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old-cross-binutils/sim/mips/sky-pke.c
Frank Ch. Eigler 89154e47a3 * Unit testing of PKE sim continuing. Only minor VU addressing problems 
found today.
1998-02-25 01:13:05 +00:00

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/* Copyright (C) 1998, Cygnus Solutions */
/* Debugguing PKE? */
#define PKE_DEBUG
#include <stdlib.h>
#include "sky-pke.h"
#include "sky-dma.h"
#include "sim-bits.h"
#include "sim-assert.h"
#include "sky-vu0.h"
#include "sky-vu1.h"
#include "sky-gpuif.h"
/* Imported functions */
void device_error (device *me, char* message); /* device.c */
/* Internal function declarations */
static int pke_io_read_buffer(device*, void*, int, address_word,
unsigned, sim_cpu*, sim_cia);
static int pke_io_write_buffer(device*, const void*, int, address_word,
unsigned, sim_cpu*, sim_cia);
static void pke_issue(SIM_DESC, struct pke_device*);
static void pke_pc_advance(struct pke_device*, int num_words);
static unsigned_4* pke_pc_operand(struct pke_device*, int operand_num);
static unsigned_4 pke_pc_operand_bits(struct pke_device*, int bit_offset,
int bit_width, unsigned_4* sourceaddr);
static struct fifo_quadword* pke_pc_fifo(struct pke_device*, int operand_num,
unsigned_4** operand);
static void pke_attach(SIM_DESC sd, struct pke_device* me);
enum pke_check_target { chk_vu, chk_path1, chk_path2, chk_path3 };
static int pke_check_stall(struct pke_device* me, enum pke_check_target what);
static void pke_flip_dbf(struct pke_device* me);
/* PKEcode handlers */
static void pke_code_nop(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_stcycl(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_offset(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_base(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_itop(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_stmod(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_mskpath3(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_pkemark(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_flushe(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_flush(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_flusha(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_pkemscal(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_pkemscnt(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_pkemscalf(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_stmask(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_strow(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_stcol(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_mpg(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_direct(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_directhl(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_unpack(struct pke_device* me, unsigned_4 pkecode);
static void pke_code_error(struct pke_device* me, unsigned_4 pkecode);
/* Static data */
struct pke_device pke0_device =
{
{ "pke0", &pke_io_read_buffer, &pke_io_write_buffer }, /* device */
0, 0, /* ID, flags */
{}, /* regs */
{}, 0, /* FIFO write buffer */
NULL, 0, 0, NULL, /* FIFO */
0, 0 /* pc */
};
struct pke_device pke1_device =
{
{ "pke1", &pke_io_read_buffer, &pke_io_write_buffer }, /* device */
1, 0, /* ID, flags */
{}, /* regs */
{}, 0, /* FIFO write buffer */
NULL, 0, 0, NULL, /* FIFO */
0, 0 /* pc */
};
/* External functions */
/* Attach PKE addresses to main memory */
void
pke0_attach(SIM_DESC sd)
{
pke_attach(sd, & pke0_device);
}
void
pke1_attach(SIM_DESC sd)
{
pke_attach(sd, & pke1_device);
}
/* Issue a PKE instruction if possible */
void
pke0_issue(SIM_DESC sd)
{
pke_issue(sd, & pke0_device);
}
void
pke1_issue(SIM_DESC sd)
{
pke_issue(sd, & pke1_device);
}
/* Internal functions */
/* Attach PKE memory regions to simulator */
void
pke_attach(SIM_DESC sd, struct pke_device* me)
{
/* register file */
sim_core_attach (sd, NULL, 0, access_read_write, 0,
(me->pke_number == 0) ? PKE0_REGISTER_WINDOW_START : PKE1_REGISTER_WINDOW_START,
PKE_REGISTER_WINDOW_SIZE /*nr_bytes*/,
0 /*modulo*/,
(device*) me,
NULL /*buffer*/);
/* FIFO port */
sim_core_attach (sd, NULL, 0, access_read_write, 0,
(me->pke_number == 0) ? PKE0_FIFO_ADDR : PKE1_FIFO_ADDR,
sizeof(quadword) /*nr_bytes*/,
0 /*modulo*/,
(device*) me,
NULL /*buffer*/);
/* VU MEM0 tracking table */
sim_core_attach (sd, NULL, 0, access_read_write, 0,
((me->pke_number == 0) ? VU0_MEM0_SRCADDR_START : VU1_MEM0_SRCADDR_START),
((me->pke_number == 0) ? VU0_MEM0_SIZE : VU1_MEM0_SIZE) / 2,
0 /*modulo*/,
NULL,
NULL /*buffer*/);
/* VU MEM1 tracking table */
sim_core_attach (sd, NULL, 0, access_read_write, 0,
((me->pke_number == 0) ? VU0_MEM1_SRCADDR_START : VU1_MEM1_SRCADDR_START),
((me->pke_number == 0) ? VU0_MEM1_SIZE : VU1_MEM1_SIZE) / 4,
0 /*modulo*/,
NULL,
NULL /*buffer*/);
/* attach to trace file if appropriate */
{
char trace_envvar[80];
char* trace_filename = NULL;
sprintf(trace_envvar, "VIF%d_TRACE_FILE", me->pke_number);
trace_filename = getenv(trace_envvar);
