2 * QEMU PC System Emulator
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
42 #include <sys/ioctl.h>
43 #include <sys/socket.h>
45 #include <linux/if_tun.h>
53 #define DEBUG_LOGFILE "/tmp/vl.log"
54 #define DEFAULT_NETWORK_SCRIPT "/etc/vl-ifup"
56 //#define DEBUG_UNUSED_IOPORT
57 //#define DEBUG_IRQ_LATENCY
59 #define PHYS_RAM_BASE 0xa8000000
60 #define KERNEL_LOAD_ADDR 0x00100000
61 #define INITRD_LOAD_ADDR 0x00400000
62 #define KERNEL_PARAMS_ADDR 0x00090000
64 /* from plex86 (BSD license) */
65 struct __attribute__ ((packed)) linux_params {
66 // For 0x00..0x3f, see 'struct screen_info' in linux/include/linux/tty.h.
67 // I just padded out the VESA parts, rather than define them.
69 /* 0x000 */ uint8_t orig_x;
70 /* 0x001 */ uint8_t orig_y;
71 /* 0x002 */ uint16_t ext_mem_k;
72 /* 0x004 */ uint16_t orig_video_page;
73 /* 0x006 */ uint8_t orig_video_mode;
74 /* 0x007 */ uint8_t orig_video_cols;
75 /* 0x008 */ uint16_t unused1;
76 /* 0x00a */ uint16_t orig_video_ega_bx;
77 /* 0x00c */ uint16_t unused2;
78 /* 0x00e */ uint8_t orig_video_lines;
79 /* 0x00f */ uint8_t orig_video_isVGA;
80 /* 0x010 */ uint16_t orig_video_points;
81 /* 0x012 */ uint8_t pad0[0x20 - 0x12]; // VESA info.
82 /* 0x020 */ uint16_t cl_magic; // Commandline magic number (0xA33F)
83 /* 0x022 */ uint16_t cl_offset; // Commandline offset. Address of commandline
84 // is calculated as 0x90000 + cl_offset, bu
85 // only if cl_magic == 0xA33F.
86 /* 0x024 */ uint8_t pad1[0x40 - 0x24]; // VESA info.
88 /* 0x040 */ uint8_t apm_bios_info[20]; // struct apm_bios_info
89 /* 0x054 */ uint8_t pad2[0x80 - 0x54];
91 // Following 2 from 'struct drive_info_struct' in drivers/block/cciss.h.
92 // Might be truncated?
93 /* 0x080 */ uint8_t hd0_info[16]; // hd0-disk-parameter from intvector 0x41
94 /* 0x090 */ uint8_t hd1_info[16]; // hd1-disk-parameter from intvector 0x46
96 // System description table truncated to 16 bytes
97 // From 'struct sys_desc_table_struct' in linux/arch/i386/kernel/setup.c.
98 /* 0x0a0 */ uint16_t sys_description_len;
99 /* 0x0a2 */ uint8_t sys_description_table[14];
101 // [1] machine submodel id
105 /* 0x0b0 */ uint8_t pad3[0x1e0 - 0xb0];
106 /* 0x1e0 */ uint32_t alt_mem_k;
107 /* 0x1e4 */ uint8_t pad4[4];
108 /* 0x1e8 */ uint8_t e820map_entries;
109 /* 0x1e9 */ uint8_t eddbuf_entries; // EDD_NR
110 /* 0x1ea */ uint8_t pad5[0x1f1 - 0x1ea];
111 /* 0x1f1 */ uint8_t setup_sects; // size of setup.S, number of sectors
112 /* 0x1f2 */ uint16_t mount_root_rdonly; // MOUNT_ROOT_RDONLY (if !=0)
113 /* 0x1f4 */ uint16_t sys_size; // size of compressed kernel-part in the
114 // (b)zImage-file (in 16 byte units, rounded up)
115 /* 0x1f6 */ uint16_t swap_dev; // (unused AFAIK)
116 /* 0x1f8 */ uint16_t ramdisk_flags;
117 /* 0x1fa */ uint16_t vga_mode; // (old one)
118 /* 0x1fc */ uint16_t orig_root_dev; // (high=Major, low=minor)
119 /* 0x1fe */ uint8_t pad6[1];
120 /* 0x1ff */ uint8_t aux_device_info;
121 /* 0x200 */ uint16_t jump_setup; // Jump to start of setup code,
122 // aka "reserved" field.
123 /* 0x202 */ uint8_t setup_signature[4]; // Signature for SETUP-header, ="HdrS"
124 /* 0x206 */ uint16_t header_format_version; // Version number of header format;
125 /* 0x208 */ uint8_t setup_S_temp0[8]; // Used by setup.S for communication with
126 // boot loaders, look there.
127 /* 0x210 */ uint8_t loader_type;
132 // T=2: bootsect-loader
136 /* 0x211 */ uint8_t loadflags;
137 // bit0 = 1: kernel is loaded high (bzImage)
138 // bit7 = 1: Heap and pointer (see below) set by boot
140 /* 0x212 */ uint16_t setup_S_temp1;
141 /* 0x214 */ uint32_t kernel_start;
142 /* 0x218 */ uint32_t initrd_start;
143 /* 0x21c */ uint32_t initrd_size;
144 /* 0x220 */ uint8_t setup_S_temp2[4];
145 /* 0x224 */ uint16_t setup_S_heap_end_pointer;
146 /* 0x226 */ uint8_t pad7[0x2d0 - 0x226];
148 /* 0x2d0 : Int 15, ax=e820 memory map. */
149 // (linux/include/asm-i386/e820.h, 'struct e820entry')
152 #define E820_RESERVED 2
153 #define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
161 /* 0x550 */ uint8_t pad8[0x600 - 0x550];
163 // BIOS Enhanced Disk Drive Services.
164 // (From linux/include/asm-i386/edd.h, 'struct edd_info')
165 // Each 'struct edd_info is 78 bytes, times a max of 6 structs in array.
