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 */
  20 struct arc_fpu {
  21         struct {
  22                 unsigned int l, h;
  23         } aux_dpfp[2];
  24 };
  25 #endif
  26
  27 #ifdef CONFIG_ARC_PLAT_EZNPS
  28 struct 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  */
  38 struct 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 */
  55 struct 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
  93 extern void start_thread(struct pt_regs * regs, unsigned long pc,
  94                          unsigned long usp);
  95
  96 extern 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 */