Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/csky/include/asm/processor.h
25922 views
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


89