arch/alpha/lib/callback_srm.S

Source file repositories/reference/linux-study-clean/arch/alpha/lib/callback_srm.S

File Facts

System
Linux kernel
Corpus path
arch/alpha/lib/callback_srm.S
Extension
.S
Size
3001 bytes
Lines
110
Domain
Architecture Layer
Bucket
arch/alpha
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/console.h>

.text
#define HWRPB_CRB_OFFSET 0xc0

#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
.align 4
srm_dispatch:
#if defined(CONFIG_ALPHA_GENERIC)
	ldl	$4,alpha_using_srm
	beq	$4,nosrm
#endif
	ldq	$0,hwrpb	# gp is set up by CALLBACK macro.
	ldl	$25,0($25)	# Pick up the wrapper data.
	mov	$20,$21		# Shift arguments right.
	mov	$19,$20
	ldq	$1,HWRPB_CRB_OFFSET($0)
	mov	$18,$19
	mov	$17,$18
	mov	$16,$17
	addq	$0,$1,$2	# CRB address
	ldq	$27,0($2)	# DISPATCH procedure descriptor (VMS call std)
	extwl	$25,0,$16	# SRM callback function code
	ldq	$3,8($27)	# call address
	extwl	$25,2,$25	# argument information (VMS calling std)
	jmp	($3)		# Return directly to caller of wrapper.

.align 4
.globl	srm_fixup
.ent	srm_fixup
srm_fixup:
	ldgp	$29,0($27)
#if defined(CONFIG_ALPHA_GENERIC)
	ldl	$4,alpha_using_srm
	beq	$4,nosrm
#endif
	ldq	$0,hwrpb
	ldq	$1,HWRPB_CRB_OFFSET($0)
	addq	$0,$1,$2	# CRB address
	ldq	$27,16($2)	# VA of FIXUP procedure descriptor
	ldq	$3,8($27)	# call address
	lda	$25,2($31)	# two integer arguments
	jmp	($3)		# Return directly to caller of srm_fixup.
.end    srm_fixup

#if defined(CONFIG_ALPHA_GENERIC)
.align 3
nosrm:
	lda	$0,-1($31)
	ret
#endif

#define CALLBACK(NAME, CODE, ARG_CNT) \
.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME

#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */

#define CALLBACK(NAME, CODE, ARG_CNT) \
.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
lda $0,-1($31); ret; .end callback_##NAME

.align 3
.globl	srm_fixup
.ent	srm_fixup
srm_fixup:
	lda	$0,-1($31)
	ret
.end	srm_fixup

Annotation

Implementation Notes