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 #ifdef CONFIG_ARC_PLAT_EZNPS 31 struct eznps_dp { 32 unsigned int eflags; 33 unsigned int gpa1; 34 }; 35 #endif 36 37 /* Arch specific stuff which needs to be saved per task. 38 * However these items are not so important so as to earn a place in 39 * struct thread_info 40 */ 41 struct thread_struct { 42 unsigned long ksp; /* kernel mode stack pointer */ 43 unsigned long callee_reg; /* pointer to callee regs */ 44 unsigned long fault_address; /* dbls as brkpt holder as well */ 45 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 46 struct arc_fpu fpu; 47 #endif 48 #ifdef CONFIG_ARC_PLAT_EZNPS 49 struct eznps_dp dp; 50 #endif 51 }; 52 53 #define INIT_THREAD { \ 54 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 55 } 56 57 /* Forward declaration, a strange C thing */ 58 struct task_struct; 59 60 #define task_pt_regs(p) \ 61 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 62 63 /* Free all resources held by a thread */ 64 #define release_thread(thread) do { } while (0) 65 66 /* 67 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 68 * get optimised away by gcc 69 */ 70 #ifndef CONFIG_EZNPS_MTM_EXT 71 72 #define cpu_relax() barrier() 73 74 #else 75 76 #define cpu_relax() \ 77 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") 78 79 #endif 80 81 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 82 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 83 84 /* 85 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 86 * Look in process.c for details of kernel stack layout 87 */ 88 #define TSK_K_ESP(tsk) (tsk->thread.ksp) 89 90 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 91 sizeof(struct callee_regs) + off))) 92 93 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 94 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 95 96 extern void start_thread(struct pt_regs * regs, unsigned long pc, 97 unsigned long usp); 98 99 extern unsigned int get_wchan(struct task_struct *p); 100 101 #endif /* !__ASSEMBLY__ */ 102 103 /* 104 * Default System Memory Map on ARC 105 * 106 * ---------------------------- (lower 2G, Translated) ------------------------- 107 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 108 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 109 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 110 * 111 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 112 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 113 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 114 * ----------------------------------------------------------------------------- 115 */ 116 117 #define TASK_SIZE 0x60000000 118 119 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 120 121 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 122 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) 123 124 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 125 126 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 127 128 #ifdef CONFIG_ARC_PLAT_EZNPS 129 /* NPS architecture defines special window of 129M in user address space for 130 * special memory areas, when accessing this window the MMU do not use TLB. 131 * Instead MMU direct the access to: 132 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) 133 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) 134 * 135 * CMEM - is the fastest memory we got and its size is 16K. 136 * FMT - is used to map either to internal/external memory. 137 * Internal memory is the second fast memory and its size is 16M 138 * External memory is the biggest memory (16G) and also the slowest. 139 * 140 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. 141 */ 142 #define STACK_TOP 0x57e00000 143 #else 144 #define STACK_TOP TASK_SIZE 145 #endif 146 147 #define STACK_TOP_MAX STACK_TOP 148 149 /* This decides where the kernel will search for a free chunk of vm 150 * space during mmap's. 151 */ 152 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 153 154 #endif /* __ASM_ARC_PROCESSOR_H */ 155