arch/xtensa/variants/fsf/include/variant/tie-asm.h

Source file repositories/reference/linux-study-clean/arch/xtensa/variants/fsf/include/variant/tie-asm.h

File Facts

System
Linux kernel
Corpus path
arch/xtensa/variants/fsf/include/variant/tie-asm.h
Extension
.h
Size
2601 bytes
Lines
71
Domain
Architecture Layer
Bucket
arch/xtensa
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 _XTENSA_CORE_TIE_ASM_H
#define _XTENSA_CORE_TIE_ASM_H

/*  Selection parameter values for save-area save/restore macros:  */
/*  Option vs. TIE:  */
#define XTHAL_SAS_TIE	0x0001	/* custom extension or coprocessor */
#define XTHAL_SAS_OPT	0x0002	/* optional (and not a coprocessor) */
/*  Whether used automatically by compiler:  */
#define XTHAL_SAS_NOCC	0x0004	/* not used by compiler w/o special opts/code */
#define XTHAL_SAS_CC	0x0008	/* used by compiler without special opts/code */
/*  ABI handling across function calls:  */
#define XTHAL_SAS_CALR	0x0010	/* caller-saved */
#define XTHAL_SAS_CALE	0x0020	/* callee-saved */
#define XTHAL_SAS_GLOB	0x0040	/* global across function calls (in thread) */
/*  Misc  */
#define XTHAL_SAS_ALL	0xFFFF	/* include all default NCP contents */



/* Macro to save all non-coprocessor (extra) custom TIE and optional state
 * (not including zero-overhead loop registers).
 * Save area ptr (clobbered):  ptr  (1 byte aligned)
 * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
 */
	.macro xchal_ncp_store  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
	xchal_sa_start	\continue, \ofs
	.ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_GLOB) & ~\select
	xchal_sa_align	\ptr, 0, 1024-4, 4, 4
	rur	\at1, THREADPTR		// threadptr option
	s32i	\at1, \ptr, .Lxchal_ofs_ + 0
	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 4
	.endif
	.endm	// xchal_ncp_store

/* Macro to save all non-coprocessor (extra) custom TIE and optional state
 * (not including zero-overhead loop registers).
 * Save area ptr (clobbered):  ptr  (1 byte aligned)
 * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
 */
	.macro xchal_ncp_load  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
	xchal_sa_start	\continue, \ofs
	.ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_GLOB) & ~\select
	xchal_sa_align	\ptr, 0, 1024-4, 4, 4
	l32i	\at1, \ptr, .Lxchal_ofs_ + 0
	wur	\at1, THREADPTR		// threadptr option
	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 4
	.endif
	.endm	// xchal_ncp_load



#define XCHAL_NCP_NUM_ATMPS	1


#define XCHAL_SA_NUM_ATMPS	1

#endif /*_XTENSA_CORE_TIE_ASM_H*/

Annotation

Implementation Notes