166 /* 0x600 */ uint8_t eddbuf[0x7d4 - 0x600];
168 /* 0x7d4 */ uint8_t pad9[0x800 - 0x7d4];
169 /* 0x800 */ uint8_t commandline[0x800];
172 uint64_t gdt_table[256];
173 uint64_t idt_table[48];
176 #define KERNEL_CS 0x10
177 #define KERNEL_DS 0x18
179 typedef void (IOPortWriteFunc)(CPUX86State *env, uint32_t address, uint32_t data);
180 typedef uint32_t (IOPortReadFunc)(CPUX86State *env, uint32_t address);
182 #define MAX_IOPORTS 4096
184 char phys_ram_file[1024];
185 CPUX86State *global_env;
186 CPUX86State *cpu_single_env;
187 FILE *logfile = NULL;
189 IOPortReadFunc *ioport_read_table[3][MAX_IOPORTS];
190 IOPortWriteFunc *ioport_write_table[3][MAX_IOPORTS];
192 /***********************************************************/
195 uint32_t default_ioport_readb(CPUX86State *env, uint32_t address)
197 #ifdef DEBUG_UNUSED_IOPORT
198 fprintf(stderr, "inb: port=0x%04x\n", address);
203 void default_ioport_writeb(CPUX86State *env, uint32_t address, uint32_t data)
205 #ifdef DEBUG_UNUSED_IOPORT
206 fprintf(stderr, "outb: port=0x%04x data=0x%02x\n", address, data);
210 /* default is to make two byte accesses */
211 uint32_t default_ioport_readw(CPUX86State *env, uint32_t address)
214 data = ioport_read_table[0][address](env, address);
215 data |= ioport_read_table[0][address + 1](env, address + 1) << 8;
219 void default_ioport_writew(CPUX86State *env, uint32_t address, uint32_t data)
221 ioport_write_table[0][address](env, address, data & 0xff);
222 ioport_write_table[0][address + 1](env, address + 1, (data >> 8) & 0xff);
225 uint32_t default_ioport_readl(CPUX86State *env, uint32_t address)
227 #ifdef DEBUG_UNUSED_IOPORT
228 fprintf(stderr, "inl: port=0x%04x\n", address);
233 void default_ioport_writel(CPUX86State *env, uint32_t address, uint32_t data)
235 #ifdef DEBUG_UNUSED_IOPORT
236 fprintf(stderr, "outl: port=0x%04x data=0x%02x\n", address, data);
240 void init_ioports(void)
244 for(i = 0; i < MAX_IOPORTS; i++) {
245 ioport_read_table[0][i] = default_ioport_readb;
246 ioport_write_table[0][i] = default_ioport_writeb;
247 ioport_read_table[1][i] = default_ioport_readw;
248 ioport_write_table[1][i] = default_ioport_writew;
249 ioport_read_table[2][i] = default_ioport_readl;
250 ioport_write_table[2][i] = default_ioport_writel;
254 /* size is the word size in byte */
255 int register_ioport_read(int start, int length, IOPortReadFunc *func, int size)
267 for(i = start; i < start + length; i += size)
268 ioport_read_table[bsize][i] = func;
272 /* size is the word size in byte */
273 int register_ioport_write(int start, int length, IOPortWriteFunc *func, int size)
285 for(i = start; i < start + length; i += size)
286 ioport_write_table[bsize][i] = func;
290 void pstrcpy(char *buf, int buf_size, const char *str)
300 if (c == 0 || q >= buf + buf_size - 1)
307 /* strcat and truncate. */
308 char *pstrcat(char *buf, int buf_size, const char *s)
313 pstrcpy(buf + len, buf_size - len, s);
317 int load_kernel(const char *filename, uint8_t *addr)
319 int fd, size, setup_sects;
320 uint8_t bootsect[512];
322 fd = open(filename, O_RDONLY);
325 if (read(fd, bootsect, 512) != 512)
327 setup_sects = bootsect[0x1F1];
330 /* skip 16 bit setup code */
331 lseek(fd, (setup_sects + 1) * 512, SEEK_SET);
332 size = read(fd, addr, 16 * 1024 * 1024);
342 /* return the size or -1 if error */
343 int load_image(const char *filename, uint8_t *addr)
346 fd = open(filename, O_RDONLY);
349 size = lseek(fd, 0, SEEK_END);
350 lseek(fd, 0, SEEK_SET);
351 if (read(fd, addr, size) != size) {
359 void cpu_x86_outb(CPUX86State *env, int addr, int val)
361 ioport_write_table[0][addr & (MAX_IOPORTS - 1)](env, addr, val);
364 void cpu_x86_outw(CPUX86State *env, int addr, int val)
366 ioport_write_table[1][addr & (MAX_IOPORTS - 1)](env, addr, val);
369 void cpu_x86_outl(CPUX86State *env, int addr, int val)
371 ioport_write_table[2][addr & (MAX_IOPORTS - 1)](env, addr, val);
374 int cpu_x86_inb(CPUX86State *env, int addr)
376 return ioport_read_table[0][addr & (MAX_IOPORTS - 1)](env, addr);
379 int cpu_x86_inw(CPUX86State *env, int addr)
381 return ioport_read_table[1][addr & (MAX_IOPORTS - 1)](env, addr);
384 int cpu_x86_inl(CPUX86State *env, int addr)
386 return ioport_read_table[2][addr & (MAX_IOPORTS - 1)](env, addr);
389 /***********************************************************/
390 void ioport80_write(CPUX86State *env, uint32_t addr, uint32_t data)
394 void hw_error(const char *fmt, ...)