if(trace_filename != NULL)
{
me->fifo_trace_file = fopen(trace_filename, "w");
if(me->fifo_trace_file == NULL)
perror("VIF FIFO trace error on fopen");
else
setvbuf(me->fifo_trace_file, NULL, _IOLBF, 0);
}
}
}
/* Handle a PKE read; return no. of bytes read */
int
pke_io_read_buffer(device *me_,
void *dest,
int space,
address_word addr,
unsigned nr_bytes,
sim_cpu *cpu,
sim_cia cia)
{
/* downcast to gather embedding pke_device struct */
struct pke_device* me = (struct pke_device*) me_;
/* find my address ranges */
address_word my_reg_start =
(me->pke_number == 0) ? PKE0_REGISTER_WINDOW_START : PKE1_REGISTER_WINDOW_START;
address_word my_fifo_addr =
(me->pke_number == 0) ? PKE0_FIFO_ADDR : PKE1_FIFO_ADDR;
/* enforce that an access does not span more than one quadword */
address_word low = ADDR_TRUNC_QW(addr);
address_word high = ADDR_TRUNC_QW(addr + nr_bytes - 1);
if(low != high)
return 0;
/* classify address & handle */
if((addr >= my_reg_start) && (addr < my_reg_start + PKE_REGISTER_WINDOW_SIZE))
{
/* register bank */
int reg_num = ADDR_TRUNC_QW(addr - my_reg_start) >> 4;
int reg_byte = ADDR_OFFSET_QW(addr); /* find byte-offset inside register bank */
int readable = 1;
quadword result;
/* clear result */
result[0] = result[1] = result[2] = result[3] = 0;
/* handle reads to individual registers; clear `readable' on error */
switch(reg_num)
{
/* handle common case of register reading, side-effect free */
/* PKE1-only registers*/
case PKE_REG_BASE:
case PKE_REG_OFST:
case PKE_REG_TOPS:
case PKE_REG_TOP:
case PKE_REG_DBF:
if(me->pke_number == 0)
readable = 0;
/* fall through */
/* PKE0 & PKE1 common registers*/
case PKE_REG_STAT:
case PKE_REG_ERR:
case PKE_REG_MARK:
case PKE_REG_CYCLE:
case PKE_REG_MODE:
case PKE_REG_NUM:
case PKE_REG_MASK:
case PKE_REG_CODE:
case PKE_REG_ITOPS:
case PKE_REG_ITOP:
case PKE_REG_R0:
case PKE_REG_R1:
case PKE_REG_R2:
case PKE_REG_R3:
case PKE_REG_C0:
case PKE_REG_C1:
case PKE_REG_C2:
case PKE_REG_C3:
result[0] = me->regs[reg_num][0];
break;
/* handle common case of write-only registers */
case PKE_REG_FBRST:
readable = 0;
break;
default:
ASSERT(0); /* test above should prevent this possibility */
}
/* perform transfer & return */
if(readable)
{
/* copy the bits */
memcpy(dest, ((unsigned_1*) &result) + reg_byte, nr_bytes);
/* okay */
}
else
{
/* return zero bits */
memset(dest, 0, nr_bytes);
}
return nr_bytes;
/* NOTREACHED */
}
else if(addr >= my_fifo_addr &&
addr < my_fifo_addr + sizeof(quadword))
{
/* FIFO */
/* FIFO is not readable: return a word of zeroes */
memset(dest, 0, nr_bytes);
return nr_bytes;
}
/* NOTREACHED */
return 0;
}
/* Handle a PKE read; return no. of bytes written */
int
pke_io_write_buffer(device *me_,
const void *src,
int space,
address_word addr,
unsigned nr_bytes,
sim_cpu *cpu,
sim_cia cia)
{
/* downcast to gather embedding pke_device struct */
struct pke_device* me = (struct pke_device*) me_;
/* find my address ranges */
address_word my_reg_start =
(me->pke_number == 0) ? PKE0_REGISTER_WINDOW_START : PKE1_REGISTER_WINDOW_START;
address_word my_fifo_addr =
(me->pke_number == 0) ? PKE0_FIFO_ADDR : PKE1_FIFO_ADDR;
/* enforce that an access does not span more than one quadword */
address_word low = ADDR_TRUNC_QW(addr);
address_word high = ADDR_TRUNC_QW(addr + nr_bytes - 1);
if(low != high)
return 0;
/* classify address & handle */
if((addr >= my_reg_start) && (addr < my_reg_start + PKE_REGISTER_WINDOW_SIZE))
{
/* register bank */
int reg_num = ADDR_TRUNC_QW(addr - my_reg_start) >> 4;
int reg_byte = ADDR_OFFSET_QW(addr); /* find byte-offset inside register bank */
int writeable = 1;
quadword input;
/* clear input */
input[0] = input[1] = input[2] = input[3] = 0;
/* write user-given bytes into input */
memcpy(((unsigned_1*) &input) + reg_byte, src, nr_bytes);
/* handle writes to individual registers; clear `writeable' on error */
switch(reg_num)
{
case PKE_REG_FBRST:
/* Order these tests from least to most overriding, in case
multiple bits are set. */
if(BIT_MASK_GET(input[0], PKE_REG_FBRST_STC_B, PKE_REG_FBRST_STC_E))
{
/* clear a bunch of status bits */
PKE_REG_MASK_SET(me, STAT, PSS, 0);
PKE_REG_MASK_SET(me, STAT, PFS, 0);
PKE_REG_MASK_SET(me, STAT, PIS, 0);
PKE_REG_MASK_SET(me, STAT, INT, 0);
PKE_REG_MASK_SET(me, STAT, ER0, 0);
PKE_REG_MASK_SET(me, STAT, ER1, 0);
me->flags &= ~PKE_FLAG_PENDING_PSS;
/* will allow resumption of possible stalled instruction */
}
if(BIT_MASK_GET(input[0], PKE_REG_FBRST_STP_B, PKE_REG_FBRST_STP_E))
{
me->flags |= PKE_FLAG_PENDING_PSS;
}
if(BIT_MASK_GET(input[0], PKE_REG_FBRST_FBK_B, PKE_REG_FBRST_FBK_E))
{
PKE_REG_MASK_SET(me, STAT, PFS, 1);
}
if(BIT_MASK_GET(input[0], PKE_REG_FBRST_RST_B, PKE_REG_FBRST_RST_E))
{
/* clear FIFO by skipping to word after PC: also
prevents re-execution attempt of possible stalled
instruction */
me->fifo_num_elements = me->fifo_pc;
/* clear registers, flag, other state */
memset(me->regs, 0, sizeof(me->regs));
me->fifo_qw_done = 0;
me->flags = 0;
me->qw_pc = 0;
}
break;
case PKE_REG_ERR:
/* copy bottom three bits */
