cpu/sh2/sh2.c

   1 #include <string.h>
   2 #include <stddef.h>
   3
   4 #include "sh2.h"
   5 #include "../debug.h"
   6 #include "compiler.h"
   7
   8 #define I 0xf0
   9
  10 SH2 *sh2; // active sh2
  11
  12 int sh2_init(SH2 *sh2, int is_slave)
  13 {
  14         int ret = 0;
  15
  16         memset(sh2, 0, sizeof(*sh2));
  17         sh2->is_slave = is_slave;
  18         pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
  19 #ifdef DRC_SH2
  20         ret = sh2_drc_init(sh2);
  21 #endif
  22         return ret;
  23 }
  24
  25 void sh2_finish(SH2 *sh2)
  26 {
  27 #ifdef DRC_SH2
  28         sh2_drc_finish(sh2);
  29 #endif
  30 }
  31
  32 void sh2_reset(SH2 *sh2)
  33 {
  34         sh2->pc = p32x_sh2_read32(0, sh2);
  35         sh2->r[15] = p32x_sh2_read32(4, sh2);
  36         sh2->sr = I;
  37         sh2->vbr = 0;
  38         sh2->pending_int_irq = 0;
  39 }
  40
  41 void sh2_do_irq(SH2 *sh2, int level, int vector)
  42 {
  43         sh2->r[15] -= 4;
  44         p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
  45         sh2->r[15] -= 4;
  46         p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
  47
  48         /* set I flags in SR */
  49         sh2->sr = (sh2->sr & ~I) | (level << 4);
  50
  51         /* fetch PC */
  52         sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  53
  54         /* 13 cycles at best */
  55         sh2->cycles_done += 13;
  56 //      sh2->icount -= 13;
  57 }
  58
  59 void sh2_irl_irq(SH2 *sh2, int level, int nested_call)
  60 {
  61         sh2->pending_irl = level;
  62         if (level < sh2->pending_int_irq)
  63                 level = sh2->pending_int_irq;
  64         sh2->pending_level = level;
  65
  66         if (!nested_call) {
  67                 // not in memhandler, so handle this now (recompiler friendly)
  68                 // do this to avoid missing irqs that other SH2 might clear
  69                 if (level > ((sh2->sr >> 4) & 0x0f)) {
  70                         int vector = sh2->irq_callback(sh2, level);
  71                         sh2_do_irq(sh2, level, vector);
  72                 }
  73         }
  74         else
  75                 sh2->test_irq = 1;
  76 }
  77
  78 void sh2_internal_irq(SH2 *sh2, int level, int vector)
  79 {
  80         // FIXME: multiple internal irqs not handled..
  81         // assuming internal irqs never clear until accepted
  82         sh2->pending_int_irq = level;
  83         sh2->pending_int_vector = vector;
  84         if (level > sh2->pending_level)
  85                 sh2->pending_level = level;
  86
  87         sh2->test_irq = 1;
  88 }
  89
  90 #define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
  91
  92 void sh2_pack(const SH2 *sh2, unsigned char *buff)
  93 {
  94         unsigned int *p;
  95
  96         memcpy(buff, sh2, SH2_REG_SIZE);
  97         p = (void *)(buff + SH2_REG_SIZE);
  98
  99         p[0] = sh2->pending_int_irq;
 100         p[1] = sh2->pending_int_vector;
 101         p[2] = sh2->cycles_aim;
 102         p[3] = sh2->cycles_done;
 103 }
 104
 105 void sh2_unpack(SH2 *sh2, const unsigned char *buff)
 106 {
 107         unsigned int *p;
 108
 109         memcpy(sh2, buff, SH2_REG_SIZE);
 110         p = (void *)(buff + SH2_REG_SIZE);
 111
 112         sh2->pending_int_irq = p[0];
 113         sh2->pending_int_vector = p[1];
 114         sh2->cycles_aim = p[2];
 115         sh2->cycles_done = p[3];
 116 }
 117