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/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
*/
#ifndef _BAREBOX_ARM_H_
#define _BAREBOX_ARM_H_
#include <linux/sizes.h>
#include <asm-generic/memory_layout.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <asm/barebox-arm-head.h>
/*
* We have a 4GiB address space split into 1MiB sections, with each
* section header taking 4 bytes
*/
#define ARM_TTB_SIZE (SZ_4G / SZ_1M * sizeof(u32))
unsigned long get_runtime_offset(void);
/* global_variable_offset() - Access global variables when not running at link address
*
* Get the offset of global variables when not running at the address we are
* linked at. ARM uses absolute addresses, so we must add the runtime offset
* whereas aarch64 uses PC relative addresses, so nothing must be done here.
*/
static inline unsigned long global_variable_offset(void)
{
if (IS_ENABLED(CONFIG_CPU_32))
return get_runtime_offset();
else
return 0;
}
void setup_c(void);
void relocate_to_current_adr(void);
void relocate_to_adr(unsigned long target);
void __noreturn barebox_arm_entry(unsigned long membase, unsigned long memsize, void *boarddata);
struct barebox_arm_boarddata {
#define BAREBOX_ARM_BOARDDATA_MAGIC 0xabe742c3
u32 magic;
u32 machine; /* machine number to pass to barebox. This may or may
* not be a ARM machine number registered on arm.linux.org.uk.
* It must only be unique across barebox. Please use a number
* that do not potientially clashes with registered machines,
* i.e. use a number > 0x10000.
*/
};
/*
* Create a boarddata struct at given address. Suitable to be passed
* as boarddata to barebox_arm_entry(). The machine can be retrieved
* later with barebox_arm_machine().
*/
static inline void boarddata_create(void *adr, u32 machine)
{
struct barebox_arm_boarddata *bd = adr;
bd->magic = BAREBOX_ARM_BOARDDATA_MAGIC;
bd->machine = machine;
}
u32 barebox_arm_machine(void);
unsigned long arm_mem_ramoops_get(void);
struct barebox_arm_boarddata_compressed_dtb {
#define BAREBOX_ARM_BOARDDATA_COMPRESSED_DTB_MAGIC 0x7b66bcbd
u32 magic;
u32 datalen;
u32 datalen_uncompressed;
};
struct barebox_arm_boarddata *barebox_arm_get_boarddata(void);
#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_ARM_EXCEPTIONS)
void arm_fixup_vectors(void);
#else
static inline void arm_fixup_vectors(void)
{
}
#endif
void *barebox_arm_boot_dtb(void);
static inline unsigned long arm_mem_stack_top(unsigned long membase,
unsigned long endmem)
{
return endmem - SZ_64K;
}
static inline unsigned long arm_mem_stack(unsigned long membase,
unsigned long endmem)
{
return arm_mem_stack_top(membase, endmem) - STACK_SIZE;
}
static inline unsigned long arm_mem_ttb(unsigned long membase,
unsigned long endmem)
{
endmem = arm_mem_stack(membase, endmem);
endmem = ALIGN_DOWN(endmem, ARM_TTB_SIZE) - ARM_TTB_SIZE;
return endmem;
}
static inline unsigned long arm_mem_early_malloc(unsigned long membase,
unsigned long endmem)
{
return arm_mem_ttb(membase, endmem) - SZ_128K;
}
static inline unsigned long arm_mem_early_malloc_end(unsigned long membase,
unsigned long endmem)
{
return arm_mem_ttb(membase, endmem);
}
static inline unsigned long arm_mem_ramoops(unsigned long membase,
unsigned long endmem)
{
endmem = arm_mem_ttb(membase, endmem);
#ifdef CONFIG_FS_PSTORE_RAMOOPS
endmem -= CONFIG_FS_PSTORE_RAMOOPS_SIZE;
endmem = ALIGN_DOWN(endmem, SZ_4K);
#endif
return endmem;
}
static inline unsigned long arm_mem_barebox_image(unsigned long membase,
unsigned long endmem,
unsigned long size)
{
endmem = arm_mem_ramoops(membase, endmem);
if (IS_ENABLED(CONFIG_RELOCATABLE)) {
return ALIGN_DOWN(endmem - size, SZ_1M);
} else {
if (TEXT_BASE >= membase && TEXT_BASE < endmem)
return TEXT_BASE;
else
return endmem;
}
}
#define ENTRY_FUNCTION(name, arg0, arg1, arg2) \
void name (uint32_t r0, uint32_t r1, uint32_t r2); \
\
static void __##name(uint32_t, uint32_t, uint32_t); \
\
void NAKED __section(.text_head_entry_##name) name \
(uint32_t r0, uint32_t r1, uint32_t r2) \
{ \
__barebox_arm_head(); \
__##name(r0, r1, r2); \
} \
static void NAKED noinline __##name \
(uint32_t arg0, uint32_t arg1, uint32_t arg2)
/*
* When using compressed images in conjunction with relocatable images
* the PBL code must pick a suitable place where to uncompress the barebox
* image. For doing this the PBL code must know the size of the final
* image including the BSS segment. The BSS size is unknown to the PBL
* code, so define a maximum BSS size here.
*/
#define MAX_BSS_SIZE SZ_1M
#define barebox_image_size (__image_end - __image_start)
#ifdef CONFIG_CPU_32
#define NAKED __naked
#else
/*
* There is no naked support for aarch64, so do not rely on it.
* This basically means we must have a stack configured when a
* function with the naked attribute is entered. On nowadays hardware
* the ROM should have some basic stack already. If not, set one
* up before jumping into the barebox entry functions.
*/
#define NAKED
#endif
#endif /* _BAREBOX_ARM_H_ */
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