upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
288 lines
9.7 KiB
288 lines
9.7 KiB
/*
|
|
* include/linker_lists.h
|
|
*
|
|
* Implementation of linker-generated arrays
|
|
*
|
|
* Copyright (C) 2012 Marek Vasut <marex@denx.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef __LINKER_LISTS_H__
|
|
#define __LINKER_LISTS_H__
|
|
|
|
/*
|
|
* There is no use in including this from ASM files, but that happens
|
|
* anyway, e.g. PPC kgdb.S includes command.h which incluse us.
|
|
* So just don't define anything when included from ASM.
|
|
*/
|
|
|
|
#if !defined(__ASSEMBLY__)
|
|
|
|
/**
|
|
* A linker list is constructed by grouping together linker input
|
|
* sections, each containning one entry of the list. Each input section
|
|
* contains a constant initialized variable which holds the entry's
|
|
* content. Linker list input sections are constructed from the list
|
|
* and entry names, plus a prefix which allows grouping all lists
|
|
* together. Assuming _list and _entry are the list and entry names,
|
|
* then the corresponding input section name is
|
|
*
|
|
* _u_boot_list + _2_ + @_list + _2_ + @_entry
|
|
*
|
|
* and the C variable name is
|
|
*
|
|
* .u_boot_list_ + 2_ + @_list + _2_ + @_entry
|
|
*
|
|
* This ensures uniqueness for both input section and C variable name.
|
|
*
|
|
* Note that the names differ only in the first character, "." for the
|
|
* setion and "_" for the variable, so that the linker cannot confuse
|
|
* section and symbol names. From now on, both names will be referred
|
|
* to as
|
|
*
|
|
* %u_boot_list_ + 2_ + @_list + _2_ + @_entry
|
|
*
|
|
* Entry variables need never be referred to directly.
|
|
*
|
|
* The naming scheme for input sections allows grouping all linker lists
|
|
* into a single linker output section and grouping all entries for a
|
|
* single list.
|
|
*
|
|
* Note the two '_2_' constant components in the names: their presence
|
|
* allows putting a start and end symbols around a list, by mapping
|
|
* these symbols to sections names with components "1" (before) and
|
|
* "3" (after) instead of "2" (within).
|
|
* Start and end symbols for a list can generally be defined as
|
|
*
|
|
* %u_boot_list_2_ + @_list + _1_...
|
|
* %u_boot_list_2_ + @_list + _3_...
|
|
*
|
|
* Start and end symbols for the whole of the linker lists area can be
|
|
* defined as
|
|
*
|
|
* %u_boot_list_1_...
|
|
* %u_boot_list_3_...
|
|
*
|
|
* Here is an example of the sorted sections which result from a list
|
|
* "array" made up of three entries : "first", "second" and "third",
|
|
* iterated at least once.
|
|
*
|
|
* .u_boot_list_2_array_1
|
|
* .u_boot_list_2_array_2_first
|
|
* .u_boot_list_2_array_2_second
|
|
* .u_boot_list_2_array_2_third
|
|
* .u_boot_list_2_array_3
|
|
*
|
|
* If lists must be divided into sublists (e.g. for iterating only on
|
|
* part of a list), one can simply give the list a name of the form
|
|
* 'outer_2_inner', where 'outer' is the global list name and 'inner'
|
|
* is the sub-list name. Iterators for the whole list should use the
|
|
* global list name ("outer"); iterators for only a sub-list should use
|
|
* the full sub-list name ("outer_2_inner").
|
|
*
|
|
* Here is an example of the sections generated from a global list
|
|
* named "drivers", two sub-lists named "i2c" and "pci", and iterators
|
|
* defined for the whole list and each sub-list:
|
|
*
|
|
* %u_boot_list_2_drivers_1
|
|
* %u_boot_list_2_drivers_2_i2c_1
|
|
* %u_boot_list_2_drivers_2_i2c_2_first
|
|
* %u_boot_list_2_drivers_2_i2c_2_first
|
|
* %u_boot_list_2_drivers_2_i2c_2_second
|
|
* %u_boot_list_2_drivers_2_i2c_2_third
|
|
* %u_boot_list_2_drivers_2_i2c_3
|
|
* %u_boot_list_2_drivers_2_pci_1
|
|
* %u_boot_list_2_drivers_2_pci_2_first
|
|
* %u_boot_list_2_drivers_2_pci_2_second
|
|
* %u_boot_list_2_drivers_2_pci_2_third
|
|
* %u_boot_list_2_drivers_2_pci_3
|
|
* %u_boot_list_2_drivers_3
|
|
*/
|
|
|
|
/**
|
|
* ll_entry_declare() - Declare linker-generated array entry
|
|
* @_type: Data type of the entry
|
|
* @_name: Name of the entry
|
|
* @_list: name of the list. Should contain only characters allowed
|
|
* in a C variable name!
