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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/memmapasm.h> |
31 | 31 | ||
32 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
32 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
33 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
33 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
34 | E820_SMAP = 0x534d4150 |
34 | E820_SMAP = 0x534d4150 |
35 | 35 | ||
36 | .global memmap_arch_init |
36 | .global memmap_arch_init |
- | 37 | .global e820counter |
|
- | 38 | .global e820table |
|
- | 39 | .global e801memorysize |
|
37 | 40 | ||
38 | .code16 |
41 | .code16 |
39 | .section K_TEXT_START_2 |
42 | .section K_TEXT_START_2 |
40 | 43 | ||
41 | memmap_arch_init: |
44 | memmap_arch_init: |
42 | 45 | ||
43 | e820begin: |
46 | e820begin: |
44 | xorl %ebx,%ebx # during first call, ebx must be 0 |
47 | xorl %ebx,%ebx # during first call, ebx must be 0 |
- | 48 | movw %bx,%ds |
|
45 | 49 | movw %bx,%es |
|
46 | movw $e820table,%di |
50 | movw $e820table,%di |
47 | movb $E820_MAX_RECORDS,(e820counter) |
51 | movb $E820_MAX_RECORDS,(e820counter) |
48 | e820loop: |
52 | e820loop: |
49 | movl $E820_SMAP,%edx # constrol sequence "SMAP" |
53 | movl $E820_SMAP,%edx # control sequence "SMAP" |
50 | pushw %ds |
- | |
51 | popw %es # e820 buffer address |
- | |
52 | 54 | ||
53 | movl $0xe820,%eax # service |
55 | movl $0x0000e820,%eax # service |
54 | movl $E820_RECORD_SIZE,%ecx |
56 | movl $E820_RECORD_SIZE,%ecx |
55 | int $0x15 |
57 | int $0x15 |
56 | jc e820end |
58 | jc e820err |
57 | - | ||
58 | 59 | ||
59 | cmpl $E820_SMAP,%eax # verifying BIOS |
60 | cmpl $E820_SMAP,%eax # verifying BIOS |
60 | jne e820end |
61 | jne e820err |
- | 62 | ||
- | 63 | cmpl $E820_RECORD_SIZE,%ecx |
|
- | 64 | jne e820err # bad record size - bug in bios |
|
61 | 65 | ||
62 | movw %di,%ax # next record |
66 | movw %di,%ax # next record |
63 | addw $E820_RECORD_SIZE,%ax |
67 | addw $E820_RECORD_SIZE,%ax |
64 | movw %ax,%di |
68 | movw %ax,%di |
65 | 69 | ||
66 | decb (e820counter) # buffer is full |
70 | decb (e820counter) # buffer is full |
67 | jz e820end |
71 | jz e820end |
68 | 72 | ||
69 | cmpl $0,%ebx |
73 | cmpl $0,%ebx |
70 | jne e820loop |
74 | jne e820loop |
71 | 75 | ||
72 | e820end: |
76 | e820end: |
73 | - | ||
74 | movb (e820counter),%al |
77 | movb $E820_MAX_RECORDS,%al |
75 | negb %al |
- | |
76 | addb $32,%al |
78 | subb (e820counter),%al |
77 | movb %al,(e820counter) # store # of valid entries in e820counter |
79 | movb %al,(e820counter) # store # of valid entries in e820counter |
- | 80 | ||
- | 81 | jmp e801begin |
|
- | 82 | ||
- | 83 | e820err: |
|
- | 84 | movb $0,(e820counter) |
|
- | 85 | ||
- | 86 | # method e801 - get size of memory |
|
- | 87 | ||
- | 88 | e801begin: |
|
- | 89 | xorw %dx,%dx |
|
- | 90 | xorw %cx,%cx |
|
- | 91 | xorw %bx,%bx |
|
- | 92 | movw $0xe801,%ax |
|
- | 93 | stc |
|
- | 94 | int $0x15 |
|
- | 95 | ||
- | 96 | jc e801end |
|
78 | 97 | ||
- | 98 | # fix problem with some BIOSes which use ax:bx rather than cx:dx |
|
- | 99 | testw %cx,%cx |
|
- | 100 | jnz e801cxdx |
|
- | 101 | testw %dx,%dx |
|
- | 102 | jnz e801cxdx |
|
- | 103 | ||
- | 104 | movw %ax,%cx |
|
- | 105 | movw %bx,%dx |
|
- | 106 | ||
- | 107 | e801cxdx: |
|
- | 108 | andl $0xffff,%edx |
|
- | 109 | shll $6,%edx |
|
- | 110 | andl $0xffff,%ecx |
|
- | 111 | addl %ecx,%edx |
|
- | 112 | addl $0x0400,%edx # add lower 1 MB - its not count by e801 method |
|
- | 113 | movl %edx,(e801memorysize) |
|
- | 114 | e801end: |
|
79 | ret |
115 | ret |
80 | 116 | ||
- | 117 | #memory size in 1 kb chunks |
|
- | 118 | e801memorysize: |
|
- | 119 | .long 0 |
|
81 | 120 | ||
82 | e820counter: |
121 | e820counter: |
83 | .byte 0 |
122 | .byte 0xff |
84 | 123 | ||
85 | e820table: |
124 | e820table: |
86 | .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |
125 | .space (32*E820_RECORD_SIZE),0xff # space for 32 records, each E820_RECORD_SIZE bytes long |
87 | 126 |