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init: Support fine-grained device initialization priorities

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Introduces the SYS_DEFINE_DEVICE() macro, which supports 5 distinct
levels of device initialization and 100 priorities within each level.

Note: The existing init macros (e.g. nano_early_init()) have been
adapted to utilize the enhanced initialization model, but will
eventually be retired.

Change-Id: If677029d8b711a3fae9b2f32b5470cd97d19aeda
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
This commit is contained in:
Allan Stephens 2015-10-14 11:17:20 -04:00 • committed by Anas Nashif
commit a860cb7bff
8 changed files with 139 additions and 171 deletions
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30
include/linker-defs.h
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@ -42,6 +42,33 @@ This file may be included by:
#endif
#ifdef _LINKER
/*
* generate a symbol to mark the start of the device initialization objects for
* the specified level, then link all of those objects (sorted by priority);
* ensure the objects aren't discarded if there is no direct reference to them
*/
#define DEVICE_INIT_LEVEL(level) \
__device_##level##_start = .; \
KEEP(*(SORT(.init_##level[0-9]))); \
KEEP(*(SORT(.init_##level[1-9][0-9]))); \
/*
* link in device initialization objects for all devices that are automatically
* initialized by the kernel; the objects are sorted in the order they will be
* initialized (i.e. ordered by level, sorted by priority within a level)
*/
#define DEVICE_INIT_SECTIONS() \
__device_init_start = .; \
DEVICE_INIT_LEVEL(PRIMARY) \
DEVICE_INIT_LEVEL(SECONDARY) \
DEVICE_INIT_LEVEL(NANOKERNEL) \
DEVICE_INIT_LEVEL(MICROKERNEL) \
DEVICE_INIT_LEVEL(APPLICATION) \
__device_init_end = .; \
#ifdef CONFIG_X86_32 /* LINKER FILES: defines used by linker script */
/* Should be moved to linker-common-defs.h */
#if defined(CONFIG_XIP)
@ -63,6 +90,7 @@ This file may be included by:
#endif
#elif defined(_ASMLANGUAGE)
/* Assembly FILES: declaration defined by the linker script */
GDATA(__bss_start)
GDATA(__bss_num_words)
@ -72,7 +100,7 @@ GDATA(__data_ram_start)
GDATA(__data_num_words)
#endif
#else
#else /* ! _ASMLANGUAGE */
#include <stdint.h>
extern char __bss_start[];