+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* 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__
#include <linux/compiler.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.
+ * There is no use in including this from ASM files.
* 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 containing 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
- * section 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
+ * llsym() - Access a 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!
*/
+#define llsym(_type, _name, _list) \
+ ((_type *)&_u_boot_list_2_##_list##_2_##_name)
/**
* ll_entry_declare() - Declare linker-generated array entry
* 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
+ * 3) 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,
- * };
+ *
+ * ::
+ *
+ * ll_entry_declare(struct my_sub_cmd, my_sub_cmd, cmd_sub) = {
+ * .x = 3,
+ * .y = 4,
+ * };
*/
#define ll_entry_declare(_type, _name, _list) \
_type _u_boot_list_2_##_list##_2_##_name __aligned(4) \
* This is like ll_entry_declare() but creates multiple entries. It should
* be assigned to an array.
*
- * ll_entry_declare_list(struct my_sub_cmd, my_sub_cmd, cmd_sub, cmd.sub) = {
- * { .x = 3, .y = 4 },
- * { .x = 8, .y = 2 },
- * { .x = 1, .y = 7 }
- * };
+ * ::
+ *
+ * ll_entry_declare_list(struct my_sub_cmd, my_sub_cmd, cmd_sub) = {
+ * { .x = 3, .y = 4 },
+ * { .x = 8, .y = 2 },
+ * { .x = 1, .y = 7 }
+ * };
*/
#define ll_entry_declare_list(_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
* @_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
+ * 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.
*
* 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);
+ *
+ * ::
+ *
+ * struct my_sub_cmd *msc = ll_entry_start(struct my_sub_cmd, cmd_sub);
*/
#define ll_entry_start(_type, _list) \
({ \
* @_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
+ * 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.
*
* 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);
+ *
+ * ::
+ *
+ * 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, \
+ static char end[0] __aligned(4) __attribute__((unused, \
section(".u_boot_list_2_"#_list"_3"))); \
(_type *)&end; \
})
* 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);
+ *
+ * ::
+ *
+ * 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) \
({ \
* @_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
+ * This function returns a pointer to a particular entry in linker-generated
+ * 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);
+ *
+ * ::
+ *
+ * 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; \
+ &_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
+ * 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);
+ *
+ * ::
+ *
+ * struct my_sub_cmd *msc = ll_start(struct my_sub_cmd);
*/
#define ll_start(_type) \
({ \
})
/**
- * ll_entry_end() - Point after last entry of last linker-generated array
+ * ll_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
+ * 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);
+ *
+ * ::
+ *
+ * struct my_sub_cmd *msc = ll_end(struct my_sub_cmd);
*/
#define ll_end(_type) \
({ \
- static char end[0] __aligned(4) __attribute__((unused, \
+ static char end[0] __aligned(4) __attribute__((unused, \
section(".u_boot_list_3"))); \
(_type *)&end; \
})
projects / oweals / u-boot.git / blobdiff