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 */