|
|
*
|
|
* This macro declares a variable that is placed into a linker-generated
|
|
* array. This is a basic building block for more advanced use of linker-
|
|
* generated arrays. The user is expected to build their own macro wrapper
|
|
* around this one.
|
|
*
|
|
* A variable declared using this macro must be compile-time initialized.
|
|
*
|
|
* Special precaution must be made when using this macro:
|
|
*
|
|
* 1) The _type must not contain the "static" keyword, otherwise the
|
|
* entry is generated and can be iterated but is listed in the map
|
|
* file and cannot be retrieved by name.
|
|
*
|
|
* 2) In case a section is declared that contains some array elements AND
|
|
* a subsection of this section is declared and contains some elements,
|
|
* it is imperative that the elements are of the same type.
|
|
*
|
|
* 4) In case an outer section is declared that contains some array elements
|
|
* AND an inner subsection of this section is declared and contains some
|
|
* elements, then when traversing the outer section, even the elements of
|
|
* the inner sections are present in the array.
|
|
*
|
|
* Example:
|
|
* ll_entry_declare(struct my_sub_cmd, my_sub_cmd, cmd_sub, cmd.sub) = {
|
|
* .x = 3,
|
|
* .y = 4,
|
|
* };
|
|
*/
|
|
#define ll_entry_declare(_type, _name, _list) \
|
|
_type _u_boot_list_2_##_list##_2_##_name __aligned(4) \
|
|
__attribute__((unused, \
|
|
section(".u_boot_list_2_"#_list"_2_"#_name)))
|
|
|
|
/**
|
|
* We need a 0-byte-size type for iterator symbols, and the compiler
|
|
* does not allow defining objects of C type 'void'. Using an empty
|
|
* struct is allowed by the compiler, but causes gcc versions 4.4 and
|
|
* below to complain about aliasing. Therefore we use the next best
|
|
* thing: zero-sized arrays, which are both 0-byte-size and exempt from
|
|
* aliasing warnings.
|
|
*/
|
|
|
|
/**
|
|
* ll_entry_start() - Point to first entry of linker-generated array
|
|
* @_type: Data type of the entry
|
|
* @_list: Name of the list in which this entry is placed
|
|
*
|
|
* This function returns (_type *) pointer to the very first entry of a
|
|
* linker-generated array placed into subsection of .u_boot_list section
|
|
* specified by _list argument.
|
|
*
|
|
* Since this macro defines an array start symbol, its leftmost index
|
|
* must be 2 and its rightmost index must be 1.
|
|
*
|
|
* Example:
|
|
* struct my_sub_cmd *msc = ll_entry_start(struct my_sub_cmd, cmd_sub);
|
|
*/
|
|
#define ll_entry_start(_type, _list) \
|
|
({ \
|
|
static char start[0] __aligned(4) __attribute__((unused, \
|
|
section(".u_boot_list_2_"#_list"_1"))); \
|
|
(_type *)&start; \
|
|
})
|
|
|
|
/**
|
|
* ll_entry_end() - Point after last entry of linker-generated array
|
|
* @_type: Data type of the entry
|
|
* @_list: Name of the list in which this entry is placed
|
|
* (with underscores instead of dots)
|
|
*
|
|
* This function returns (_type *) pointer after the very last entry of
|
|
* a linker-generated array placed into subsection of .u_boot_list
|
|
* section specified by _list argument.
|
|
*
|
|
* Since this macro defines an array end symbol, its leftmost index
|
|
* must be 2 and its rightmost index must be 3.
