|
Line
Link Here
|
| 0 |
-- a/stage2/bios.c |
0 |
++ b/stage2/bios.c |
|
Lines 60-66
Link Here
|
| 60 |
unsigned short blocks; |
60 |
unsigned short blocks; |
| 61 |
unsigned long buffer; |
61 |
unsigned long buffer; |
| 62 |
unsigned long long block; |
62 |
unsigned long long block; |
| 63 |
} __attribute__ ((packed)) dap; |
63 |
|
|
|
64 |
/* This structure is passed in the stack. A buggy BIOS could write |
| 65 |
* garbage data to the tail of the struct and hang the machine. So |
| 66 |
* we need this protection. - Tinybit |
| 67 |
*/ |
| 68 |
unsigned char dummy[16]; |
| 69 |
} __attribute__ ((packed)) *dap; |
| 70 |
|
| 71 |
/* Even the above protection is not enough to avoid stupid actions by |
| 72 |
* buggy BIOSes. So we do it in the 0040:0000 segment. - Tinybit |
| 73 |
*/ |
| 74 |
dap = (struct disk_address_packet *)0x580; |
| 64 |
|
75 |
|
| 65 |
/* XXX: Don't check the geometry by default, because some buggy |
76 |
/* XXX: Don't check the geometry by default, because some buggy |
| 66 |
BIOSes don't return the number of total sectors correctly, |
77 |
BIOSes don't return the number of total sectors correctly, |
|
Lines 72-86
Link Here
|
| 72 |
|
83 |
|
| 73 |
/* FIXME: sizeof (DAP) must be 0x10. Should assert that the compiler |
84 |
/* FIXME: sizeof (DAP) must be 0x10. Should assert that the compiler |
| 74 |
can't add any padding. */ |
85 |
can't add any padding. */ |
| 75 |
dap.length = sizeof (dap); |
86 |
dap->length = 0x10; |
| 76 |
dap.block = sector; |
87 |
dap->block = sector; |
| 77 |
dap.blocks = nsec; |
88 |
dap->blocks = nsec; |
| 78 |
dap.reserved = 0; |
89 |
dap->reserved = 0; |
| 79 |
/* This is undocumented part. The address is formated in |
90 |
/* This is undocumented part. The address is formated in |
| 80 |
SEGMENT:ADDRESS. */ |
91 |
SEGMENT:ADDRESS. */ |
| 81 |
dap.buffer = segment << 16; |
92 |
dap->buffer = segment << 16; |
| 82 |
|
93 |
|
| 83 |
err = biosdisk_int13_extensions ((read + 0x42) << 8, drive, &dap); |
94 |
err = biosdisk_int13_extensions ((read + 0x42) << 8, drive, dap); |
| 84 |
|
95 |
|
| 85 |
/* #undef NO_INT13_FALLBACK */ |
96 |
/* #undef NO_INT13_FALLBACK */ |
| 86 |
#ifndef NO_INT13_FALLBACK |
97 |
#ifndef NO_INT13_FALLBACK |
