mips_r4k.c revision bcde1092aca184dbd7860078af020de7d1e4e22f 
1/*
2 * QEMU/MIPS pseudo-board
3 *
4 * emulates a simple machine with ISA-like bus.
5 * ISA IO space mapped to the 0x14000000 (PHYS) and
6 * ISA memory at the 0x10000000 (PHYS, 16Mb in size).
7 * All peripherial devices are attached to this "bus" with
8 * the standard PC ISA addresses.
9*/
10#include "hw/hw.h"
11#include "hw/mips/mips.h"
12#include "hw/i386/pc.h"
13#include "hw/isa/isa.h"
14#include "net/net.h"
15#include "sysemu/sysemu.h"
16#include "hw/boards.h"
17#include "flash.h"
18#include "qemu/log.h"
19#include "hw/mips/bios.h"
20#include "ide.h"
21#include "loader.h"
22#include "elf.h"
23
24#define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
25
26#define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
27
28#define MAX_IDE_BUS 2
29
30static const int ide_iobase[2] = { 0x1f0, 0x170 };
31static const int ide_iobase2[2] = { 0x3f6, 0x376 };
32static const int ide_irq[2] = { 14, 15 };
33
34static PITState *pit; /* PIT i8254 */
35
36/* i8254 PIT is attached to the IRQ0 at PIC i8259 */
37
38static struct _loaderparams {
39    int ram_size;
40    const char *kernel_filename;
41    const char *kernel_cmdline;
42    const char *initrd_filename;
43} loaderparams;
44
45static void mips_qemu_writel (void *opaque, hwaddr addr,
46			      uint32_t val)
47{
48    if ((addr & 0xffff) == 0 && val == 42)
49        qemu_system_reset_request ();
50    else if ((addr & 0xffff) == 4 && val == 42)
51        qemu_system_shutdown_request ();
52}
53
54static uint32_t mips_qemu_readl (void *opaque, hwaddr addr)
55{
56    return 0;
57}
58
59static CPUWriteMemoryFunc * const mips_qemu_write[] = {
60    &mips_qemu_writel,
61    &mips_qemu_writel,
62    &mips_qemu_writel,
63};
64
65static CPUReadMemoryFunc * const mips_qemu_read[] = {
66    &mips_qemu_readl,
67    &mips_qemu_readl,
68    &mips_qemu_readl,
69};
70
71static int mips_qemu_iomemtype = 0;
72
73typedef struct ResetData {
74    CPUState *env;
75    uint64_t vector;
76} ResetData;
77
78static int64_t load_kernel(void)
79{
80    int64_t entry, kernel_low, kernel_high;
81    long kernel_size, initrd_size, params_size;
82    ram_addr_t initrd_offset;
83    uint32_t *params_buf;
84    int big_endian;
85
86#ifdef TARGET_WORDS_BIGENDIAN
87    big_endian = 1;
88#else
89    big_endian = 0;
90#endif
91    kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
92                           (uint64_t *)&entry, (uint64_t *)&kernel_low,
93                           (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
94    if (kernel_size >= 0) {
95        if ((entry & ~0x7fffffffULL) == 0x80000000)
96            entry = (int32_t)entry;
97    } else {
98        fprintf(stderr, "qemu: could not load kernel '%s'\n",
99                loaderparams.kernel_filename);
100        exit(1);
101    }
102
103    /* load initrd */
104    initrd_size = 0;
105    initrd_offset = 0;
106    if (loaderparams.initrd_filename) {
107        initrd_size = get_image_size (loaderparams.initrd_filename);
108        if (initrd_size > 0) {
109            initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
110            if (initrd_offset + initrd_size > ram_size) {
111                fprintf(stderr,
112                        "qemu: memory too small for initial ram disk '%s'\n",
113                        loaderparams.initrd_filename);
114                exit(1);
115            }
116            initrd_size = load_image_targphys(loaderparams.initrd_filename,
117                                              initrd_offset,
118                                              ram_size - initrd_offset);
119        }
120        if (initrd_size == (target_ulong) -1) {
121            fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
122                    loaderparams.initrd_filename);
123            exit(1);
124        }
125    }
126
127    /* Store command line.  */
128    params_size = 264;
129    params_buf = qemu_malloc(params_size);
130
131    params_buf[0] = tswap32(ram_size);
132    params_buf[1] = tswap32(0x12345678);
133
134    if (initrd_size > 0) {
135        snprintf((char *)params_buf + 8, 256, "rd_start=0x" TARGET_FMT_lx " rd_size=%li %s",
136                 PHYS_TO_VIRT((uint32_t)initrd_offset),
137                 initrd_size, loaderparams.kernel_cmdline);
138    } else {
139        snprintf((char *)params_buf + 8, 256, "%s", loaderparams.kernel_cmdline);
140    }
141
142    rom_add_blob_fixed("params", params_buf, params_size,
143                       (16 << 20) - 264);
144
145    return entry;
146}
147
148static void main_cpu_reset(void *opaque)
149{
150    ResetData *s = (ResetData *)opaque;
151    CPUState *env = s->env;
152
153    cpu_reset(env);
154    env->active_tc.PC = s->vector;
155}
156
157static const int sector_len = 32 * 1024;
158static
159void mips_r4k_init (ram_addr_t ram_size,
160                    const char *boot_device,
