Subversion Repositories HelenOS-historic

Rev

Rev 895 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 895 Rev 1777
Line 41... Line 41...
41 
 * the kernel relocates itself to its VMA.
 41 
 * the kernel relocates itself to its VMA.
42 
 */
 42 
 */
43 
 
 43 
 
44 
.global kernel_image_start
 44 
.global kernel_image_start
45 
kernel_image_start:
 45 
kernel_image_start:
46 
0:
 - 
 
47 
	b 1f
 - 
 
48 
	nop
 - 
 
49 
 
 - 
 
50 
/*
 - 
 
51 
 * This header forces SILO to load the kernel at 0x4000.
 - 
 
52 
 * More precisely, SILO will think this is an old version of Linux.
 - 
 
53 
 */
 - 
 
54 
.ascii "HdrS"
 - 
 
55 
.word 0
 - 
 
56 
.half 0
 - 
 
57 
 
 - 
 
58 
.align 8
 - 
 
59 
 
 - 
 
60 
1:
 - 
 
61 
	flushw				! flush all but the active register window
 46 
	flushw				! flush all but the active register window
62 
 
 47 
 
63 
	/*
 - 
 
64 
	 * Prepare to copy the kernel image to 4M.
 - 
 
65 
	 */
 - 
 
66 
 
 - 
 
67 
	set LMA, %g1			! source address
 - 
 
68 
	set VMA, %g2			! destination address
 - 
 
69 
	set hardcoded_ktext_size, %g3	! link address of hardcoded_ktext_size
 - 
 
70 
	set hardcoded_kdata_size, %g4	! link address of hardcoded_kdata_size
 - 
 
71 
 
 - 
 
72 
	sub %g3, %g2, %g3		! offset of hardcoded_ktext_size from the beginning of the load address
 - 
 
73 
	sub %g4, %g2, %g4		! offset of hardcoded_kdata_size from the beginning of the load address
 - 
 
74
- 
 
75 
	ldx [%g3 + %g1], %g3		! hardcoded_ktext_size -> %g3
 - 
 
76 
	ldx [%g4 + %g1], %g4		! hardcoded_kdata_size -> %g4
 - 
 
77 
 
 - 
 
78 
	add %g3, %g4, %g3		! size of kernel text and data
 - 
 
79 
 
 - 
 
80 
	/*
 - 
 
81 
	 * Start copying the kernel from higher addresses towards lower addresses.
 - 
 
82 
	 */
 - 
 
83 
 
 - 
 
84 
2:	dec %g3
 - 
 
85 
	ldub [%g1 + %g3], %g4
 - 
 
86 
	stb %g4, [%g2 + %g3]
 - 
 
87 
	cmp %g3, 0
 - 
 
88 
	bnz 2b
 - 
 
89 
	nop
 - 
 
90 
 
 - 
 
91 
	set relocated, %g1
 - 
 
92 
	jmp %g1
 - 
 
93 
	nop
 - 
 
94 
 
 - 
 
95 
relocated:
 - 
 
96 
	set ofw, %l0
 48 
	set ofw, %l0
97 
 
 49 
 
98 
	call ofw_init
 50 
	call ofw_init
99 
	stx %o4, [%l0]
 51 
	stx %o4, [%l0]
100 
 
 52