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app_shmem: overhaul partition specification

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* K_APP_DMEM_SECTION/K_MEM_BMEM_SECTION macros now exist
  to specifically define the name of the sections for data
  and bss respectively.

* All boards now use the gen_app_partitions.py script, the
  padding hacks for non-power-of-two arches didn't work right
  in all cases. Linker scripts have been updated.

* The defined k_mem_partition is now completely initialized
  at build time. The region data structures now only exist
  to zero BSS.

Based on some work submitted by Adithya Baglody
<adithya.baglody@intel.com>

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-01-30 13:44:54 -08:00 • committed by Anas Nashif
commit 7adff462e7
6 changed files with 94 additions and 148 deletions
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98
include/app_memory/app_memdomain.h
View file

@ -13,26 +13,26 @@
#error "Not implemented for this architecture"
#endif
/*
* There has got to be a better way of doing this. This
* tries to ensure that a) each subsection has a
* data_smem_#id_b part and b) that each k_mem_partition
* matches the page size or MPU region. If there is no
* data_smem_#id_b subsection, then the size calculations
* will fail. Additionally, if each k_mem_partition does
* not match the page size or MPU region, then the
* partition will fail to be created.
* checkpatch.pl complains that __aligned(size) is
* preferred, but, if implemented, then complains about
* complex macro without parentheses.
*/
#define _app_dmem_pad(id) \
__attribute__((aligned(MEM_DOMAIN_ALIGN_SIZE), \
section("data_smem_" #id)))
#define _app_bmem_pad(id) \
__attribute__((aligned(MEM_DOMAIN_ALIGN_SIZE), \
section("data_smem_" #id "b")))
/**
* @brief Name of the data section for a particular partition
*
* Useful for defining memory pools, or any other macro that takes a
* section name as a parameter.
*
* @param id Partition name
*/
#define K_APP_DMEM_SECTION(id) data_smem_##id##_data
/**
* @brief Name of the bss section for a particular partition
*
* Useful for defining memory pools, or any other macro that takes a
* section name as a parameter.
*
* @param id Partition name
*/
#define K_APP_BMEM_SECTION(id) data_smem_##id##_bss
/**
* @brief Place data in a partition's data section
@ -43,8 +43,7 @@
*
* @param id Name of the memory partition to associate this data
*/
#define K_APP_DMEM(id) \
__attribute__((section("data_smem_" #id)))
#define K_APP_DMEM(id) _GENERIC_SECTION(K_APP_DMEM_SECTION(id))
/**
* @brief Place data in a partition's bss section
@ -54,35 +53,17 @@
*
* @param id Name of the memory partition to associate this data
*/
#define K_APP_BMEM(id) \
__attribute__((section("data_smem_" #id "b")))
#define K_APP_BMEM(id) _GENERIC_SECTION(K_APP_BMEM_SECTION(id))
/*
* Creation of a struct to save start addresses, sizes, and
* a pointer to a k_mem_partition. It also adds a linked
* list node.
*/
struct app_region {
char *dmem_start;
char *bmem_start;
u32_t smem_size;
struct k_mem_partition *partition;
struct z_app_region {
void *bss_start;
size_t bss_size;
};
/*
* Declares a partition and provides a function to add the
* partition to the linked list and initialize the partition.
*/
#ifdef CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
/* For power of 2 MPUs linker provides support to help us
* calculate the region sizes.
*/
#define smem_size_declare(name) extern char data_smem_##name##_size[]
#define smem_size_val(name) ((u32_t)&data_smem_##name##_size)
#else
#define smem_size_declare(name)
#define smem_size_val(name) 0
#endif /* CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT */
#define Z_APP_START(id) data_smem_##id##_start
#define Z_APP_SIZE(id) data_smem_##id##_size
#define Z_APP_BSS_START(id) data_smem_##id##_bss_start
#define Z_APP_BSS_SIZE(id) data_smem_##id##_bss_size
/**
* @brief Define an application memory partition with linker support
@ -97,21 +78,20 @@ struct app_region {
* @param name Name of the k_mem_partition to declare
*/
#define K_APPMEM_PARTITION_DEFINE(name) \
extern char *data_smem_##name; \
extern char *data_smem_##name##b; \
smem_size_declare(name); \
_app_dmem_pad(name) char name##_dmem_pad; \
_app_bmem_pad(name) char name##_bmem_pad; \
extern char Z_APP_START(name)[]; \
extern char Z_APP_SIZE(name)[]; \
struct k_mem_partition name = { \
.start = (u32_t) &data_smem_##name, \
.start = (u32_t) &Z_APP_START(name), \
.size = (u32_t) &Z_APP_SIZE(name), \
.attr = K_MEM_PARTITION_P_RW_U_RW \
}; \
extern char Z_APP_BSS_START(name)[]; \
extern char Z_APP_BSS_SIZE(name)[]; \
_GENERIC_SECTION(.app_regions.name) \
struct app_region name##_region = { \
.dmem_start = (char *)&data_smem_##name, \
.bmem_start = (char *)&data_smem_##name##b, \
.smem_size = smem_size_val(name), \
.partition = &name \
};
struct z_app_region name##_region = { \
.bss_start = &Z_APP_BSS_START(name), \
.bss_size = (size_t) &Z_APP_BSS_SIZE(name) \
}; \
K_APP_BMEM(name) char name##_placeholder;
#endif /* ZEPHYR_INCLUDE_APP_MEMORY_APP_MEMDOMAIN_H_ */

