LXR linux/arch/nds32/include/asm/processor.h

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4#ifndef __ASM_NDS32_PROCESSOR_H
   5#define __ASM_NDS32_PROCESSOR_H
   6
   7/*
   8 * Default implementation of macro that returns current
   9 * instruction pointer ("program counter").
  10 */
  11#define current_text_addr() ({ __label__ _l; _l: &&_l;})
  12
  13#ifdef __KERNEL__
  14
  15#include <asm/ptrace.h>
  16#include <asm/types.h>
  17#include <asm/sigcontext.h>
  18
  19#define KERNEL_STACK_SIZE       PAGE_SIZE
  20#define STACK_TOP       TASK_SIZE
  21#define STACK_TOP_MAX   TASK_SIZE
  22
  23struct cpu_context {
  24        unsigned long r6;
  25        unsigned long r7;
  26        unsigned long r8;
  27        unsigned long r9;
  28        unsigned long r10;
  29        unsigned long r11;
  30        unsigned long r12;
  31        unsigned long r13;
  32        unsigned long r14;
  33        unsigned long fp;
  34        unsigned long pc;
  35        unsigned long sp;
  36};
  37
  38struct thread_struct {
  39        struct cpu_context cpu_context; /* cpu context */
  40        /* fault info     */
  41        unsigned long address;
  42        unsigned long trap_no;
  43        unsigned long error_code;
  44};
  45
  46#define INIT_THREAD  {  }
  47
  48#ifdef __NDS32_EB__
  49#define PSW_DE  PSW_mskBE
  50#else
  51#define PSW_DE  0x0
  52#endif
  53
  54#ifdef CONFIG_WBNA
  55#define PSW_valWBNA     PSW_mskWBNA
  56#else
  57#define PSW_valWBNA     0x0
  58#endif
  59
  60#ifdef CONFIG_HWZOL
  61#define PSW_valINIT (PSW_CPL_ANY | PSW_mskAEN | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
  62#else
  63#define PSW_valINIT (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
  64#endif
  65
  66#define start_thread(regs,pc,stack)                     \
  67({                                                      \
  68        memzero(regs, sizeof(struct pt_regs));          \
  69        forget_syscall(regs);                           \
  70        regs->ipsw = PSW_valINIT;                       \
  71        regs->ir0 = (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_SYSTEM | PSW_INTL_1);     \
  72        regs->ipc = pc;                                 \
  73        regs->sp = stack;                               \
  74})
  75
  76/* Forward declaration, a strange C thing */
  77struct task_struct;
  78
  79/* Free all resources held by a thread. */
  80#define release_thread(thread) do { } while(0)
  81
  82/* Prepare to copy thread state - unlazy all lazy status */
  83#define prepare_to_copy(tsk)    do { } while (0)
  84
  85unsigned long get_wchan(struct task_struct *p);
  86
  87#define cpu_relax()                     barrier()
  88
  89#define task_pt_regs(task) \
  90        ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE \
  91                - 8) - 1)
  92
  93/*
  94 * Create a new kernel thread
  95 */
  96extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
  97
  98#define KSTK_EIP(tsk)   instruction_pointer(task_pt_regs(tsk))
  99#define KSTK_ESP(tsk)   user_stack_pointer(task_pt_regs(tsk))
 100
 101#endif
 102
 103#endif /* __ASM_NDS32_PROCESSOR_H */
 104