LXR linux/arch/riscv/include/asm/processor.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2012 Regents of the University of California
   4 */
   5
   6#ifndef _ASM_RISCV_PROCESSOR_H
   7#define _ASM_RISCV_PROCESSOR_H
   8
   9#include <linux/const.h>
  10
  11#include <vdso/processor.h>
  12
  13#include <asm/ptrace.h>
  14
  15/*
  16 * This decides where the kernel will search for a free chunk of vm
  17 * space during mmap's.
  18 */
  19#define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE / 3)
  20
  21#define STACK_TOP               TASK_SIZE
  22#define STACK_TOP_MAX           STACK_TOP
  23#define STACK_ALIGN             16
  24
  25#ifndef __ASSEMBLY__
  26
  27struct task_struct;
  28struct pt_regs;
  29
  30/* CPU-specific state of a task */
  31struct thread_struct {
  32        /* Callee-saved registers */
  33        unsigned long ra;
  34        unsigned long sp;       /* Kernel mode stack */
  35        unsigned long s[12];    /* s[0]: frame pointer */
  36        struct __riscv_d_ext_state fstate;
  37};
  38
  39#define INIT_THREAD {                                   \
  40        .sp = sizeof(init_stack) + (long)&init_stack,   \
  41}
  42
  43#define task_pt_regs(tsk)                                               \
  44        ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE          \
  45                            - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
  46
  47#define KSTK_EIP(tsk)           (task_pt_regs(tsk)->epc)
  48#define KSTK_ESP(tsk)           (task_pt_regs(tsk)->sp)
  49
  50
  51/* Do necessary setup to start up a newly executed thread. */
  52extern void start_thread(struct pt_regs *regs,
  53                        unsigned long pc, unsigned long sp);
  54
  55/* Free all resources held by a thread. */
  56static inline void release_thread(struct task_struct *dead_task)
  57{
  58}
  59
  60extern unsigned long get_wchan(struct task_struct *p);
  61
  62
  63static inline void wait_for_interrupt(void)
  64{
  65        __asm__ __volatile__ ("wfi");
  66}
  67
  68struct device_node;
  69int riscv_of_processor_hartid(struct device_node *node);
  70int riscv_of_parent_hartid(struct device_node *node);
  71
  72extern void riscv_fill_hwcap(void);
  73
  74#endif /* __ASSEMBLY__ */
  75
  76#endif /* _ASM_RISCV_PROCESSOR_H */
  77