BIT_MASK_SET(me->regs[PKE_REG_ERR][0], 0, 2, BIT_MASK_GET(input[0], 0, 2));
break;
case PKE_REG_MARK:
/* copy bottom sixteen bits */
PKE_REG_MASK_SET(me, MARK, MARK, BIT_MASK_GET(input[0], 0, 15));
/* reset MRK bit in STAT */
PKE_REG_MASK_SET(me, STAT, MRK, 0);
break;
/* handle common case of read-only registers */
/* PKE1-only registers - not really necessary to handle separately */
case PKE_REG_BASE:
case PKE_REG_OFST:
case PKE_REG_TOPS:
case PKE_REG_TOP:
case PKE_REG_DBF:
if(me->pke_number == 0)
writeable = 0;
/* fall through */
/* PKE0 & PKE1 common registers*/
case PKE_REG_STAT:
/* ignore FDR bit for PKE1_STAT -- simulator does not implement PKE->RAM transfers */
case PKE_REG_CYCLE:
case PKE_REG_MODE:
case PKE_REG_NUM:
case PKE_REG_MASK:
case PKE_REG_CODE:
case PKE_REG_ITOPS:
case PKE_REG_ITOP:
case PKE_REG_R0:
case PKE_REG_R1:
case PKE_REG_R2:
case PKE_REG_R3:
case PKE_REG_C0:
case PKE_REG_C1:
case PKE_REG_C2:
case PKE_REG_C3:
writeable = 0;
break;
default:
ASSERT(0); /* test above should prevent this possibility */
}
/* perform return */
if(! writeable)
{
; /* error */
}
return nr_bytes;
/* NOTREACHED */
}
else if(addr >= my_fifo_addr &&
addr < my_fifo_addr + sizeof(quadword))
{
/* FIFO */
struct fifo_quadword* fqw;
int fifo_byte = ADDR_OFFSET_QW(addr); /* find byte-offset inside fifo quadword */
unsigned_4 dma_tag_present = 0;
int i;
/* collect potentially-partial quadword in write buffer */
memcpy(((unsigned_1*)& me->fifo_qw_in_progress) + fifo_byte, src, nr_bytes);
/* mark bytes written */
for(i = fifo_byte; i < fifo_byte + nr_bytes; i++)
BIT_MASK_SET(me->fifo_qw_done, i, i, 1);
/* return if quadword not quite written yet */
if(BIT_MASK_GET(me->fifo_qw_done, 0, sizeof(quadword)-1) !=
BIT_MASK_BTW(0, sizeof(quadword)-1))
return nr_bytes;
/* all done - process quadword after clearing flag */
BIT_MASK_SET(me->fifo_qw_done, 0, sizeof(quadword)-1, 0);
/* ensure FIFO has enough elements */
if(me->fifo_num_elements == me->fifo_buffer_size)
{
/* time to grow */
int new_fifo_buffer_size = me->fifo_buffer_size + 20;
void* ptr = realloc((void*) me->fifo, new_fifo_buffer_size*sizeof(struct fifo_quadword));
if(ptr == NULL)
{
/* oops, cannot enlarge FIFO any more */
device_error(me_, "Cannot enlarge FIFO buffer\n");
return 0;
}
me->fifo = ptr;
me->fifo_buffer_size = new_fifo_buffer_size;
}
/* add new quadword at end of FIFO */
fqw = & me->fifo[me->fifo_num_elements];
fqw->word_class[0] = fqw->word_class[1] =
fqw->word_class[2] = fqw->word_class[3] = wc_unknown;
memcpy((void*) fqw->data, me->fifo_qw_in_progress, sizeof(quadword));
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_READ(me, (me->pke_number == 0 ? DMA_D0_MADR : DMA_D1_MADR),
& fqw->source_address, /* target endian */
4);
fqw->source_address = T2H_4(fqw->source_address);
PKE_MEM_READ(me, (me->pke_number == 0 ? DMA_D0_PKTFLAG : DMA_D1_PKTFLAG),
& dma_tag_present,
4);
if(dma_tag_present)
{
/* lower two words are DMA tags */
fqw->word_class[0] = fqw->word_class[1] = wc_dma;
}
me->fifo_num_elements++;
/* set FQC to "1" as FIFO is now not empty */
PKE_REG_MASK_SET(me, STAT, FQC, 1);
/* okay */
return nr_bytes;
}
/* NOTREACHED */
return 0;
}
/* Issue & swallow next PKE opcode if possible/available */
void
pke_issue(SIM_DESC sd, struct pke_device* me)
{
struct fifo_quadword* fqw;
unsigned_4 fw;
unsigned_4 cmd, intr, num;
unsigned_4 imm;
/* 1 -- test go / no-go for PKE execution */
/* switch on STAT:PSS if PSS-pending and in idle state */
if((PKE_REG_MASK_GET(me, STAT, PPS) == PKE_REG_STAT_PPS_IDLE) &&
(me->flags & PKE_FLAG_PENDING_PSS) != 0)
{
me->flags &= ~PKE_FLAG_PENDING_PSS;
PKE_REG_MASK_SET(me, STAT, PSS, 1);
}
/* check for stall/halt control bits */
if(PKE_REG_MASK_GET(me, STAT, PFS) ||
PKE_REG_MASK_GET(me, STAT, PSS) || /* note special treatment below */
/* PEW bit not a reason to keep stalling - it's re-checked below */
/* PGW bit not a reason to keep stalling - it's re-checked below */
/* maskable stall controls: ER0, ER1, PIS */
(PKE_REG_MASK_GET(me, STAT, ER0) && !PKE_REG_MASK_GET(me, ERR, ME0)) ||
(PKE_REG_MASK_GET(me, STAT, ER1) && !PKE_REG_MASK_GET(me, ERR, ME1)) ||
(PKE_REG_MASK_GET(me, STAT, PIS) && !PKE_REG_MASK_GET(me, ERR, MII)))
{
/* try again next cycle; no state change */
return;
}
/* confirm availability of new quadword of PKE instructions */
if(me->fifo_num_elements <= me->fifo_pc)
return;
/* 2 -- fetch PKE instruction */
/* skip over DMA tag, if present */
pke_pc_advance(me, 0);
/* "fetch" instruction quadword and word */
fqw = & me->fifo[me->fifo_pc];
fw = fqw->data[me->qw_pc];
/* store word in PKECODE register */
me->regs[PKE_REG_CODE][0] = fw;
/* 3 -- decode PKE instruction */
/* PKE instruction format: [intr 0:0][pke-command 6:0][num 7:0][immediate 15:0],
so op-code is in top byte. */
intr = BIT_MASK_GET(fw, PKE_OPCODE_I_B, PKE_OPCODE_I_E);
cmd = BIT_MASK_GET(fw, PKE_OPCODE_CMD_B, PKE_OPCODE_CMD_E);
num = BIT_MASK_GET(fw, PKE_OPCODE_NUM_B, PKE_OPCODE_NUM_E);
imm = BIT_MASK_GET(fw, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
