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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Josef Cejka |
2 | * Copyright (C) 2005 Josef Cejka |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | 29 | ||
30 | #include <arch/boot/memmap.h> |
30 | #include <arch/boot/memmap.h> |
31 | 31 | ||
32 | .global memmap_arch_init |
- | |
33 | - | ||
34 | .code16 |
- | |
35 | .section K_TEXT_START |
- | |
36 | - | ||
37 | - | ||
38 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
32 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
39 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
33 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
40 | E820_SMAP = 0x534d4150 |
34 | E820_SMAP = 0x534d4150 |
41 | 35 | ||
42 | .global memmap_arch_init |
36 | .global memmap_arch_init |
43 | 37 | ||
44 | .code16 |
38 | .code16 |
45 | .section K_TEXT_START |
39 | .section K_TEXT_START |
46 | 40 | ||
47 | memmap_arch_init: |
41 | memmap_arch_init: |
48 | 42 | ||
49 | e820begin: |
43 | e820begin: |
50 | xorl %ebx,%ebx # during first call, ebx must be 0 |
44 | xorl %ebx,%ebx # during first call, ebx must be 0 |
51 | 45 | ||
52 | movw $e820table,%di |
46 | movw $e820table,%di |
53 | movb $E820_MAX_RECORDS,(e820counter) |
47 | movb $E820_MAX_RECORDS,(e820counter) |
54 | e820loop: |
48 | e820loop: |
55 | movl $E820_SMAP,%edx # constrol sequence "SMAP" |
49 | movl $E820_SMAP,%edx # constrol sequence "SMAP" |
56 | pushw %ds |
50 | pushw %ds |
57 | popw %es # e820 buffer address |
51 | popw %es # e820 buffer address |
58 | 52 | ||
59 | movl $0xe820,%eax # service |
53 | movl $0xe820,%eax # service |
60 | movl $E820_RECORD_SIZE,%ecx |
54 | movl $E820_RECORD_SIZE,%ecx |
61 | int $0x15 |
55 | int $0x15 |
62 | jc e820end |
56 | jc e820end |
63 | 57 | ||
64 | 58 | ||
65 | cmpl $E820_SMAP,%eax # verifying BIOS |
59 | cmpl $E820_SMAP,%eax # verifying BIOS |
66 | jne e820end |
60 | jne e820end |
67 | 61 | ||
68 | movw %di,%ax # next record |
62 | movw %di,%ax # next record |
69 | addw $E820_RECORD_SIZE,%ax |
63 | addw $E820_RECORD_SIZE,%ax |
70 | movw %ax,%di |
64 | movw %ax,%di |
71 | 65 | ||
72 | decb (e820counter) # buffer is full |
66 | decb (e820counter) # buffer is full |
73 | jz e820end |
67 | jz e820end |
74 | 68 | ||
75 | cmpl $0,%ebx |
69 | cmpl $0,%ebx |
76 | jne e820loop |
70 | jne e820loop |
77 | 71 | ||
78 | e820end: |
72 | e820end: |
79 | 73 | ||
80 | movb (e820counter),%al |
74 | movb (e820counter),%al |
81 | negb %al |
75 | negb %al |
82 | addb $32,%al |
76 | addb $32,%al |
83 | movb %al,(e820counter) # store # of valid entries in e820counter |
77 | movb %al,(e820counter) # store # of valid entries in e820counter |
84 | 78 | ||
85 | ret |
79 | ret |
86 | 80 | ||
87 | 81 | ||
88 | e820counter: |
82 | e820counter: |
89 | .byte 0 |
83 | .byte 0 |
90 | 84 | ||
91 | e820table: |
85 | e820table: |
92 | .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |
86 | .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |
93 | 87 |