399 fprintf(stderr, "qemu: hardware error: ");
400 vfprintf(stderr, fmt, ap);
401 fprintf(stderr, "\n");
403 cpu_x86_dump_state(global_env, stderr, X86_DUMP_FPU | X86_DUMP_CCOP);
409 /***********************************************************/
411 static uint8_t vga_index;
412 static uint8_t vga_regs[256];
413 static int last_cursor_pos;
415 void update_console_messages(void)
417 int c, i, cursor_pos, eol;
419 cursor_pos = vga_regs[0x0f] | (vga_regs[0x0e] << 8);
421 for(i = last_cursor_pos; i < cursor_pos; i++) {
422 c = phys_ram_base[0xb8000 + (i) * 2];
433 last_cursor_pos = cursor_pos;
436 /* just to see first Linux console messages, we intercept cursor position */
437 void vga_ioport_write(CPUX86State *env, uint32_t addr, uint32_t data)
444 vga_regs[vga_index] = data;
445 if (vga_index == 0x0f)
446 update_console_messages();
452 /***********************************************************/
455 #define RTC_SECONDS 0
456 #define RTC_SECONDS_ALARM 1
457 #define RTC_MINUTES 2
458 #define RTC_MINUTES_ALARM 3
460 #define RTC_HOURS_ALARM 5
461 #define RTC_ALARM_DONT_CARE 0xC0
463 #define RTC_DAY_OF_WEEK 6
464 #define RTC_DAY_OF_MONTH 7
473 /* PC cmos mappings */
474 #define REG_EQUIPMENT_BYTE 0x14
476 uint8_t cmos_data[128];
479 void cmos_ioport_write(CPUX86State *env, uint32_t addr, uint32_t data)
482 cmos_index = data & 0x7f;
486 uint32_t cmos_ioport_read(CPUX86State *env, uint32_t addr)
493 /* toggle update-in-progress bit for Linux (same hack as
495 ret = cmos_data[cmos_index];
496 if (cmos_index == RTC_REG_A)
497 cmos_data[RTC_REG_A] ^= 0x80;
498 else if (cmos_index == RTC_REG_C)
499 cmos_data[RTC_REG_C] = 0x00;
505 static inline int to_bcd(int a)
507 return ((a / 10) << 4) | (a % 10);
517 cmos_data[RTC_SECONDS] = to_bcd(tm->tm_sec);
518 cmos_data[RTC_MINUTES] = to_bcd(tm->tm_min);
519 cmos_data[RTC_HOURS] = to_bcd(tm->tm_hour);
520 cmos_data[RTC_DAY_OF_WEEK] = to_bcd(tm->tm_wday);
521 cmos_data[RTC_DAY_OF_MONTH] = to_bcd(tm->tm_mday);
522 cmos_data[RTC_MONTH] = to_bcd(tm->tm_mon);
523 cmos_data[RTC_YEAR] = to_bcd(tm->tm_year % 100);
525 cmos_data[RTC_REG_A] = 0x26;
526 cmos_data[RTC_REG_B] = 0x02;
527 cmos_data[RTC_REG_C] = 0x00;
528 cmos_data[RTC_REG_D] = 0x80;
530 cmos_data[REG_EQUIPMENT_BYTE] = 0x02; /* FPU is there */
532 register_ioport_write(0x70, 2, cmos_ioport_write, 1);
533 register_ioport_read(0x70, 2, cmos_ioport_read, 1);
536 /***********************************************************/
537 /* 8259 pic emulation */
539 typedef struct PicState {
540 uint8_t last_irr; /* edge detection */
541 uint8_t irr; /* interrupt request register */
542 uint8_t imr; /* interrupt mask register */
543 uint8_t isr; /* interrupt service register */
544 uint8_t priority_add; /* used to compute irq priority */
546 uint8_t read_reg_select;
547 uint8_t special_mask;
550 uint8_t rotate_on_autoeoi;
551 uint8_t init4; /* true if 4 byte init */
554 /* 0 is master pic, 1 is slave pic */
556 int pic_irq_requested;
558 /* set irq level. If an edge is detected, then the IRR is set to 1 */
559 static inline void pic_set_irq1(PicState *s, int irq, int level)
564 if ((s->last_irr & mask) == 0)
568 s->last_irr &= ~mask;
572 static inline int get_priority(PicState *s, int mask)
578 while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
583 /* return the pic wanted interrupt. return -1 if none */
584 static int pic_get_irq(PicState *s)
586 int mask, cur_priority, priority;
588 mask = s->irr & ~s->imr;
589 priority = get_priority(s, mask);
592 /* compute current priority */
593 cur_priority = get_priority(s, s->isr);
594 if (priority > cur_priority) {
595 /* higher priority found: an irq should be generated */
602 /* raise irq to CPU if necessary. must be called every time the active
604 static void pic_update_irq(void)
608 /* first look at slave pic */
609 irq2 = pic_get_irq(&pics[1]);
611 /* if irq request by slave pic, signal master PIC */
612 pic_set_irq1(&pics[0], 2, 1);
613 pic_set_irq1(&pics[0], 2, 0);
615 /* look at requested irq */
616 irq = pic_get_irq(&pics[0]);
620 pic_irq_requested = 8 + irq2;
622 /* from master pic */
623 pic_irq_requested = irq;
625 cpu_x86_interrupt(global_env, CPU_INTERRUPT_HARD);
629 #ifdef DEBUG_IRQ_LATENCY
630 int64_t irq_time[16];
631 int64_t cpu_get_ticks(void);
634 void pic_set_irq(int irq, int level)
636 #ifdef DEBUG_IRQ_LATENCY
638 irq_time[irq] = cpu_get_ticks();
641 pic_set_irq1(&pics[irq >> 3], irq & 7, level);
645 int cpu_x86_get_pic_interrupt(CPUX86State *env)
647 int irq, irq2, intno;
649 /* signal the pic that the irq was acked by the CPU */
650 irq = pic_irq_requested;
651 #ifdef DEBUG_IRQ_LATENCY
652 printf("IRQ%d latency=%Ld\n", irq, cpu_get_ticks() - irq_time[irq]);
657 pics[1].isr |= (1 << irq2);
658 pics[1].irr &= ~(1 << irq2);
660 intno = pics[1].irq_base + irq2;
662 intno = pics[0].irq_base + irq;
664 pics[0].isr |= (1 << irq);
665 pics[0].irr &= ~(1 << irq);
669 void pic_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
674 s = &pics[addr >> 7];
679 memset(s, 0, sizeof(PicState));
683 hw_error("single mode not supported");
685 hw_error("level sensitive irq not supported");
686 } else if (val & 0x08) {
688 s->read_reg_select = val & 1;
690 s->special_mask = (val >> 5) & 1;
695 s->rotate_on_autoeoi = val >> 7;
697 case 0x20: /* end of interrupt */
699 priority = get_priority(s, s->isr);
