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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/m68k/kernel/sun3-head.S
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/* SPDX-License-Identifier: GPL-2.0 */

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#include <linux/linkage.h>

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#include <linux/init.h>

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#include <asm/entry.h>

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#include <asm/page.h>

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#include <asm/contregs.h>

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#include <asm/sun3-head.h>

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PSL_HIGHIPL     = 0x2700

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NBSG            = 0x20000

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ICACHE_ONLY	= 0x00000009

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CACHES_OFF	= 0x00000008	| actually a clear and disable --m

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#define MAS_STACK INT_STACK

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ROOT_TABLE_SIZE = 128

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PAGESIZE	= 8192

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SUN3_INVALID_PMEG = 255

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.globl bootup_user_stack

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.globl bootup_kernel_stack

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.globl pg0

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.globl swapper_pg_dir

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.globl kernel_pmd_table

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.globl availmem

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.global m68k_pgtable_cachemode

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.global kpt

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| todo: all these should be in bss!

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swapper_pg_dir:                .skip 0x2000

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pg0:                           .skip 0x2000

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kernel_pmd_table:              .skip 0x2000

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.globl kernel_pg_dir

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.equ    kernel_pg_dir,kernel_pmd_table

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	__HEAD

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ENTRY(_stext)

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ENTRY(_start)

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/* Firstly, disable interrupts and set up function codes. */

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	movew	#PSL_HIGHIPL, %sr

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	moveq	#FC_CONTROL, %d0

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	movec	%d0, %sfc

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	movec	%d0, %dfc

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/* Make sure we're in context zero. */

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	moveq	#0, %d0

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	movsb	%d0, AC_CONTEXT

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/* map everything the bootloader left us into high memory, clean up the

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   excess later */

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	lea	(AC_SEGMAP+0),%a0

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	lea	(AC_SEGMAP+KERNBASE),%a1

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1:

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	movsb	%a0@, %d1

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	movsb	%d1, %a1@

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	cmpib	#SUN3_INVALID_PMEG, %d1

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	beq	2f

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	addl	#NBSG,%a0

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	addl	#NBSG,%a1

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	jmp	1b

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2:

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/* Disable caches and jump to high code. */

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	moveq	#ICACHE_ONLY,%d0	| Cache disabled until we're ready to enable it

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	movc	%d0, %cacr	|   is this the right value? (yes --m)

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	jmp	1f:l

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/* Following code executes at high addresses (0xE000xxx). */

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1:	lea	init_task,%curptr			| get initial thread...

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	lea	init_thread_union+THREAD_SIZE,%sp	| ...and its stack.

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/* Point MSP at an invalid page to trap if it's used. --m */

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	movl	#(PAGESIZE),%d0

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	movc	%d0,%msp

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	moveq	#-1,%d0

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	movsb	%d0,(AC_SEGMAP+0x0)

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	jbsr	sun3_init

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	jbsr	base_trap_init

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        jbsr    start_kernel

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	trap	#15

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        .data

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        .even

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kpt:

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        .long 0

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availmem:

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        .long 0

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