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