701 s->isr &= ~(1 << ((priority + s->priority_add) & 7));
704 s->priority_add = (s->priority_add + 1) & 7;
708 s->isr &= ~(1 << priority);
711 s->priority_add = (val + 1) & 7;
715 s->isr &= ~(1 << priority);
716 s->priority_add = (priority + 1) & 7;
721 switch(s->init_state) {
728 s->irq_base = val & 0xf8;
739 s->auto_eoi = (val >> 1) & 1;
746 uint32_t pic_ioport_read(CPUX86State *env, uint32_t addr)
749 s = &pics[addr >> 7];
752 if (s->read_reg_select)
763 register_ioport_write(0x20, 2, pic_ioport_write, 1);
764 register_ioport_read(0x20, 2, pic_ioport_read, 1);
765 register_ioport_write(0xa0, 2, pic_ioport_write, 1);
766 register_ioport_read(0xa0, 2, pic_ioport_read, 1);
769 /***********************************************************/
770 /* 8253 PIT emulation */
772 #define PIT_FREQ 1193182
774 #define RW_STATE_LSB 0
775 #define RW_STATE_MSB 1
776 #define RW_STATE_WORD0 2
777 #define RW_STATE_WORD1 3
778 #define RW_STATE_LATCHED_WORD0 4
779 #define RW_STATE_LATCHED_WORD1 5
781 typedef struct PITChannelState {
782 int count; /* can be 65536 */
783 uint16_t latched_count;
786 uint8_t bcd; /* not supported */
787 uint8_t gate; /* timer start */
788 int64_t count_load_time;
789 int64_t count_last_edge_check_time;
792 PITChannelState pit_channels[3];
794 int pit_min_timer_count = 0;
796 int64_t ticks_per_sec;
798 int64_t get_clock(void)
801 gettimeofday(&tv, NULL);
802 return tv.tv_sec * 1000000LL + tv.tv_usec;
805 int64_t cpu_get_ticks(void)
808 asm("rdtsc" : "=A" (val));
812 void cpu_calibrate_ticks(void)
817 ticks = cpu_get_ticks();
819 usec = get_clock() - usec;
820 ticks = cpu_get_ticks() - ticks;
821 ticks_per_sec = (ticks * 1000000LL + (usec >> 1)) / usec;
824 /* compute with 96 bit intermediate result: (a*b)/c */
825 static uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
830 #ifdef WORDS_BIGENDIAN
840 rl = (uint64_t)u.l.low * (uint64_t)b;
841 rh = (uint64_t)u.l.high * (uint64_t)b;
844 res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
848 static int pit_get_count(PITChannelState *s)
853 d = muldiv64(cpu_get_ticks() - s->count_load_time, PIT_FREQ, ticks_per_sec);
859 counter = (s->count - d) & 0xffff;
862 counter = s->count - (d % s->count);
868 /* get pit output bit */
869 static int pit_get_out(PITChannelState *s)
874 d = muldiv64(cpu_get_ticks() - s->count_load_time, PIT_FREQ, ticks_per_sec);
878 out = (d >= s->count);
881 out = (d < s->count);
884 if ((d % s->count) == 0 && d != 0)
890 out = (d % s->count) < (s->count >> 1);
894 out = (d == s->count);
900 /* get the number of 0 to 1 transitions we had since we call this
902 /* XXX: maybe better to use ticks precision to avoid getting edges
903 twice if checks are done at very small intervals */
904 static int pit_get_out_edges(PITChannelState *s)
910 ticks = cpu_get_ticks();
911 d1 = muldiv64(s->count_last_edge_check_time - s->count_load_time,
912 PIT_FREQ, ticks_per_sec);
913 d2 = muldiv64(ticks - s->count_load_time,
914 PIT_FREQ, ticks_per_sec);
915 s->count_last_edge_check_time = ticks;
919 if (d1 < s->count && d2 >= s->count)
933 v = s->count - (s->count >> 1);
934 d1 = (d1 + v) / s->count;
935 d2 = (d2 + v) / s->count;
940 if (d1 < s->count && d2 >= s->count)
949 static inline void pit_load_count(PITChannelState *s, int val)
953 s->count_load_time = cpu_get_ticks();
954 s->count_last_edge_check_time = s->count_load_time;
956 if (s == &pit_channels[0] && val <= pit_min_timer_count) {
958 "\nWARNING: vl: on your system, accurate timer emulation is impossible if its frequency is more than %d Hz. If using a 2.5.xx Linux kernel, you must patch asm/param.h to change HZ from 1000 to 100.\n\n",
959 PIT_FREQ / pit_min_timer_count);
963 void pit_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
973 s = &pit_channels[channel];
974 access = (val >> 4) & 3;
977 s->latched_count = pit_get_count(s);
978 s->rw_state = RW_STATE_LATCHED_WORD0;
981 s->mode = (val >> 1) & 7;
983 s->rw_state = access - 1 + RW_STATE_LSB;
987 s = &pit_channels[addr];
988 switch(s->rw_state) {
990 pit_load_count(s, val);
993 pit_load_count(s, val << 8);
997 if (s->rw_state & 1) {
998 pit_load_count(s, (s->latched_count & 0xff) | (val << 8));
1000 s->latched_count = val;
1008 uint32_t pit_ioport_read(CPUX86State *env, uint32_t addr)
1014 s = &pit_channels[addr];
1015 switch(s->rw_state) {
1018 case RW_STATE_WORD0:
1019 case RW_STATE_WORD1:
1020 count = pit_get_count(s);
1021 if (s->rw_state & 1)
1022 ret = (count >> 8) & 0xff;
1025 if (s->rw_state & 2)
1029 case RW_STATE_LATCHED_WORD0:
1030 case RW_STATE_LATCHED_WORD1:
1031 if (s->rw_state & 1)
1032 ret = s->latched_count >> 8;
1034 ret = s->latched_count & 0xff;
1041 void speaker_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
1043 speaker_data_on = (val >> 1) & 1;
1044 pit_channels[2].gate = val & 1;
1047 uint32_t speaker_ioport_read(CPUX86State *env, uint32_t addr)
1050 out = pit_get_out(&pit_channels[2]);
1051 return (speaker_data_on << 1) | pit_channels[2].gate | (out << 5);
1059 cpu_calibrate_ticks();
1061 for(i = 0;i < 3; i++) {
1062 s = &pit_channels[i];
1065 pit_load_count(s, 0);
1068 register_ioport_write(0x40, 4, pit_ioport_write, 1);
1069 register_ioport_read(0x40, 3, pit_ioport_read, 1);
1071 register_ioport_read(0x61, 1, speaker_ioport_read, 1);
1072 register_ioport_write(0x61, 1, speaker_ioport_write, 1);
