797 lines
18 KiB
C
797 lines
18 KiB
C
/*
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* linux/kernel/hd.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* This is the low-level hd interrupt support. It traverses the
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* request-list, using interrupts to jump between functions. As
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* all the functions are called within interrupts, we may not
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* sleep. Special care is recommended.
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*
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* modified by Drew Eckhardt to check nr of hd's from the CMOS.
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*
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* Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
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* in the early extended-partition checks and added DM partitions
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*/
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/hdreg.h>
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#include <linux/genhd.h>
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#include <linux/config.h>
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#define REALLY_SLOW_IO
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/segment.h>
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#define MAJOR_NR HD_MAJOR
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#include "blk.h"
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#define HD_IRQ 14
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static int revalidate_hddisk(int, int);
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static inline unsigned char CMOS_READ(unsigned char addr)
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{
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outb_p(addr,0x70);
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return inb_p(0x71);
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}
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#define HD_DELAY 0
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#define MAX_ERRORS 16 /* Max read/write errors/sector */
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#define RESET_FREQ 8 /* Reset controller every 8th retry */
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#define RECAL_FREQ 4 /* Recalibrate every 4th retry */
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#define MAX_HD 2
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static void recal_intr(void);
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static void bad_rw_intr(void);
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static char recalibrate[ MAX_HD ] = { 0, };
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static int access_count[MAX_HD] = {0, };
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static char busy[MAX_HD] = {0, };
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static struct wait_queue * busy_wait = NULL;
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static int reset = 0;
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static int hd_error = 0;
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#if (HD_DELAY > 0)
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unsigned long last_req, read_timer();
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#endif
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/*
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* This struct defines the HD's and their types.
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*/
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struct hd_i_struct {
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unsigned int head,sect,cyl,wpcom,lzone,ctl;
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};
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#ifdef HD_TYPE
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struct hd_i_struct hd_info[] = { HD_TYPE };
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static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct)));
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#else
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struct hd_i_struct hd_info[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} };
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static int NR_HD = 0;
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#endif
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static struct hd_struct hd[MAX_HD<<6]={{0,0},};
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static int hd_sizes[MAX_HD<<6] = {0, };
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static int hd_blocksizes[MAX_HD<<6] = {0, };
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#if (HD_DELAY > 0)
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unsigned long read_timer(void)
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{
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unsigned long t;
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int i;
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cli();
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t = jiffies * 11932;
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outb_p(0, 0x43);
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i = inb_p(0x40);
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i |= inb(0x40) << 8;
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sti();
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return(t - i);
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}
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#endif
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void hd_setup(char *str, int *ints)
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{
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int hdind = 0;
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if (ints[0] != 3)
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return;
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if (hd_info[0].head != 0)
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hdind=1;
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hd_info[hdind].head = ints[2];
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hd_info[hdind].sect = ints[3];
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hd_info[hdind].cyl = ints[1];
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hd_info[hdind].wpcom = 0;
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hd_info[hdind].lzone = ints[1];
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hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0);
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NR_HD = hdind+1;
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}
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static int win_result(void)
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{
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int i=inb_p(HD_STATUS);
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if ((i & (BUSY_STAT | READY_STAT | WRERR_STAT | SEEK_STAT | ERR_STAT))
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== (READY_STAT | SEEK_STAT)) {
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hd_error = 0;
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return 0; /* ok */
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}
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printk("HD: win_result: status = 0x%02x\n",i);
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if (i&1) {
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hd_error = inb(HD_ERROR);
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printk("HD: win_result: error = 0x%02x\n",hd_error);
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}
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return 1;
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}
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static int controller_busy(void);
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static int status_ok(void);
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static int controller_ready(unsigned int drive, unsigned int head)
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{
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int retry = 100;
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do {
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if (controller_busy() & BUSY_STAT)
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return 0;
