sh7750.c

qemu虚拟机代码

    qemu_chr_add_event_handler(chr, serial2_event);
}

static void init_serial_ports(SH7750State * s)
{
    init_serial1(s, 0);
    init_serial2(s, 1);
}

/**********************************************************************
 I/O ports
**********************************************************************/

int sh7750_register_io_device(SH7750State * s, sh7750_io_device * device)
{
    int i;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] == NULL) {
	    s->devices[i] = device;
	    return 0;
	}
    }
    return -1;
}

static uint16_t portdir(uint32_t v)
{
#define EVENPORTMASK(n) ((v & (1<<((n)<<1))) >> (n))
    return
	EVENPORTMASK(15) | EVENPORTMASK(14) | EVENPORTMASK(13) |
	EVENPORTMASK(12) | EVENPORTMASK(11) | EVENPORTMASK(10) |
	EVENPORTMASK(9) | EVENPORTMASK(8) | EVENPORTMASK(7) |
	EVENPORTMASK(6) | EVENPORTMASK(5) | EVENPORTMASK(4) |
	EVENPORTMASK(3) | EVENPORTMASK(2) | EVENPORTMASK(1) |
	EVENPORTMASK(0);
}

static uint16_t portpullup(uint32_t v)
{
#define ODDPORTMASK(n) ((v & (1<<(((n)<<1)+1))) >> (n))
    return
	ODDPORTMASK(15) | ODDPORTMASK(14) | ODDPORTMASK(13) |
	ODDPORTMASK(12) | ODDPORTMASK(11) | ODDPORTMASK(10) |
	ODDPORTMASK(9) | ODDPORTMASK(8) | ODDPORTMASK(7) | ODDPORTMASK(6) |
	ODDPORTMASK(5) | ODDPORTMASK(4) | ODDPORTMASK(3) | ODDPORTMASK(2) |
	ODDPORTMASK(1) | ODDPORTMASK(0);
}

static uint16_t porta_lines(SH7750State * s)
{
    return (s->portdira & s->pdtra) |	/* CPU */
	(s->periph_portdira & s->periph_pdtra) |	/* Peripherals */
	(~(s->portdira | s->periph_portdira) & s->portpullupa);	/* Pullups */
}

static uint16_t portb_lines(SH7750State * s)
{
    return (s->portdirb & s->pdtrb) |	/* CPU */
	(s->periph_portdirb & s->periph_pdtrb) |	/* Peripherals */
	(~(s->portdirb | s->periph_portdirb) & s->portpullupb);	/* Pullups */
}

static void gen_port_interrupts(SH7750State * s)
{
    /* XXXXX interrupts not generated */
}

static void porta_changed(SH7750State * s, uint16_t prev)
{
    uint16_t currenta, changes;
    int i, r = 0;

#if 0
    fprintf(stderr, "porta changed from 0x%04x to 0x%04x\n",
	    prev, porta_lines(s));
    fprintf(stderr, "pdtra=0x%04x, pctra=0x%08x\n", s->pdtra, s->pctra);
#endif
    currenta = porta_lines(s);
    if (currenta == prev)
	return;
    changes = currenta ^ prev;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] && (s->devices[i]->portamask_trigger & changes)) {
	    r |= s->devices[i]->port_change_cb(currenta, portb_lines(s),
					       &s->periph_pdtra,
					       &s->periph_portdira,
					       &s->periph_pdtrb,
					       &s->periph_portdirb);
	}
    }

    if (r)
	gen_port_interrupts(s);
}

static void portb_changed(SH7750State * s, uint16_t prev)
{
    uint16_t currentb, changes;
    int i, r = 0;

    currentb = portb_lines(s);
    if (currentb == prev)
	return;
    changes = currentb ^ prev;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] && (s->devices[i]->portbmask_trigger & changes)) {
	    r |= s->devices[i]->port_change_cb(portb_lines(s), currentb,
					       &s->periph_pdtra,
					       &s->periph_portdira,
					       &s->periph_pdtrb,
					       &s->periph_portdirb);
	}
    }

    if (r)
	gen_port_interrupts(s);
}

/**********************************************************************
 Memory
**********************************************************************/

