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#include "qdev.h"
#include "qemu-char.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#define VTERM_BUFSIZE 16
typedef struct VIOsPAPRVTYDevice {
VIOsPAPRDevice sdev;
CharDriverState *chardev;
uint32_t in, out;
uint8_t buf[VTERM_BUFSIZE];
} VIOsPAPRVTYDevice;
static int vty_can_receive(void *opaque)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
return (dev->in - dev->out) < VTERM_BUFSIZE;
}
static void vty_receive(void *opaque, const uint8_t *buf, int size)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
int i;
if ((dev->in == dev->out) && size) {
/* toggle line to simulate edge interrupt */
qemu_irq_pulse(dev->sdev.qirq);
}
for (i = 0; i < size; i++) {
assert((dev->in - dev->out) < VTERM_BUFSIZE);
dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];
}
}
static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
int n = 0;
while ((n < max) && (dev->out != dev->in)) {
buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];
}
return n;
}
void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
/* FIXME: should check the qemu_chr_fe_write() return value */
qemu_chr_fe_write(dev->chardev, buf, len);
}
static int spapr_vty_init(VIOsPAPRDevice *sdev)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
if (!dev->chardev) {
fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n");
exit(1);
}
qemu_chr_add_handlers(dev->chardev, vty_can_receive,
vty_receive, NULL, dev);
return 0;
}
/* Forward declaration */
static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg);
static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong len = args[1];
target_ulong char0_7 = args[2];
target_ulong char8_15 = args[3];
VIOsPAPRDevice *sdev;
uint8_t buf[16];
sdev = vty_lookup(spapr, reg);
if (!sdev) {
return H_PARAMETER;
}
if (len > 16) {
return H_PARAMETER;
}
*((uint64_t *)buf) = cpu_to_be64(char0_7);
*((uint64_t *)buf + 1) = cpu_to_be64(char8_15);
vty_putchars(sdev, buf, len);
return H_SUCCESS;
}
static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong *len = args + 0;
target_ulong *char0_7 = args + 1;
target_ulong *char8_15 = args + 2;
VIOsPAPRDevice *sdev;
uint8_t buf[16];
sdev = vty_lookup(spapr, reg);
if (!sdev) {
return H_PARAMETER;
}
*len = vty_getchars(sdev, buf, sizeof(buf));
if (*len < 16) {
memset(buf + *len, 0, 16 - *len);
}
*char0_7 = be64_to_cpu(*((uint64_t *)buf));
*char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));
return H_SUCCESS;
}
void spapr_vty_create(VIOsPAPRBus *bus, uint32_t reg, CharDriverState *chardev)
{
DeviceState *dev;
dev = qdev_create(&bus->bus, "spapr-vty");
qdev_prop_set_uint32(dev, "reg", reg);
qdev_prop_set_chr(dev, "chardev", chardev);
qdev_init_nofail(dev);
}
static VIOsPAPRDeviceInfo spapr_vty = {
.init = spapr_vty_init,
.dt_name = "vty",
.dt_type = "serial",
.dt_compatible = "hvterm1",
.qdev.name = "spapr-vty",
.qdev.size = sizeof(VIOsPAPRVTYDevice),
.qdev.props = (Property[]) {
DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev, SPAPR_VTY_BASE_ADDRESS, 0),
DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
DEFINE_PROP_END_OF_LIST(),
},
};
VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus)
{
VIOsPAPRDevice *sdev, *selected;
DeviceState *iter;
/*
* To avoid the console bouncing around we want one VTY to be
* the "default". We haven't really got anything to go on, so
* arbitrarily choose the one with the lowest reg value.
*/
selected = NULL;
QTAILQ_FOREACH(iter, &bus->bus.children, sibling) {
/* Only look at VTY devices */
if (iter->info != &spapr_vty.qdev) {
continue;
}
sdev = DO_UPCAST(VIOsPAPRDevice, qdev, iter);
/* First VTY we've found, so it is selected for now */
if (!selected) {
selected = sdev;
continue;
}
/* Choose VTY with lowest reg value */
if (sdev->reg < selected->reg) {
selected = sdev;
}
}
return selected;
}
static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
{
VIOsPAPRDevice *sdev;
sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!sdev && reg == 0) {
/* Hack for kernel early debug, which always specifies reg==0.
* We search all VIO devices, and grab the vty with the lowest
* reg. This attempts to mimic existing PowerVM behaviour
* (early debug does work there, despite having no vty with
* reg==0. */
return spapr_vty_get_default(spapr->vio_bus);
}
return sdev;
}
static void spapr_vty_register(void)
{
spapr_vio_bus_register_withprop(&spapr_vty);
spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);
}
device_init(spapr_vty_register);
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