arch/s390/include/asm/appldata.h

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

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/appldata.h
Extension
.h
Size
1634 bytes
Lines
70
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

struct appldata_parameter_list {
	u16 diag;
	u8  function;
	u8  parlist_length;
	u32 unused01;
	u16 reserved;
	u16 buffer_length;
	u32 unused02;
	u64 product_id_addr;
	u64 buffer_addr;
} __attribute__ ((packed));

struct appldata_product_id {
	char prod_nr[7];	/* product number */
	u16  prod_fn;		/* product function */
	u8   record_nr; 	/* record number */
	u16  version_nr;	/* version */
	u16  release_nr;	/* release */
	u16  mod_lvl;		/* modification level */
} __attribute__ ((packed));


static inline int appldata_asm(struct appldata_parameter_list *parm_list,
			       struct appldata_product_id *id,
			       unsigned short fn, void *buffer,
			       unsigned short length)
{
	int ry;

	if (!machine_is_vm())
		return -EOPNOTSUPP;
	parm_list->diag = 0xdc;
	parm_list->function = fn;
	parm_list->parlist_length = sizeof(*parm_list);
	parm_list->buffer_length = length;
	parm_list->product_id_addr = virt_to_phys(id);
	parm_list->buffer_addr = virt_to_phys(buffer);
	diag_stat_inc(DIAG_STAT_X0DC);
	asm volatile(
		"	diag	%1,%0,0xdc"
		: "=d" (ry)
		: "d" (virt_to_phys(parm_list)), "m" (*parm_list), "m" (*id)
		: "cc");
	return ry;
}

#endif /* _ASM_S390_APPLDATA_H */

Annotation

Implementation Notes