/*
* reverse -- display input in reverse order by line.
*
* There are six separate cases for this -- regular and non-regular
* files by bytes, lines or the whole file.
*
* BYTES display N bytes
* REG mmap the file and display the lines
* NOREG cyclically read characters into a wrap-around buffer
*
* LINES display N lines
* REG mmap the file and display the lines
* NOREG cyclically read lines into a wrap-around array of buffers
*
* FILE display the entire file
* REG mmap the file and display the lines
* NOREG cyclically read input into a linked list of buffers
*/
void
reverse(FILE *fp, enum STYLE style, off_t off, struct stat *sbp)
{
if (style != REVERSE && off == 0)
return;
if (S_ISREG(sbp->st_mode))
r_reg(fp, style, off, sbp);
else
switch(style) {
case FBYTES:
case RBYTES:
bytes(fp, off);
break;
case FLINES:
case RLINES:
lines(fp, off);
break;
case REVERSE:
r_buf(fp);
break;
default:
break;
}
}
/*
* reverse -- display input in reverse order by line.
*
* There are six separate cases for this -- regular and non-regular
* files by bytes, lines or the whole file.
*
* BYTES display N bytes
* REG reverse scan and display the lines
* NOREG cyclically read characters into a wrap-around buffer
*
* LINES display N lines
* REG reverse scan and display the lines
* NOREG cyclically read lines into a wrap-around array of buffers
*
* FILE display the entire file
* REG reverse scan and display the lines
* NOREG cyclically read input into a linked list of buffers
*/
void
reverse(FILE *fp, enum STYLE style, off_t off, struct stat *sbp)
{
if (style != REVERSE && off == 0)
return;
if (!S_ISREG(sbp->st_mode) || r_reg(fp, style, off, sbp) != 0)
switch(style) {
case FBYTES:
case RBYTES:
(void)bytes(fp, off);
break;
case FLINES:
case RLINES:
(void)lines(fp, off);
break;
case REVERSE:
r_buf(fp);
break;
}
}
/*
* ppc_exec_microseq()
*
* Execute a microsequence.
* Microsequence mechanism is supposed to handle fast I/O operations.
*/
int
ppc_exec_microseq(device_t dev, struct ppb_microseq **p_msq)
{
struct ppc_data *ppc = DEVTOSOFTC(dev);
struct ppb_microseq *mi;
char cc, *p;
int i, iter, len;
int error;
register int reg;
register char mask;
register int accum = 0;
register char *ptr = 0;
struct ppb_microseq *stack = 0;
/* microsequence registers are equivalent to PC-like port registers */
#define r_reg(register,ppc) (bus_space_read_1((ppc)->bst, (ppc)->bsh, register))
#define w_reg(register, ppc, byte) (bus_space_write_1((ppc)->bst, (ppc)->bsh, register, byte))
#define INCR_PC (mi ++) /* increment program counter */
mi = *p_msq;
for (;;) {
switch (mi->opcode) {
case MS_OP_RSET:
cc = r_reg(mi->arg[0].i, ppc);
cc &= (char)mi->arg[2].i; /* clear mask */
cc |= (char)mi->arg[1].i; /* assert mask */
w_reg(mi->arg[0].i, ppc, cc);
INCR_PC;
break;
case MS_OP_RASSERT_P:
reg = mi->arg[1].i;
ptr = ppc->ppc_ptr;
if ((len = mi->arg[0].i) == MS_ACCUM) {
