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2214c0e772
This implements the CONFIG_THREAD_INFO_IN_TASK option. With this change: - before thread_info was part of the stack and located at the beginning of the stack - now the thread_info struct is moved and located inside the task_struct structure - the stack is allocated and handled like the major other platforms - drop the cpu field of thread_info and use instead the one in task_struct Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sven Schnelle <svens@stackframe.org>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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extern int init_per_cpu(int cpuid);
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#if defined(CONFIG_SMP)
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/* Page Zero Location PDC will look for the address to branch to when we poke
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** slave CPUs still in "Icache loop".
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*/
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#define PDC_OS_BOOT_RENDEZVOUS 0x10
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#define PDC_OS_BOOT_RENDEZVOUS_HI 0x28
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#ifndef ASSEMBLY
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#include <linux/bitops.h>
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#include <linux/threads.h> /* for NR_CPUS */
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#include <linux/cpumask.h>
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typedef unsigned long address_t;
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/*
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* Private routines/data
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*
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* physical and logical are equivalent until we support CPU hotplug.
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*/
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#define cpu_number_map(cpu) (cpu)
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#define cpu_logical_map(cpu) (cpu)
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extern void smp_send_all_nop(void);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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#endif /* !ASSEMBLY */
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/*
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* This is particularly ugly: it appears we can't actually get the definition
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* of task_struct here, but we need access to the CPU this task is running on.
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* Instead of using task_struct we're using TASK_CPU which is extracted from
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* asm-offsets.h by kbuild to get the current processor ID.
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*
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* This also needs to be safeguarded when building asm-offsets.s because at
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* that time TASK_CPU is not defined yet. It could have been guarded by
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* TASK_CPU itself, but we want the build to fail if TASK_CPU is missing
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* when building something else than asm-offsets.s
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*/
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#ifdef GENERATING_ASM_OFFSETS
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#define raw_smp_processor_id() (0)
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#else
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#include <asm/asm-offsets.h>
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#define raw_smp_processor_id() (*(unsigned int *)((void *)current + TASK_CPU))
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#endif
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#else /* CONFIG_SMP */
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static inline void smp_send_all_nop(void) { return; }
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#endif
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#define ANY_PROC_ID 0xFF /* Any processor magic marker */
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static inline int __cpu_disable (void) {
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return 0;
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}
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static inline void __cpu_die (unsigned int cpu) {
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while(1)
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;
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}
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#endif /* __ASM_SMP_H */
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