16
include/arch/arc/v2/linker.ld
View file

@ -139,22 +139,12 @@ SECTIONS {
#include <app_data_alignment.ld>
#if defined(CONFIG_APP_SHARED_MEM)
#if defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define APP_SHARED_ALIGN MPU_MIN_SIZE_ALIGN
#include <app_smem.ld>
#else
SECTION_PROLOGUE(_APP_SMEM_SECTION_NAME, (OPTIONAL),)
{
MPU_MIN_SIZE_ALIGN
_image_ram_start = .;
_app_smem_start = .;
APP_SMEM_SECTION()
MPU_MIN_SIZE_ALIGN
_app_smem_end = .;
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
#define SMEM_PARTITION_ALIGN MPU_ALIGN
#endif /* CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT */
#include <app_smem.ld>
_image_ram_start = _app_smem_start;
_app_smem_size = _app_smem_end - _app_smem_start;
_app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME);
#endif /* CONFIG_APP_SHARED_MEM */

17
include/arch/arm/cortex_m/scripts/linker.ld
View file

@ -411,22 +411,9 @@ SECTIONS
#if defined(CONFIG_APP_SHARED_MEM)
#define APP_SHARED_ALIGN . = ALIGN(_region_min_align);
#if defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#include <app_smem.ld>
#else
SECTION_PROLOGUE(_APP_SMEM_SECTION_NAME, (OPTIONAL),)
{
APP_SHARED_ALIGN;
_app_smem_start = .;
APP_SMEM_SECTION()
/* Align the end of shared app mem section with the
* minimum granularity required by MPU.
*/
APP_SHARED_ALIGN;
_app_smem_end = .;
#define SMEM_PARTITION_ALIGN MPU_ALIGN
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
#endif /* CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT */
#include <app_smem.ld>
_app_smem_size = _app_smem_end - _app_smem_start;
_app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME);

24
include/arch/x86/linker.ld
View file

@ -203,26 +203,28 @@ SECTIONS
__gcov_bss_size = __gcov_bss_end - __gcov_bss_start;
#endif /* CONFIG_COVERAGE_GCOV */
#ifdef CONFIG_APP_SHARED_MEM
/* APP SHARED MEMORY REGION */
SECTION_PROLOGUE(_APP_SMEM_SECTION_NAME, (OPTIONAL),)
{
_image_ram_start = .;
_app_smem_start = .;
APP_SMEM_SECTION()
MMU_PAGE_ALIGN
_app_smem_end = .;
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)
#define SMEM_PARTITION_ALIGN(size) MMU_PAGE_ALIGN
#define APP_SHARED_ALIGN MMU_PAGE_ALIGN
#include <app_smem.ld>
_image_ram_start = _app_smem_start;
_app_smem_size = _app_smem_end - _app_smem_start;
_app_smem_num_words = _app_smem_size >> 2;
_app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME);
_app_smem_num_words = _app_smem_size >> 2;
#endif /* CONFIG_APP_SHARED_MEM */
#ifdef CONFIG_APPLICATION_MEMORY
SECTION_DATA_PROLOGUE(_APP_DATA_SECTION_NAME, (OPTIONAL),)
{
#ifndef CONFIG_XIP
MMU_PAGE_ALIGN
#endif
#if !defined(CONFIG_APP_SHARED_MEM)
_image_ram_start = .;
#endif
__app_ram_start = .;
__app_data_ram_start = .;
@ -258,7 +260,9 @@ SECTIONS
SECTION_PROLOGUE(_BSS_SECTION_NAME, (NOLOAD OPTIONAL),)
{
MMU_PAGE_ALIGN
#if !defined(CONFIG_APP_SHARED_MEM) && !defined(CONFIG_APPLICATION_MEMORY)
_image_ram_start = .;
#endif
/*
* For performance, BSS section is forced to be both 4 byte aligned and
* a multiple of 4 bytes.

