arch/powerpc/include/asm/vphn.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/vphn.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/vphn.h
Extension
.h
Size
802 bytes
Lines
25
Domain
Architecture Layer
Bucket
arch/powerpc
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 _ASM_POWERPC_VPHN_H
#define _ASM_POWERPC_VPHN_H

/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
#define VPHN_REGISTER_COUNT 6

/*
 * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
 * form the complete property we have to add the length in the first cell.
 */
#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)

/*
 * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
 * 1 for retrieving associativity information for a guest cpu
 * 2 for retrieving associativity information for a host/hypervisor cpu
 */
#define VPHN_FLAG_VCPU	1
#define VPHN_FLAG_PCPU	2

long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);

#endif // _ASM_POWERPC_VPHN_H

Annotation

Implementation Notes