hw/sbi.c

   1 /*
   2  * QEMU Sparc SBI interrupt controller emulation
   3  *
   4  * Based on slavio_intctl, copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "sun4m.h"
  26 #include "console.h"
  27
  28 //#define DEBUG_IRQ
  29
  30 #ifdef DEBUG_IRQ
  31 #define DPRINTF(fmt, ...)                                       \
  32     do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
  33 #else
  34 #define DPRINTF(fmt, ...)
  35 #endif
  36
  37 #define MAX_CPUS 16
  38
  39 #define SBI_NREGS 16
  40
  41 typedef struct SBIState {
  42     uint32_t regs[SBI_NREGS];
  43     uint32_t intreg_pending[MAX_CPUS];
  44     qemu_irq *cpu_irqs[MAX_CPUS];
  45     uint32_t pil_out[MAX_CPUS];
  46 } SBIState;
  47
  48 #define SBI_SIZE (SBI_NREGS * 4)
  49
  50 static void sbi_check_interrupts(void *opaque)
  51 {
  52 }
  53
  54 static void sbi_set_irq(void *opaque, int irq, int level)
  55 {
  56 }
  57
  58 static void sbi_set_timer_irq_cpu(void *opaque, int cpu, int level)
  59 {
  60 }
  61
  62 static uint32_t sbi_mem_readl(void *opaque, target_phys_addr_t addr)
  63 {
  64     SBIState *s = opaque;
  65     uint32_t saddr, ret;
  66
  67     saddr = addr >> 2;
  68     switch (saddr) {
  69     default:
  70         ret = s->regs[saddr];
  71         break;
  72     }
  73     DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
  74
  75     return ret;
  76 }
  77
  78 static void sbi_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
  79 {
  80     SBIState *s = opaque;
  81     uint32_t saddr;
  82
  83     saddr = addr >> 2;
  84     DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
  85     switch (saddr) {
  86     default:
  87         s->regs[saddr] = val;
  88         break;
  89     }
  90 }
  91
  92 static CPUReadMemoryFunc *sbi_mem_read[3] = {
  93     NULL,
  94     NULL,
  95     sbi_mem_readl,
  96 };
  97
  98 static CPUWriteMemoryFunc *sbi_mem_write[3] = {
  99     NULL,
 100     NULL,
 101     sbi_mem_writel,
 102 };
 103
 104 static void sbi_save(QEMUFile *f, void *opaque)
 105 {
 106     SBIState *s = opaque;
 107     unsigned int i;
 108
 109     for (i = 0; i < MAX_CPUS; i++) {
 110         qemu_put_be32s(f, &s->intreg_pending[i]);
 111     }
 112 }
 113
 114 static int sbi_load(QEMUFile *f, void *opaque, int version_id)
 115 {
 116     SBIState *s = opaque;
 117     unsigned int i;
 118
 119     if (version_id != 1)
 120         return -EINVAL;
 121
 122     for (i = 0; i < MAX_CPUS; i++) {
 123         qemu_get_be32s(f, &s->intreg_pending[i]);
 124     }
 125     sbi_check_interrupts(s);
 126
 127     return 0;
 128 }
 129
 130 static void sbi_reset(void *opaque)
 131 {
 132     SBIState *s = opaque;
 133     unsigned int i;
 134
 135     for (i = 0; i < MAX_CPUS; i++) {
 136         s->intreg_pending[i] = 0;
 137     }
 138     sbi_check_interrupts(s);
 139 }
 140
 141 void *sbi_init(target_phys_addr_t addr, qemu_irq **irq, qemu_irq **cpu_irq,
 142                qemu_irq **parent_irq)
 143 {
 144     unsigned int i;
 145     int sbi_io_memory;
 146     SBIState *s;
 147
 148     s = qemu_mallocz(sizeof(SBIState));
 149
 150     for (i = 0; i < MAX_CPUS; i++) {
 151         s->cpu_irqs[i] = parent_irq[i];
 152     }
 153
 154     sbi_io_memory = cpu_register_io_memory(0, sbi_mem_read, sbi_mem_write, s);
 155     cpu_register_physical_memory(addr, SBI_SIZE, sbi_io_memory);
 156
 157     register_savevm("sbi", addr, 1, sbi_save, sbi_load, s);
 158     qemu_register_reset(sbi_reset, s);
 159     *irq = qemu_allocate_irqs(sbi_set_irq, s, 32);
 160     *cpu_irq = qemu_allocate_irqs(sbi_set_timer_irq_cpu, s, MAX_CPUS);
 161     sbi_reset(s);
 162
 163     return s;
 164 }