
struct rmodule_header {
|
|
uint16_t magic;
|
|
uint8_t version;
|
|
uint8_t type;
|
|
/* The payload represents the program's loadable code and data */
|
|
uint32_t payload_begin_offset;
|
|
uint32_t payload_end_offset;
|
|
/* Begin and of relocation information about the program module */
|
|
uint32_t relocations_begin_offset;
|
|
uint32_t relocations_end_offset;
|
|
/*
|
|
* The starting address of the linked program. This address is vital
|
|
* for determining relocation offsets as the relocation info and other
|
|
* symbols (bss, entry point) need this value as a basis to calculate
|
|
* the offsets.
|
|
*/
|
|
uint32_t module_link_start_address;
|
|
/*
|
|
* The module_program_size is the size of memory used while running
|
|
* the program. The program is assumed to consume a contiguous amount
|
|
* of memory
|
|
*/
|
|
uint32_t module_program_size;
|
|
/* This is program's execution entry point */
|
|
uint32_t module_entry_point;
|
|
/*
|
|
* Optional parameter structure that can be used to pass data into
|
|
* the module
|
|
*/
|
|
uint32_t parameters_begin;
|
|
uint32_t parameters_end;
|
|
/* BSS section information so the loader can clear the bss */
|
|
uint32_t bss_begin;
|
|
uint32_t bss_end;
|
|
/* Add some room for growth */
|
|
uint32_t padding[4];
|
|
} __packed;
|
|
|
|
/**
|
|
* cpu_run_reference_code() - Run the platform reference code
|
|
*
|
|
* Some platforms require a binary blob to be executed once SDRAM is
|
|
* available. This is used to set up various platform features, such as the
|
|
* platform controller hub (PCH). This function should be implemented by the
|
|
* CPU-specific code.
|
|
*
|
|
* @return 0 on success, -ve on failure
|
|
*/
|
|
static int cpu_run_reference_code(void)
|
|
{
|
|
struct pei_data _pei_data __aligned(8);
|
|
struct pei_data *pei_data = &_pei_data;
|
|
asmlinkage int (*func)(void *);
|
|
struct rmodule_header *hdr;
|
|
char *src, *dest;
|
|
int ret, dummy;
|
|
int size;
|
|
|
|
hdr = (struct rmodule_header *)CONFIG_X86_REFCODE_ADDR;
|
|
debug("Extracting code from rmodule at %p\n", hdr);
|
|
if (hdr->magic != RMODULE_MAGIC) {
|
|
debug("Invalid rmodule magic\n");
|
|
return -EINVAL;
|
|
}
|
|
if (hdr->module_link_start_address != 0) {
|
|
debug("Link start address must be 0\n");
|
|
return -EPERM;
|
|
}
|
|
if (hdr->module_entry_point != 0) {
|
|
debug("Entry point must be 0\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
memset(pei_data, '\0', sizeof(struct pei_data));
|
|
broadwell_fill_pei_data(pei_data);
|
|
mainboard_fill_pei_data(pei_data);
|
|
pei_data->saved_data = (void *)&dummy;
|
|
|
|
src = (char *)hdr + hdr->payload_begin_offset;
|
|
dest = (char *)CONFIG_X86_REFCODE_RUN_ADDR;
|
|
|
|
size = hdr->payload_end_offset - hdr->payload_begin_offset;
|
|
debug("Copying refcode from %p to %p, size %x\n", src, dest, size);
|
|
memcpy(dest, src, size);
|
|
|
|
size = hdr->bss_end - hdr->bss_begin;
|
|
debug("Zeroing BSS at %p, size %x\n", dest + hdr->bss_begin, size);
|
|
memset(dest + hdr->bss_begin, '\0', size);
|
|
|
|
func = (asmlinkage int (*)(void *))dest;
|
|
debug("Running reference code at %p\n", func);
|
|
#ifdef DEBUG
|
|
print_buffer(CONFIG_X86_REFCODE_RUN_ADDR, (void *)func, 1, 0x40, 0);
|
|
#endif
|
|
ret = func(pei_data);
|
|
if (ret != 0) {
|
|
debug("Reference code returned %d\n", ret);
|
|
return -EL2HLT;
|
|
}
|
|
debug("Refereence code completed\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int arch_early_init_r(void)
|
|
{
|
|
return cpu_run_reference_code();
|
|
}
|