1075 /***********************************************************/
1076 /* serial port emulation */
1080 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
1082 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
1083 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
1084 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
1085 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
1087 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */
1088 #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
1090 #define UART_IIR_MSI 0x00 /* Modem status interrupt */
1091 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
1092 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */
1093 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
1095 #define UART_LSR_TEMT 0x40 /* Transmitter empty */
1096 #define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
1097 #define UART_LSR_BI 0x10 /* Break interrupt indicator */
1098 #define UART_LSR_FE 0x08 /* Frame error indicator */
1099 #define UART_LSR_PE 0x04 /* Parity error indicator */
1100 #define UART_LSR_OE 0x02 /* Overrun error indicator */
1101 #define UART_LSR_DR 0x01 /* Receiver data ready */
1103 typedef struct SerialState {
1105 uint8_t rbr; /* receive register */
1107 uint8_t iir; /* read only */
1110 uint8_t lsr; /* read only */
1115 SerialState serial_ports[1];
1117 void serial_update_irq(void)
1119 SerialState *s = &serial_ports[0];
1121 if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) {
1122 s->iir = UART_IIR_RDI;
1123 } else if ((s->lsr & UART_LSR_THRE) && (s->ier & UART_IER_THRI)) {
1124 s->iir = UART_IIR_THRI;
1126 s->iir = UART_IIR_NO_INT;
1128 if (s->iir != UART_IIR_NO_INT) {
1129 pic_set_irq(UART_IRQ, 1);
1131 pic_set_irq(UART_IRQ, 0);
1135 void serial_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
1137 SerialState *s = &serial_ports[0];
1145 if (s->lcr & UART_LCR_DLAB) {
1146 s->divider = (s->divider & 0xff00) | val;
1148 s->lsr &= ~UART_LSR_THRE;
1149 serial_update_irq();
1153 ret = write(1, &ch, 1);
1155 s->lsr |= UART_LSR_THRE;
1156 s->lsr |= UART_LSR_TEMT;
1157 serial_update_irq();
1161 if (s->lcr & UART_LCR_DLAB) {
1162 s->divider = (s->divider & 0x00ff) | (val << 8);
1165 serial_update_irq();
1187 uint32_t serial_ioport_read(CPUX86State *env, uint32_t addr)
1189 SerialState *s = &serial_ports[0];
1196 if (s->lcr & UART_LCR_DLAB) {
1197 ret = s->divider & 0xff;
1200 s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
1201 serial_update_irq();
1205 if (s->lcr & UART_LCR_DLAB) {
1206 ret = (s->divider >> 8) & 0xff;
1233 #define TERM_ESCAPE 0x01 /* ctrl-a is used for escape */
1234 static int term_got_escape;
1236 void term_print_help(void)
1239 "C-a h print this help\n"
1240 "C-a x exit emulatior\n"
1241 "C-a b send break (magic sysrq)\n"
1242 "C-a C-a send C-a\n"
1246 /* called when a char is received */
1247 void serial_received_byte(SerialState *s, int ch)
1249 if (term_got_escape) {
1250 term_got_escape = 0;
1261 s->lsr |= UART_LSR_BI | UART_LSR_DR;
1262 serial_update_irq();
1267 } else if (ch == TERM_ESCAPE) {
1268 term_got_escape = 1;
1272 s->lsr |= UART_LSR_DR;
1273 serial_update_irq();
1277 /* init terminal so that we can grab keys */
1278 static struct termios oldtty;
1280 static void term_exit(void)
1282 tcsetattr (0, TCSANOW, &oldtty);
1285 static void term_init(void)
1289 tcgetattr (0, &tty);
1292 tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
1293 |INLCR|IGNCR|ICRNL|IXON);
1294 tty.c_oflag |= OPOST;
1295 tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN|ISIG);
1296 tty.c_cflag &= ~(CSIZE|PARENB);
1299 tty.c_cc[VTIME] = 0;
1301 tcsetattr (0, TCSANOW, &tty);
1305 fcntl(0, F_SETFL, O_NONBLOCK);
1308 void serial_init(void)
1310 SerialState *s = &serial_ports[0];
1312 s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
1314 register_ioport_write(0x3f8, 8, serial_ioport_write, 1);
1315 register_ioport_read(0x3f8, 8, serial_ioport_read, 1);
1320 /***********************************************************/
1321 /* ne2000 emulation */
1323 //#define DEBUG_NE2000
1325 #define NE2000_IOPORT 0x300
1326 #define NE2000_IRQ 9
1328 #define MAX_ETH_FRAME_SIZE 1514
1330 #define E8390_CMD 0x00 /* The command register (for all pages) */
1331 /* Page 0 register offsets. */
1332 #define EN0_CLDALO 0x01 /* Low byte of current local dma addr RD */
1333 #define EN0_STARTPG 0x01 /* Starting page of ring bfr WR */
1334 #define EN0_CLDAHI 0x02 /* High byte of current local dma addr RD */
1335 #define EN0_STOPPG 0x02 /* Ending page +1 of ring bfr WR */
1336 #define EN0_BOUNDARY 0x03 /* Boundary page of ring bfr RD WR */
1337 #define EN0_TSR 0x04 /* Transmit status reg RD */
1338 #define EN0_TPSR 0x04 /* Transmit starting page WR */
1339 #define EN0_NCR 0x05 /* Number of collision reg RD */
1340 #define EN0_TCNTLO 0x05 /* Low byte of tx byte count WR */
1341 #define EN0_FIFO 0x06 /* FIFO RD */
1342 #define EN0_TCNTHI 0x06 /* High byte of tx byte count WR */
1343 #define EN0_ISR 0x07 /* Interrupt status reg RD WR */
1344 #define EN0_CRDALO 0x08 /* low byte of current remote dma address RD */
1345 #define EN0_RSARLO 0x08 /* Remote start address reg 0 */
1346 #define EN0_CRDAHI 0x09 /* high byte, current remote dma address RD */
1347 #define EN0_RSARHI 0x09 /* Remote start address reg 1 */
1348 #define EN0_RCNTLO 0x0a /* Remote byte count reg WR */
