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
17struct cpuinfo_csky {
18	unsigned long asid_cache;
19} __aligned(SMP_CACHE_BYTES);
20
21extern 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
41struct 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)					\
60do {									\
 
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 */
70struct task_struct;
71
 
 
 
 
 
72/* Prepare to copy thread state - unlazy all lazy status */
73#define prepare_to_copy(tsk)    do { } while (0)
74
75extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
76
77unsigned long __get_wchan(struct task_struct *p);
78
79#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
80#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->usp)
81
82#define task_pt_regs(p) \
83	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
84
85#define cpu_relax() barrier()
86
87register unsigned long current_stack_pointer __asm__("sp");
88
89#endif /* __ASM_CSKY_PROCESSOR_H */

 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 <asm/segment.h>
 8#include <asm/ptrace.h>
 9#include <asm/current.h>
10#include <asm/cache.h>
11#include <abi/reg_ops.h>
12#include <abi/regdef.h>
13#include <abi/switch_context.h>
14#ifdef CONFIG_CPU_HAS_FPU
15#include <abi/fpu.h>
16#endif
17
18struct cpuinfo_csky {
19	unsigned long asid_cache;
20} __aligned(SMP_CACHE_BYTES);
21
22extern struct cpuinfo_csky cpu_data[];
23
24/*
25 * User space process size: 2GB. This is hardcoded into a few places,
26 * so don't change it unless you know what you are doing.  TASK_SIZE
27 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY
28 * implementations will "only" be able to use 1TB ...
29 */
30#define TASK_SIZE	(PAGE_OFFSET - (PAGE_SIZE * 8))
31
32#ifdef __KERNEL__
33#define STACK_TOP       TASK_SIZE
34#define STACK_TOP_MAX   STACK_TOP
35#endif
36
37/* This decides where the kernel will search for a free chunk of vm
38 * space during mmap's.
39 */
40#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
41
42struct thread_struct {
43	unsigned long  sp;        /* kernel stack pointer */
44	unsigned long  trap_no;   /* saved status register */
45
46	/* FPU regs */
47	struct user_fp __aligned(16) user_fp;
48};
49
50#define INIT_THREAD  { \
51	.sp = sizeof(init_stack) + (unsigned long) &init_stack, \
52}
53
54/*
55 * Do necessary setup to start up a newly executed thread.
56 *
57 * pass the data segment into user programs if it exists,
58 * it can't hurt anything as far as I can tell
59 */
60#define start_thread(_regs, _pc, _usp)					\
61do {									\
62	set_fs(USER_DS); /* reads from user space */			\
63	(_regs)->pc = (_pc);						\
64	(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */	\
65	(_regs)->regs[2] = 0;						\
66	(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */		\
67	(_regs)->sr &= ~PS_S;						\
68	(_regs)->usp = (_usp);						\
69} while (0)
70
71/* Forward declaration, a strange C thing */
72struct task_struct;
73
74/* Free all resources held by a thread. */
75static inline void release_thread(struct task_struct *dead_task)
76{
77}
78
79/* Prepare to copy thread state - unlazy all lazy status */
80#define prepare_to_copy(tsk)    do { } while (0)
81
82extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
83
84unsigned long get_wchan(struct task_struct *p);
85
86#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
87#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->usp)
88
89#define task_pt_regs(p) \
90	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
91
92#define cpu_relax() barrier()
 
 
93
94#endif /* __ASM_CSKY_PROCESSOR_H */