if(intr)
{
/* set INT flag in STAT register */
PKE_REG_MASK_SET(me, STAT, INT, 1);
/* XXX: send interrupt to 5900? */
}
/* decoding */
if(PKE_REG_MASK_GET(me, STAT, PPS) == PKE_REG_STAT_PPS_IDLE)
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_DECODE);
/* decode & execute */
if(IS_PKE_CMD(cmd, PKENOP))
pke_code_nop(me, fw);
else if(IS_PKE_CMD(cmd, STCYCL))
pke_code_stcycl(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, OFFSET))
pke_code_offset(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, BASE))
pke_code_base(me, fw);
else if(IS_PKE_CMD(cmd, ITOP))
pke_code_itop(me, fw);
else if(IS_PKE_CMD(cmd, STMOD))
pke_code_stmod(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, MSKPATH3))
pke_code_mskpath3(me, fw);
else if(IS_PKE_CMD(cmd, PKEMARK))
pke_code_pkemark(me, fw);
else if(IS_PKE_CMD(cmd, FLUSHE))
pke_code_flushe(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, FLUSH))
pke_code_flush(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, FLUSHA))
pke_code_flusha(me, fw);
else if(IS_PKE_CMD(cmd, PKEMSCAL))
pke_code_pkemscal(me, fw);
else if(IS_PKE_CMD(cmd, PKEMSCNT))
pke_code_pkemscnt(me, fw);
else if(me->pke_number == 1 && IS_PKE_CMD(cmd, PKEMSCALF))
pke_code_pkemscalf(me, fw);
else if(IS_PKE_CMD(cmd, STMASK))
pke_code_stmask(me, fw);
else if(IS_PKE_CMD(cmd, STROW))
pke_code_strow(me, fw);
else if(IS_PKE_CMD(cmd, STCOL))
pke_code_stcol(me, fw);
else if(IS_PKE_CMD(cmd, MPG))
pke_code_mpg(me, fw);
else if(IS_PKE_CMD(cmd, DIRECT))
pke_code_direct(me, fw);
else if(IS_PKE_CMD(cmd, DIRECTHL))
pke_code_directhl(me, fw);
else if(IS_PKE_CMD(cmd, UNPACK))
pke_code_unpack(me, fw);
/* ... no other commands ... */
else
pke_code_error(me, fw);
}
/* advance the PC by given number of data words; update STAT/FQC
field; assume FIFO is filled enough; classify passed-over words;
write FIFO trace line */
void
pke_pc_advance(struct pke_device* me, int num_words)
{
int num = num_words;
struct fifo_quadword* fq = NULL;
ASSERT(num_words >= 0);
/* printf("pke %d pc_advance num_words %d\n", me->pke_number, num_words); */
while(1)
{
fq = & me->fifo[me->fifo_pc];
/* skip over DMA tag words if present in word 0 or 1 */
if(fq->word_class[me->qw_pc] == wc_dma)
{
/* skip by going around loop an extra time */
num ++;
}
/* nothing left to skip / no DMA tag here */
if(num == 0)
break;
/* one word skipped */
num --;
/* point to next word */
me->qw_pc ++;
if(me->qw_pc == 4)
{
me->qw_pc = 0;
me->fifo_pc ++;
/* trace the consumption of the FIFO quadword we just skipped over */
/* fq still points to it */
if(me->fifo_trace_file != NULL)
{
/* assert complete classification */
ASSERT(fq->word_class[3] != wc_unknown);
ASSERT(fq->word_class[2] != wc_unknown);
ASSERT(fq->word_class[1] != wc_unknown);
ASSERT(fq->word_class[0] != wc_unknown);
/* print trace record */
fprintf(me->fifo_trace_file,
"%d 0x%08x_%08x_%08x_%08x 0x%08x %c%c%c%c\n",
(me->pke_number == 0 ? 0 : 1),
(unsigned) fq->data[3], (unsigned) fq->data[2],
(unsigned) fq->data[1], (unsigned) fq->data[0],
(unsigned) fq->source_address,
fq->word_class[3], fq->word_class[2],
fq->word_class[1], fq->word_class[0]);
}
/* XXX: zap old entries in FIFO */
} /* next quadword */
}
/* clear FQC if FIFO is now empty */
if(me->fifo_num_elements == me->fifo_pc)
{
PKE_REG_MASK_SET(me, STAT, FQC, 0);
}
else /* annote the word where the PC lands as an PKEcode */
{
fq = & me->fifo[me->fifo_pc];
ASSERT(fq->word_class[me->qw_pc] == wc_pkecode ||
fq->word_class[me->qw_pc] == wc_unknown);
fq->word_class[me->qw_pc] = wc_pkecode;
}
}
/* Return pointer to FIFO quadword containing given operand# in FIFO.
`operand_num' starts at 1. Return pointer to operand word in last
argument, if non-NULL. If FIFO is not full enough, return 0.
Signal an ER0 indication upon skipping a DMA tag. */
struct fifo_quadword*
pke_pc_fifo(struct pke_device* me, int operand_num, unsigned_4** operand)
{
int num = operand_num;
int new_qw_pc, new_fifo_pc;
struct fifo_quadword* fq = NULL;
ASSERT(num > 0);
/* snapshot current pointers */
new_fifo_pc = me->fifo_pc;
new_qw_pc = me->qw_pc;
/* printf("pke %d pc_fifo operand_num %d\n", me->pke_number, operand_num); */
do
{
/* one word skipped */
num --;
/* point to next word */
new_qw_pc ++;
if(new_qw_pc == 4)
{
new_qw_pc = 0;
new_fifo_pc ++;
}
/* check for FIFO underflow */
if(me->fifo_num_elements == new_fifo_pc)
{
fq = NULL;
break;
}
/* skip over DMA tag words if present in word 0 or 1 */
fq = & me->fifo[new_fifo_pc];
if(fq->word_class[new_qw_pc] == wc_dma)
{
/* mismatch error! */
PKE_REG_MASK_SET(me, STAT, ER0, 1);
/* skip by going around loop an extra time */
num ++;
}
}
while(num > 0);
/* return pointer to operand word itself */
if(fq != NULL)
{
*operand = & fq->data[new_qw_pc];
/* annote the word where the pseudo lands as an PKE operand */
ASSERT(fq->word_class[new_qw_pc] == wc_pkedata ||
fq->word_class[new_qw_pc] == wc_unknown);
fq->word_class[new_qw_pc] = wc_pkedata;
}
return fq;
}
/* Return pointer to given operand# in FIFO. `operand_num' starts at 1.