|
|
*
|
|
* Example:
|
|
* struct my_sub_cmd *msc = ll_entry_end(struct my_sub_cmd, cmd_sub);
|
|
*/
|
|
#define ll_entry_end(_type, _list) \
|
|
({ \
|
|
static char end[0] __aligned(4) __attribute__((unused, \
|
|
section(".u_boot_list_2_"#_list"_3"))); \
|
|
(_type *)&end; \
|
|
})
|
|
/**
|
|
* ll_entry_count() - Return the number of elements in linker-generated array
|
|
* @_type: Data type of the entry
|
|
* @_list: Name of the list of which the number of elements is computed
|
|
*
|
|
* This function returns the number of elements of a linker-generated array
|
|
* placed into subsection of .u_boot_list section specified by _list
|
|
* argument. The result is of an unsigned int type.
|
|
*
|
|
* Example:
|
|
* int i;
|
|
* const unsigned int count = ll_entry_count(struct my_sub_cmd, cmd_sub);
|
|
* struct my_sub_cmd *msc = ll_entry_start(struct my_sub_cmd, cmd_sub);
|
|
* for (i = 0; i < count; i++, msc++)
|
|
* printf("Entry %i, x=%i y=%i\n", i, msc->x, msc->y);
|
|
*/
|
|
#define ll_entry_count(_type, _list) \
|
|
({ \
|
|
_type *start = ll_entry_start(_type, _list); \
|
|
_type *end = ll_entry_end(_type, _list); \
|
|
unsigned int _ll_result = end - start; \
|
|
_ll_result; \
|
|
})
|
|
|
|
/**
|
|
* ll_entry_get() - Retrieve entry from linker-generated array by name
|
|
* @_type: Data type of the entry
|
|
* @_name: Name of the entry
|
|
* @_list: Name of the list in which this entry is placed
|
|
*
|
|
* This function returns a pointer to a particular entry in LG-array
|
|
* identified by the subsection of u_boot_list where the entry resides
|
|
* and it's name.
|
|
*
|
|
* Example:
|
|
* ll_entry_declare(struct my_sub_cmd, my_sub_cmd, cmd_sub) = {
|
|
* .x = 3,
|
|
* .y = 4,
|
|
* };
|
|
* ...
|
|
* struct my_sub_cmd *c = ll_entry_get(struct my_sub_cmd, my_sub_cmd, cmd_sub);
|
|
*/
|
|
#define ll_entry_get(_type, _name, _list) \
|
|
({ \
|
|
extern _type _u_boot_list_2_##_list##_2_##_name; \
|
|
_type *_ll_result = \
|
|
&_u_boot_list_2_##_list##_2_##_name; \
|
|
_ll_result; \
|
|
})
|
|
|
|
/**
|
|
* ll_start() - Point to first entry of first linker-generated array
|
|
* @_type: Data type of the entry
|
|
*
|
|
* This function returns (_type *) pointer to the very first entry of
|
|
* the very first linker-generated array.
|
|
*
|
|
* Since this macro defines the start of the linker-generated arrays,
|
|
* its leftmost index must be 1.
|
|
*
|
|
* Example:
|
|
* struct my_sub_cmd *msc = ll_start(struct my_sub_cmd);
|
|
*/
|
|
#define ll_start(_type) \
|
|
({ \
|
|
static char start[0] __aligned(4) __attribute__((unused, \
|
|
section(".u_boot_list_1"))); \
|
|
(_type *)&start; \
|
|
})
|
|
|
|
/**
|
|
* ll_entry_end() - Point after last entry of last linker-generated array
|
|
* @_type: Data type of the entry
|
|
*
|
|
* This function returns (_type *) pointer after the very last entry of
|
|
* the very last linker-generated array.
|
|
*
|
|
* Since this macro defines the end of the linker-generated arrays,
|
|
* its leftmost index must be 3.
|
|
*
|
|
* Example:
|
|
* struct my_sub_cmd *msc = ll_end(struct my_sub_cmd);
|
|
*/
|
|
#define ll_end(_type) \
|
|
({ \
|
|
static char end[0] __aligned(4) __attribute__((unused, \
|
|
section(".u_boot_list_3"))); \
|
|
(_type *)&end; \
|
|
})
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* __LINKER_LISTS_H__ */
|
|
|