accum = ppc->ppc_accum;
for (; accum; accum--)
w_reg(reg, ppc, *ptr++);
ppc->ppc_accum = accum;
} else
for (i=0; i<len; i++)
w_reg(reg, ppc, *ptr++);
ppc->ppc_ptr = ptr;
INCR_PC;
break;
case MS_OP_RFETCH_P:
reg = mi->arg[1].i;
mask = (char)mi->arg[2].i;
ptr = ppc->ppc_ptr;
if ((len = mi->arg[0].i) == MS_ACCUM) {
accum = ppc->ppc_accum;
for (; accum; accum--)
*ptr++ = r_reg(reg, ppc) & mask;
ppc->ppc_accum = accum;
} else
for (i=0; i<len; i++)
*ptr++ = r_reg(reg, ppc) & mask;
ppc->ppc_ptr = ptr;
INCR_PC;
break;
case MS_OP_RFETCH:
*((char *) mi->arg[2].p) = r_reg(mi->arg[0].i, ppc) &
(char)mi->arg[1].i;
INCR_PC;
break;
case MS_OP_RASSERT:
case MS_OP_DELAY:
/* let's suppose the next instr. is the same */
prefetch:
for (;mi->opcode == MS_OP_RASSERT; INCR_PC)
w_reg(mi->arg[0].i, ppc, (char)mi->arg[1].i);
if (mi->opcode == MS_OP_DELAY) {
DELAY(mi->arg[0].i);
INCR_PC;
goto prefetch;
}
break;
case MS_OP_ADELAY:
if (mi->arg[0].i)
tsleep(NULL, PPBPRI, "ppbdelay",
mi->arg[0].i * (hz/1000));
INCR_PC;
break;
case MS_OP_TRIG:
reg = mi->arg[0].i;
iter = mi->arg[1].i;
p = (char *)mi->arg[2].p;
/* XXX delay limited to 255 us */
for (i=0; i<iter; i++) {
w_reg(reg, ppc, *p++);
DELAY((unsigned char)*p++);
}
INCR_PC;
break;
case MS_OP_SET:
ppc->ppc_accum = mi->arg[0].i;
INCR_PC;
break;
case MS_OP_DBRA:
if (--ppc->ppc_accum > 0)
mi += mi->arg[0].i;
INCR_PC;
break;
case MS_OP_BRSET:
cc = r_str(ppc);
if ((cc & (char)mi->arg[0].i) == (char)mi->arg[0].i)
mi += mi->arg[1].i;
INCR_PC;
break;
case MS_OP_BRCLEAR:
cc = r_str(ppc);
if ((cc & (char)mi->arg[0].i) == 0)
mi += mi->arg[1].i;
INCR_PC;
break;
case MS_OP_BRSTAT:
cc = r_str(ppc);
if ((cc & ((char)mi->arg[0].i | (char)mi->arg[1].i)) ==
(char)mi->arg[0].i)
mi += mi->arg[2].i;
INCR_PC;
break;
case MS_OP_C_CALL:
/*
* If the C call returns !0 then end the microseq.
* The current state of ptr is passed to the C function
*/
if ((error = mi->arg[0].f(mi->arg[1].p, ppc->ppc_ptr)))
return (error);
INCR_PC;
break;
case MS_OP_PTR:
ppc->ppc_ptr = (char *)mi->arg[0].p;
INCR_PC;
break;
case MS_OP_CALL:
if (stack)
panic("%s: too much calls", __func__);
if (mi->arg[0].p) {
/* store the state of the actual
* microsequence
*/
stack = mi;
/* jump to the new microsequence */
mi = (struct ppb_microseq *)mi->arg[0].p;
} else
INCR_PC;
break;
case MS_OP_SUBRET:
/* retrieve microseq and pc state before the call */
mi = stack;
/* reset the stack */
stack = 0;
/* XXX return code */
INCR_PC;
break;
case MS_OP_PUT:
case MS_OP_GET:
case MS_OP_RET:
/* can't return to ppb level during the execution
* of a submicrosequence */
if (stack)
panic("%s: can't return to ppb level",
__func__);
/* update pc for ppb level of execution */
*p_msq = mi;
/* return to ppb level of execution */
return (0);
default:
panic("%s: unknown microsequence opcode 0x%x",
__func__, mi->opcode);
}
}
/* unreached */
}
