arch/powerpc/kernel/tm.S

Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/tm.S

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kernel/tm.S
Extension
.S
Size
13119 bytes
Lines
555
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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

#include <linux/export.h>
#include <asm/asm-offsets.h>
#include <asm/ppc_asm.h>
#include <asm/ppc-opcode.h>
#include <asm/ptrace.h>
#include <asm/reg.h>
#include <asm/bug.h>
#include <asm/feature-fixups.h>

#ifdef CONFIG_VSX
/* See fpu.S, this is borrowed from there */
#define __SAVE_32FPRS_VSRS(n,c,base)		\
BEGIN_FTR_SECTION				\
	b	2f;				\
END_FTR_SECTION_IFSET(CPU_FTR_VSX);		\
	SAVE_32FPRS(n,base);			\
	b	3f;				\
2:	SAVE_32VSRS(n,c,base);			\
3:
#define __REST_32FPRS_VSRS(n,c,base)		\
BEGIN_FTR_SECTION				\
	b	2f;				\
END_FTR_SECTION_IFSET(CPU_FTR_VSX);		\
	REST_32FPRS(n,base);			\
	b	3f;				\
2:	REST_32VSRS(n,c,base);			\
3:
#else
#define __SAVE_32FPRS_VSRS(n,c,base)	SAVE_32FPRS(n, base)
#define __REST_32FPRS_VSRS(n,c,base)	REST_32FPRS(n, base)
#endif
#define SAVE_32FPRS_VSRS(n,c,base) \
	__SAVE_32FPRS_VSRS(n,__REG_##c,__REG_##base)
#define REST_32FPRS_VSRS(n,c,base) \
	__REST_32FPRS_VSRS(n,__REG_##c,__REG_##base)

/* Stack frame offsets for local variables. */
#define TM_FRAME_L0	TM_FRAME_SIZE-16
#define TM_FRAME_L1	TM_FRAME_SIZE-8


/* In order to access the TM SPRs, TM must be enabled.  So, do so: */
_GLOBAL(tm_enable)
	mfmsr	r4
	li	r3, MSR_TM >> 32
	sldi	r3, r3, 32
	and.	r0, r4, r3
	bne	1f
	or	r4, r4, r3
	mtmsrd	r4
1:	blr
EXPORT_SYMBOL_GPL(tm_enable);

_GLOBAL(tm_disable)
	mfmsr	r4
	li	r3, MSR_TM >> 32
	sldi	r3, r3, 32
	andc	r4, r4, r3
	mtmsrd	r4
	blr
EXPORT_SYMBOL_GPL(tm_disable);

_GLOBAL(tm_save_sprs)
	mfspr	r0, SPRN_TFHAR
	std	r0, THREAD_TM_TFHAR(r3)
	mfspr	r0, SPRN_TEXASR
	std	r0, THREAD_TM_TEXASR(r3)
	mfspr	r0, SPRN_TFIAR
	std	r0, THREAD_TM_TFIAR(r3)
	blr

Annotation

Implementation Notes