1349 #define EN0_RCNTHI 0x0b /* Remote byte count reg WR */
1350 #define EN0_RSR 0x0c /* rx status reg RD */
1351 #define EN0_RXCR 0x0c /* RX configuration reg WR */
1352 #define EN0_TXCR 0x0d /* TX configuration reg WR */
1353 #define EN0_COUNTER0 0x0d /* Rcv alignment error counter RD */
1354 #define EN0_DCFG 0x0e /* Data configuration reg WR */
1355 #define EN0_COUNTER1 0x0e /* Rcv CRC error counter RD */
1356 #define EN0_IMR 0x0f /* Interrupt mask reg WR */
1357 #define EN0_COUNTER2 0x0f /* Rcv missed frame error counter RD */
1359 #define EN1_PHYS 0x11
1360 #define EN1_CURPAG 0x17
1361 #define EN1_MULT 0x18
1363 /* Register accessed at EN_CMD, the 8390 base addr. */
1364 #define E8390_STOP 0x01 /* Stop and reset the chip */
1365 #define E8390_START 0x02 /* Start the chip, clear reset */
1366 #define E8390_TRANS 0x04 /* Transmit a frame */
1367 #define E8390_RREAD 0x08 /* Remote read */
1368 #define E8390_RWRITE 0x10 /* Remote write */
1369 #define E8390_NODMA 0x20 /* Remote DMA */
1370 #define E8390_PAGE0 0x00 /* Select page chip registers */
1371 #define E8390_PAGE1 0x40 /* using the two high-order bits */
1372 #define E8390_PAGE2 0x80 /* Page 3 is invalid. */
1374 /* Bits in EN0_ISR - Interrupt status register */
1375 #define ENISR_RX 0x01 /* Receiver, no error */
1376 #define ENISR_TX 0x02 /* Transmitter, no error */
1377 #define ENISR_RX_ERR 0x04 /* Receiver, with error */
1378 #define ENISR_TX_ERR 0x08 /* Transmitter, with error */
1379 #define ENISR_OVER 0x10 /* Receiver overwrote the ring */
1380 #define ENISR_COUNTERS 0x20 /* Counters need emptying */
1381 #define ENISR_RDC 0x40 /* remote dma complete */
1382 #define ENISR_RESET 0x80 /* Reset completed */
1383 #define ENISR_ALL 0x3f /* Interrupts we will enable */
1385 /* Bits in received packet status byte and EN0_RSR*/
1386 #define ENRSR_RXOK 0x01 /* Received a good packet */
1387 #define ENRSR_CRC 0x02 /* CRC error */
1388 #define ENRSR_FAE 0x04 /* frame alignment error */
1389 #define ENRSR_FO 0x08 /* FIFO overrun */
1390 #define ENRSR_MPA 0x10 /* missed pkt */
1391 #define ENRSR_PHY 0x20 /* physical/multicast address */
1392 #define ENRSR_DIS 0x40 /* receiver disable. set in monitor mode */
1393 #define ENRSR_DEF 0x80 /* deferring */
1395 /* Transmitted packet status, EN0_TSR. */
1396 #define ENTSR_PTX 0x01 /* Packet transmitted without error */
1397 #define ENTSR_ND 0x02 /* The transmit wasn't deferred. */
1398 #define ENTSR_COL 0x04 /* The transmit collided at least once. */
1399 #define ENTSR_ABT 0x08 /* The transmit collided 16 times, and was deferred. */
1400 #define ENTSR_CRS 0x10 /* The carrier sense was lost. */
1401 #define ENTSR_FU 0x20 /* A "FIFO underrun" occurred during transmit. */
1402 #define ENTSR_CDH 0x40 /* The collision detect "heartbeat" signal was lost. */
1403 #define ENTSR_OWC 0x80 /* There was an out-of-window collision. */
1405 #define NE2000_MEM_SIZE 32768
1407 typedef struct NE2000State {
1420 uint8_t phys[6]; /* mac address */
1422 uint8_t mult[8]; /* multicast mask array */
1423 uint8_t mem[NE2000_MEM_SIZE];
1426 NE2000State ne2000_state;
1428 char network_script[1024];
1430 void ne2000_reset(void)
1432 NE2000State *s = &ne2000_state;
1435 s->isr = ENISR_RESET;
1445 /* duplicate prom data */
1446 for(i = 15;i >= 0; i--) {
1447 s->mem[2 * i] = s->mem[i];
1448 s->mem[2 * i + 1] = s->mem[i];
1452 void ne2000_update_irq(NE2000State *s)
1455 isr = s->isr & s->imr;
1457 pic_set_irq(NE2000_IRQ, 1);
1459 pic_set_irq(NE2000_IRQ, 0);
1465 int fd, ret, pid, status;
1467 fd = open("/dev/net/tun", O_RDWR);
1469 fprintf(stderr, "warning: could not open /dev/net/tun: no virtual network emulation\n");
1472 memset(&ifr, 0, sizeof(ifr));
1473 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
1474 pstrcpy(ifr.ifr_name, IFNAMSIZ, "tun%d");
1475 ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
1477 fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n");
1481 printf("Connected to host network interface: %s\n", ifr.ifr_name);
1482 fcntl(fd, F_SETFL, O_NONBLOCK);
1485 /* try to launch network init script */
1489 execl(network_script, network_script, ifr.ifr_name, NULL);
1492 while (waitpid(pid, &status, 0) != pid);
1493 if (!WIFEXITED(status) ||
1494 WEXITSTATUS(status) != 0) {
1495 fprintf(stderr, "%s: could not launch network script for '%s'\n",
1496 network_script, ifr.ifr_name);
1502 void net_send_packet(NE2000State *s, const uint8_t *buf, int size)
1505 printf("NE2000: sending packet size=%d\n", size);
1507 write(net_fd, buf, size);
1510 /* return true if the NE2000 can receive more data */
1511 int ne2000_can_receive(NE2000State *s)
1513 int avail, index, boundary;
1515 if (s->cmd & E8390_STOP)
1517 index = s->curpag << 8;
1518 boundary = s->boundary << 8;
1519 if (index < boundary)
1520 avail = boundary - index;
1522 avail = (s->stop - s->start) - (index - boundary);
1523 if (avail < (MAX_ETH_FRAME_SIZE + 4))
1528 void ne2000_receive(NE2000State *s, uint8_t *buf, int size)
1531 int total_len, next, avail, len, index;
1533 #if defined(DEBUG_NE2000)
1534 printf("NE2000: received len=%d\n", size);
1537 index = s->curpag << 8;
1538 /* 4 bytes for header */
1539 total_len = size + 4;
1540 /* address for next packet (4 bytes for CRC) */
1541 next = index + ((total_len + 4 + 255) & ~0xff);
1542 if (next >= s->stop)
