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
  23 struct 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
  38 struct 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 */
  77 struct 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
  85 unsigned 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  */
  96 extern 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 */