If FIFO is not full enough, return 0. Skip over DMA tags, but mark
them as an error (ER0). */
unsigned_4*
pke_pc_operand(struct pke_device* me, int operand_num)
{
unsigned_4* operand = NULL;
struct fifo_quadword* fifo_operand;
fifo_operand = pke_pc_fifo(me, operand_num, & operand);
if(fifo_operand == NULL)
ASSERT(operand == NULL); /* pke_pc_fifo() ought leave it untouched */
return operand;
}
/* Return a bit-field extract of given operand# in FIFO, and its
source-addr. `bit_offset' starts at 0, referring to LSB after PKE
instruction word. Width must be >0, <=32. Assume FIFO is full
enough. Skip over DMA tags, but mark them as an error (ER0). */
unsigned_4
pke_pc_operand_bits(struct pke_device* me, int bit_offset, int bit_width, unsigned_4* source_addr)
{
unsigned_4* word = NULL;
unsigned_4 value;
struct fifo_quadword* fifo_operand;
int wordnumber, bitnumber;
wordnumber = bit_offset/32;
bitnumber = bit_offset%32;
/* find operand word with bitfield */
fifo_operand = pke_pc_fifo(me, wordnumber + 1, &word);
ASSERT(word != NULL);
/* extract bitfield from word */
value = BIT_MASK_GET(*word, bitnumber, bitnumber + bit_width - 1);
/* extract source addr from fifo word */
*source_addr = fifo_operand->source_address;
return value;
}
/* check for stall conditions on indicated devices (path* only on PKE1), do not change status
return 0 iff no stall */
int
pke_check_stall(struct pke_device* me, enum pke_check_target what)
{
int any_stall = 0;
unsigned_4 cop2_stat, gpuif_stat;
/* read status words */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_READ(me, (GIF_REG_STAT),
& gpuif_stat,
4);
PKE_MEM_READ(me, (COP2_REG_STAT_ADDR),
& cop2_stat,
4);
/* perform checks */
if(what == chk_vu)
{
if(me->pke_number == 0)
any_stall = BIT_MASK_GET(cop2_stat, COP2_REG_STAT_VBS0_B, COP2_REG_STAT_VBS0_E);
else /* if(me->pke_number == 1) */
any_stall = BIT_MASK_GET(cop2_stat, COP2_REG_STAT_VBS1_B, COP2_REG_STAT_VBS1_E);
}
else if(what == chk_path1) /* VU -> GPUIF */
{
if(BIT_MASK_GET(gpuif_stat, GPUIF_REG_STAT_APATH_B, GPUIF_REG_STAT_APATH_E) == 1)
any_stall = 1;
}
else if(what == chk_path2) /* PKE -> GPUIF */
{
if(BIT_MASK_GET(gpuif_stat, GPUIF_REG_STAT_APATH_B, GPUIF_REG_STAT_APATH_E) == 2)
any_stall = 1;
}
else if(what == chk_path3) /* DMA -> GPUIF */
{
if(BIT_MASK_GET(gpuif_stat, GPUIF_REG_STAT_APATH_B, GPUIF_REG_STAT_APATH_E) == 3)
any_stall = 1;
}
else
{
/* invalid what */
ASSERT(0);
}
/* any stall reasons? */
return any_stall;
}
/* flip the DBF bit; recompute TOPS, ITOP & TOP */
void
pke_flip_dbf(struct pke_device* me)
{
/* compute new ITOP and TOP */
PKE_REG_MASK_SET(me, ITOP, ITOP,
PKE_REG_MASK_GET(me, ITOPS, ITOPS));
PKE_REG_MASK_SET(me, TOP, TOP,
PKE_REG_MASK_GET(me, TOPS, TOPS));
/* flip DBF */
PKE_REG_MASK_SET(me, DBF, DF,
PKE_REG_MASK_GET(me, DBF, DF) ? 0 : 1);
PKE_REG_MASK_SET(me, STAT, DBF, PKE_REG_MASK_GET(me, DBF, DF));
/* compute new TOPS */
PKE_REG_MASK_SET(me, TOPS, TOPS,
(PKE_REG_MASK_GET(me, BASE, BASE) +
(PKE_REG_MASK_GET(me, DBF, DF) *
PKE_REG_MASK_GET(me, OFST, OFFSET))));
}
/* PKEcode handler functions -- responsible for checking and
confirming old stall conditions, executing pkecode, updating PC and
status registers -- may assume being run on correct PKE unit */
void
pke_code_nop(struct pke_device* me, unsigned_4 pkecode)
{
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_stcycl(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy immediate value into CYCLE reg */
PKE_REG_MASK_SET(me, CYCLE, WL, BIT_MASK_GET(imm, 8, 15));
PKE_REG_MASK_SET(me, CYCLE, CL, BIT_MASK_GET(imm, 0, 7));
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_offset(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy 10 bits to OFFSET field */
PKE_REG_MASK_SET(me, OFST, OFFSET, BIT_MASK_GET(imm, 0, 9));
/* clear DBF bit */
PKE_REG_MASK_SET(me, DBF, DF, 0);
/* clear other DBF bit */
PKE_REG_MASK_SET(me, STAT, DBF, 0);
/* set TOPS = BASE */
PKE_REG_MASK_SET(me, TOPS, TOPS, PKE_REG_MASK_GET(me, BASE, BASE));
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_base(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy 10 bits to BASE field */
PKE_REG_MASK_SET(me, BASE, BASE, BIT_MASK_GET(imm, 0, 9));
/* clear DBF bit */
PKE_REG_MASK_SET(me, DBF, DF, 0);
/* clear other DBF bit */
PKE_REG_MASK_SET(me, STAT, DBF, 0);
/* set TOPS = BASE */
PKE_REG_MASK_SET(me, TOPS, TOPS, PKE_REG_MASK_GET(me, BASE, BASE));
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_itop(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy 10 bits to ITOPS field */
PKE_REG_MASK_SET(me, ITOPS, ITOPS, BIT_MASK_GET(imm, 0, 9));
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_stmod(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy 2 bits to MODE register */
PKE_REG_MASK_SET(me, MODE, MDE, BIT_MASK_GET(imm, 0, 2));
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_mskpath3(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
unsigned_4 gif_mode;
/* set appropriate bit */
if(BIT_MASK_GET(imm, PKE_REG_MSKPATH3_B, PKE_REG_MSKPATH3_E) != 0)
gif_mode = GIF_REG_MODE_M3R_MASK;
else
gif_mode = 0;
/* write register; patrickm code will look at M3R bit only */
PKE_MEM_WRITE(me, GIF_REG_MODE, & gif_mode, 4);
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_pkemark(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* copy 16 bits to MARK register */
PKE_REG_MASK_SET(me, MARK, MARK, BIT_MASK_GET(imm, 0, 15));
/* set MRK bit in STAT register - CPU2 v2.1 docs incorrect */
PKE_REG_MASK_SET(me, STAT, MRK, 1);
/* done */
pke_pc_advance(me, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
}
void
pke_code_flushe(struct pke_device* me, unsigned_4 pkecode)
{
/* compute next PEW bit */
if(pke_check_stall(me, chk_vu))
{
/* VU busy */
PKE_REG_MASK_SET(me, STAT, PEW, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_STALL);
/* try again next cycle */
}
else
{
/* VU idle */
PKE_REG_MASK_SET(me, STAT, PEW, 0);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_flush(struct pke_device* me, unsigned_4 pkecode)
{
int something_busy = 0;
/* compute next PEW, PGW bits */
if(pke_check_stall(me, chk_vu))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PEW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PEW, 0);
if(pke_check_stall(me, chk_path1) ||
pke_check_stall(me, chk_path2))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PGW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PGW, 0);
/* go or no go */
if(something_busy)
{
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