1543 next -= (s->stop - s->start);
1544 /* prepare packet header */
1546 p[0] = ENRSR_RXOK; /* receive status */
1549 p[3] = total_len >> 8;
1552 /* write packet data */
1554 avail = s->stop - index;
1558 memcpy(s->mem + index, buf, len);
1561 if (index == s->stop)
1565 s->curpag = next >> 8;
1567 /* now we can signal we have receive something */
1569 ne2000_update_irq(s);
1572 void ne2000_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
1574 NE2000State *s = &ne2000_state;
1579 printf("NE2000: write addr=0x%x val=0x%02x\n", addr, val);
1581 if (addr == E8390_CMD) {
1582 /* control register */
1584 if (val & E8390_START) {
1585 /* test specific case: zero length transfert */
1586 if ((val & (E8390_RREAD | E8390_RWRITE)) &&
1588 s->isr |= ENISR_RDC;
1589 ne2000_update_irq(s);
1591 if (val & E8390_TRANS) {
1592 net_send_packet(s, s->mem + (s->tpsr << 8), s->tcnt);
1593 /* signal end of transfert */
1596 ne2000_update_irq(s);
1601 offset = addr | (page << 4);
1604 s->start = val << 8;
1614 ne2000_update_irq(s);
1620 s->tcnt = (s->tcnt & 0xff00) | val;
1623 s->tcnt = (s->tcnt & 0x00ff) | (val << 8);
1626 s->rsar = (s->rsar & 0xff00) | val;
1629 s->rsar = (s->rsar & 0x00ff) | (val << 8);
1632 s->rcnt = (s->rcnt & 0xff00) | val;
1635 s->rcnt = (s->rcnt & 0x00ff) | (val << 8);
1642 ne2000_update_irq(s);
1644 case EN1_PHYS ... EN1_PHYS + 5:
1645 s->phys[offset - EN1_PHYS] = val;
1650 case EN1_MULT ... EN1_MULT + 7:
1651 s->mult[offset - EN1_MULT] = val;
1657 uint32_t ne2000_ioport_read(CPUX86State *env, uint32_t addr)
1659 NE2000State *s = &ne2000_state;
1660 int offset, page, ret;
1663 if (addr == E8390_CMD) {
1667 offset = addr | (page << 4);
1678 case EN1_PHYS ... EN1_PHYS + 5:
1679 ret = s->phys[offset - EN1_PHYS];
1684 case EN1_MULT ... EN1_MULT + 7:
1685 ret = s->mult[offset - EN1_MULT];
1693 printf("NE2000: read addr=0x%x val=%02x\n", addr, ret);
1698 void ne2000_asic_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
1700 NE2000State *s = &ne2000_state;
1704 printf("NE2000: asic write val=0x%04x\n", val);
1706 p = s->mem + s->rsar;
1707 if (s->dcfg & 0x01) {
1720 if (s->rsar == s->stop)
1723 /* signal end of transfert */
1724 s->isr |= ENISR_RDC;
1725 ne2000_update_irq(s);
1729 uint32_t ne2000_asic_ioport_read(CPUX86State *env, uint32_t addr)
1731 NE2000State *s = &ne2000_state;
1735 p = s->mem + s->rsar;
1736 if (s->dcfg & 0x01) {
1738 ret = p[0] | (p[1] << 8);
1748 if (s->rsar == s->stop)
1751 /* signal end of transfert */
1752 s->isr |= ENISR_RDC;
1753 ne2000_update_irq(s);
1756 printf("NE2000: asic read val=0x%04x\n", ret);
1761 void ne2000_reset_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
1763 /* nothing to do (end of reset pulse) */
1766 uint32_t ne2000_reset_ioport_read(CPUX86State *env, uint32_t addr)
1772 void ne2000_init(void)
1774 register_ioport_write(NE2000_IOPORT, 16, ne2000_ioport_write, 1);
1775 register_ioport_read(NE2000_IOPORT, 16, ne2000_ioport_read, 1);
1777 register_ioport_write(NE2000_IOPORT + 0x10, 1, ne2000_asic_ioport_write, 1);
1778 register_ioport_read(NE2000_IOPORT + 0x10, 1, ne2000_asic_ioport_read, 1);
1779 register_ioport_write(NE2000_IOPORT + 0x10, 2, ne2000_asic_ioport_write, 2);
1780 register_ioport_read(NE2000_IOPORT + 0x10, 2, ne2000_asic_ioport_read, 2);
1782 register_ioport_write(NE2000_IOPORT + 0x1f, 1, ne2000_reset_ioport_write, 1);
1783 register_ioport_read(NE2000_IOPORT + 0x1f, 1, ne2000_reset_ioport_read, 1);
1787 /***********************************************************/
1792 /* Bits of HD_STATUS */
1793 #define ERR_STAT 0x01
1794 #define INDEX_STAT 0x02
1795 #define ECC_STAT 0x04 /* Corrected error */
1796 #define DRQ_STAT 0x08
1797 #define SEEK_STAT 0x10
1798 #define SRV_STAT 0x10
1799 #define WRERR_STAT 0x20
1800 #define READY_STAT 0x40
1801 #define BUSY_STAT 0x80
1803 /* Bits for HD_ERROR */
1804 #define MARK_ERR 0x01 /* Bad address mark */
1805 #define TRK0_ERR 0x02 /* couldn't find track 0 */
1806 #define ABRT_ERR 0x04 /* Command aborted */
1807 #define MCR_ERR 0x08 /* media change request */
1808 #define ID_ERR 0x10 /* ID field not found */
1809 #define MC_ERR 0x20 /* media changed */
1810 #define ECC_ERR 0x40 /* Uncorrectable ECC error */
1811 #define BBD_ERR 0x80 /* pre-EIDE meaning: block marked bad */
1812 #define ICRC_ERR 0x80 /* new meaning: CRC error during transfer */
1814 /* Bits of HD_NSECTOR */
1818 #define TAG_MASK 0xf8
1820 #define IDE_CMD_RESET 0x04
1821 #define IDE_CMD_DISABLE_IRQ 0x02
1823 /* ATA/ATAPI Commands pre T13 Spec */
1824 #define WIN_NOP 0x00
1826 * 0x01->0x02 Reserved
1828 #define CFA_REQ_EXT_ERROR_CODE 0x03 /* CFA Request Extended Error Code */
1830 * 0x04->0x07 Reserved
1832 #define WIN_SRST 0x08 /* ATAPI soft reset command */
1833 #define WIN_DEVICE_RESET 0x08
1835 * 0x09->0x0F Reserved
1837 #define WIN_RECAL 0x10
1838 #define WIN_RESTORE WIN_RECAL
1840 * 0x10->0x1F Reserved
1842 #define WIN_READ 0x20 /* 28-Bit */
1843 #define WIN_READ_ONCE 0x21 /* 28-Bit without retries */
1844 #define WIN_READ_LONG 0x22 /* 28-Bit */
1845 #define WIN_READ_LONG_ONCE 0x23 /* 28-Bit without retries */
1846 #define WIN_READ_EXT 0x24 /* 48-Bit */
1847 #define WIN_READDMA_EXT 0x25 /* 48-Bit */
1848 #define WIN_READDMA_QUEUED_EXT 0x26 /* 48-Bit */
1849 #define WIN_READ_NATIVE_MAX_EXT 0x27 /* 48-Bit */
1853 #define WIN_MULTREAD_EXT 0x29 /* 48-Bit */
