arch/csky/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef __ASM_CSKY_PROCESSOR_H
   4 #define __ASM_CSKY_PROCESSOR_H
   5
   6 #include <linux/bitops.h>
   7 #include <linux/cache.h>
   8 #include <asm/ptrace.h>
   9 #include <asm/current.h>
  10 #include <abi/reg_ops.h>
  11 #include <abi/regdef.h>
  12 #include <abi/switch_context.h>
  13 #ifdef CONFIG_CPU_HAS_FPU
  14 #include <abi/fpu.h>
  15 #endif
  16
  17 struct cpuinfo_csky {
  18         unsigned long asid_cache;
  19 } __aligned(SMP_CACHE_BYTES);
  20
  21 extern struct cpuinfo_csky cpu_data[];
  22
  23 /*
  24  * User space process size: 2GB. This is hardcoded into a few places,
  25  * so don't change it unless you know what you are doing.  TASK_SIZE
  26  * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
  27  * implementations will "only" be able to use 1TB ...
  28  */
  29 #define TASK_SIZE       (PAGE_OFFSET - (PAGE_SIZE * 8))
  30
  31 #ifdef __KERNEL__
  32 #define STACK_TOP       TASK_SIZE
  33 #define STACK_TOP_MAX   STACK_TOP
  34 #endif
  35
  36 /* This decides where the kernel will search for a free chunk of vm
  37  * space during mmap's.
  38  */
  39 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  40
  41 struct thread_struct {
  42         unsigned long  sp;        /* kernel stack pointer */
  43         unsigned long  trap_no;   /* saved status register */
  44
  45         /* FPU regs */
  46         struct user_fp __aligned(16) user_fp;
  47 };
  48
  49 #define INIT_THREAD  { \
  50         .sp = sizeof(init_stack) + (unsigned long) &init_stack, \
  51 }
  52
  53 /*
  54  * Do necessary setup to start up a newly executed thread.
  55  *
  56  * pass the data segment into user programs if it exists,
  57  * it can't hurt anything as far as I can tell
  58  */
  59 #define start_thread(_regs, _pc, _usp)                                  \
  60 do {                                                                    \
  61         (_regs)->pc = (_pc);                                            \
  62         (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */   \
  63         (_regs)->regs[2] = 0;                                           \
  64         (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */                \
  65         (_regs)->sr &= ~PS_S;                                           \
  66         (_regs)->usp = (_usp);                                          \
  67 } while (0)
  68
  69 /* Forward declaration, a strange C thing */
  70 struct task_struct;
  71
  72 /* Prepare to copy thread state - unlazy all lazy status */
  73 #define prepare_to_copy(tsk)    do { } while (0)
  74
  75 unsigned long __get_wchan(struct task_struct *p);
  76
  77 #define KSTK_EIP(tsk)           (task_pt_regs(tsk)->pc)
  78 #define KSTK_ESP(tsk)           (task_pt_regs(tsk)->usp)
  79
  80 #define task_pt_regs(p) \
  81         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  82
  83 #define cpu_relax() barrier()
  84
  85 register unsigned long current_stack_pointer __asm__("sp");
  86
  87 #endif /* __ASM_CSKY_PROCESSOR_H */