4 #include "hw/spapr_vio.h"
6 #define VTERM_BUFSIZE 16
8 typedef struct VIOsPAPRVTYDevice {
10 CharDriverState *chardev;
12 uint8_t buf[VTERM_BUFSIZE];
15 static int vty_can_receive(void *opaque)
17 VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
19 return (dev->in - dev->out) < VTERM_BUFSIZE;
22 static void vty_receive(void *opaque, const uint8_t *buf, int size)
24 VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
27 if ((dev->in == dev->out) && size) {
28 /* toggle line to simulate edge interrupt */
29 qemu_irq_pulse(dev->sdev.qirq);
31 for (i = 0; i < size; i++) {
32 assert((dev->in - dev->out) < VTERM_BUFSIZE);
33 dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];
37 static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)
39 VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
42 while ((n < max) && (dev->out != dev->in)) {
43 buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];
49 void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)
51 VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
53 /* FIXME: should check the qemu_chr_fe_write() return value */
54 qemu_chr_fe_write(dev->chardev, buf, len);
57 static int spapr_vty_init(VIOsPAPRDevice *sdev)
59 VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
62 fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n");
66 qemu_chr_add_handlers(dev->chardev, vty_can_receive,
67 vty_receive, NULL, dev);
72 /* Forward declaration */
73 static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg);
75 static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
76 target_ulong opcode, target_ulong *args)
78 target_ulong reg = args[0];
79 target_ulong len = args[1];
80 target_ulong char0_7 = args[2];
81 target_ulong char8_15 = args[3];
85 sdev = vty_lookup(spapr, reg);
94 *((uint64_t *)buf) = cpu_to_be64(char0_7);
95 *((uint64_t *)buf + 1) = cpu_to_be64(char8_15);
97 vty_putchars(sdev, buf, len);
102 static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr,
103 target_ulong opcode, target_ulong *args)
105 target_ulong reg = args[0];
106 target_ulong *len = args + 0;
107 target_ulong *char0_7 = args + 1;
108 target_ulong *char8_15 = args + 2;
109 VIOsPAPRDevice *sdev;
112 sdev = vty_lookup(spapr, reg);
117 *len = vty_getchars(sdev, buf, sizeof(buf));
119 memset(buf + *len, 0, 16 - *len);
122 *char0_7 = be64_to_cpu(*((uint64_t *)buf));
123 *char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));
128 void spapr_vty_create(VIOsPAPRBus *bus, uint32_t reg, CharDriverState *chardev)
132 dev = qdev_create(&bus->bus, "spapr-vty");
133 qdev_prop_set_uint32(dev, "reg", reg);
134 qdev_prop_set_chr(dev, "chardev", chardev);
135 qdev_init_nofail(dev);
138 static VIOsPAPRDeviceInfo spapr_vty_info = {
139 .init = spapr_vty_init,
142 .dt_compatible = "hvterm1",
143 .qdev.name = "spapr-vty",
144 .qdev.size = sizeof(VIOsPAPRVTYDevice),
145 .qdev.props = (Property[]) {
146 DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev, SPAPR_VTY_BASE_ADDRESS, 0),
147 DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
148 DEFINE_PROP_END_OF_LIST(),
152 VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus)
154 VIOsPAPRDevice *sdev, *selected;
158 * To avoid the console bouncing around we want one VTY to be
159 * the "default". We haven't really got anything to go on, so
160 * arbitrarily choose the one with the lowest reg value.
164 QTAILQ_FOREACH(iter, &bus->bus.children, sibling) {
165 /* Only look at VTY devices */
166 if (qdev_get_info(iter) != &spapr_vty_info.qdev) {
170 sdev = DO_UPCAST(VIOsPAPRDevice, qdev, iter);
172 /* First VTY we've found, so it is selected for now */
178 /* Choose VTY with lowest reg value */
179 if (sdev->reg < selected->reg) {
187 static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
189 VIOsPAPRDevice *sdev;
191 sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
192 if (!sdev && reg == 0) {
193 /* Hack for kernel early debug, which always specifies reg==0.
194 * We search all VIO devices, and grab the vty with the lowest
195 * reg. This attempts to mimic existing PowerVM behaviour
196 * (early debug does work there, despite having no vty with
198 return spapr_vty_get_default(spapr->vio_bus);
204 static void spapr_vty_register(void)
206 spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
207 spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);
208 spapr_vio_bus_register_withprop(&spapr_vty_info);
210 device_init(spapr_vty_register);