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Linux/arch/riscv/include/asm/processor.h

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  1 /*
  2  * Copyright (C) 2012 Regents of the University of California
  3  *
  4  *   This program is free software; you can redistribute it and/or
  5  *   modify it under the terms of the GNU General Public License
  6  *   as published by the Free Software Foundation, version 2.
  7  *
  8  *   This program is distributed in the hope that it will be useful,
  9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  *   GNU General Public License for more details.
 12  */
 13 
 14 #ifndef _ASM_RISCV_PROCESSOR_H
 15 #define _ASM_RISCV_PROCESSOR_H
 16 
 17 #include <linux/const.h>
 18 
 19 #include <asm/ptrace.h>
 20 
 21 /*
 22  * This decides where the kernel will search for a free chunk of vm
 23  * space during mmap's.
 24  */
 25 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE / 3)
 26 
 27 #define STACK_TOP               TASK_SIZE
 28 #define STACK_TOP_MAX           STACK_TOP
 29 #define STACK_ALIGN             16
 30 
 31 #ifndef __ASSEMBLY__
 32 
 33 struct task_struct;
 34 struct pt_regs;
 35 
 36 /* CPU-specific state of a task */
 37 struct thread_struct {
 38         /* Callee-saved registers */
 39         unsigned long ra;
 40         unsigned long sp;       /* Kernel mode stack */
 41         unsigned long s[12];    /* s[0]: frame pointer */
 42         struct __riscv_d_ext_state fstate;
 43 };
 44 
 45 #define INIT_THREAD {                                   \
 46         .sp = sizeof(init_stack) + (long)&init_stack,   \
 47 }
 48 
 49 #define task_pt_regs(tsk)                                               \
 50         ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE          \
 51                             - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
 52 
 53 #define KSTK_EIP(tsk)           (task_pt_regs(tsk)->sepc)
 54 #define KSTK_ESP(tsk)           (task_pt_regs(tsk)->sp)
 55 
 56 
 57 /* Do necessary setup to start up a newly executed thread. */
 58 extern void start_thread(struct pt_regs *regs,
 59                         unsigned long pc, unsigned long sp);
 60 
 61 /* Free all resources held by a thread. */
 62 static inline void release_thread(struct task_struct *dead_task)
 63 {
 64 }
 65 
 66 extern unsigned long get_wchan(struct task_struct *p);
 67 
 68 
 69 static inline void cpu_relax(void)
 70 {
 71 #ifdef __riscv_muldiv
 72         int dummy;
 73         /* In lieu of a halt instruction, induce a long-latency stall. */
 74         __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
 75 #endif
 76         barrier();
 77 }
 78 
 79 static inline void wait_for_interrupt(void)
 80 {
 81         __asm__ __volatile__ ("wfi");
 82 }
 83 
 84 struct device_node;
 85 int riscv_of_processor_hartid(struct device_node *node);
 86 
 87 extern void riscv_fill_hwcap(void);
 88 
 89 #endif /* __ASSEMBLY__ */
 90 
 91 #endif /* _ASM_RISCV_PROCESSOR_H */
 92 

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