linux/arch/csky/include/asm/processor.h
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   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 <asm/segment.h>
   8#include <asm/ptrace.h>
   9#include <asm/current.h>
  10#include <asm/cache.h>
  11#include <abi/reg_ops.h>
  12#include <abi/regdef.h>
  13#include <abi/switch_context.h>
  14#ifdef CONFIG_CPU_HAS_FPU
  15#include <abi/fpu.h>
  16#endif
  17
  18struct cpuinfo_csky {
  19        unsigned long asid_cache;
  20} __aligned(SMP_CACHE_BYTES);
  21
  22extern struct cpuinfo_csky cpu_data[];
  23
  24/*
  25 * User space process size: 2GB. This is hardcoded into a few places,
  26 * so don't change it unless you know what you are doing.  TASK_SIZE
  27 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
  28 * implementations will "only" be able to use 1TB ...
  29 */
  30#define TASK_SIZE       (PAGE_OFFSET - (PAGE_SIZE * 8))
  31
  32#ifdef __KERNEL__
  33#define STACK_TOP       TASK_SIZE
  34#define STACK_TOP_MAX   STACK_TOP
  35#endif
  36
  37/* This decides where the kernel will search for a free chunk of vm
  38 * space during mmap's.
  39 */
  40#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  41
  42struct thread_struct {
  43        unsigned long  sp;        /* kernel stack pointer */
  44        unsigned long  trap_no;   /* saved status register */
  45
  46        /* FPU regs */
  47        struct user_fp __aligned(16) user_fp;
  48};
  49
  50#define INIT_THREAD  { \
  51        .sp = sizeof(init_stack) + (unsigned long) &init_stack, \
  52}
  53
  54/*
  55 * Do necessary setup to start up a newly executed thread.
  56 *
  57 * pass the data segment into user programs if it exists,
  58 * it can't hurt anything as far as I can tell
  59 */
  60#define start_thread(_regs, _pc, _usp)                                  \
  61do {                                                                    \
  62        set_fs(USER_DS); /* reads from user space */                    \
  63        (_regs)->pc = (_pc);                                            \
  64        (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */   \
  65        (_regs)->regs[2] = 0;                                           \
  66        (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */                \
  67        (_regs)->sr &= ~PS_S;                                           \
  68        (_regs)->usp = (_usp);                                          \
  69} while (0)
  70
  71/* Forward declaration, a strange C thing */
  72struct task_struct;
  73
  74/* Free all resources held by a thread. */
  75static inline void release_thread(struct task_struct *dead_task)
  76{
  77}
  78
  79/* Prepare to copy thread state - unlazy all lazy status */
  80#define prepare_to_copy(tsk)    do { } while (0)
  81
  82extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  83
  84unsigned long get_wchan(struct task_struct *p);
  85
  86#define KSTK_EIP(tsk)           (task_pt_regs(tsk)->pc)
  87#define KSTK_ESP(tsk)           (task_pt_regs(tsk)->usp)
  88
  89#define task_pt_regs(p) \
  90        ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  91
  92#define cpu_relax() barrier()
  93
  94#endif /* __ASM_CSKY_PROCESSOR_H */
  95
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