cpu/sh2/sh2.c

   1 #include <string.h>
   2 #include "sh2.h"
   3 #include "../debug.h"
   4 #include "compiler.h"
   5
   6 #define I 0xf0
   7
   8 SH2 *sh2; // active sh2
   9
  10 int sh2_init(SH2 *sh2, int is_slave)
  11 {
  12         int ret = 0;
  13
  14         memset(sh2, 0, sizeof(*sh2));
  15         sh2->is_slave = is_slave;
  16         pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
  17 #ifdef DRC_SH2
  18         ret = sh2_drc_init(sh2);
  19 #endif
  20         return ret;
  21 }
  22
  23 void sh2_finish(SH2 *sh2)
  24 {
  25 #ifdef DRC_SH2
  26         sh2_drc_finish(sh2);
  27 #endif
  28 }
  29
  30 void sh2_reset(SH2 *sh2)
  31 {
  32         sh2->pc = p32x_sh2_read32(0, sh2);
  33         sh2->r[15] = p32x_sh2_read32(4, sh2);
  34         sh2->sr = I;
  35         sh2->vbr = 0;
  36         sh2->pending_int_irq = 0;
  37 }
  38
  39 void sh2_do_irq(SH2 *sh2, int level, int vector)
  40 {
  41         sh2->r[15] -= 4;
  42         p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
  43         sh2->r[15] -= 4;
  44         p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
  45
  46         /* set I flags in SR */
  47         sh2->sr = (sh2->sr & ~I) | (level << 4);
  48
  49         /* fetch PC */
  50         sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  51
  52         /* 13 cycles at best */
  53         sh2->cycles_done += 13;
  54 //      sh2->icount -= 13;
  55 }
  56
  57 void sh2_irl_irq(SH2 *sh2, int level)
  58 {
  59         sh2->pending_irl = level;
  60         if (level > sh2->pending_int_irq)
  61                 sh2->pending_level = level;
  62         else
  63                 sh2->pending_level = sh2->pending_int_irq;
  64
  65         sh2->test_irq = 1;
  66 }
  67
  68 void sh2_internal_irq(SH2 *sh2, int level, int vector)
  69 {
  70         // FIXME: multiple internal irqs not handled..
  71         // assuming internal irqs never clear until accepted
  72         sh2->pending_int_irq = level;
  73         sh2->pending_int_vector = vector;
  74         if (level > sh2->pending_level)
  75                 sh2->pending_level = level;
  76
  77         sh2->test_irq = 1;
  78 }
  79