Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/kernel/sun3-head.S
10820 views
1
#include <linux/linkage.h>

2
#include <linux/init.h>

3


4
#include <asm/entry.h>

5
#include <asm/page.h>

6
#include <asm/contregs.h>

7
#include <asm/sun3-head.h>

8


9
PSL_HIGHIPL     = 0x2700

10
NBSG            = 0x20000

11
ICACHE_ONLY	= 0x00000009

12
CACHES_OFF	= 0x00000008	| actually a clear and disable --m

13
#define MAS_STACK INT_STACK

14
ROOT_TABLE_SIZE = 128

15
PAGESIZE	= 8192

16
SUN3_INVALID_PMEG = 255

17
.globl bootup_user_stack

18
.globl bootup_kernel_stack

19
.globl pg0

20
.globl swapper_pg_dir

21
.globl kernel_pmd_table

22
.globl availmem

23
.global m68k_pgtable_cachemode

24
.global kpt

25
| todo: all these should be in bss!

26
swapper_pg_dir:                .skip 0x2000

27
pg0:                           .skip 0x2000

28
kernel_pmd_table:              .skip 0x2000

29


30
.globl kernel_pg_dir

31
.equ    kernel_pg_dir,kernel_pmd_table

32


33
	__HEAD

34
ENTRY(_stext)

35
ENTRY(_start)

36


37
/* Firstly, disable interrupts and set up function codes. */

38
	movew	#PSL_HIGHIPL, %sr

39
	moveq	#FC_CONTROL, %d0

40
	movec	%d0, %sfc

41
	movec	%d0, %dfc

42


43
/* Make sure we're in context zero. */

44
	moveq	#0, %d0

45
	movsb	%d0, AC_CONTEXT

46


47
/* map everything the bootloader left us into high memory, clean up the

48
   excess later */

49
	lea	(AC_SEGMAP+0),%a0

50
	lea	(AC_SEGMAP+KERNBASE),%a1

51
1:

52
	movsb	%a0@, %d1

53
	movsb	%d1, %a1@

54
	cmpib	#SUN3_INVALID_PMEG, %d1

55
	beq	2f

56
	addl	#NBSG,%a0

57
	addl	#NBSG,%a1

58
	jmp	1b

59


60
2:

61


62
/* Disable caches and jump to high code. */

63
	moveq	#ICACHE_ONLY,%d0	| Cache disabled until we're ready to enable it

64
	movc	%d0, %cacr	|   is this the right value? (yes --m)

65
	jmp	1f:l

66


67
/* Following code executes at high addresses (0xE000xxx). */

68
1:	lea	init_task,%curptr			| get initial thread...

69
	lea	init_thread_union+THREAD_SIZE,%sp	| ...and its stack.

70


71
/* Point MSP at an invalid page to trap if it's used. --m */

72
	movl	#(PAGESIZE),%d0

73
	movc	%d0,%msp

74
	moveq	#-1,%d0

75
	movsb	%d0,(AC_SEGMAP+0x0)

76


77
	jbsr	sun3_init

78


79
	jbsr	base_trap_init

80


81
        jbsr    start_kernel

82
	trap	#15

83


84
        .data

85
        .even

86
kpt:

87
        .long 0

88
availmem:

89
        .long 0

90
| todo: remove next two. --m

91
is_medusa:

92
        .long 0

93
m68k_pgtable_cachemode:

94
        .long 0

95


96


97