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

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4 *
   5 * vineetg: March 2009
   6 *  -Implemented task_pt_regs( )
   7 *
   8 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
   9 */
  10
  11#ifndef __ASM_ARC_PROCESSOR_H
  12#define __ASM_ARC_PROCESSOR_H
  13
  14#ifndef __ASSEMBLY__
  15
  16#include <asm/ptrace.h>
  17
  18#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
  19/* These DPFP regs need to be saved/restored across ctx-sw */
  20struct arc_fpu {
  21        struct {
  22                unsigned int l, h;
  23        } aux_dpfp[2];
  24};
  25#endif
  26
  27#ifdef CONFIG_ARC_PLAT_EZNPS
  28struct eznps_dp {
  29        unsigned int eflags;
  30        unsigned int gpa1;
  31};
  32#endif
  33
  34/* Arch specific stuff which needs to be saved per task.
  35 * However these items are not so important so as to earn a place in
  36 * struct thread_info
  37 */
  38struct thread_struct {
  39        unsigned long ksp;      /* kernel mode stack pointer */
  40        unsigned long callee_reg;       /* pointer to callee regs */
  41        unsigned long fault_address;    /* dbls as brkpt holder as well */
  42#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
  43        struct arc_fpu fpu;
  44#endif
  45#ifdef CONFIG_ARC_PLAT_EZNPS
  46        struct eznps_dp dp;
  47#endif
  48};
  49
  50#define INIT_THREAD  {                          \
  51        .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
  52}
  53
  54/* Forward declaration, a strange C thing */
  55struct task_struct;
  56
  57#define task_pt_regs(p) \
  58        ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
  59
  60/* Free all resources held by a thread */
  61#define release_thread(thread) do { } while (0)
  62
  63/*
  64 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
  65 * get optimised away by gcc
  66 */
  67#ifndef CONFIG_EZNPS_MTM_EXT
  68
  69#define cpu_relax()             barrier()
  70
  71#else
  72
  73#define cpu_relax()     \
  74        __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
  75
  76#endif
  77
  78#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->ret)
  79#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
  80
  81/*
  82 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
  83 * Look in process.c for details of kernel stack layout
  84 */
  85#define TSK_K_ESP(tsk)          (tsk->thread.ksp)
  86
  87#define TSK_K_REG(tsk, off)     (*((unsigned long *)(TSK_K_ESP(tsk) + \
  88                                        sizeof(struct callee_regs) + off)))
  89
  90#define TSK_K_BLINK(tsk)        TSK_K_REG(tsk, 4)
  91#define TSK_K_FP(tsk)           TSK_K_REG(tsk, 0)
  92
  93extern void start_thread(struct pt_regs * regs, unsigned long pc,
  94                         unsigned long usp);
  95
  96extern unsigned int get_wchan(struct task_struct *p);
  97
  98#endif /* !__ASSEMBLY__ */
  99
 100/*
 101 * Default System Memory Map on ARC
 102 *
 103 * ---------------------------- (lower 2G, Translated) -------------------------
 104 * 0x0000_0000          0x5FFF_FFFF     (user vaddr: TASK_SIZE)
 105 * 0x6000_0000          0x6FFF_FFFF     (reserved gutter between U/K)
 106 * 0x7000_0000          0x7FFF_FFFF     (kvaddr: vmalloc/modules/pkmap..)
 107 *
 108 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
 109 * 0x8000_0000          0xBFFF_FFFF     (kernel direct mapped)
 110 * 0xC000_0000          0xFFFF_FFFF     (peripheral uncached space)
 111 * -----------------------------------------------------------------------------
 112 */
 113
 114#define TASK_SIZE       0x60000000
 115
 116#define VMALLOC_START   (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
 117
 118/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
 119#define VMALLOC_SIZE    ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
 120
 121#define VMALLOC_END     (VMALLOC_START + VMALLOC_SIZE)
 122
 123#define USER_KERNEL_GUTTER    (VMALLOC_START - TASK_SIZE)
 124
 125#ifdef CONFIG_ARC_PLAT_EZNPS
 126/* NPS architecture defines special window of 129M in user address space for
 127 * special memory areas, when accessing this window the MMU do not use TLB.
 128 * Instead MMU direct the access to:
 129 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
 130 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
 131 *
 132 * CMEM - is the fastest memory we got and its size is 16K.
 133 * FMT  - is used to map either to internal/external memory.
 134 * Internal memory is the second fast memory and its size is 16M
 135 * External memory is the biggest memory (16G) and also the slowest.
 136 *
 137 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
 138 */
 139#define STACK_TOP       0x57e00000
 140#else
 141#define STACK_TOP       TASK_SIZE
 142#endif
 143
 144#define STACK_TOP_MAX   STACK_TOP
 145
 146/* This decides where the kernel will search for a free chunk of vm
 147 * space during mmap's.
 148 */
 149#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
 150
 151#endif /* __ASM_ARC_PROCESSOR_H */
 152