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https://github.com/zephyrproject-rtos/zephyr
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f955476559
Some thread fields were 32-bit wide, when they are not even close to using that full range of values. They are instead changed to 8-bit fields. - prio can fit in one byte, limiting the priorities range to -128 to 127 - recursive scheduler locking can be limited to 255; a rollover results most probably from a logic error - flags are split into execution flags and thread states; 8 bits is enough for each of them currently, with at worst two states and four flags to spare (on x86, on other archs, there are six flags to spare) Doing this saves 8 bytes per stack. It also sets up an incoming enhancement when checking if the current thread is preemptible on interrupt exit. Change-Id: Ieb5321a5b99f99173b0605dd4a193c3bc7ddabf4 Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* Copyright (c) 2013-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <device.h>
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#ifndef _kernel_offsets__h_
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#define _kernel_offsets__h_
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/*
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* The final link step uses the symbol _OffsetAbsSyms to force the linkage of
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* offsets.o into the ELF image.
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*/
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GEN_ABS_SYM_BEGIN(_OffsetAbsSyms)
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GEN_OFFSET_SYM(_kernel_t, current);
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#if defined(CONFIG_THREAD_MONITOR)
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GEN_OFFSET_SYM(_kernel_t, threads);
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#endif
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GEN_OFFSET_SYM(_kernel_t, nested);
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GEN_OFFSET_SYM(_kernel_t, irq_stack);
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#ifdef CONFIG_SYS_POWER_MANAGEMENT
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GEN_OFFSET_SYM(_kernel_t, idle);
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#endif
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GEN_OFFSET_SYM(_kernel_t, ready_q);
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GEN_OFFSET_SYM(_kernel_t, arch);
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GEN_OFFSET_SYM(_ready_q_t, cache);
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#ifdef CONFIG_FP_SHARING
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GEN_OFFSET_SYM(_kernel_t, current_fp);
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#endif
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GEN_ABSOLUTE_SYM(_STRUCT_KERNEL_SIZE, sizeof(struct _kernel));
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GEN_OFFSET_SYM(_thread_base_t, execution_flags);
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GEN_OFFSET_SYM(_thread_base_t, thread_state);
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GEN_OFFSET_SYM(_thread_base_t, prio);
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GEN_OFFSET_SYM(_thread_base_t, sched_locked);
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GEN_OFFSET_SYM(_thread_base_t, swap_data);
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GEN_OFFSET_SYM(_thread_t, base);
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GEN_OFFSET_SYM(_thread_t, caller_saved);
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GEN_OFFSET_SYM(_thread_t, callee_saved);
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GEN_OFFSET_SYM(_thread_t, arch);
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#if defined(CONFIG_THREAD_MONITOR)
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GEN_OFFSET_SYM(_thread_t, next_thread);
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#endif
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#ifdef CONFIG_THREAD_CUSTOM_DATA
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GEN_OFFSET_SYM(_thread_t, custom_data);
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#endif
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GEN_ABSOLUTE_SYM(K_THREAD_SIZEOF, sizeof(struct k_thread));
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/* size of the device structure. Used by linker scripts */
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GEN_ABSOLUTE_SYM(_DEVICE_STRUCT_SIZE, sizeof(struct device));
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#endif /* _kernel_offsets__h_ */
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