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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc.
* Copyright (C) 2014 Imagination Technologies
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#ifndef PROGRAM_LOADING_H
#define PROGRAM_LOADING_H
#include <stdint.h>
#include <stddef.h>
enum {
/* Last segment of program. Can be used to take different actions for
* cache maintenance of a program load. */
SEG_FINAL = 1 << 0,
};
/* Called for each segment of a program loaded. The SEG_FINAL flag will be
* set on the last segment loaded. */
void arch_segment_loaded(uintptr_t start, size_t size, int flags);
struct buffer_area {
void *data;
size_t size;
};
enum prog_type {
PROG_VERSTAGE,
PROG_ROMSTAGE,
PROG_RAMSTAGE,
PROG_PAYLOAD,
};
/* Representation of a program. */
struct prog {
enum prog_type type;
const char *name;
/* The area can mean different things depending on what type the
* program is. e.g. a payload prog uses this field for the backing
* store of the payload_segments and data. After loading the segments
* area is updated to reflect the bounce buffer used. */
struct buffer_area area;
/* Entry to program with optional argument. It's up to the architecture
* to decide if argument is passed. */
void (*entry)(void *);
void *arg;
};
static inline size_t prog_size(const struct prog *prog)
{
return prog->area.size;
}
static inline void *prog_start(const struct prog *prog)
{
return prog->area.data;
}
static inline void *prog_entry(const struct prog *prog)
{
return prog->entry;
}
static inline void *prog_entry_arg(const struct prog *prog)
{
return prog->arg;
}
static inline void prog_set_area(struct prog *prog, void *start, size_t size)
{
prog->area.data = start;
prog->area.size = size;
}
static inline void prog_set_entry(struct prog *prog, void *e, void *arg)
{
prog->entry = e;
prog->arg = arg;
}
/* Run the program described by prog. */
void prog_run(struct prog *prog);
/* Per architecture implementation running a program. */
void arch_prog_run(struct prog *prog);
/* Platform (SoC/chipset) specific overrides for running a program. This is
* called prior to calling the arch_prog_run. Thus, if there is anything
* special that needs to be done by the platform similar to the architecture
* code it needs to that as well. */
void platform_prog_run(struct prog *prog);
struct prog_loader_ops {
const char *name;
/* Determine if the loader is the active one. If so returns 1 else 0
* or < 0 on error. */
int (*is_loader_active)(struct prog *prog);
/* Returns < 0 on error or 0 on success. This function needs to do
* different things depending on the prog type. See definition
* of struct prog above. */
int (*prepare)(struct prog *prog);
};
/************************
* ROMSTAGE LOADING *
************************/
/* Run romstage from bootblock. */
void run_romstage(void);
/************************
* RAMSTAGE LOADING *
************************/
/* Run ramstage from romstage. */
void run_ramstage(void);
/* Called when the stage cache couldn't load ramstage on resume. */
void ramstage_cache_invalid(void);
/***********************
* PAYLOAD LOADING *
***********************/
/* Load payload into memory in preparation to run. */
void payload_load(void);
/* Run the loaded payload. */
void payload_run(void);
/* Mirror the payload to be loaded. */
void mirror_payload(struct prog *payload);
/* Defined in src/lib/selfboot.c */
void *selfload(struct prog *payload);
#endif /* PROGRAM_LOADING_H */
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