aboutsummaryrefslogtreecommitdiff
path: root/hw/heathrow_pic.c
blob: 44dc97a2dcf449c8e7b6e00ab2eb0a80ddc0bbc0 (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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 * Heathrow PIC support (OldWorld PowerMac)
 *
 * Copyright (c) 2005-2007 Fabrice Bellard
 * Copyright (c) 2007 Jocelyn Mayer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "vl.h"
#include "ppc_mac.h"

//#define DEBUG

typedef struct HeathrowPIC {
    uint32_t events;
    uint32_t mask;
    uint32_t levels;
    uint32_t level_triggered;
} HeathrowPIC;

typedef struct HeathrowPICS {
    HeathrowPIC pics[2];
    qemu_irq *irqs;
} HeathrowPICS;

static inline int check_irq(HeathrowPIC *pic)
{
    return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
}

/* update the CPU irq state */
static void heathrow_pic_update(HeathrowPICS *s)
{
    if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) {
        qemu_irq_raise(s->irqs[0]);
    } else {
        qemu_irq_lower(s->irqs[0]);
    }
}

static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
    HeathrowPICS *s = opaque;
    HeathrowPIC *pic;
    unsigned int n;

#ifdef TARGET_WORDS_BIGENDIAN
    value = bswap32(value);
#endif
    n = ((addr & 0xfff) - 0x10) >> 4;
#ifdef DEBUG
    printf("pic_writel: " PADDRX " %u: %08x\n", addr, n, value);
#endif
    if (n >= 2)
        return;
    pic = &s->pics[n];
    switch(addr & 0xf) {
    case 0x04:
        pic->mask = value;
        heathrow_pic_update(s);
        break;
    case 0x08:
        /* do not reset level triggered IRQs */
        value &= ~pic->level_triggered;
        pic->events &= ~value;
        heathrow_pic_update(s);
        break;
    default:
        break;
    }
}

static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
{
    HeathrowPICS *s = opaque;
    HeathrowPIC *pic;
    unsigned int n;
    uint32_t value;

    n = ((addr & 0xfff) - 0x10) >> 4;
    if (n >= 2) {
        value = 0;
    } else {
        pic = &s->pics[n];
        switch(addr & 0xf) {
        case 0x0:
            value = pic->events;
            break;
        case 0x4:
            value = pic->mask;
            break;
        case 0xc:
            value = pic->levels;
            break;
        default:
            value = 0;
            break;
        }
    }
#ifdef DEBUG
    printf("pic_readl: " PADDRX " %u: %08x\n", addr, n, value);
#endif
#ifdef TARGET_WORDS_BIGENDIAN
    value = bswap32(value);
#endif
    return value;
}

static CPUWriteMemoryFunc *pic_write[] = {
    &pic_writel,
    &pic_writel,
    &pic_writel,
};

static CPUReadMemoryFunc *pic_read[] = {
    &pic_readl,
    &pic_readl,
    &pic_readl,
};


static void heathrow_pic_set_irq(void *opaque, int num, int level)
{
    HeathrowPICS *s = opaque;
    HeathrowPIC *pic;
    unsigned int irq_bit;

#if defined(DEBUG)
    {
        static int last_level[64];
        if (last_level[num] != level) {
            printf("set_irq: num=0x%02x level=%d\n", num, level);
            last_level[num] = level;
        }
    }
#endif
    pic = &s->pics[1 - (num >> 5)];
    irq_bit = 1 << (num & 0x1f);
    if (level) {
        pic->events |= irq_bit & ~pic->level_triggered;
        pic->levels |= irq_bit;
    } else {
        pic->levels &= ~irq_bit;
    }
    heathrow_pic_update(s);
}

qemu_irq *heathrow_pic_init(int *pmem_index,
                            int nb_cpus, qemu_irq **irqs)
{
    HeathrowPICS *s;

    s = qemu_mallocz(sizeof(HeathrowPICS));
    s->pics[0].level_triggered = 0;
    s->pics[1].level_triggered = 0x1ff00000;
    /* only 1 CPU */
    s->irqs = irqs[0];
    *pmem_index = cpu_register_io_memory(0, pic_read, pic_write, s);

    return qemu_allocate_irqs(heathrow_pic_set_irq, s, 64);
}