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
  27 struct task_struct;
  28 struct pt_regs;
  29
  30 /* CPU-specific state of a task */
  31 struct 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. */
  52 extern void start_thread(struct pt_regs *regs,
  53                         unsigned long pc, unsigned long sp);
  54
  55 /* Free all resources held by a thread. */
  56 static inline void release_thread(struct task_struct *dead_task)
  57 {
  58 }
  59
  60 extern unsigned long get_wchan(struct task_struct *p);
  61
  62
  63 static inline void wait_for_interrupt(void)
  64 {
  65         __asm__ __volatile__ ("wfi");
  66 }
  67
  68 struct device_node;
  69 int riscv_of_processor_hartid(struct device_node *node);
  70 int riscv_of_parent_hartid(struct device_node *node);
  71
  72 extern void riscv_fill_hwcap(void);
  73
  74 #endif /* __ASSEMBLY__ */
  75
  76 #endif /* _ASM_RISCV_PROCESSOR_H */