mirror of
https://github.com/xcat2/xNBA.git
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BIOS floppy handling code moved to where it will really live.
This commit is contained in:
Michael Brown
parent
10b7b1a61f
commit
fcee25024f
@ -1,88 +1,28 @@
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#if (TRY_FLOPPY_FIRST > 0)
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#include "console.h"
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#include "disk.h"
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#include "bios_disks.h"
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*/
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#include "etherboot.h"
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#define BOOTSECT ((char *)0x7C00)
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#define BOOTSIG ((unsigned short *)BOOTSECT)[0xFF]
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#define PARTTAB ((partentry *)(BOOTSECT+0x1BE))
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typedef struct partentry {
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unsigned char flags;
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unsigned char start_head;
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unsigned char start_sector;
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unsigned char start_cylinder;
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unsigned char type;
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unsigned char end_head;
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unsigned char end_sector;
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unsigned char end_cylinder;
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unsigned long offset;
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unsigned long length;
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} partentry;
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static unsigned int disk_read_retry(int dev,int c,int h,int s)
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{
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int retry = 3,rc;
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while (retry-- && (rc = pcbios_disk_read(dev,c,h,s,BOOTSECT)) != 0);
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if (BOOTSIG != 0xAA55) {
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printf("not a boot sector");
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return(0xFFFF); }
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return(rc);
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static void fill_floppy_name ( char *buf, uint8_t drive ) {
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sprintf ( buf, "fd%d", drive );
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}
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int bootdisk(int dev,int part)
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{
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int rc;
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static struct disk_operations floppy_operations = {
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disk_init();
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if ((rc = disk_read_retry(dev,0,0,1)) != 0) {
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readerr:
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if (rc != 0xFFFF)
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printf("read error (%#hhX)",rc/256);
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return(0); }
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if (part) {
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partentry *ptr;
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};
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if (part >= 5) {
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int i;
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for (i = 0, ptr = PARTTAB; ptr->type != 5; ptr++)
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if (++i == 4) {
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printf("partition not found");
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return(0); }
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if ((rc = disk_read_retry(dev,
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ptr->start_cylinder,
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ptr->start_head,
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ptr->start_sector)) != 0)
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goto readerr;
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part -= 4; }
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if (!(ptr = PARTTAB-1+part)->type) {
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printf("empty partition");
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return(0); }
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if ((rc = disk_read_retry(dev,
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ptr->start_cylinder,
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ptr->start_head,
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ptr->start_sector)) != 0)
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goto readerr; }
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cleanup();
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gateA20_unset();
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/* Set %edx to device number to emulate BIOS
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Fortunately %edx is not used after this */
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__asm__("movl %0,%%edx" : : "g" (dev));
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xstart((unsigned long)BOOTSECT, 0, 0);
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return(0);
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static int floppy_probe ( struct disk *disk,
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struct bios_disk_device *bios_disk ) {
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return 1;
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}
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#endif
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static void floppy_disable ( struct disk *disk,
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struct bios_disk_device *bios_disk ) {
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}
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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static struct bios_disk_driver floppy_driver =
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BIOS_DISK_DRIVER ( fill_floppy_name, 0x00, 0x7f );
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DRIVER ( "floppy", disk_driver, bios_disk_driver, floppy_driver,
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floppy_probe, floppy_disable );
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68
src/arch/i386/include/bios_disks.h
Normal file
68
src/arch/i386/include/bios_disks.h
Normal file
@ -0,0 +1,68 @@
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#ifndef BIOS_DISKS_H
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#define BIOS_DISKS_H
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#include "dev.h"
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/*
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* Constants
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*
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*/
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#define BIOS_DISK_MAX_NAME_LEN 6
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struct bios_disk_sector {
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char data[512];
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};
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/*
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* The location of a BIOS disk
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*
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*/
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struct bios_disk_loc {
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uint8_t drive;
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};
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/*
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* A physical BIOS disk device
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*
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*/
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struct bios_disk_device {
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char name[BIOS_DISK_MAX_NAME_LEN];
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uint8_t drive;
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uint8_t type;
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};
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/*
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* A BIOS disk driver, with a valid device ID range and naming
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* function.
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*
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*/
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struct bios_disk_driver {
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void ( *fill_drive_name ) ( char *buf, uint8_t drive );
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uint8_t min_drive;
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uint8_t max_drive;
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};
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/*
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* Define a BIOS disk driver
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*
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*/
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#define BIOS_DISK_DRIVER( _fill_drive_name, _min_drive, _max_drive ) { \
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.fill_drive_name = _fill_drive_name, \
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.min_drive = _min_drive, \
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.max_drive = _max_drive, \
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}
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/*
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* Functions in bios_disks.c
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*
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*/
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/*
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* bios_disk bus global definition
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*
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*/
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extern struct bus_driver bios_disk_driver;
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#endif /* BIOS_DISKS_H */
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@ -1,6 +1,7 @@
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#ifndef DISK_H
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#define DISK_H
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#include "etherboot.h" /* for sector_t */
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#include "dev.h"
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/*
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@ -30,6 +31,9 @@ struct disk
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int direction;
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};
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struct disk_operations {
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};
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extern struct disk disk;
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extern int url_file(const char *name,
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int (*fnc)(unsigned char *, unsigned int, unsigned int, int));
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@ -39,6 +43,7 @@ extern int disk_load_configuration(struct dev *dev);
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extern int disk_load(struct dev *dev);
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extern void disk_disable(void);
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extern struct type_driver disk_driver;
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#ifndef DOWNLOAD_PROTO_DISK
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#define disk_disable() do { } while(0)
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