else
{
/* all idle */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_flusha(struct pke_device* me, unsigned_4 pkecode)
{
int something_busy = 0;
/* compute next PEW, PGW bits */
if(pke_check_stall(me, chk_vu))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PEW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PEW, 0);
if(pke_check_stall(me, chk_path1) ||
pke_check_stall(me, chk_path2) ||
pke_check_stall(me, chk_path3))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PGW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PGW, 0);
if(something_busy)
{
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
else
{
/* all idle */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_pkemscal(struct pke_device* me, unsigned_4 pkecode)
{
/* compute next PEW bit */
if(pke_check_stall(me, chk_vu))
{
/* VU busy */
PKE_REG_MASK_SET(me, STAT, PEW, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_STALL);
/* try again next cycle */
}
else
{
unsigned_4 vu_pc;
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* VU idle */
PKE_REG_MASK_SET(me, STAT, PEW, 0);
/* flip DBF on PKE1 */
if(me->pke_number == 1)
pke_flip_dbf(me);
/* compute new PC for VU */
vu_pc = BIT_MASK_GET(imm, 0, 15);
/* write new PC; callback function gets VU running */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, (me->pke_number == 0 ? VU0_CIA : VU1_CIA),
& vu_pc,
4);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_pkemscnt(struct pke_device* me, unsigned_4 pkecode)
{
/* compute next PEW bit */
if(pke_check_stall(me, chk_vu))
{
/* VU busy */
PKE_REG_MASK_SET(me, STAT, PEW, 1);
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_STALL);
/* try again next cycle */
}
else
{
unsigned_4 vu_pc;
/* VU idle */
PKE_REG_MASK_SET(me, STAT, PEW, 0);
/* flip DBF on PKE1 */
if(me->pke_number == 1)
pke_flip_dbf(me);
/* read old PC */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_READ(me, (me->pke_number == 0 ? VU0_CIA : VU1_CIA),
& vu_pc,
4);
/* rewrite new PC; callback function gets VU running */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, (me->pke_number == 0 ? VU0_CIA : VU1_CIA),
& vu_pc,
4);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_pkemscalf(struct pke_device* me, unsigned_4 pkecode)
{
int something_busy = 0;
/* compute next PEW, PGW bits */
if(pke_check_stall(me, chk_vu))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PEW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PEW, 0);
if(pke_check_stall(me, chk_path1) ||
pke_check_stall(me, chk_path2) ||
pke_check_stall(me, chk_path3))
{
something_busy = 1;
PKE_REG_MASK_SET(me, STAT, PGW, 1);
}
else
PKE_REG_MASK_SET(me, STAT, PGW, 0);
/* go or no go */
if(something_busy)
{
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
else
{
unsigned_4 vu_pc;
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* flip DBF on PKE1 */
if(me->pke_number == 1)
pke_flip_dbf(me);
/* compute new PC for VU */
vu_pc = BIT_MASK_GET(imm, 0, 15);
/* rewrite new PC; callback function gets VU running */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, (me->pke_number == 0 ? VU0_CIA : VU1_CIA),
& vu_pc,
4);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
}
void
pke_code_stmask(struct pke_device* me, unsigned_4 pkecode)
{
/* check that FIFO has one more word for STMASK operand */
unsigned_4* mask;
mask = pke_pc_operand(me, 1);
if(mask != NULL)
{
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 1);
/* fill the register */
PKE_REG_MASK_SET(me, MASK, MASK, *mask);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 0);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 2);
}
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
}
void
pke_code_strow(struct pke_device* me, unsigned_4 pkecode)
{
/* check that FIFO has four more words for STROW operand */
unsigned_4* last_op;
last_op = pke_pc_operand(me, 4);
if(last_op != NULL)
{
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 1);
/* copy ROW registers: must all exist if 4th operand exists */
me->regs[PKE_REG_R0][0] = * pke_pc_operand(me, 1);
me->regs[PKE_REG_R1][0] = * pke_pc_operand(me, 2);
me->regs[PKE_REG_R2][0] = * pke_pc_operand(me, 3);
me->regs[PKE_REG_R3][0] = * pke_pc_operand(me, 4);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 0);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 5);
}
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
}
void
pke_code_stcol(struct pke_device* me, unsigned_4 pkecode)
{
/* check that FIFO has four more words for STCOL operand */
unsigned_4* last_op;
last_op = pke_pc_operand(me, 4);
if(last_op != NULL)
{
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 1);
/* copy COL registers: must all exist if 4th operand exists */
me->regs[PKE_REG_C0][0] = * pke_pc_operand(me, 1);
me->regs[PKE_REG_C1][0] = * pke_pc_operand(me, 2);
me->regs[PKE_REG_C2][0] = * pke_pc_operand(me, 3);
me->regs[PKE_REG_C3][0] = * pke_pc_operand(me, 4);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, 0);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 5);
}
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* try again next cycle */
}
}
void
pke_code_mpg(struct pke_device* me, unsigned_4 pkecode)
{
unsigned_4* last_mpg_word;
int num = BIT_MASK_GET(pkecode, PKE_OPCODE_NUM_B, PKE_OPCODE_NUM_E);
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* assert 64-bit alignment of MPG operand */
if(me->qw_pc != 3 && me->qw_pc != 1)
return pke_code_error(me, pkecode);
/* map zero to max+1 */
if(num==0) num=0x100;
/* check that FIFO has a few more words for MPG operand */
last_mpg_word = pke_pc_operand(me, num*2); /* num: number of 64-bit words */
if(last_mpg_word != NULL)
{
/* perform implied FLUSHE */
if(pke_check_stall(me, chk_vu))
{
/* VU busy */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_STALL);
/* retry this instruction next clock */
}
else
{
/* VU idle */
int i;
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, num);
/* transfer VU instructions, one word-pair per iteration */
for(i=0; i<num; i++)
{
address_word vu_addr_base, vu_addr;
address_word vutrack_addr_base, vutrack_addr;
address_word vu_addr_max_size;
unsigned_4 vu_lower_opcode, vu_upper_opcode;
unsigned_4* operand;
unsigned_4 source_addr;
struct fifo_quadword* fq;
int next_num;
/* decrement NUM */
next_num = PKE_REG_MASK_GET(me, NUM, NUM) - 1;
PKE_REG_MASK_SET(me, NUM, NUM, next_num);
/* imm: in 64-bit units for MPG instruction */
/* VU*_MEM0 : instruction memory */
vu_addr_base = (me->pke_number == 0) ?
