arch/s390/include/asm/sigp.h

Source file repositories/reference/linux-study-clean/arch/s390/include/asm/sigp.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/sigp.h
Extension
.h
Size
1918 bytes
Lines
74
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __S390_ASM_SIGP_H
#define __S390_ASM_SIGP_H

/* SIGP order codes */
#define SIGP_SENSE		      1
#define SIGP_EXTERNAL_CALL	      2
#define SIGP_EMERGENCY_SIGNAL	      3
#define SIGP_START		      4
#define SIGP_STOP		      5
#define SIGP_RESTART		      6
#define SIGP_STOP_AND_STORE_STATUS    9
#define SIGP_INITIAL_CPU_RESET	     11
#define SIGP_CPU_RESET		     12
#define SIGP_SET_PREFIX		     13
#define SIGP_STORE_STATUS_AT_ADDRESS 14
#define SIGP_SET_ARCHITECTURE	     18
#define SIGP_COND_EMERGENCY_SIGNAL   19
#define SIGP_SENSE_RUNNING	     21
#define SIGP_SET_MULTI_THREADING     22
#define SIGP_STORE_ADDITIONAL_STATUS 23

/* SIGP condition codes */
#define SIGP_CC_ORDER_CODE_ACCEPTED 0
#define SIGP_CC_STATUS_STORED	    1
#define SIGP_CC_BUSY		    2
#define SIGP_CC_NOT_OPERATIONAL	    3

/* SIGP cpu status bits */

#define SIGP_STATUS_INVALID_ORDER	0x00000002UL
#define SIGP_STATUS_CHECK_STOP		0x00000010UL
#define SIGP_STATUS_STOPPED		0x00000040UL
#define SIGP_STATUS_EXT_CALL_PENDING	0x00000080UL
#define SIGP_STATUS_INVALID_PARAMETER	0x00000100UL
#define SIGP_STATUS_INCORRECT_STATE	0x00000200UL
#define SIGP_STATUS_NOT_RUNNING		0x00000400UL

#ifndef __ASSEMBLER__

#include <asm/asm.h>

static inline int ____pcpu_sigp(u16 addr, u8 order, unsigned long parm,
				u32 *status)
{
	union register_pair r1 = { .odd = parm, };
	int cc;

	asm volatile(
		"	sigp	%[r1],%[addr],0(%[order])\n"
		CC_IPM(cc)
		: CC_OUT(cc, cc), [r1] "+d" (r1.pair)
		: [addr] "d" (addr), [order] "a" (order)
		: CC_CLOBBER);
	*status = r1.even;
	return CC_TRANSFORM(cc);
}

static inline int __pcpu_sigp(u16 addr, u8 order, unsigned long parm,
			      u32 *status)
{
	u32 _status;
	int cc;

	cc = ____pcpu_sigp(addr, order, parm, &_status);
	if (status && cc == SIGP_CC_STATUS_STORED)
		*status = _status;
	return cc;
}

#endif /* __ASSEMBLER__ */

#endif /* __S390_ASM_SIGP_H */

Annotation

Implementation Notes