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- #include "realmode.h"
-
- #define CF ( 1 << 0 )
-
- /**************************************************************************
- DISK_INIT - Initialize the disk system
- **************************************************************************/
- void disk_init ( void ) {
- REAL_EXEC ( rm_disk_init,
- "sti\n\t"
- "xorw %%ax,%%ax\n\t"
- "movb $0x80,%%dl\n\t"
- "int $0x13\n\t"
- "cli\n\t",
- 0,
- OUT_CONSTRAINTS (),
- IN_CONSTRAINTS (),
- CLOBBER ( "eax", "ebx", "ecx", "edx",
- "ebp", "esi", "edi" ) );
- }
-
- /**************************************************************************
- DISK_READ - Read a sector from disk
- **************************************************************************/
- unsigned int pcbios_disk_read ( int drive, int cylinder, int head, int sector,
- char *fixme_buf ) {
- uint16_t ax, flags, discard_c, discard_d;
- segoff_t buf = SEGOFF ( fixme_buf );
-
- /* FIXME: buf should be passed in as a segoff_t rather than a
- * char *
- */
-
- REAL_EXEC ( rm_pcbios_disk_read,
- "sti\n\t"
- "pushl %%ebx\n\t" /* Convert %ebx to %es:bx */
- "popw %%bx\n\t"
- "popw %%es\n\t"
- "movb $0x02, %%ah\n\t" /* INT 13,2 - Read disk sector */
- "movb $0x01, %%al\n\t" /* Read one sector */
- "int $0x13\n\t"
- "pushfw\n\t"
- "popw %%bx\n\t"
- "cli\n\t",
- 4,
- OUT_CONSTRAINTS ( "=a" ( ax ), "=b" ( flags ),
- "=c" ( discard_c ), "=d" ( discard_d ) ),
- IN_CONSTRAINTS ( "c" ( ( ( cylinder & 0xff ) << 8 ) |
- ( ( cylinder >> 8 ) & 0x3 ) |
- sector ),
- "d" ( ( head << 8 ) | drive ),
- "b" ( buf ) ),
- CLOBBER ( "ebp", "esi", "edi" ) );
-
- return ( flags & CF ) ? ax : 0;
- }
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