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outb_p(0xA0 | (drive<<4) | head, HD_CURRENT);
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if (status_ok())
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return 1;
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} while (--retry);
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return 0;
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}
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static int status_ok(void)
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{
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unsigned char status = inb_p(HD_STATUS);
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if (status & BUSY_STAT)
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return 1;
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if (status & WRERR_STAT)
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return 0;
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if (!(status & READY_STAT))
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return 0;
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if (!(status & SEEK_STAT))
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return 0;
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return 1;
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}
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static int controller_busy(void)
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{
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int retries = 100000;
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unsigned char status;
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do {
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status = inb_p(HD_STATUS);
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} while ((status & BUSY_STAT) && --retries);
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return status;
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}
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static void hd_out(unsigned int drive,unsigned int nsect,unsigned int sect,
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unsigned int head,unsigned int cyl,unsigned int cmd,
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void (*intr_addr)(void))
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{
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unsigned short port;
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if (drive>1 || head>15)
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panic("Trying to write bad sector");
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#if (HD_DELAY > 0)
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while (read_timer() - last_req < HD_DELAY)
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/* nothing */;
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#endif
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if (reset)
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return;
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if (!controller_ready(drive, head)) {
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reset = 1;
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return;
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}
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SET_INTR(intr_addr);
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outb_p(hd_info[drive].ctl,HD_CMD);
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port=HD_DATA;
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outb_p(hd_info[drive].wpcom>>2,++port);
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outb_p(nsect,++port);
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outb_p(sect,++port);
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outb_p(cyl,++port);
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outb_p(cyl>>8,++port);
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outb_p(0xA0|(drive<<4)|head,++port);
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outb_p(cmd,++port);
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}
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static int drive_busy(void)
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{
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unsigned int i;
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unsigned char c;
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for (i = 0; i < 500000 ; i++) {
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c = inb_p(HD_STATUS);
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c &= (BUSY_STAT | READY_STAT | SEEK_STAT);
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if (c == (READY_STAT | SEEK_STAT))
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return 0;
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}
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printk("HD controller times out, status = 0x%02x\n",c);
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return 1;
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}
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static void reset_controller(void)
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{
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int i;
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printk(KERN_DEBUG "HD-controller reset\n");
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outb_p(4,HD_CMD);
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for(i = 0; i < 1000; i++) nop();
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outb(hd_info[0].ctl & 0x0f ,HD_CMD);
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if (drive_busy())
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printk("HD-controller still busy\n");
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if ((hd_error = inb(HD_ERROR)) != 1)
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printk("HD-controller reset failed: %02x\n",hd_error);
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}
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static void reset_hd(void)
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{
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static int i;
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repeat:
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if (reset) {
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reset = 0;
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i = -1;
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reset_controller();
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} else if (win_result()) {
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bad_rw_intr();
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if (reset)
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goto repeat;
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}
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i++;
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if (i < NR_HD) {
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hd_out(i,hd_info[i].sect,hd_info[i].sect,hd_info[i].head-1,
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hd_info[i].cyl,WIN_SPECIFY,&reset_hd);
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if (reset)
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goto repeat;
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} else
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do_hd_request();
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}
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/*
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* Ok, don't know what to do with the unexpected interrupts: on some machines
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* doing a reset and a retry seems to result in an eternal loop. Right now I
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* ignore it, and just set the timeout.
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*/
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void unexpected_hd_interrupt(void)
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{
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sti();
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printk(KERN_DEBUG "Unexpected HD interrupt\n");
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SET_TIMER;
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}
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/*
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* bad_rw_intr() now tries to be a bit smarter and does things
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* according to the error returned by the controller.
