d26cf2dc33
Unline k_thread_spawn(), the struct k_thread can live anywhere and not in the thread's stack region. This will be useful for memory protection scenarios where private kernel structures for a thread are not accessible by that thread, or we want to allow the thread to use all the stack space we gave it. This requires a change to the internal _new_thread() API as we need to provide a separate pointer for the k_thread. By default, we still create internal threads with the k_thread in stack memory. Forthcoming patches will change this, but we first need to make it easier to define k_thread memory of variable size depending on whether we need to store coprocessor state or not. Change-Id: I533bbcf317833ba67a771b356b6bbc6596bf60f5 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/*
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* Copyright (c) 2013-2016 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Private kernel definitions (ARM)
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*
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* This file contains private kernel function definitions and various
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* other definitions for the ARM Cortex-M3 processor architecture.
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*
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* This file is also included by assembly language files which must #define
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* _ASMLANGUAGE before including this header file. Note that kernel
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* assembly source files obtains structure offset values via "absolute symbols"
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* in the offsets.o module.
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*/
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/* this file is only meant to be included by kernel_structs.h */
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#ifndef _kernel_arch_func__h_
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#define _kernel_arch_func__h_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _ASMLANGUAGE
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extern void _FaultInit(void);
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extern void _CpuIdleInit(void);
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static ALWAYS_INLINE void kernel_arch_init(void)
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{
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_InterruptStackSetup();
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_ExcSetup();
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_FaultInit();
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_CpuIdleInit();
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}
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static ALWAYS_INLINE void
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_arch_switch_to_main_thread(struct k_thread *main_thread, char *main_stack,
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size_t main_stack_size, _thread_entry_t _main)
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{
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/* get high address of the stack, i.e. its start (stack grows down) */
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char *start_of_main_stack;
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start_of_main_stack = main_stack + main_stack_size;
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start_of_main_stack = (void *)STACK_ROUND_DOWN(start_of_main_stack);
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_current = main_thread;
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/* the ready queue cache already contains the main thread */
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__asm__ __volatile__(
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/* move to main() thread stack */
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"msr PSP, %0 \t\n"
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/* unlock interrupts */
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#ifdef CONFIG_ARMV6_M
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"cpsie i \t\n"
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#elif defined(CONFIG_ARMV7_M)
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"movs %%r1, #0 \n\t"
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"msr BASEPRI, %%r1 \n\t"
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#else
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#error Unknown ARM architecture
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#endif /* CONFIG_ARMV6_M */
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/* branch to _thread_entry(_main, 0, 0, 0) */
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"mov %%r0, %1 \n\t"
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"bx %2 \t\n"
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/* never gets here */
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:
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: "r"(start_of_main_stack),
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"r"(_main), "r"(_thread_entry)
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: "r0", "r1", "sp"
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);
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CODE_UNREACHABLE;
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}
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static ALWAYS_INLINE void
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_set_thread_return_value(struct k_thread *thread, unsigned int value)
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{
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thread->arch.swap_return_value = value;
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}
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extern void k_cpu_atomic_idle(unsigned int key);
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#define _is_in_isr() _IsInIsr()
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extern void _IntLibInit(void);
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#endif /* _ASMLANGUAGE */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _kernel_arch_func__h_ */
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