161                    const char *kernel_filename, const char *kernel_cmdline,
162                    const char *initrd_filename, const char *cpu_model)
163{
164    char *filename;
165    ram_addr_t ram_offset;
166    ram_addr_t bios_offset;
167    int bios_size;
168    CPUState *env;
169    ResetData *reset_info;
170    RTCState *rtc_state;
171    int i;
172    qemu_irq *i8259;
173    DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
174    DriveInfo *dinfo;
175
176    /* init CPUs */
177    if (cpu_model == NULL) {
178#ifdef TARGET_MIPS64
179        cpu_model = "R4000";
180#else
181        cpu_model = "24Kf";
182#endif
183    }
184    env = cpu_init(cpu_model);
185    if (!env) {
186        fprintf(stderr, "Unable to find CPU definition\n");
187        exit(1);
188    }
189    reset_info = qemu_mallocz(sizeof(ResetData));
190    reset_info->env = env;
191    reset_info->vector = env->active_tc.PC;
192    qemu_register_reset(main_cpu_reset, reset_info);
193
194    /* allocate RAM */
195    if (ram_size > (256 << 20)) {
196        fprintf(stderr,
197                "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
198                ((unsigned int)ram_size / (1 << 20)));
199        exit(1);
200    }
201    ram_offset = qemu_ram_alloc(ram_size);
202
203    cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
204
205    if (!mips_qemu_iomemtype) {
206        mips_qemu_iomemtype = cpu_register_io_memory(mips_qemu_read,
207                                                     mips_qemu_write, NULL);
208    }
209    cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
210
211    /* Try to load a BIOS image. If this fails, we continue regardless,
212       but initialize the hardware ourselves. When a kernel gets
213       preloaded we also initialize the hardware, since the BIOS wasn't
214       run. */
215    if (bios_name == NULL)
216        bios_name = BIOS_FILENAME;
217    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
218    if (filename) {
219        bios_size = get_image_size(filename);
220    } else {
221        bios_size = -1;
222    }
223    if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
224        bios_offset = qemu_ram_alloc(BIOS_SIZE);
225	cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,
226                                     bios_offset | IO_MEM_ROM);
227
228        load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
229    } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
230        uint32_t mips_rom = 0x00400000;
231        bios_offset = qemu_ram_alloc(mips_rom);
232        if (!pflash_cfi01_register(0x1fc00000, bios_offset,
233            dinfo->bdrv, sector_len, mips_rom / sector_len,
234            4, 0, 0, 0, 0)) {
235            fprintf(stderr, "qemu: Error registering flash memory.\n");
236	}
237    }
238    else {
239	/* not fatal */
240        fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
241		bios_name);
242    }
243    if (filename) {
244        qemu_free(filename);
245    }
246
247    if (kernel_filename) {
248        loaderparams.ram_size = ram_size;
249        loaderparams.kernel_filename = kernel_filename;
250        loaderparams.kernel_cmdline = kernel_cmdline;
251        loaderparams.initrd_filename = initrd_filename;
252        reset_info->vector = load_kernel();
253    }
254
255    /* Init CPU internal devices */
256    cpu_mips_irq_init_cpu(env);
257    cpu_mips_clock_init(env);
258
259    /* The PIC is attached to the MIPS CPU INT0 pin */
260    i8259 = i8259_init(env->irq[2]);
261    isa_bus_new(NULL);
262    isa_bus_irqs(i8259);
263
264    rtc_state = rtc_init(2000);
265
266    /* Register 64 KB of ISA IO space at 0x14000000 */
267    isa_mmio_init(0x14000000, 0x00010000);
268    isa_mem_base = 0x10000000;
269
270    pit = pit_init(0x40, i8259[0]);
271
272    for(i = 0; i < MAX_SERIAL_PORTS; i++) {
273        if (serial_hds[i]) {
274            serial_isa_init(i, serial_hds[i]);
275        }
276    }
277
278    isa_vga_init();
279
280    if (nd_table[0].vlan)
281        isa_ne2000_init(0x300, 9, &nd_table[0]);
282
283    if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
284        fprintf(stderr, "qemu: too many IDE bus\n");
285        exit(1);
286    }
287
288    for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
289        hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
290    }
291
292    for(i = 0; i < MAX_IDE_BUS; i++)
293        isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
294                     hd[MAX_IDE_DEVS * i],
295		     hd[MAX_IDE_DEVS * i + 1]);
296
297    isa_create_simple("i8042");
298}
299
300static QEMUMachine mips_machine = {
301    .name = "mips",
302    .desc = "mips r4k platform",
303    .init = mips_r4k_init,
304};
305
306static void mips_machine_init(void)
307{
308    qemu_register_machine(&mips_machine);
309}
310
311machine_init(mips_machine_init);
312