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* -Mika Liljeberg (liljeber@cs.Helsinki.FI)
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*/
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static void bad_rw_intr(void)
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{
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int dev;
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if (!CURRENT)
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return;
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dev = MINOR(CURRENT->dev) >> 6;
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if (++CURRENT->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) {
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end_request(0);
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recalibrate[dev] = 1;
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} else if (CURRENT->errors % RESET_FREQ == 0)
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reset = 1;
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else if ((hd_error & TRK0_ERR) || CURRENT->errors % RECAL_FREQ == 0)
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recalibrate[dev] = 1;
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/* Otherwise just retry */
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}
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static inline int wait_DRQ(void)
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{
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int retries = 100000;
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while (--retries > 0)
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if (inb_p(HD_STATUS) & DRQ_STAT)
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return 0;
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return -1;
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}
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#define STAT_MASK (BUSY_STAT | READY_STAT | WRERR_STAT | SEEK_STAT | ERR_STAT)
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#define STAT_OK (READY_STAT | SEEK_STAT)
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static void read_intr(void)
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{
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int i;
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int retries = 100000;
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do {
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i = (unsigned) inb_p(HD_STATUS);
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if (i & BUSY_STAT)
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continue;
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if ((i & STAT_MASK) != STAT_OK)
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break;
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if (i & DRQ_STAT)
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goto ok_to_read;
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} while (--retries > 0);
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sti();
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printk("HD: read_intr: status = 0x%02x\n",i);
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if (i & ERR_STAT) {
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hd_error = (unsigned) inb(HD_ERROR);
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printk("HD: read_intr: error = 0x%02x\n",hd_error);
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}
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bad_rw_intr();
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cli();
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do_hd_request();
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return;
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ok_to_read:
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insw(HD_DATA,CURRENT->buffer,256);
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CURRENT->errors = 0;
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CURRENT->buffer += 512;
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CURRENT->sector++;
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i = --CURRENT->nr_sectors;
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--CURRENT->current_nr_sectors;
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#ifdef DEBUG
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printk("hd%d : sector = %d, %d remaining to buffer = %08x\n",
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MINOR(CURRENT->dev), CURRENT->sector, i, CURRENT->
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buffer);
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#endif
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if (!i || (CURRENT->bh && !SUBSECTOR(i)))
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end_request(1);
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if (i > 0) {
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SET_INTR(&read_intr);
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sti();
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return;
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}
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(void) inb_p(HD_STATUS);
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#if (HD_DELAY > 0)
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last_req = read_timer();
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#endif
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do_hd_request();
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return;
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}
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static void write_intr(void)
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{
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int i;
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int retries = 100000;
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do {
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i = (unsigned) inb_p(HD_STATUS);
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if (i & BUSY_STAT)
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continue;
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if ((i & STAT_MASK) != STAT_OK)
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break;
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if ((CURRENT->nr_sectors <= 1) || (i & DRQ_STAT))
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goto ok_to_write;
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} while (--retries > 0);
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sti();
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printk("HD: write_intr: status = 0x%02x\n",i);
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if (i & ERR_STAT) {
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hd_error = (unsigned) inb(HD_ERROR);
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printk("HD: write_intr: error = 0x%02x\n",hd_error);
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}
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bad_rw_intr();
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cli();
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do_hd_request();
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return;
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ok_to_write:
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CURRENT->sector++;
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i = --CURRENT->nr_sectors;
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--CURRENT->current_nr_sectors;
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CURRENT->buffer += 512;
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if (!i || (CURRENT->bh && !SUBSECTOR(i)))
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end_request(1);
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if (i > 0) {
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SET_INTR(&write_intr);
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outsw(HD_DATA,CURRENT->buffer,256);
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sti();
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} else {
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#if (HD_DELAY > 0)
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last_req = read_timer();
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#endif
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do_hd_request();
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}
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return;
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}
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static void recal_intr(void)
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{
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if (win_result())
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bad_rw_intr();
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do_hd_request();
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}
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/*
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* This is another of the error-routines I don't know what to do with. The
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* best idea seems to just set reset, and start all over again.
