root / hw / spapr_vty.c @ 94afdadc
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#include "qdev.h" |
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#include "qemu-char.h" |
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#include "hw/spapr.h" |
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#include "hw/spapr_vio.h" |
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#define VTERM_BUFSIZE 16 |
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typedef struct VIOsPAPRVTYDevice { |
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VIOsPAPRDevice sdev; |
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CharDriverState *chardev; |
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uint32_t in, out; |
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uint8_t buf[VTERM_BUFSIZE]; |
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} VIOsPAPRVTYDevice; |
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|
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static int vty_can_receive(void *opaque) |
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{ |
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VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque; |
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return (dev->in - dev->out) < VTERM_BUFSIZE;
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} |
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static void vty_receive(void *opaque, const uint8_t *buf, int size) |
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{ |
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VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque; |
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int i;
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if ((dev->in == dev->out) && size) {
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/* toggle line to simulate edge interrupt */
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qemu_irq_pulse(dev->sdev.qirq); |
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} |
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for (i = 0; i < size; i++) { |
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assert((dev->in - dev->out) < VTERM_BUFSIZE); |
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dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i]; |
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} |
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} |
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static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max) |
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{ |
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VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev; |
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int n = 0; |
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while ((n < max) && (dev->out != dev->in)) {
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buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE]; |
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} |
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return n;
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} |
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void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len) |
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{ |
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VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev; |
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/* FIXME: should check the qemu_chr_fe_write() return value */
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qemu_chr_fe_write(dev->chardev, buf, len); |
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} |
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static int spapr_vty_init(VIOsPAPRDevice *sdev) |
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{ |
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VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev; |
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if (!dev->chardev) {
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fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n");
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exit(1);
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} |
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qemu_chr_add_handlers(dev->chardev, vty_can_receive, |
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vty_receive, NULL, dev);
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return 0; |
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} |
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/* Forward declaration */
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static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg);
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static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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target_ulong reg = args[0];
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target_ulong len = args[1];
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target_ulong char0_7 = args[2];
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target_ulong char8_15 = args[3];
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VIOsPAPRDevice *sdev; |
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uint8_t buf[16];
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sdev = vty_lookup(spapr, reg); |
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if (!sdev) {
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return H_PARAMETER;
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} |
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if (len > 16) { |
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return H_PARAMETER;
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} |
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*((uint64_t *)buf) = cpu_to_be64(char0_7); |
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*((uint64_t *)buf + 1) = cpu_to_be64(char8_15);
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vty_putchars(sdev, buf, len); |
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return H_SUCCESS;
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} |
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static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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target_ulong reg = args[0];
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target_ulong *len = args + 0;
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target_ulong *char0_7 = args + 1;
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target_ulong *char8_15 = args + 2;
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VIOsPAPRDevice *sdev; |
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uint8_t buf[16];
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sdev = vty_lookup(spapr, reg); |
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if (!sdev) {
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return H_PARAMETER;
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} |
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*len = vty_getchars(sdev, buf, sizeof(buf));
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if (*len < 16) { |
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memset(buf + *len, 0, 16 - *len); |
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} |
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*char0_7 = be64_to_cpu(*((uint64_t *)buf)); |
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*char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));
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return H_SUCCESS;
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} |
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void spapr_vty_create(VIOsPAPRBus *bus, uint32_t reg, CharDriverState *chardev)
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{ |
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DeviceState *dev; |
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dev = qdev_create(&bus->bus, "spapr-vty");
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qdev_prop_set_uint32(dev, "reg", reg);
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qdev_prop_set_chr(dev, "chardev", chardev);
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qdev_init_nofail(dev); |
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} |
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static VIOsPAPRDeviceInfo spapr_vty = {
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.init = spapr_vty_init, |
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.dt_name = "vty",
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.dt_type = "serial",
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.dt_compatible = "hvterm1",
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.qdev.name = "spapr-vty",
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.qdev.size = sizeof(VIOsPAPRVTYDevice),
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.qdev.props = (Property[]) { |
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DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev, SPAPR_VTY_BASE_ADDRESS, 0),
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DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
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DEFINE_PROP_END_OF_LIST(), |
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}, |
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}; |
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VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus) |
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{ |
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VIOsPAPRDevice *sdev, *selected; |
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DeviceState *iter; |
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/*
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* To avoid the console bouncing around we want one VTY to be
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* the "default". We haven't really got anything to go on, so
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* arbitrarily choose the one with the lowest reg value.
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*/
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selected = NULL;
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QTAILQ_FOREACH(iter, &bus->bus.children, sibling) { |
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/* Only look at VTY devices */
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if (qdev_get_info(iter) != &spapr_vty.qdev) {
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continue;
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} |
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sdev = DO_UPCAST(VIOsPAPRDevice, qdev, iter); |
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/* First VTY we've found, so it is selected for now */
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if (!selected) {
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selected = sdev; |
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continue;
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} |
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/* Choose VTY with lowest reg value */
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if (sdev->reg < selected->reg) {
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selected = sdev; |
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} |
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} |
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return selected;
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} |
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static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
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{ |
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VIOsPAPRDevice *sdev; |
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sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); |
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if (!sdev && reg == 0) { |
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/* Hack for kernel early debug, which always specifies reg==0.
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* We search all VIO devices, and grab the vty with the lowest
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* reg. This attempts to mimic existing PowerVM behaviour
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* (early debug does work there, despite having no vty with
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* reg==0. */
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return spapr_vty_get_default(spapr->vio_bus);
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} |
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return sdev;
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} |
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static void spapr_vty_register(void) |
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{ |
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spapr_vio_bus_register_withprop(&spapr_vty); |
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spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char); |
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spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char); |
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} |
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device_init(spapr_vty_register); |