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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/alpha/boot/head.S
26426 views
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * arch/alpha/boot/head.S

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 *

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 * initial bootloader stuff..

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 */

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#include <asm/pal.h>

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	.set noreorder

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	.globl	__start

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	.ent	__start

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__start:

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	br	$29,2f

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2:	ldgp	$29,0($29)

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	jsr	$26,start_kernel

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	call_pal PAL_halt

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	.end __start

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	.align 5

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	.globl	wrent

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	.ent	wrent

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wrent:

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	.prologue 0

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	call_pal PAL_wrent

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	ret ($26)

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	.end wrent

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	.align 5

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	.globl	wrkgp

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	.ent	wrkgp

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wrkgp:

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	.prologue 0

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	call_pal PAL_wrkgp

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	ret ($26)

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	.end wrkgp

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	.align 5

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	.globl	switch_to_osf_pal

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	.ent	switch_to_osf_pal

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switch_to_osf_pal:

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	subq	$30,128,$30

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	.frame	$30,128,$26

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	stq	$26,0($30)

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	stq	$1,8($30)

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	stq	$2,16($30)

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	stq	$3,24($30)

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	stq	$4,32($30)

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	stq	$5,40($30)

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	stq	$6,48($30)

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	stq	$7,56($30)

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	stq	$8,64($30)

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	stq	$9,72($30)

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	stq	$10,80($30)

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	stq	$11,88($30)

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	stq	$12,96($30)

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	stq	$13,104($30)

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	stq	$14,112($30)

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	stq	$15,120($30)

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	.prologue 0

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	stq	$30,0($17)	/* save KSP in PCB */

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	bis	$30,$30,$20	/* a4 = KSP */

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	br	$17,1f

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	ldq	$26,0($30)

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	ldq	$1,8($30)

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	ldq	$2,16($30)

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	ldq	$3,24($30)

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	ldq	$4,32($30)

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	ldq	$5,40($30)

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	ldq	$6,48($30)

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	ldq	$7,56($30)

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	ldq	$8,64($30)

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	ldq	$9,72($30)

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	ldq	$10,80($30)

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	ldq	$11,88($30)

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	ldq	$12,96($30)

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	ldq	$13,104($30)

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	ldq	$14,112($30)

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	ldq	$15,120($30)

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	addq	$30,128,$30

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	ret ($26)

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1:	call_pal PAL_swppal

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	.end	switch_to_osf_pal

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	.align 3

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	.globl	tbi

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	.ent	tbi

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tbi:

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	.prologue 0

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	call_pal PAL_tbi

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	ret	($26)

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	.end tbi

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	.align 3

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	.globl	halt

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	.ent	halt

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halt:

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	.prologue 0

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	call_pal PAL_halt

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	.end halt

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/* $16 - new stack page */

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	.align 3

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	.globl	move_stack

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	.ent	move_stack

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move_stack:

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	.prologue 0

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	lda	$0, 0x1fff($31)

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	and	$0, $30, $1			/* Stack offset */

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	or	$1, $16, $16			/* New stack pointer */

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	mov	$30, $1

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	mov	$16, $2

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1:	ldq	$3, 0($1)			/* Move the stack */

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	addq	$1, 8, $1

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	stq	$3, 0($2)

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	and	$0, $1, $4

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	addq	$2, 8, $2

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	bne	$4, 1b

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	mov	$16, $30

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	ret	($26)

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	.end move_stack

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