1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * vineetg: March 2009 9 * -Implemented task_pt_regs( ) 10 * 11 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004 12 */ 13 14 #ifndef __ASM_ARC_PROCESSOR_H 15 #define __ASM_ARC_PROCESSOR_H 16 17 #ifndef __ASSEMBLY__ 18 19 #include <asm/ptrace.h> 20 21 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 22 /* These DPFP regs need to be saved/restored across ctx-sw */ 23 struct arc_fpu { 24 struct { 25 unsigned int l, h; 26 } aux_dpfp[2]; 27 }; 28 #endif 29 30 /* Arch specific stuff which needs to be saved per task. 31 * However these items are not so important so as to earn a place in 32 * struct thread_info 33 */ 34 struct thread_struct { 35 unsigned long ksp; /* kernel mode stack pointer */ 36 unsigned long callee_reg; /* pointer to callee regs */ 37 unsigned long fault_address; /* dbls as brkpt holder as well */ 38 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 39 struct arc_fpu fpu; 40 #endif 41 }; 42 43 #define INIT_THREAD { \ 44 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 45 } 46 47 /* Forward declaration, a strange C thing */ 48 struct task_struct; 49 50 #define task_pt_regs(p) \ 51 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 52 53 /* Free all resources held by a thread */ 54 #define release_thread(thread) do { } while (0) 55 56 /* 57 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 58 * get optimised away by gcc 59 */ 60 #ifndef CONFIG_EZNPS_MTM_EXT 61 62 #define cpu_relax() barrier() 63 #define cpu_relax_lowlatency() cpu_relax() 64 65 #else 66 67 #define cpu_relax() \ 68 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") 69 70 #define cpu_relax_lowlatency() barrier() 71 72 #endif 73 74 #define copy_segments(tsk, mm) do { } while (0) 75 #define release_segments(mm) do { } while (0) 76 77 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 78 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 79 80 /* 81 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 82 * Look in process.c for details of kernel stack layout 83 */ 84 #define TSK_K_ESP(tsk) (tsk->thread.ksp) 85 86 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 87 sizeof(struct callee_regs) + off))) 88 89 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 90 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 91 92 #define thread_saved_pc(tsk) TSK_K_BLINK(tsk) 93 94 extern void start_thread(struct pt_regs * regs, unsigned long pc, 95 unsigned long usp); 96 97 extern unsigned int get_wchan(struct task_struct *p); 98 99 /* 100 * Default implementation of macro that returns current 101 * instruction pointer ("program counter"). 102 * Should the PC register be read instead ? This macro does not seem to 103 * be used in many places so this wont be all that bad. 104 */ 105 #define current_text_addr() ({ __label__ _l; _l: &&_l; }) 106 107 #endif /* !__ASSEMBLY__ */ 108 109 /* 110 * Default System Memory Map on ARC 111 * 112 * ---------------------------- (lower 2G, Translated) ------------------------- 113 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 114 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 115 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 116 * 117 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 118 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 119 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 120 * ----------------------------------------------------------------------------- 121 */ 122 123 #define TASK_SIZE 0x60000000 124 125 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 126 127 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 128 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) 129 130 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 131 132 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 133 134 #ifdef CONFIG_ARC_PLAT_EZNPS 135 /* NPS architecture defines special window of 129M in user address space for 136 * special memory areas, when accessing this window the MMU do not use TLB. 137 * Instead MMU direct the access to: 138 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) 139 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) 140 * 141 * CMEM - is the fastest memory we got and its size is 16K. 142 * FMT - is used to map either to internal/external memory. 143 * Internal memory is the second fast memory and its size is 16M 144 * External memory is the biggest memory (16G) and also the slowest. 145 * 146 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. 147 */ 148 #define STACK_TOP 0x57e00000 149 #else 150 #define STACK_TOP TASK_SIZE 151 #endif 152 153 #define STACK_TOP_MAX STACK_TOP 154 155 /* This decides where the kernel will search for a free chunk of vm 156 * space during mmap's. 157 */ 158 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 159 160 #endif /* __ASM_ARC_PROCESSOR_H */ 161