VU0_MEM0_WINDOW_START : VU1_MEM0_WINDOW_START;
vu_addr_max_size = (me->pke_number == 0) ?
VU0_MEM0_SIZE : VU1_MEM0_SIZE;
vutrack_addr_base = (me->pke_number == 0) ?
VU0_MEM0_SRCADDR_START : VU1_MEM0_SRCADDR_START;
/* compute VU address for this word-pair */
vu_addr = vu_addr_base + (imm + i) * 8;
/* check for vu_addr overflow */
while(vu_addr >= vu_addr_base + vu_addr_max_size)
vu_addr -= vu_addr_max_size;
/* compute VU tracking address */
vutrack_addr = vutrack_addr_base + ((signed_8)vu_addr - (signed_8)vu_addr_base) / 2;
/* Fetch operand words; assume they are already little-endian for VU imem */
fq = pke_pc_fifo(me, i*2 + 1, & operand);
vu_lower_opcode = *operand;
vu_upper_opcode = *pke_pc_operand(me, i*2 + 2);
/* write data into VU memory */
/* lower (scalar) opcode comes in first word */
PKE_MEM_WRITE(me, vu_addr,
& vu_lower_opcode,
4);
/* upper (vector) opcode comes in second word */
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, vu_addr + 4,
& vu_upper_opcode,
4);
/* write tracking address in target byte-order */
source_addr = H2T_4(fq->source_address);
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, vutrack_addr,
& source_addr,
4);
} /* VU xfer loop */
/* check NUM */
ASSERT(PKE_REG_MASK_GET(me, NUM, NUM) == 0);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1 + num*2);
}
} /* if FIFO full enough */
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* retry this instruction next clock */
}
}
void
pke_code_direct(struct pke_device* me, unsigned_4 pkecode)
{
/* check that FIFO has a few more words for DIRECT operand */
unsigned_4* last_direct_word;
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
/* assert 128-bit alignment of DIRECT operand */
if(me->qw_pc != 3)
return pke_code_error(me, pkecode);
/* map zero to max+1 */
if(imm==0) imm=0x10000;
last_direct_word = pke_pc_operand(me, imm*4); /* imm: number of 128-bit words */
if(last_direct_word != NULL)
{
/* VU idle */
int i;
quadword fifo_data;
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* transfer GPUIF quadwords, one word per iteration */
for(i=0; i<imm*4; i++)
{
unsigned_4* operand = pke_pc_operand(me, 1+i);
/* collect word into quadword */
fifo_data[i % 4] = *operand;
/* write to GPUIF FIFO only with full quadword */
if(i % 4 == 3)
{
ASSERT(sizeof(fifo_data) == 16);
PKE_MEM_WRITE(me, GIF_PATH2_FIFO_ADDR,
fifo_data,
16);
} /* write collected quadword */
} /* GPUIF xfer loop */
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1 + imm*4);
} /* if FIFO full enough */
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* retry this instruction next clock */
}
}
void
pke_code_directhl(struct pke_device* me, unsigned_4 pkecode)
{
/* treat the same as DIRECTH */
pke_code_direct(me, pkecode);
}
void
pke_code_unpack(struct pke_device* me, unsigned_4 pkecode)
{
int imm = BIT_MASK_GET(pkecode, PKE_OPCODE_IMM_B, PKE_OPCODE_IMM_E);
int cmd = BIT_MASK_GET(pkecode, PKE_OPCODE_CMD_B, PKE_OPCODE_CMD_E);
int num = BIT_MASK_GET(pkecode, PKE_OPCODE_NUM_B, PKE_OPCODE_NUM_E);
short vn = BIT_MASK_GET(cmd, 2, 3); /* unpack shape controls */
short vl = BIT_MASK_GET(cmd, 0, 1);
int m = BIT_MASK_GET(cmd, 4, 4);
short cl = PKE_REG_MASK_GET(me, CYCLE, CL); /* cycle controls */
short wl = PKE_REG_MASK_GET(me, CYCLE, WL);
int r = BIT_MASK_GET(imm, 15, 15); /* indicator bits in imm value */
int usn = BIT_MASK_GET(imm, 14, 14);
int n, num_operands;
unsigned_4* last_operand_word = NULL;
/* compute PKEcode length, as given in CPU2 spec, v2.1 pg. 11 */
if(wl <= cl)
n = num;
else
n = cl * (num/wl) + PKE_LIMIT(num % wl, cl);
num_operands = ((32 >> vl) * (vn+1) * n)/32;
/* confirm that FIFO has enough words in it */
if(num_operands > 0)
last_operand_word = pke_pc_operand(me, num_operands);
if(last_operand_word != NULL || num_operands == 0)
{
address_word vu_addr_base, vutrack_addr_base;
address_word vu_addr_max_size;
int vector_num_out, vector_num_in;
/* "transferring" operand */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_XFER);
/* don't check whether VU is idle */
/* compute VU address base */
if(me->pke_number == 0)
{
vu_addr_base = VU0_MEM1_WINDOW_START + 16 * BIT_MASK_GET(imm, 0, 9);
vu_addr_max_size = VU0_MEM1_SIZE;
vutrack_addr_base = VU0_MEM1_SRCADDR_START + 4 * BIT_MASK_GET(imm, 0, 9);
}
else
{
vu_addr_base = VU1_MEM1_WINDOW_START + 16 * BIT_MASK_GET(imm, 0, 9);
vu_addr_max_size = VU1_MEM1_SIZE;
vutrack_addr_base = VU1_MEM1_SRCADDR_START + 4 * BIT_MASK_GET(imm, 0, 9);
if(r) /* double-buffering */
{
vu_addr_base += 16 * PKE_REG_MASK_GET(me, TOPS, TOPS);
vutrack_addr_base += 4 * PKE_REG_MASK_GET(me, TOPS, TOPS);
}
}
/* set NUM */
PKE_REG_MASK_SET(me, NUM, NUM, num == 0 ? 0x100 : num );
/* transfer given number of vectors */
vector_num_out = 0; /* output vector number being processed */
vector_num_in = 0; /* argument vector number being processed */
do
{
quadword vu_old_data;
quadword vu_new_data;
quadword unpacked_data;
address_word vu_addr;
address_word vutrack_addr;
unsigned_4 source_addr = 0;
int i;
int next_num;
/* decrement NUM */
next_num = PKE_REG_MASK_GET(me, NUM, NUM) - 1;
