mirror of https://gitee.com/openkylin/qemu.git
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
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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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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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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_write() return value */
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qemu_chr_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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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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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 = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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uint8_t buf[16];
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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 = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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uint8_t buf[16];
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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,
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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 void vty_hcalls(VIOsPAPRBus *bus)
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{
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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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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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.hcalls = vty_hcalls,
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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_PROP_UINT32("reg", VIOsPAPRDevice, reg, 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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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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}
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device_init(spapr_vty_register);
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