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freebsd-dev/sys/alpha/tc/espvar.h
Archie Cobbs 2127f26023 Examine all occurrences of sprintf(), strcat(), and str[n]cpy() 
for possible buffer overflow problems. Replaced most sprintf()'s
with snprintf(); for others cases, added terminating NUL bytes where
appropriate, replaced constants like "16" with sizeof(), etc.

These changes include several bug fixes, but most changes are for
maintainability's sake. Any instance where it wasn't "immediately
obvious" that a buffer overflow could not occur was made safer.

Reviewed by:	Bruce Evans <bde@zeta.org.au>
Reviewed by:	Matthew Dillon <dillon@apollo.backplane.com>
Reviewed by:	Mike Spengler <mks@networkcs.com>
1998-12-04 22:54:57 +00:00

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/* $Id: espvar.h,v 1.1 1998/08/20 08:27:10 dfr Exp $ */
/* $NetBSD: espvar.h,v 1.3.4.1 1996/09/10 17:28:18 cgd Exp $ */
/*
* Copyright (c) 1994 Peter Galbavy. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Peter Galbavy.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*#define ESP_DEBUG 0*/
#define FREQTOCCF(freq) (((freq + 4) / 5))
/* esp revisions */
#define ESP100 0x01
#define ESP100A 0x02
#define ESP200 0x03
#define NCR53C94 0x04
/*
* ECB. Holds additional information for each SCSI command Comments: We
* need a separate scsi command block because we may need to overwrite it
* with a request sense command. Basicly, we refrain from fiddling with
* the scsi_xfer struct (except do the expected updating of return values).
* We'll generally update: xs->{flags,resid,error,sense,status} and
* occasionally xs->retries.
*/
struct ecb {
TAILQ_ENTRY(ecb) chain;
struct scsi_xfer *xs; /* SCSI xfer ctrl block from above */
int flags; /* Status */
#define ECB_QNONE 0
#define ECB_QFREE 1
#define ECB_QREADY 2
#define ECB_QNEXUS 3
#define ECB_QBITS 0x07
#define ECB_CHKSENSE 0x08
#define ECB_ABORTED 0x10
#define ECB_SETQ(e, q) do (e)->flags = ((e)->flags&~ECB_QBITS)|(q); while(0)
struct scsi_generic cmd; /* SCSI command block */
int clen;
char *daddr; /* Saved data pointer */
int dleft; /* Residue */
struct callout_handle timeout_ch;
u_char stat; /* SCSI status byte */
#if ESP_DEBUG > 0
char trace[1000];
#endif
};
#if ESP_DEBUG > 0
#define ECB_TRACE(ecb, msg, a, b) do { \
const char *f = "[" msg "]"; \
int n = strlen((ecb)->trace); \
snprintf((ecb)->trace + n, sizeof((ecb)->trace) - n, f, a, b); \
} while(0)
#else
#define ECB_TRACE(ecb, msg, a, b)
#endif
/*
* Some info about each (possible) target on the SCSI bus. This should
* probably have been a "per target+lunit" structure, but we'll leave it at
* this for now. Is there a way to reliably hook it up to sc->fordriver??
*/
struct esp_tinfo {
int cmds; /* #commands processed */
int dconns; /* #disconnects */
int touts; /* #timeouts */
int perrs; /* #parity errors */
int senses; /* #request sense commands sent */
ushort lubusy; /* What local units/subr. are busy? */
u_char flags;
#define T_NEED_TO_RESET 0x01 /* Should send a BUS_DEV_RESET */
#define T_NEGOTIATE 0x02 /* (Re)Negotiate synchronous options */
#define T_BUSY 0x04 /* Target is busy, i.e. cmd in progress */
#define T_SYNCMODE 0x08 /* sync mode has been negotiated */
#define T_SYNCHOFF 0x10 /* .. */
#define T_RSELECTOFF 0x20 /* .. */
u_char period; /* Period suggestion */
u_char offset; /* Offset suggestion */
} tinfo_t;
