X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Finclude%2Flinker_lists.h;fp=qemu%2Froms%2Fu-boot%2Finclude%2Flinker_lists.h;h=557e6273adb391133d2cd5dc06695f69060ca732;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git diff --git a/qemu/roms/u-boot/include/linker_lists.h b/qemu/roms/u-boot/include/linker_lists.h new file mode 100644 index 000000000..557e6273a --- /dev/null +++ b/qemu/roms/u-boot/include/linker_lists.h @@ -0,0 +1,288 @@ +/* + * include/linker_lists.h + * + * Implementation of linker-generated arrays + * + * Copyright (C) 2012 Marek Vasut + * + * 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__ */