56
scripts/gen_app_partitions.py
View file

@ -13,15 +13,20 @@ from elf_helper import ElfHelper
from elftools.elf.elffile import ELFFile
# This script will create linker comands for power of two aligned MPU
# when APP_SHARED_MEM is enabled.
# This script will create sections and linker variables to place the
# application shared memory partitions.
# these are later read by the macros defined in app_memdomain.h for
# initialization purpose when APP_SHARED_MEM is enabled.
print_template = """
/* Auto generated code do not modify */
MPU_ALIGN(data_smem_{0}b_end - data_smem_{0});
data_smem_{0} = .;
KEEP(*(SORT(data_smem_{0}*)))
MPU_ALIGN(data_smem_{0}b_end - data_smem_{0});
data_smem_{0}b_end = .;
SMEM_PARTITION_ALIGN(data_smem_{0}_bss_end - data_smem_{0}_start);
data_smem_{0}_start = .;
KEEP(*(data_smem_{0}_data))
data_smem_{0}_bss_start = .;
KEEP(*(data_smem_{0}_bss))
SMEM_PARTITION_ALIGN(data_smem_{0}_bss_end - data_smem_{0}_start);
data_smem_{0}_bss_end = .;
data_smem_{0}_end = .;
"""
linker_start_seq = """
SECTION_PROLOGUE(_APP_SMEM_SECTION_NAME, (OPTIONAL),)
@ -31,15 +36,17 @@ linker_start_seq = """
"""
linker_end_seq = """
_app_smem_end = .;
APP_SHARED_ALIGN;
_app_smem_end = .;
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
"""
size_cal_string = """
data_smem_{0}_size = data_smem_{0}b_end - data_smem_{0};
data_smem_{0}_size = data_smem_{0}_end - data_smem_{0}_start;
data_smem_{0}_bss_size = data_smem_{0}_bss_end - data_smem_{0}_bss_start;
"""
section_regex = re.compile(r'data_smem_([A-Za-z0-9_]*)_(data|bss)')
def find_partitions(filename, full_list_of_partitions, partitions_source_file):
with open(filename, 'rb') as f:
@ -48,22 +55,19 @@ def find_partitions(filename, full_list_of_partitions, partitions_source_file):
print("Error parsing file: ",filename)
os.exit(1)
sections = [ x for x in full_lib.iter_sections()]
sections = [x for x in full_lib.iter_sections()]
for section in sections:
if ("smem" in section.name and not ".rel" in section.name):
partition_name = section.name.split("data_smem_")[1]
if partition_name not in full_list_of_partitions:
full_list_of_partitions.append(partition_name)
if args.verbose:
partitions_source_file.update({partition_name: filename})
m = section_regex.match(section.name)
if not m:
continue
partition_name = m.groups()[0]
if partition_name not in full_list_of_partitions:
full_list_of_partitions.append(partition_name)
if args.verbose:
partitions_source_file.update({partition_name: filename})
return( full_list_of_partitions, partitions_source_file)
def cleanup_remove_bss_regions(full_list_of_partitions):
for partition in full_list_of_partitions:
if (partition+"b" in full_list_of_partitions):
full_list_of_partitions.remove(partition+"b")
return full_list_of_partitions
return (full_list_of_partitions, partitions_source_file)
def generate_final_linker(linker_file, full_list_of_partitions):
string = linker_start_seq
@ -105,11 +109,11 @@ def main():
fullname = os.path.join(dirpath, filename)
full_list_of_partitions, partitions_source_file = find_partitions(fullname, full_list_of_partitions, partitions_source_file)
full_list_of_partitions = cleanup_remove_bss_regions(full_list_of_partitions)
generate_final_linker(linker_file, full_list_of_partitions)
if args.verbose:
print("Partitions retrieved: PARTITION, FILENAME")
print([key + " "+ partitions_source_file[key] for key in full_list_of_partitions])
print("Partitions retrieved:")
for key in full_list_of_partitions:
print(" %s: %s\n", key, partitions_source_file[key])
if __name__ == '__main__':
main()

31
subsys/app_memory/app_memdomain.c
View file

@ -7,37 +7,18 @@
extern char __app_shmem_regions_start[];
extern char __app_shmem_regions_end[];
static int app_shmem_setup(struct device *unused)
static int app_shmem_bss_zero(struct device *unused)
{
struct app_region *region, *end;
size_t bss_size, data_size;
struct z_app_region *region, *end;
end = (struct app_region *)&__app_shmem_regions_end;
region = (struct app_region *)&__app_shmem_regions_start;
end = (struct z_app_region *)&__app_shmem_regions_end;
region = (struct z_app_region *)&__app_shmem_regions_start;
for ( ; region < end; region++) {
/* Determine bounds and set partition appropriately */
#ifndef CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
data_size = region->bmem_start - region->dmem_start;
if (region == end - 1) {
bss_size = _app_smem_end - region->bmem_start;
} else {
struct app_region *next = region + 1;
__ASSERT_NO_MSG(region->bmem_start < next->dmem_start);
bss_size = next->dmem_start - region->bmem_start;
}
#else
data_size = region->bmem_start - region->dmem_start;
bss_size = region->smem_size - data_size;
#endif
region->partition->size = data_size + bss_size;
/* Zero out BSS area of each partition */
(void)memset(region->bmem_start, 0, bss_size);
(void)memset(region->bss_start, 0, region->bss_size);
}
return 0;
}
SYS_INIT(app_shmem_setup, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
SYS_INIT(app_shmem_bss_zero, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);