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*/
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static void hd_times_out(void)
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{
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DEVICE_INTR = NULL;
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sti();
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reset = 1;
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if (!CURRENT)
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return;
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printk(KERN_DEBUG "HD timeout\n");
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cli();
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if (++CURRENT->errors >= MAX_ERRORS) {
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#ifdef DEBUG
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printk("hd : too many errors.\n");
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#endif
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end_request(0);
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}
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do_hd_request();
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}
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/*
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* The driver has been modified to enable interrupts a bit more: in order to
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* do this we first (a) disable the timeout-interrupt and (b) clear the
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* device-interrupt. This way the interrupts won't mess with out code (the
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* worst that can happen is that an unexpected HD-interrupt comes in and
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* sets the "reset" variable and starts the timer)
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*/
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static void do_hd_request(void)
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{
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unsigned int block,dev;
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unsigned int sec,head,cyl,track;
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unsigned int nsect;
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if (CURRENT && CURRENT->dev < 0) return;
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if (DEVICE_INTR)
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return;
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repeat:
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timer_active &= ~(1<<HD_TIMER);
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sti();
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INIT_REQUEST;
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dev = MINOR(CURRENT->dev);
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block = CURRENT->sector;
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nsect = CURRENT->nr_sectors;
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if (dev >= (NR_HD<<6) || block >= hd[dev].nr_sects) {
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#ifdef DEBUG
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printk("hd%d : attempted read for sector %d past end of device at sector %d.\n",
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block, hd[dev].nr_sects);
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#endif
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end_request(0);
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goto repeat;
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}
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block += hd[dev].start_sect;
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dev >>= 6;
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sec = block % hd_info[dev].sect + 1;
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track = block / hd_info[dev].sect;
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head = track % hd_info[dev].head;
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cyl = track / hd_info[dev].head;
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#ifdef DEBUG
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printk("hd%d : cyl = %d, head = %d, sector = %d, buffer = %08x\n",
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dev, cyl, head, sec, CURRENT->buffer);
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#endif
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cli();
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if (reset) {
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int i;
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for (i=0; i < NR_HD; i++)
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recalibrate[i] = 1;
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reset_hd();
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sti();
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return;
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}
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if (recalibrate[dev]) {
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recalibrate[dev] = 0;
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hd_out(dev,hd_info[dev].sect,0,0,0,WIN_RESTORE,&recal_intr);
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if (reset)
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goto repeat;
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sti();
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return;
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}
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if (CURRENT->cmd == WRITE) {
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hd_out(dev,nsect,sec,head,cyl,WIN_WRITE,&write_intr);
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if (reset)
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goto repeat;
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if (wait_DRQ()) {
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printk("HD: do_hd_request: no DRQ\n");
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bad_rw_intr();
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goto repeat;
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}
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outsw(HD_DATA,CURRENT->buffer,256);
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sti();
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return;
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}
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if (CURRENT->cmd == READ) {
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hd_out(dev,nsect,sec,head,cyl,WIN_READ,&read_intr);
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if (reset)
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goto repeat;
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sti();
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return;
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}
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panic("unknown hd-command");
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}
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static int hd_ioctl(struct inode * inode, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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struct hd_geometry *loc = (struct hd_geometry *) arg;
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int dev, err;
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if (!inode)
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return -EINVAL;
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dev = MINOR(inode->i_rdev) >> 6;
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if (dev >= NR_HD)
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return -EINVAL;
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switch (cmd) {
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case HDIO_GETGEO:
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if (!loc) return -EINVAL;
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err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
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if (err)
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return err;
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put_fs_byte(hd_info[dev].head,
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(char *) &loc->heads);
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put_fs_byte(hd_info[dev].sect,
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(char *) &loc->sectors);
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put_fs_word(hd_info[dev].cyl,
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(short *) &loc->cylinders);
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put_fs_long(hd[MINOR(inode->i_rdev)].start_sect,
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(long *) &loc->start);
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return 0;
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case BLKGETSIZE: /* Return device size */
|
|
if (!arg) return -EINVAL;
|
|
err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
|
|
if (err)
|
|
return err;
|
|
put_fs_long(hd[MINOR(inode->i_rdev)].nr_sects,
|
|
(long *) arg);
|
|
return 0;
|
|
case BLKFLSBUF:
|
|
if(!suser()) return -EACCES;
|
|
if(!inode->i_rdev) return -EINVAL;
|
|
fsync_dev(inode->i_rdev);
|
|
invalidate_buffers(inode->i_rdev);
|
|
return 0;
|
|
|
|
case BLKRRPART: /* Re-read partition tables */
|
|
return revalidate_hddisk(inode->i_rdev, 1);
|
|
RO_IOCTLS(inode->i_rdev,arg);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int hd_open(struct inode * inode, struct file * filp)
|
|
{
|
|
int target;
|
|
target = DEVICE_NR(MINOR(inode->i_rdev));
|
|
|
|
while (busy[target])
|
|
sleep_on(&busy_wait);
|
|
access_count[target]++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Releasing a block device means we sync() it, so that it can safely
|
|
* be forgotten about...