static void error_access(const char *kind, target_phys_addr_t addr)
{
    fprintf(stderr, "%s to %s (0x%08x) not supported\n",
	    kind, regname(addr), addr);
}

static void ignore_access(const char *kind, target_phys_addr_t addr)
{
    fprintf(stderr, "%s to %s (0x%08x) ignored\n",
	    kind, regname(addr), addr);
}

static uint32_t sh7750_mem_readb(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;
    uint8_t r;

    switch (addr) {
    case SH7750_SCSSR1_A7:
	r = s->scssr1;
	s->scssr1_read |= r;
	return s->scssr1;
    case SH7750_SCRDR1_A7:
	s->scssr1 &= ~SH7750_SCSSR1_RDRF;
	return s->scrdr1;
    default:
	error_access("byte read", addr);
	assert(0);
    }
}

static uint32_t sh7750_mem_readw(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;
    uint16_t r;

    switch (addr) {
    case SH7750_RFCR_A7:
	fprintf(stderr,
		"Read access to refresh count register, incrementing\n");
	return s->rfcr++;
    case SH7750_TCR0_A7:
	return s->tcr0;
    case SH7750_SCLSR2_A7:
	/* Read and clear overflow bit */
	r = s->sclsr2;
	s->sclsr2 = 0;
	return r;
    case SH7750_SCSFR2_A7:
	return s->scfsr2;
    case SH7750_PDTRA_A7:
	return porta_lines(s);
    case SH7750_PDTRB_A7:
	return portb_lines(s);
    default:
	error_access("word read", addr);
	assert(0);
    }
}

static uint32_t sh7750_mem_readl(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;

    switch (addr) {
    case SH7750_MMUCR_A7:
	return s->cpu->mmucr;
    case SH7750_PTEH_A7:
	return s->cpu->pteh;
    case SH7750_PTEL_A7:
	return s->cpu->ptel;
    case SH7750_TTB_A7:
	return s->cpu->ttb;
    case SH7750_TEA_A7:
	return s->cpu->tea;
    case SH7750_TRA_A7:
	return s->cpu->tra;
    case SH7750_EXPEVT_A7:
	return s->cpu->expevt;
    case SH7750_INTEVT_A7:
	return s->cpu->intevt;
    case SH7750_CCR_A7:
	return s->ccr;
    case 0x1f000030:		/* Processor version PVR */
	return 0x00050000;	/* SH7750R */
    case 0x1f000040:		/* Processor version CVR */
	return 0x00110000;	/* Minimum caches */
    case 0x1f000044:		/* Processor version PRR */
	return 0x00000100;	/* SH7750R */
    default:
	error_access("long read", addr);
	assert(0);
    }
}

static void sh7750_mem_writeb(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;

    switch (addr) {
	/* PRECHARGE ? XXXXX */
    case SH7750_PRECHARGE0_A7:
    case SH7750_PRECHARGE1_A7:
	ignore_access("byte write", addr);
	return;
    case SH7750_SCBRR2_A7:
	s->scbrr2 = mem_value;
	return;
    case SH7750_TSTR_A7:
	s->tstr = mem_value;
	timer_start_changed(s);
	return;
    case SH7750_SCSCR1_A7:
	s->scscr1 = mem_value;
	scscr1_changed(s);
	return;
    case SH7750_SCSMR1_A7:
	s->scsmr1 = mem_value;
	return;
    case SH7750_SCBRR1_A7:
	s->scbrr1 = mem_value;
	return;
    case SH7750_SCTDR1_A7:
	s->scssr1 &= ~SH7750_SCSSR1_TEND;
	s->sctdr1 = mem_value;
	return;
    case SH7750_SCSSR1_A7:
	serial1_change_scssr1(s, mem_value);
	return;
    default:
	error_access("byte write", addr);
	assert(0);
    }
}

static void sh7750_mem_writew(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;
    uint16_t temp;

