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We must do "sbb ax, ax" *before* "popf" otherwise it won't be predictable!

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@856 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2004-04-09 23:51:44 +00:00
parent 11e57c64db
commit cfed8c6f29
1 changed files with 10 additions and 10 deletions
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20
sys/sys.c
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@ -29,7 +29,7 @@
#define DEBUG #define DEBUG
/* #define DDEBUG */ /* #define DDEBUG */
#define SYS_VERSION "v3.1" #define SYS_VERSION "v3.2"
#include <stdlib.h> #include <stdlib.h>
#include <dos.h> #include <dos.h>
@ -437,9 +437,9 @@ int absread(int DosDrive, int nsects, int foo, void *diskReadPacket);
#pragma aux absread = \ #pragma aux absread = \
"push bp" \ "push bp" \
"int 0x25" \ "int 0x25" \
"sbb ax, ax" \
"popf" \ "popf" \
"pop bp" \ "pop bp" \
"sbb ax, ax" \
parm [ax] [cx] [dx] [bx] \ parm [ax] [cx] [dx] [bx] \
modify [si di] \ modify [si di] \
value [ax]; value [ax];
@ -448,9 +448,9 @@ int abswrite(int DosDrive, int nsects, int foo, void *diskReadPacket);
#pragma aux abswrite = \ #pragma aux abswrite = \
"push bp" \ "push bp" \
"int 0x26" \ "int 0x26" \
"sbb ax, ax" \
"popf" \ "popf" \
"pop bp" \ "pop bp" \
"sbb ax, ax" \
parm [ax] [cx] [dx] [bx] \ parm [ax] [cx] [dx] [bx] \
modify [si di] \ modify [si di] \
value [ax]; value [ax];
@ -709,6 +709,13 @@ void put_boot(int drive, char *bsFile, char *kernel_name, int load_seg, int both
bs = (struct bootsectortype *)&oldboot; bs = (struct bootsectortype *)&oldboot;
if (bs->bsBytesPerSec != SEC_SIZE)
{
printf("Sector size is not 512 but %d bytes - not currently supported!\n",
bs->bsBytesPerSec);
exit(1); /* Japan?! */
}
{ {
/* see "FAT: General Overview of On-Disk Format" v1.02, 5.V.1999 /* see "FAT: General Overview of On-Disk Format" v1.02, 5.V.1999
* (http://www.nondot.org/sabre/os/files/FileSystems/FatFormat.pdf) * (http://www.nondot.org/sabre/os/files/FileSystems/FatFormat.pdf)
@ -733,13 +740,6 @@ void put_boot(int drive, char *bsFile, char *kernel_name, int load_seg, int both
fs = FAT32; fs = FAT32;
} }
if (bs->bsBytesPerSec != SEC_SIZE)
{
printf("Sector size is not 512 but %d bytes - not currently supported!\n",
bs->bsBytesPerSec);
exit(1); /* Japan?! */
}
/* bit 0 set if function to use current BPB, clear if Device /* bit 0 set if function to use current BPB, clear if Device
BIOS Parameter Block field contains new default BPB BIOS Parameter Block field contains new default BPB
bit 1 set if function to use track layout fields only bit 1 set if function to use track layout fields only