summaryrefslogtreecommitdiff
path: root/hw/spapr_vty.c
blob: 6fc0105eac2b5e0a23565c48649c85892faf4539 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
#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_write() return value */
    qemu_chr_write(dev->chardev, buf, len);
}

static int spapr_vty_init(VIOsPAPRDevice *sdev)
{
    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;

    qemu_chr_add_handlers(dev->chardev, vty_can_receive,
                          vty_receive, NULL, dev);

    return 0;
}

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 = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    uint8_t buf[16];

    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 = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    uint8_t buf[16];

    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,
                      qemu_irq qirq, uint32_t vio_irq_num)
{
    DeviceState *dev;
    VIOsPAPRDevice *sdev;

    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);
    sdev = (VIOsPAPRDevice *)dev;
    sdev->qirq = qirq;
    sdev->vio_irq_num = vio_irq_num;
}

static void vty_hcalls(VIOsPAPRBus *bus)
{
    spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
    spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);
}

static VIOsPAPRDeviceInfo spapr_vty = {
    .init = spapr_vty_init,
    .dt_name = "vty",
    .dt_type = "serial",
    .dt_compatible = "hvterm1",
    .hcalls = vty_hcalls,
    .qdev.name = "spapr-vty",
    .qdev.size = sizeof(VIOsPAPRVTYDevice),
    .qdev.props = (Property[]) {
        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0),
        DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
        DEFINE_PROP_END_OF_LIST(),
    },
};

static void spapr_vty_register(void)
{
    spapr_vio_bus_register_withprop(&spapr_vty);
}
device_init(spapr_vty_register);