1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef __ASM_CSKY_PROCESSOR_H
4 #define __ASM_CSKY_PROCESSOR_H
5
6 #include <linux/bitops.h>
7 #include <linux/cache.h>
8 #include <asm/ptrace.h>
9 #include <asm/current.h>
10 #include <abi/reg_ops.h>
11 #include <abi/regdef.h>
12 #include <abi/switch_context.h>
13 #ifdef CONFIG_CPU_HAS_FPU
14 #include <abi/fpu.h>
15 #endif
16
17 struct cpuinfo_csky {
18 unsigned long asid_cache;
19 } __aligned(SMP_CACHE_BYTES);
20
21 extern struct cpuinfo_csky cpu_data[];
22
23 /*
24 * User space process size: 2GB. This is hardcoded into a few places,
25 * so don't change it unless you know what you are doing. TASK_SIZE
26 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
27 * implementations will "only" be able to use 1TB ...
28 */
29 #define TASK_SIZE (PAGE_OFFSET - (PAGE_SIZE * 8))
30
31 #ifdef __KERNEL__
32 #define STACK_TOP TASK_SIZE
33 #define STACK_TOP_MAX STACK_TOP
34 #endif
35
36 /* This decides where the kernel will search for a free chunk of vm
37 * space during mmap's.
38 */
39 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
40
41 struct thread_struct {
42 unsigned long sp; /* kernel stack pointer */
43 unsigned long trap_no; /* saved status register */
44
45 /* FPU regs */
46 struct user_fp __aligned(16) user_fp;
47 };
48
49 #define INIT_THREAD { \
50 .sp = sizeof(init_stack) + (unsigned long) &init_stack, \
51 }
52
53 /*
54 * Do necessary setup to start up a newly executed thread.
55 *
56 * pass the data segment into user programs if it exists,
57 * it can't hurt anything as far as I can tell
58 */
59 #define start_thread(_regs, _pc, _usp) \
60 do { \
61 (_regs)->pc = (_pc); \
62 (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \
63 (_regs)->regs[2] = 0; \
64 (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \
65 (_regs)->sr &= ~PS_S; \
66 (_regs)->usp = (_usp); \
67 } while (0)
68
69 /* Forward declaration, a strange C thing */
70 struct task_struct;
71
72 /* Prepare to copy thread state - unlazy all lazy status */
73 #define prepare_to_copy(tsk) do { } while (0)
74
75 unsigned long __get_wchan(struct task_struct *p);
76
77 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
78 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp)
79
80 #define task_pt_regs(p) \
81 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
82
83 #define cpu_relax() barrier()
84
85 register unsigned long current_stack_pointer __asm__("sp");
86
87 #endif /* __ASM_CSKY_PROCESSOR_H */
88
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