arch/powerpc/lib/memcpy_power7.S
Source file repositories/reference/linux-study-clean/arch/powerpc/lib/memcpy_power7.S
File Facts
- System
- Linux kernel
- Corpus path
arch/powerpc/lib/memcpy_power7.S- Extension
.S- Size
- 10116 bytes
- Lines
- 634
- Domain
- Architecture Layer
- Bucket
- arch/powerpc
- Inferred role
- Architecture Layer: arch/powerpc
- Status
- atlas-only
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
Dependency Surface
asm/ppc_asm.h
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#include <asm/ppc_asm.h>
#ifndef SELFTEST_CASE
/* 0 == don't use VMX, 1 == use VMX */
#define SELFTEST_CASE 0
#endif
#ifdef __BIG_ENDIAN__
#define LVS(VRT,RA,RB) lvsl VRT,RA,RB
#define VPERM(VRT,VRA,VRB,VRC) vperm VRT,VRA,VRB,VRC
#else
#define LVS(VRT,RA,RB) lvsr VRT,RA,RB
#define VPERM(VRT,VRA,VRB,VRC) vperm VRT,VRB,VRA,VRC
#endif
_GLOBAL(memcpy_power7)
cmpldi r5,16
cmpldi cr1,r5,4096
std r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
blt .Lshort_copy
#ifdef CONFIG_ALTIVEC
test_feature = SELFTEST_CASE
BEGIN_FTR_SECTION
bgt cr1, .Lvmx_copy
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
.Lnonvmx_copy:
/* Get the source 8B aligned */
neg r6,r4
mtocrf 0x01,r6
clrldi r6,r6,(64-3)
bf cr7*4+3,1f
lbz r0,0(r4)
addi r4,r4,1
stb r0,0(r3)
addi r3,r3,1
1: bf cr7*4+2,2f
lhz r0,0(r4)
addi r4,r4,2
sth r0,0(r3)
addi r3,r3,2
2: bf cr7*4+1,3f
lwz r0,0(r4)
addi r4,r4,4
stw r0,0(r3)
addi r3,r3,4
3: sub r5,r5,r6
cmpldi r5,128
blt 5f
mflr r0
stdu r1,-STACKFRAMESIZE(r1)
std r14,STK_REG(R14)(r1)
std r15,STK_REG(R15)(r1)
std r16,STK_REG(R16)(r1)
std r17,STK_REG(R17)(r1)
std r18,STK_REG(R18)(r1)
std r19,STK_REG(R19)(r1)
std r20,STK_REG(R20)(r1)
std r21,STK_REG(R21)(r1)
std r22,STK_REG(R22)(r1)
std r0,STACKFRAMESIZE+16(r1)
srdi r6,r5,7
Annotation
- Immediate include surface: `asm/ppc_asm.h`.
- Atlas domain: Architecture Layer / arch/powerpc.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.