14726dd60SMichal Simek /* SPDX-License-Identifier: GPL-2.0 */
24511ec15SMichal Simek /*
35233806dSMichal Simek  * Copyright (C) 2008-2009 Michal Simek <[email protected]>
45233806dSMichal Simek  * Copyright (C) 2008-2009 PetaLogix
54511ec15SMichal Simek  * Copyright (C) 2006 Atmark Techno, Inc.
64511ec15SMichal Simek  */
74511ec15SMichal Simek 
84511ec15SMichal Simek #ifndef _ASM_MICROBLAZE_PROCESSOR_H
94511ec15SMichal Simek #define _ASM_MICROBLAZE_PROCESSOR_H
104511ec15SMichal Simek 
114511ec15SMichal Simek #include <asm/ptrace.h>
124511ec15SMichal Simek #include <asm/setup.h>
134511ec15SMichal Simek #include <asm/registers.h>
142921e2bdSMichal Simek #include <asm/entry.h>
152921e2bdSMichal Simek #include <asm/current.h>
164511ec15SMichal Simek 
174511ec15SMichal Simek # ifndef __ASSEMBLY__
184511ec15SMichal Simek /* from kernel/cpu/mb.c */
194511ec15SMichal Simek extern const struct seq_operations cpuinfo_op;
204511ec15SMichal Simek 
214511ec15SMichal Simek # define cpu_relax()		barrier()
224511ec15SMichal Simek 
232eba318eSMichal Simek #define task_pt_regs(tsk) \
242eba318eSMichal Simek 		(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
252eba318eSMichal Simek 
26e1c4bd08SMichal Simek /* Do necessary setup to start up a newly executed thread. */
27e1c4bd08SMichal Simek void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
28e1c4bd08SMichal Simek 
290dd90aa9SMichal Simek extern void ret_from_fork(void);
302319295dSAl Viro extern void ret_from_kernel_thread(void);
310dd90aa9SMichal Simek 
325233806dSMichal Simek # endif /* __ASSEMBLY__ */
335233806dSMichal Simek 
345233806dSMichal Simek /*
355233806dSMichal Simek  * This is used to define STACK_TOP, and with MMU it must be below
365233806dSMichal Simek  * kernel base to select the correct PGD when handling MMU exceptions.
375233806dSMichal Simek  */
385233806dSMichal Simek # define TASK_SIZE	(CONFIG_KERNEL_START)
395233806dSMichal Simek 
405233806dSMichal Simek /*
415233806dSMichal Simek  * This decides where the kernel will search for a free chunk of vm
425233806dSMichal Simek  * space during mmap's.
435233806dSMichal Simek  */
445233806dSMichal Simek # define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
455233806dSMichal Simek 
465233806dSMichal Simek # define THREAD_KSP	0
475233806dSMichal Simek 
485233806dSMichal Simek #  ifndef __ASSEMBLY__
495233806dSMichal Simek 
505233806dSMichal Simek /* If you change this, you must change the associated assembly-languages
515233806dSMichal Simek  * constants defined below, THREAD_*.
525233806dSMichal Simek  */
535233806dSMichal Simek struct thread_struct {
545233806dSMichal Simek 	/* kernel stack pointer (must be first field in structure) */
555233806dSMichal Simek 	unsigned long	ksp;
565233806dSMichal Simek 	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
575233806dSMichal Simek 	void		*pgdir;		/* root of page-table tree */
585233806dSMichal Simek 	struct pt_regs	*regs;		/* Pointer to saved register state */
595233806dSMichal Simek };
605233806dSMichal Simek 
615233806dSMichal Simek #  define INIT_THREAD { \
625233806dSMichal Simek 	.ksp   = sizeof init_stack + (unsigned long)init_stack, \
635233806dSMichal Simek 	.pgdir = swapper_pg_dir, \
645233806dSMichal Simek }
655233806dSMichal Simek 
66*42a20f86SKees Cook unsigned long __get_wchan(struct task_struct *p);
675233806dSMichal Simek 
685233806dSMichal Simek /* The size allocated for kernel stacks. This _must_ be a power of two! */
695233806dSMichal Simek # define KERNEL_STACK_SIZE	0x2000
705233806dSMichal Simek 
715233806dSMichal Simek /* Return some info about the user process TASK.  */
725233806dSMichal Simek #  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
735233806dSMichal Simek #  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
745233806dSMichal Simek 
755233806dSMichal Simek #  define task_pt_regs_plus_args(tsk) \
766e83557cSMichal Simek 	((void *)task_pt_regs(tsk))
775233806dSMichal Simek 
785233806dSMichal Simek #  define task_sp(task)	(task_regs(task)->r1)
795233806dSMichal Simek #  define task_pc(task)	(task_regs(task)->pc)
805233806dSMichal Simek /* Grotty old names for some.  */
815233806dSMichal Simek #  define KSTK_EIP(task)	(task_pc(task))
825233806dSMichal Simek #  define KSTK_ESP(task)	(task_sp(task))
835233806dSMichal Simek 
845233806dSMichal Simek #  define STACK_TOP	TASK_SIZE
855233806dSMichal Simek #  define STACK_TOP_MAX	STACK_TOP
865233806dSMichal Simek 
87c40d04dfSDavid Howells #ifdef CONFIG_DEBUG_FS
88c40d04dfSDavid Howells extern struct dentry *of_debugfs_root;
89c40d04dfSDavid Howells #endif
90c40d04dfSDavid Howells 
915233806dSMichal Simek #  endif /* __ASSEMBLY__ */
924511ec15SMichal Simek #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
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