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ARMv8 Trusted Firmware release v0.2

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Achin Gupta 2013-10-25 09:08:21 +01:00 • committed by James Morrissey
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/*
* Copyright (c) 2013, ARM Limited. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __BL_COMMON_H__
#define __BL_COMMON_H__
#define SECURE 0
#define NON_SECURE 1
#define UP 1
#define DOWN 0
/*******************************************************************************
* Constants for loading images. When BLx wants to load BLy, it looks at a
* meminfo structure to find the extents of free memory. Then depending upon
* how it has been configured, it can either load BLy at the top or bottom of
* the free memory. These constants indicate the choice.
* TODO: Make this configurable while building the trusted firmware.
******************************************************************************/
#define TOP_LOAD 0x1
#define BOT_LOAD !TOP_LOAD
#define LOAD_MASK (1 << 0)
/*******************************************************************************
* Size of memory for sharing data while changing exception levels.
*
* There are 2 cases where this memory buffer is used:
*
* - when BL1 (running in EL3) passes control to BL2 (running in S-EL1).
* BL1 needs to pass the memory layout to BL2, to allow BL2 to find out
* how much free trusted ram remains;
*
* - when BL2 (running in S-EL1) passes control back to BL1 (running in EL3)
* to make it run BL31. BL2 needs to pass the memory layout, as well as
* information on how to pass control to the non-trusted software image.
******************************************************************************/
#define EL_CHANGE_MEM_SIZE (sizeof(meminfo) + sizeof(el_change_info))
#ifndef __ASSEMBLY__
/*******************************************************************************
* Structure used for telling the next BL how much of a particular type of
* memory is available for its use and how much is already used.
******************************************************************************/
typedef struct {
unsigned long total_base;
long total_size;
unsigned long free_base;
long free_size;
unsigned long attr;
unsigned long next;
} meminfo;
typedef struct {
unsigned long arg0;
unsigned long arg1;
unsigned long arg2;
unsigned long arg3;
unsigned long arg4;
unsigned long arg5;
unsigned long arg6;
unsigned long arg7;
} aapcs64_params;
/*******************************************************************************
* This structure represents the superset of information needed while switching
* exception levels. The only two mechanisms to do so are ERET & SMC. In case of
* SMC all members apart from 'aapcs64_params' will be ignored. The 'next'
* member is a placeholder for a complicated case in the distant future when BL2
* will load multiple BL3x images as well as a non-secure image. So multiple
* such structures will have to be passed to BL31 in S-EL3.
******************************************************************************/
typedef struct {
unsigned long entrypoint;
unsigned long spsr;
unsigned long security_state;
aapcs64_params args;
unsigned long next;
} el_change_info;
/*******************************************************************************
* Function & variable prototypes
******************************************************************************/
extern unsigned long page_align(unsigned long, unsigned);
extern void change_security_state(unsigned int);
extern int drop_el(aapcs64_params *, unsigned long, unsigned long);
extern long raise_el(aapcs64_params *);
extern long change_el(el_change_info *);
extern unsigned long make_spsr(unsigned long, unsigned long, unsigned long);
extern void init_bl2_mem_layout(meminfo *,
meminfo *,
unsigned int,
unsigned long) __attribute__((weak));
extern void init_bl31_mem_layout(const meminfo *,
meminfo *,
unsigned int) __attribute__((weak));
extern unsigned long load_image(meminfo *, const char *, unsigned int, unsigned long);
extern int run_image(unsigned long,
unsigned long,
unsigned long,
meminfo *,
void *);
extern unsigned long *get_el_change_mem_ptr(void);
#endif /*__ASSEMBLY__*/
#endif /* __BL_COMMON_H__ */