    switch (addr) {
	/* SDRAM controller */
    case SH7750_SCBRR1_A7:
    case SH7750_SCBRR2_A7:
    case SH7750_BCR2_A7:
    case SH7750_BCR3_A7:
    case SH7750_RTCOR_A7:
    case SH7750_RTCNT_A7:
    case SH7750_RTCSR_A7:
	ignore_access("word write", addr);
	return;
	/* IO ports */
    case SH7750_PDTRA_A7:
	temp = porta_lines(s);
	s->pdtra = mem_value;
	porta_changed(s, temp);
	return;
    case SH7750_PDTRB_A7:
	temp = portb_lines(s);
	s->pdtrb = mem_value;
	portb_changed(s, temp);
	return;
    case SH7750_RFCR_A7:
	fprintf(stderr, "Write access to refresh count register\n");
	s->rfcr = mem_value;
	return;
    case SH7750_SCLSR2_A7:
	s->sclsr2 = mem_value;
	return;
    case SH7750_SCSCR2_A7:
	s->scscr2 = mem_value;
	scscr2_changed(s);
	return;
    case SH7750_SCFCR2_A7:
	s->scfcr2 = mem_value;
	return;
    case SH7750_SCSMR2_A7:
	s->scsmr2 = mem_value;
	return;
    case SH7750_TCR0_A7:
	s->tcr0 = mem_value;
	return;
    case SH7750_GPIOIC_A7:
	s->gpioic = mem_value;
	if (mem_value != 0) {
	    fprintf(stderr, "I/O interrupts not implemented\n");
	    assert(0);
	}
	return;
    default:
	error_access("word write", addr);
	assert(0);
    }
}

static void sh7750_mem_writel(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;
    uint16_t temp;

    switch (addr) {
	/* SDRAM controller */
    case SH7750_BCR1_A7:
    case SH7750_BCR4_A7:
    case SH7750_WCR1_A7:
    case SH7750_WCR2_A7:
    case SH7750_WCR3_A7:
    case SH7750_MCR_A7:
	ignore_access("long write", addr);
	return;
	/* IO ports */
    case SH7750_PCTRA_A7:
	temp = porta_lines(s);
	s->pctra = mem_value;
	s->portdira = portdir(mem_value);
	s->portpullupa = portpullup(mem_value);
	porta_changed(s, temp);
	return;
    case SH7750_PCTRB_A7:
	temp = portb_lines(s);
	s->pctrb = mem_value;
	s->portdirb = portdir(mem_value);
	s->portpullupb = portpullup(mem_value);
	portb_changed(s, temp);
	return;
    case SH7750_TCNT0_A7:
	s->tcnt0 = mem_value & 0xf;
	return;
    case SH7750_MMUCR_A7:
	s->cpu->mmucr = mem_value;
	return;
    case SH7750_PTEH_A7:
	s->cpu->pteh = mem_value;
	return;
    case SH7750_PTEL_A7:
	s->cpu->ptel = mem_value;
	return;
    case SH7750_TTB_A7:
	s->cpu->ttb = mem_value;
	return;
    case SH7750_TEA_A7:
	s->cpu->tea = mem_value;
	return;
    case SH7750_TRA_A7:
	s->cpu->tra = mem_value & 0x000007ff;
	return;
    case SH7750_EXPEVT_A7:
	s->cpu->expevt = mem_value & 0x000007ff;
	return;
    case SH7750_INTEVT_A7:
	s->cpu->intevt = mem_value & 0x000007ff;
	return;
    case SH7750_CCR_A7:
	s->ccr = mem_value;
	return;
    default:
	error_access("long write", addr);
	assert(0);
    }
}

static CPUReadMemoryFunc *sh7750_mem_read[] = {
    sh7750_mem_readb,
    sh7750_mem_readw,
    sh7750_mem_readl
};

static CPUWriteMemoryFunc *sh7750_mem_write[] = {
    sh7750_mem_writeb,
    sh7750_mem_writew,
    sh7750_mem_writel
};

SH7750State *sh7750_init(CPUSH4State * cpu)
{
    SH7750State *s;
    int sh7750_io_memory;

    s = qemu_mallocz(sizeof(SH7750State));
    s->cpu = cpu;
    s->periph_freq = 60000000;	/* 60MHz */
    sh7750_io_memory = cpu_register_io_memory(0,
					      sh7750_mem_read,
					      sh7750_mem_write, s);
    cpu_register_physical_memory(0x1c000000, 0x04000000, sh7750_io_memory);
    init_timers(s);
    init_serial_ports(s);
    return s;
}