/* Register a linenumber (for debugging) */
#define LOGLINE(p)
#define ESP_SHOWECBS 0x01
#define ESP_SHOWINTS 0x02
#define ESP_SHOWCMDS 0x04
#define ESP_SHOWMISC 0x08
#define ESP_SHOWTRAC 0x10
#define ESP_SHOWSTART 0x20
#define ESP_SHOWPHASE 0x40
#define ESP_SHOWDMA 0x80
#define ESP_SHOWCCMDS 0x100
#define ESP_SHOWMSGS 0x200
#ifdef ESP_DEBUG
extern int esp_debug;
#define ESP_ECBS(str) do {if (esp_debug & ESP_SHOWECBS) printf str;} while (0)
#define ESP_MISC(str) do {if (esp_debug & ESP_SHOWMISC) printf str;} while (0)
#define ESP_INTS(str) do {if (esp_debug & ESP_SHOWINTS) printf str;} while (0)
#define ESP_TRACE(str) do {if (esp_debug & ESP_SHOWTRAC) printf str;} while (0)
#define ESP_CMDS(str) do {if (esp_debug & ESP_SHOWCMDS) printf str;} while (0)
#define ESP_START(str) do {if (esp_debug & ESP_SHOWSTART) printf str;}while (0)
#define ESP_PHASE(str) do {if (esp_debug & ESP_SHOWPHASE) printf str;}while (0)
#define ESP_DMA(str) do {if (esp_debug & ESP_SHOWDMA) printf str;}while (0)
#define ESP_MSGS(str) do {if (esp_debug & ESP_SHOWMSGS) printf str;}while (0)
#else
#define ESP_ECBS(str)
#define ESP_MISC(str)
#define ESP_INTS(str)
#define ESP_TRACE(str)
#define ESP_CMDS(str)
#define ESP_START(str)
#define ESP_PHASE(str)
#define ESP_DMA(str)
#define ESP_MSGS(str)
#endif
#define ESP_MAX_MSG_LEN 8
struct esp_softc {
struct device sc_dev; /* us as a device */
#ifdef SPARC_DRIVER
struct sbusdev sc_sd; /* sbus device */
struct intrhand sc_ih; /* intr handler */
#endif
struct evcnt sc_intrcnt; /* intr count */
struct scsi_link sc_link; /* scsi lint struct */
#ifdef SPARC_DRIVER
volatile u_char *sc_reg; /* the registers */
struct dma_softc *sc_dma; /* pointer to my dma */
#else
volatile u_int32_t *sc_reg; /* the registers */
struct tcds_slotconfig *sc_dma; /* DMA/slot info lives here. */
void *sc_cookie; /* intr. handling cookie */
#endif
/* register defaults */
u_char sc_cfg1; /* Config 1 */
u_char sc_cfg2; /* Config 2, not ESP100 */
u_char sc_cfg3; /* Config 3, only ESP200 */
u_char sc_ccf; /* Clock Conversion */
u_char sc_timeout;
/* register copies, see espreadregs() */
u_char sc_espintr;
u_char sc_espstat;
u_char sc_espstep;
u_char sc_espfflags;
/* Lists of command blocks */
TAILQ_HEAD(ecb_list, ecb) free_list,
ready_list,
nexus_list;
struct ecb *sc_nexus; /* current command */
struct ecb sc_ecb[8]; /* one per target */
struct esp_tinfo sc_tinfo[8];
/* Data about the current nexus (updated for every cmd switch) */
caddr_t sc_dp; /* Current data pointer */
ssize_t sc_dleft; /* Data left to transfer */
/* Adapter state */
int sc_phase; /* Copy of what bus phase we are in */
int sc_prevphase; /* Copy of what bus phase we were in */
u_char sc_state; /* State applicable to the adapter */
u_char sc_flags;
u_char sc_selid;
u_char sc_lastcmd;
/* Message stuff */
u_char sc_msgpriq; /* One or more messages to send (encoded) */
u_char sc_msgout; /* What message is on its way out? */
u_char sc_omess[ESP_MAX_MSG_LEN];
caddr_t sc_omp; /* Message pointer (for multibyte messages) */
size_t sc_omlen;
u_char sc_imess[ESP_MAX_MSG_LEN + 1];
caddr_t sc_imp; /* Message pointer (for multibyte messages) */
size_t sc_imlen;
/* hardware/openprom stuff */
int sc_node; /* PROM node ID */
int sc_freq; /* Freq in HZ */
#ifdef SPARC_DRIVER
int sc_pri; /* SBUS priority */
#endif
int sc_id; /* our scsi id */
int sc_rev; /* esp revision */