|
|
*/
|
|
static void hd_release(struct inode * inode, struct file * file)
|
|
{
|
|
int target;
|
|
sync_dev(inode->i_rdev);
|
|
|
|
target = DEVICE_NR(MINOR(inode->i_rdev));
|
|
access_count[target]--;
|
|
|
|
}
|
|
|
|
static void hd_geninit(void);
|
|
|
|
static struct gendisk hd_gendisk = {
|
|
MAJOR_NR, /* Major number */
|
|
"hd", /* Major name */
|
|
6, /* Bits to shift to get real from partition */
|
|
1 << 6, /* Number of partitions per real */
|
|
MAX_HD, /* maximum number of real */
|
|
hd_geninit, /* init function */
|
|
hd, /* hd struct */
|
|
hd_sizes, /* block sizes */
|
|
0, /* number */
|
|
(void *) hd_info, /* internal */
|
|
NULL /* next */
|
|
};
|
|
|
|
static void hd_interrupt(int unused)
|
|
{
|
|
void (*handler)(void) = DEVICE_INTR;
|
|
|
|
DEVICE_INTR = NULL;
|
|
timer_active &= ~(1<<HD_TIMER);
|
|
if (!handler)
|
|
handler = unexpected_hd_interrupt;
|
|
handler();
|
|
sti();
|
|
}
|
|
|
|
/*
|
|
* This is the harddisk IRQ description. The SA_INTERRUPT in sa_flags
|
|
* means we run the IRQ-handler with interrupts disabled: this is bad for
|
|
* interrupt latency, but anything else has led to problems on some
|
|
* machines...
|
|
*
|
|
* We enable interrupts in some of the routines after making sure it's
|
|
* safe.
|
|
*/
|
|
static struct sigaction hd_sigaction = {
|
|
hd_interrupt,
|
|
0,
|
|
SA_INTERRUPT,
|
|
NULL
|
|
};
|
|
|
|
static void hd_geninit(void)
|
|
{
|
|
int drive, i;
|
|
extern struct drive_info drive_info;
|
|
unsigned char *BIOS = (unsigned char *) &drive_info;
|
|
int cmos_disks;
|
|
|
|
if (!NR_HD) {
|
|
for (drive=0 ; drive<2 ; drive++) {
|
|
hd_info[drive].cyl = *(unsigned short *) BIOS;
|
|
hd_info[drive].head = *(2+BIOS);
|
|
hd_info[drive].wpcom = *(unsigned short *) (5+BIOS);
|
|
hd_info[drive].ctl = *(8+BIOS);
|
|
hd_info[drive].lzone = *(unsigned short *) (12+BIOS);
|
|
hd_info[drive].sect = *(14+BIOS);
|
|
BIOS += 16;
|
|
}
|
|
|
|
/*
|
|
We querry CMOS about hard disks : it could be that
|
|
we have a SCSI/ESDI/etc controller that is BIOS
|
|
compatable with ST-506, and thus showing up in our
|
|
BIOS table, but not register compatable, and therefore
|
|
not present in CMOS.
|
|
|
|
Furthurmore, we will assume that our ST-506 drives
|
|
<if any> are the primary drives in the system, and
|
|
the ones reflected as drive 1 or 2.
|
|
|
|
The first drive is stored in the high nibble of CMOS
|
|
byte 0x12, the second in the low nibble. This will be
|
|
either a 4 bit drive type or 0xf indicating use byte 0x19
|
|
for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS.
|
|
|
|
Needless to say, a non-zero value means we have
|
|
an AT controller hard disk for that drive.
