91 lines
1.9 KiB
ArmAsm
91 lines
1.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/entry.h>
|
|
#include <asm/page.h>
|
|
#include <asm/contregs.h>
|
|
#include <asm/sun3-head.h>
|
|
|
|
PSL_HIGHIPL = 0x2700
|
|
NBSG = 0x20000
|
|
ICACHE_ONLY = 0x00000009
|
|
CACHES_OFF = 0x00000008 | actually a clear and disable --m
|
|
#define MAS_STACK INT_STACK
|
|
ROOT_TABLE_SIZE = 128
|
|
PAGESIZE = 8192
|
|
SUN3_INVALID_PMEG = 255
|
|
.globl bootup_user_stack
|
|
.globl bootup_kernel_stack
|
|
.globl pg0
|
|
.globl swapper_pg_dir
|
|
.globl kernel_pmd_table
|
|
.globl availmem
|
|
.global m68k_pgtable_cachemode
|
|
.global kpt
|
|
| todo: all these should be in bss!
|
|
swapper_pg_dir: .skip 0x2000
|
|
pg0: .skip 0x2000
|
|
kernel_pmd_table: .skip 0x2000
|
|
|
|
.globl kernel_pg_dir
|
|
.equ kernel_pg_dir,kernel_pmd_table
|
|
|
|
__HEAD
|
|
ENTRY(_stext)
|
|
ENTRY(_start)
|
|
|
|
/* Firstly, disable interrupts and set up function codes. */
|
|
movew #PSL_HIGHIPL, %sr
|
|
moveq #FC_CONTROL, %d0
|
|
movec %d0, %sfc
|
|
movec %d0, %dfc
|
|
|
|
/* Make sure we're in context zero. */
|
|
moveq #0, %d0
|
|
movsb %d0, AC_CONTEXT
|
|
|
|
/* map everything the bootloader left us into high memory, clean up the
|
|
excess later */
|
|
lea (AC_SEGMAP+0),%a0
|
|
lea (AC_SEGMAP+KERNBASE),%a1
|
|
1:
|
|
movsb %a0@, %d1
|
|
movsb %d1, %a1@
|
|
cmpib #SUN3_INVALID_PMEG, %d1
|
|
beq 2f
|
|
addl #NBSG,%a0
|
|
addl #NBSG,%a1
|
|
jmp 1b
|
|
|
|
2:
|
|
|
|
/* Disable caches and jump to high code. */
|
|
moveq #ICACHE_ONLY,%d0 | Cache disabled until we're ready to enable it
|
|
movc %d0, %cacr | is this the right value? (yes --m)
|
|
jmp 1f:l
|
|
|
|
/* Following code executes at high addresses (0xE000xxx). */
|
|
1: lea init_task,%curptr | get initial thread...
|
|
lea init_thread_union+THREAD_SIZE,%sp | ...and its stack.
|
|
|
|
/* Point MSP at an invalid page to trap if it's used. --m */
|
|
movl #(PAGESIZE),%d0
|
|
movc %d0,%msp
|
|
moveq #-1,%d0
|
|
movsb %d0,(AC_SEGMAP+0x0)
|
|
|
|
jbsr sun3_init
|
|
|
|
jbsr base_trap_init
|
|
|
|
jbsr start_kernel
|
|
trap #15
|
|
|
|
.data
|
|
.even
|
|
kpt:
|
|
.long 0
|
|
availmem:
|
|
.long 0
|