LXR linux/arch/c6x/include/asm/processor.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 *  Port on Texas Instruments TMS320C6x architecture
   4 *
   5 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   6 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   7 *
   8 *  Updated for 2.6.34: Mark Salter <msalter@redhat.com>
   9 */
  10#ifndef _ASM_C6X_PROCESSOR_H
  11#define _ASM_C6X_PROCESSOR_H
  12
  13#include <asm/ptrace.h>
  14#include <asm/page.h>
  15#include <asm/current.h>
  16
  17/*
  18 * User space process size. This is mostly meaningless for NOMMU
  19 * but some C6X processors may have RAM addresses up to 0xFFFFFFFF.
  20 * Since calls like mmap() can return an address or an error, we
  21 * have to allow room for error returns when code does something
  22 * like:
  23 *
  24 *       addr = do_mmap(...)
  25 *       if ((unsigned long)addr >= TASK_SIZE)
  26 *            ... its an error code, not an address ...
  27 *
  28 * Here, we allow for 4096 error codes which means we really can't
  29 * use the last 4K page on systems with RAM extending all the way
  30 * to the end of the 32-bit address space.
  31 */
  32#define TASK_SIZE       0xFFFFF000
  33
  34/*
  35 * This decides where the kernel will search for a free chunk of vm
  36 * space during mmap's. We won't be using it
  37 */
  38#define TASK_UNMAPPED_BASE      0
  39
  40struct thread_struct {
  41        unsigned long long b15_14;
  42        unsigned long long a15_14;
  43        unsigned long long b13_12;
  44        unsigned long long a13_12;
  45        unsigned long long b11_10;
  46        unsigned long long a11_10;
  47        unsigned long long ricl_icl;
  48        unsigned long  usp;             /* user stack pointer */
  49        unsigned long  pc;              /* kernel pc */
  50        unsigned long  wchan;
  51};
  52
  53#define INIT_THREAD                                     \
  54{                                                       \
  55        .usp = 0,                                       \
  56        .wchan = 0,                                     \
  57}
  58
  59#define INIT_MMAP { \
  60        &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
  61        NULL, NULL }
  62
  63#define task_pt_regs(task) \
  64        ((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1)
  65
  66#define alloc_kernel_stack()    __get_free_page(GFP_KERNEL)
  67#define free_kernel_stack(page) free_page((page))
  68
  69
  70/* Forward declaration, a strange C thing */
  71struct task_struct;
  72
  73extern void start_thread(struct pt_regs *regs, unsigned int pc,
  74                         unsigned long usp);
  75
  76/* Free all resources held by a thread. */
  77static inline void release_thread(struct task_struct *dead_task)
  78{
  79}
  80
  81/*
  82 * saved kernel SP and DP of a blocked thread.
  83 */
  84#ifdef _BIG_ENDIAN
  85#define thread_saved_ksp(tsk) \
  86        (*(unsigned long *)&(tsk)->thread.b15_14)
  87#define thread_saved_dp(tsk) \
  88        (*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
  89#else
  90#define thread_saved_ksp(tsk) \
  91        (*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
  92#define thread_saved_dp(tsk) \
  93        (*(unsigned long *)&(tsk)->thread.b15_14)
  94#endif
  95
  96extern unsigned long get_wchan(struct task_struct *p);
  97
  98#define KSTK_EIP(task)  (task_pt_regs(task)->pc)
  99#define KSTK_ESP(task)  (task_pt_regs(task)->sp)
 100
 101#define cpu_relax()             do { } while (0)
 102
 103extern const struct seq_operations cpuinfo_op;
 104
 105/* Reset the board */
 106#define HARD_RESET_NOW()
 107
 108extern unsigned int c6x_core_freq;
 109
 110
 111extern void (*c6x_restart)(void);
 112extern void (*c6x_halt)(void);
 113
 114#endif /* ASM_C6X_PROCESSOR_H */
 115