|
|
|
|
|
|
*/
|
|
|
|
if ((cmos_disks = CMOS_READ(0x12)) & 0xf0)
|
|
if (cmos_disks & 0x0f)
|
|
NR_HD = 2;
|
|
else
|
|
NR_HD = 1;
|
|
}
|
|
i = NR_HD;
|
|
while (i-- > 0) {
|
|
hd[i<<6].nr_sects = 0;
|
|
if (hd_info[i].head > 16) {
|
|
printk("hd.c: ST-506 interface disk with more than 16 heads detected,\n");
|
|
printk(" probably due to non-standard sector translation. Giving up.\n");
|
|
printk(" (disk %d: cyl=%d, sect=%d, head=%d)\n", i,
|
|
hd_info[i].cyl,
|
|
hd_info[i].sect,
|
|
hd_info[i].head);
|
|
if (i+1 == NR_HD)
|
|
NR_HD--;
|
|
continue;
|
|
}
|
|
hd[i<<6].nr_sects = hd_info[i].head*
|
|
hd_info[i].sect*hd_info[i].cyl;
|
|
}
|
|
if (NR_HD) {
|
|
if (irqaction(HD_IRQ,&hd_sigaction)) {
|
|
printk("hd.c: unable to get IRQ%d for the harddisk driver\n",HD_IRQ);
|
|
NR_HD = 0;
|
|
}
|
|
}
|
|
hd_gendisk.nr_real = NR_HD;
|
|
|
|
for(i=0;i<(MAX_HD << 6);i++) hd_blocksizes[i] = 1024;
|
|
blksize_size[MAJOR_NR] = hd_blocksizes;
|
|
}
|
|
|
|
static struct file_operations hd_fops = {
|
|
NULL, /* lseek - default */
|
|
block_read, /* read - general block-dev read */
|
|
block_write, /* write - general block-dev write */
|
|
NULL, /* readdir - bad */
|
|
NULL, /* select */
|
|
hd_ioctl, /* ioctl */
|
|
NULL, /* mmap */
|
|
hd_open, /* open */
|
|
hd_release, /* release */
|
|
block_fsync /* fsync */
|
|
};
|
|
|
|
unsigned long hd_init(unsigned long mem_start, unsigned long mem_end)
|
|
{
|
|
if (register_blkdev(MAJOR_NR,"hd",&hd_fops)) {
|
|
printk("Unable to get major %d for harddisk\n",MAJOR_NR);
|
|
return mem_start;
|
|
}
|
|
blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
|
|
read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
|
|
hd_gendisk.next = gendisk_head;
|
|
gendisk_head = &hd_gendisk;
|
|
timer_table[HD_TIMER].fn = hd_times_out;
|
|
return mem_start;
|
|
}
|
|
|
|
#define DEVICE_BUSY busy[target]
|
|
#define USAGE access_count[target]
|
|
#define CAPACITY (hd_info[target].head*hd_info[target].sect*hd_info[target].cyl)
|
|
/* We assume that the the bios parameters do not change, so the disk capacity
|
|
will not change */
|
|
#undef MAYBE_REINIT
|
|
#define GENDISK_STRUCT hd_gendisk
|
|
|
|
/*
|
|
* This routine is called to flush all partitions and partition tables
|
|
* for a changed scsi disk, and then re-read the new partition table.
|
|
* If we are revalidating a disk because of a media change, then we
|
|
* enter with usage == 0. If we are using an ioctl, we automatically have
|
|
* usage == 1 (we need an open channel to use an ioctl :-), so this
|
|
* is our limit.
|
|
*/
|
|
static int revalidate_hddisk(int dev, int maxusage)
|
|
{
|
|
int target, major;
|
|
struct gendisk * gdev;
|
|
int max_p;
|
|
int start;
|
|
int i;
|
|
|
|
target = DEVICE_NR(MINOR(dev));
|
|
gdev = &GENDISK_STRUCT;
|
|
|
|
cli();
|
|
if (DEVICE_BUSY || USAGE > maxusage) {
|
|
sti();
|
|
return -EBUSY;
|
|
};
|
|
DEVICE_BUSY = 1;
|
|
sti();
|
|
|
|
max_p = gdev->max_p;
|
|
start = target << gdev->minor_shift;
|
|
major = MAJOR_NR << 8;
|
|
|
|
for (i=max_p - 1; i >=0 ; i--) {
|
|
sync_dev(major | start | i);
|
|
invalidate_inodes(major | start | i);
|
|
invalidate_buffers(major | start | i);
|
|
gdev->part[start+i].start_sect = 0;
|
|
gdev->part[start+i].nr_sects = 0;
|
|
};
|
|
|
|
#ifdef MAYBE_REINIT
|
|
MAYBE_REINIT;
|
|
#endif
|
|
|
|
gdev->part[start].nr_sects = CAPACITY;
|
|
resetup_one_dev(gdev, target);
|
|
|
|
DEVICE_BUSY = 0;
|
|
wake_up(&busy_wait);
|
|
return 0;
|
|
}
|
|
|