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 #include <asm/dsp.h>
18 #include <asm/fpu.h>
19
20 /* Arch specific stuff which needs to be saved per task.
21 * However these items are not so important so as to earn a place in
22 * struct thread_info
23 */
24 struct thread_struct {
25 unsigned long callee_reg; /* pointer to callee regs */
26 unsigned long fault_address; /* dbls as brkpt holder as well */
27 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
28 struct dsp_callee_regs dsp;
29 #endif
30 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
31 struct arc_fpu fpu;
32 #endif
33 };
34
35 #define INIT_THREAD { }
36
37 /* Forward declaration, a strange C thing */
38 struct task_struct;
39
40 #define task_pt_regs(p) \
41 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
42
43 /*
44 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
45 * get optimised away by gcc
46 */
47 #define cpu_relax() barrier()
48
49 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
50 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
51
52 /*
53 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
54 * Look in process.c for details of kernel stack layout
55 */
56 #define TSK_K_ESP(tsk) (task_thread_info(tsk)->ksp)
57
58 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
59 sizeof(struct callee_regs) + off)))
60
61 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
62 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
63
64 extern void start_thread(struct pt_regs * regs, unsigned long pc,
65 unsigned long usp);
66
67 extern unsigned int __get_wchan(struct task_struct *p);
68
69 #endif /* !__ASSEMBLY__ */
70
71 /*
72 * Default System Memory Map on ARC
73 *
74 * ---------------------------- (lower 2G, Translated) -------------------------
75 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
76 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
77 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
78 *
79 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
80 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
81 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
82 * -----------------------------------------------------------------------------
83 */
84
85 #define TASK_SIZE 0x60000000
86
87 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
88
89 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
90 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PMD_SIZE * 4)
91
92 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
93
94 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
95
96 #define STACK_TOP TASK_SIZE
97 #define STACK_TOP_MAX STACK_TOP
98
99 /* This decides where the kernel will search for a free chunk of vm
100 * space during mmap's.
101 */
102 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
103
104 #endif /* __ASM_ARC_PROCESSOR_H */
105
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