sh_ipl_g.cc Source File

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sh_ipl_g.cc
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1 /*
2  * Copyright (C) 2007-2009 Anders Gavare. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * 1. Redistributions of source code must retain the above copyright
8  * notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  * notice, this list of conditions and the following disclaimer in the
11  * documentation and/or other materials provided with the distribution.
12  * 3. The name of the author may not be used to endorse or promote products
13  * derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  *
28  * COMMENT: SH-IPL+G emulation
29  *
30  * Very basic, only what is needed to get OpenBSD/landisk booting.
31  * (SH-IPL+G stands for SuperH Initial Program Loader + GDB stub.)
32  */
33 
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <sys/types.h>
38 
39 #include "cpu.h"
40 #include "cpu_sh.h"
41 #include "machine.h"
42 #include "memory.h"
43 #include "misc.h"
44 
46 
47 
48 /*
49  * sh_ipl_g_emul_init():
50  */
52 {
53  struct cpu *cpu = machine->cpus[0];
54 
55  cpu->cd.sh.vbr = 0x8c000000;
56  store_16bit_word(cpu, 0x8c000100, SH_INVALID_INSTR);
57  store_16bit_word(cpu, 0x8c000102, 0x002b); /* rte */
58  store_16bit_word(cpu, 0x8c000104, 0x0009); /* nop */
59 }
60 
61 
62 /*
63  * sh_ipl_g_promcall():
64  *
65  * SH-IPL+G PROM call emulation.
66  */
67 static int sh_ipl_g_promcall(struct cpu *cpu)
68 {
69  /*
70  * SH-IPL+G call numbers are in R0:
71  *
72  * NOTE: r_bank[0], since this is in a trap handler!
73  */
74  switch (cpu->cd.sh.r_bank[0]) {
75 
76  case 4: /* Get memory size. */
77  cpu->cd.sh.r_bank[0] = 64 * 1048576;
78  /* Note: cpu->machine->physical_ram_in_mb * 1048576
79  would be more correct, but physical_ram_in_mb is
80  set to 2 for landisk emulation... */
81  break;
82 
83  default:cpu_register_dump(cpu->machine, cpu, 1, 0);
84  printf("\n");
85  fatal("[ SH-IPL+G PROM emulation: unimplemented function 0x%"
86  PRIx32" ]\n", cpu->cd.sh.r_bank[0]);
87  cpu->running = 0;
88  return 0;
89  }
90 
91  return 1;
92 }
93 
94 
95 /*
96  * sh_ipl_g_emul():
97  */
98 int sh_ipl_g_emul(struct cpu *cpu)
99 {
100  /* SH-IPL+G calls are "trapa #63": */
101  if (cpu->cd.sh.expevt == EXPEVT_TRAPA &&
102  cpu->cd.sh.tra == 0xfc) {
103  return sh_ipl_g_promcall(cpu);
104  } else {
105  cpu_register_dump(cpu->machine, cpu, 1, 0);
106  printf("\n");
107  fatal("[ SH-IPL+G PROM emulation: expevt=0x%x, "
108  " tra=0x%x ]\n", (int)cpu->cd.sh.expevt,
109  (int)cpu->cd.sh.tra);
110  cpu->running = 0;
111  return 0;
112  }
113 }
114 
uint32_t r_bank[SH_N_GPRS_BANKED]
Definition: cpu_sh.h:101
void fatal(const char *fmt,...)
Definition: main.cc:152
uint32_t expevt
Definition: cpu_sh.h:139
uint32_t vbr
Definition: cpu_sh.h:116
union cpu::@1 cd
int sh_ipl_g_emul(struct cpu *cpu)
Definition: sh_ipl_g.cc:98
struct machine * machine
Definition: cpu.h:328
uint32_t tra
Definition: cpu_sh.h:138
struct cpu ** cpus
Definition: machine.h:140
uint8_t running
Definition: cpu.h:353
void cpu_register_dump(struct machine *m, struct cpu *cpu, int gprs, int coprocs)
Definition: cpu.cc:203
Definition: cpu.h:326
int store_16bit_word(struct cpu *cpu, uint64_t addr, uint64_t data16)
Definition: memory.cc:807
#define EXPEVT_TRAPA
Definition: sh4_exception.h:70
#define SH_INVALID_INSTR
Definition: cpu_sh.h:93
void sh_ipl_g_emul_init(struct machine *machine)
Definition: sh_ipl_g.cc:51
struct sh_cpu sh
Definition: cpu.h:445

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