int sc_minsync; /* minimum sync period / 4 */
int sc_maxxfer; /* maximum transfer size */
};
/* values for sc_state */
#define ESP_IDLE 0x01 /* waiting for something to do */
#define ESP_TMP_UNAVAIL 0x02 /* Don't accept SCSI commands */
#define ESP_SELECTING 0x03 /* SCSI command is arbiting */
#define ESP_RESELECTED 0x04 /* Has been reselected */
#define ESP_HASNEXUS 0x05 /* Actively using the SCSI bus */
#define ESP_CLEANING 0x06
#define ESP_SBR 0x07 /* Expect a SCSI RST because we commanded it */
/* values for sc_flags */
#define ESP_DROP_MSGI 0x01 /* Discard all msgs (parity err detected) */
#define ESP_DOINGDMA 0x02 /* The FIFO data path is active! */
#define ESP_BUSFREE_OK 0x04 /* Bus free phase is OK. */
#define ESP_SYNCHNEGO 0x08 /* Synch negotiation in progress. */
/*#define ESP_BLOCKED 0x10 * Don't schedule new scsi bus operations */
#define ESP_DISCON 0x10 /* Target sent DISCONNECT msg */
#define ESP_ABORTING 0x20 /* Bailing out */
#define ESP_ICCS 0x40 /* Expect status phase results */
#define ESP_WAITI 0x80 /* Waiting for non-DMA data to arrive */
/* values for sc_msgout */
#define SEND_DEV_RESET 0x01
#define SEND_PARITY_ERROR 0x02
#define SEND_ABORT 0x04
#define SEND_REJECT 0x08
#define SEND_INIT_DET_ERR 0x10
#define SEND_IDENTIFY 0x20
#define SEND_SDTR 0x40
/* SCSI Status codes */
#define ST_GOOD 0x00
#define ST_CHKCOND 0x02
#define ST_CONDMET 0x04
#define ST_BUSY 0x08
#define ST_INTERMED 0x10
#define ST_INTERMED_CONDMET 0x14
#define ST_RESERVATION_CONFLICT 0x18
#define ST_CMD_TERM 0x22
#define ST_QUEUE_FULL 0x28
#define ST_MASK 0x3e /* bit 0,6,7 is reserved */
/* phase bits */
#define IOI 0x01
#define CDI 0x02
#define MSGI 0x04
/* Information transfer phases */
#define DATA_OUT_PHASE (0)
#define DATA_IN_PHASE (IOI)
#define COMMAND_PHASE (CDI)
#define STATUS_PHASE (CDI|IOI)
#define MESSAGE_OUT_PHASE (MSGI|CDI)
#define MESSAGE_IN_PHASE (MSGI|CDI|IOI)
#define PHASE_MASK (MSGI|CDI|IOI)
/* Some pseudo phases for getphase()*/
#define BUSFREE_PHASE 0x100 /* Re/Selection no longer valid */
#define INVALID_PHASE 0x101 /* Re/Selection valid, but no REQ yet */
#define PSEUDO_PHASE 0x100 /* "pseudo" bit */
static u_char ESP_READ_REG(struct esp_softc *, int);
#if 1
static __inline u_char
ESP_READ_REG(sc, reg)
struct esp_softc *sc;
int reg;
{
u_char v;
v = sc->sc_reg[reg * 2] & 0xff;
alpha_mb();
return v;
}
#else
#define ESP_READ_REG(sc, reg) \
((u_char)((sc)->sc_reg[(reg) * 2] & 0xff))
#endif
#define ESP_WRITE_REG(sc, reg, val) \
do { \
u_char v = (val); \
(sc)->sc_reg[(reg) * 2] = v; \
alpha_mb(); \
} while (0)
#ifdef ESP_DEBUG
#define ESPCMD(sc, cmd) do { \
if (esp_debug & ESP_SHOWCCMDS) \
printf("<cmd:0x%x>", (unsigned)cmd); \
sc->sc_lastcmd = cmd; \
ESP_WRITE_REG(sc, ESP_CMD, cmd); \
} while (0)
#else
#define ESPCMD(sc, cmd) ESP_WRITE_REG(sc, ESP_CMD, cmd)
#endif
#define SAME_ESP(sc, bp, ca) \
((bp->val[0] == ca->ca_slot && bp->val[1] == ca->ca_offset) || \
(bp->val[0] == -1 && bp->val[1] == sc->sc_dev.dv_unit))
#ifndef SPARC_DRIVER
/* DMA macros for ESP */
#define DMA_ISINTR(sc) tcds_dma_isintr(sc)
#define DMA_RESET(sc) tcds_dma_reset(sc)
#define DMA_INTR(sc) tcds_dma_intr(sc)
#define DMA_SETUP(sc, addr, len, datain, dmasize) \
tcds_dma_setup(sc, addr, len, datain, dmasize)
#define DMA_GO(sc) tcds_dma_go(sc)
#define DMA_ISACTIVE(sc) tcds_dma_isactive(sc)
#endif
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