PKE_REG_MASK_SET(me, NUM, NUM, next_num);
/* compute VU destination address, as bytes in R5900 memory */
if(cl >= wl)
{
/* map zero to max+1 */
int addrwl = (wl == 0) ? 0x0100 : wl;
vu_addr = vu_addr_base + 16*(cl*(vector_num_out/addrwl) + (vector_num_out%addrwl));
}
else
vu_addr = vu_addr_base + 16*vector_num_out;
/* check for vu_addr overflow */
while(vu_addr >= vu_addr_base + vu_addr_max_size)
vu_addr -= vu_addr_max_size;
/* compute address of tracking table entry */
vutrack_addr = vutrack_addr_base + ((signed_8)vu_addr - (signed_8)vu_addr_base) / 4;
/* read old VU data word at address */
ASSERT(sizeof(vu_old_data) == 16);
PKE_MEM_READ(me, vu_addr,
vu_old_data,
16);
/* yank memory out of little-endian order */
for(i=0; i<4; i++)
vu_old_data[i] = LE2H_4(vu_old_data[i]);
/* For cyclic unpack, next operand quadword may come from instruction stream
or be zero. */
if((num == 0 && cl == 0 && wl == 0) || /* shortcut clear */
((cl < wl) && ((vector_num_out % wl) >= cl))) /* wl != 0, set above */
{
/* clear operand - used only in a "indeterminate" state */
for(i = 0; i < 4; i++)
unpacked_data[i] = 0;
}
else
{
/* compute packed vector dimensions */
int vectorbits, unitbits;
if(vl < 3) /* PKE_UNPACK_*_{32,16,8} */
{
unitbits = (32 >> vl);
vectorbits = unitbits * (vn+1);
}
else if(vl == 3 && vn == 3) /* PKE_UNPACK_V4_5 */
{
unitbits = 5;
vectorbits = 16;
}
else /* illegal unpack variant */
{
/* treat as illegal instruction */
pke_code_error(me, pkecode);
return;
}
/* loop over columns */
for(i=0; i<=vn; i++)
{
unsigned_4 operand;
/* offset in bits in current operand word */
int bitoffset =
(vector_num_in * vectorbits) + (i * unitbits); /* # of bits from PKEcode */
/* last unit of V4_5 is only one bit wide */
if(vl == 3 && vn == 3 && i == 3) /* PKE_UNPACK_V4_5 */
unitbits = 1;
/* fetch bitfield operand */
operand = pke_pc_operand_bits(me, bitoffset, unitbits, & source_addr);
/* selectively sign-extend; not for V4_5 1-bit value */
if(usn || unitbits == 1)
unpacked_data[i] = operand;
else
unpacked_data[i] = SEXT32(operand, unitbits-1);
}
/* consumed a vector from the PKE instruction stream */
vector_num_in ++;
} /* unpack word from instruction operand */
/* compute replacement word */
if(m) /* use mask register? */
{
/* compute index into mask register for this word */
int addrwl = (wl == 0) ? 0x0100 : wl;
int mask_index = PKE_LIMIT(vector_num_out % addrwl, 3);
for(i=0; i<4; i++) /* loop over columns */
{
int mask_op = PKE_MASKREG_GET(me, mask_index, i);
unsigned_4* masked_value = NULL;
unsigned_4 zero = 0;
switch(mask_op)
{
case PKE_MASKREG_INPUT:
/* for vn == 0, all columns are copied from column 0 */
if(vn == 0)
masked_value = & unpacked_data[0];
else if(i > vn)
masked_value = & zero; /* arbitrary data: undefined in spec */
else
masked_value = & unpacked_data[i];
break;
case PKE_MASKREG_ROW: /* exploit R0..R3 contiguity */
masked_value = & me->regs[PKE_REG_R0 + i][0];
break;
case PKE_MASKREG_COLUMN: /* exploit C0..C3 contiguity */
masked_value = & me->regs[PKE_REG_C0 + mask_index][0];
break;
case PKE_MASKREG_NOTHING:
/* "write inhibit" by re-copying old data */
masked_value = & vu_old_data[i];
break;
default:
ASSERT(0);
/* no other cases possible */
}
/* copy masked value for column */
vu_new_data[i] = *masked_value;
} /* loop over columns */
} /* mask */
else
{
/* no mask - just copy over entire unpacked quadword */
memcpy(vu_new_data, unpacked_data, sizeof(unpacked_data));
}
/* process STMOD register for accumulation operations */
switch(PKE_REG_MASK_GET(me, MODE, MDE))
{
case PKE_MODE_ADDROW: /* add row registers to output data */
for(i=0; i<4; i++)
/* exploit R0..R3 contiguity */
vu_new_data[i] += me->regs[PKE_REG_R0 + i][0];
break;
case PKE_MODE_ACCROW: /* add row registers to output data; accumulate */
for(i=0; i<4; i++)
{
/* exploit R0..R3 contiguity */
vu_new_data[i] += me->regs[PKE_REG_R0 + i][0];
me->regs[PKE_REG_R0 + i][0] = vu_new_data[i];
}
break;
case PKE_MODE_INPUT: /* pass data through */
default:
;
}
/* yank memory into little-endian order */
for(i=0; i<4; i++)
vu_new_data[i] = H2LE_4(vu_new_data[i]);
/* write replacement word */
ASSERT(sizeof(vu_new_data) == 16);
PKE_MEM_WRITE(me, vu_addr,
vu_new_data,
16);
/* write tracking address in target byte-order */
source_addr = H2T_4(source_addr);
ASSERT(sizeof(unsigned_4) == 4);
PKE_MEM_WRITE(me, vutrack_addr,
& source_addr,
4);
/* next vector please */
vector_num_out ++;
} /* vector transfer loop */
while(PKE_REG_MASK_GET(me, NUM, NUM) > 0);
/* done */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1 + num_operands);
} /* PKE FIFO full enough */
else
{
/* need to wait for another word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_WAIT);
/* retry this instruction next clock */
}
}
void
pke_code_error(struct pke_device* me, unsigned_4 pkecode)
{
/* set ER1 flag in STAT register */
PKE_REG_MASK_SET(me, STAT, ER1, 1);
/* advance over faulty word */
PKE_REG_MASK_SET(me, STAT, PPS, PKE_REG_STAT_PPS_IDLE);
pke_pc_advance(me, 1);
}
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