1855 * 0x2A->0x2F Reserved
1857 #define WIN_WRITE 0x30 /* 28-Bit */
1858 #define WIN_WRITE_ONCE 0x31 /* 28-Bit without retries */
1859 #define WIN_WRITE_LONG 0x32 /* 28-Bit */
1860 #define WIN_WRITE_LONG_ONCE 0x33 /* 28-Bit without retries */
1861 #define WIN_WRITE_EXT 0x34 /* 48-Bit */
1862 #define WIN_WRITEDMA_EXT 0x35 /* 48-Bit */
1863 #define WIN_WRITEDMA_QUEUED_EXT 0x36 /* 48-Bit */
1864 #define WIN_SET_MAX_EXT 0x37 /* 48-Bit */
1865 #define CFA_WRITE_SECT_WO_ERASE 0x38 /* CFA Write Sectors without erase */
1866 #define WIN_MULTWRITE_EXT 0x39 /* 48-Bit */
1868 * 0x3A->0x3B Reserved
1870 #define WIN_WRITE_VERIFY 0x3C /* 28-Bit */
1872 * 0x3D->0x3F Reserved
1874 #define WIN_VERIFY 0x40 /* 28-Bit - Read Verify Sectors */
1875 #define WIN_VERIFY_ONCE 0x41 /* 28-Bit - without retries */
1876 #define WIN_VERIFY_EXT 0x42 /* 48-Bit */
1878 * 0x43->0x4F Reserved
1880 #define WIN_FORMAT 0x50
1882 * 0x51->0x5F Reserved
1884 #define WIN_INIT 0x60
1886 * 0x61->0x5F Reserved
1888 #define WIN_SEEK 0x70 /* 0x70-0x7F Reserved */
1889 #define CFA_TRANSLATE_SECTOR 0x87 /* CFA Translate Sector */
1890 #define WIN_DIAGNOSE 0x90
1891 #define WIN_SPECIFY 0x91 /* set drive geometry translation */
1892 #define WIN_DOWNLOAD_MICROCODE 0x92
1893 #define WIN_STANDBYNOW2 0x94
1894 #define WIN_STANDBY2 0x96
1895 #define WIN_SETIDLE2 0x97
1896 #define WIN_CHECKPOWERMODE2 0x98
1897 #define WIN_SLEEPNOW2 0x99
1901 #define WIN_PACKETCMD 0xA0 /* Send a packet command. */
1902 #define WIN_PIDENTIFY 0xA1 /* identify ATAPI device */
1903 #define WIN_QUEUED_SERVICE 0xA2
1904 #define WIN_SMART 0xB0 /* self-monitoring and reporting */
1905 #define CFA_ERASE_SECTORS 0xC0
1906 #define WIN_MULTREAD 0xC4 /* read sectors using multiple mode*/
1907 #define WIN_MULTWRITE 0xC5 /* write sectors using multiple mode */
1908 #define WIN_SETMULT 0xC6 /* enable/disable multiple mode */
1909 #define WIN_READDMA_QUEUED 0xC7 /* read sectors using Queued DMA transfers */
1910 #define WIN_READDMA 0xC8 /* read sectors using DMA transfers */
1911 #define WIN_READDMA_ONCE 0xC9 /* 28-Bit - without retries */
1912 #define WIN_WRITEDMA 0xCA /* write sectors using DMA transfers */
1913 #define WIN_WRITEDMA_ONCE 0xCB /* 28-Bit - without retries */
1914 #define WIN_WRITEDMA_QUEUED 0xCC /* write sectors using Queued DMA transfers */
1915 #define CFA_WRITE_MULTI_WO_ERASE 0xCD /* CFA Write multiple without erase */
1916 #define WIN_GETMEDIASTATUS 0xDA
1917 #define WIN_ACKMEDIACHANGE 0xDB /* ATA-1, ATA-2 vendor */
1918 #define WIN_POSTBOOT 0xDC
1919 #define WIN_PREBOOT 0xDD
1920 #define WIN_DOORLOCK 0xDE /* lock door on removable drives */
1921 #define WIN_DOORUNLOCK 0xDF /* unlock door on removable drives */
1922 #define WIN_STANDBYNOW1 0xE0
1923 #define WIN_IDLEIMMEDIATE 0xE1 /* force drive to become "ready" */
1924 #define WIN_STANDBY 0xE2 /* Set device in Standby Mode */
1925 #define WIN_SETIDLE1 0xE3
1926 #define WIN_READ_BUFFER 0xE4 /* force read only 1 sector */
1927 #define WIN_CHECKPOWERMODE1 0xE5
1928 #define WIN_SLEEPNOW1 0xE6
1929 #define WIN_FLUSH_CACHE 0xE7
1930 #define WIN_WRITE_BUFFER 0xE8 /* force write only 1 sector */
1931 #define WIN_WRITE_SAME 0xE9 /* read ata-2 to use */
1932 /* SET_FEATURES 0x22 or 0xDD */
1933 #define WIN_FLUSH_CACHE_EXT 0xEA /* 48-Bit */
1934 #define WIN_IDENTIFY 0xEC /* ask drive to identify itself */
1935 #define WIN_MEDIAEJECT 0xED
1936 #define WIN_IDENTIFY_DMA 0xEE /* same as WIN_IDENTIFY, but DMA */
1937 #define WIN_SETFEATURES 0xEF /* set special drive features */
1938 #define EXABYTE_ENABLE_NEST 0xF0
1939 #define WIN_SECURITY_SET_PASS 0xF1
1940 #define WIN_SECURITY_UNLOCK 0xF2
1941 #define WIN_SECURITY_ERASE_PREPARE 0xF3
1942 #define WIN_SECURITY_ERASE_UNIT 0xF4
1943 #define WIN_SECURITY_FREEZE_LOCK 0xF5
1944 #define WIN_SECURITY_DISABLE 0xF6
1945 #define WIN_READ_NATIVE_MAX 0xF8 /* return the native maximum address */
1946 #define WIN_SET_MAX 0xF9
1947 #define DISABLE_SEAGATE 0xFB
1949 /* set to 1 set disable mult support */
1950 #define MAX_MULT_SECTORS 8
1956 typedef void EndTransferFunc(struct IDEState *);
1958 typedef struct IDEState {
1960 int cylinders, heads, sectors;
1967 uint16_t nsector; /* 0 is 256 to ease computations */
1973 /* 0x3f6 command, only meaningful for drive 0 */
1975 /* depends on bit 4 in select, only meaningful for drive 0 */
1976 struct IDEState *cur_drive;
1977 BlockDriverState *bs;
1978 int req_nb_sectors; /* number of sectors per interrupt */
1979 EndTransferFunc *end_transfer_func;
1982 uint8_t io_buffer[MAX_MULT_SECTORS*512 + 4];
1985 BlockDriverState *bs_table[MAX_DISKS];
1986 IDEState ide_state[MAX_DISKS];
1988 static void padstr(char *str, const char *src, int len)
1991 for(i = 0; i < len; i++) {
1996 *(char *)((long)str ^ 1) = v;
2001 static void ide_identify(IDEState *s)
2004 unsigned int oldsize;
2006 memset(s->io_buffer, 0, 512);
2007 p = (uint16_t *)s->io_buffer;
2009 stw(p + 1, s->cylinders);
2010 stw(p + 3, s->heads);
2011 stw(p + 4, 512 * s->sectors); /* sectors */
2012 stw(p + 5, 512); /* sector size */
2013 stw(p + 6, s->sectors);
2014 stw(p + 20, 3); /* buffer type */
2015 stw(p + 21, 512); /* cache size in sectors */
2016 stw(p + 22, 4); /* ecc bytes */
2017 padstr((uint8_t *)(p + 27), "QEMU HARDDISK", 40);
2018 #if MAX_MULT_SECTORS > 1
2019 stw(p + 47, MAX_MULT_SECTORS);
2021 stw(p + 48, 1); /* dword I/O */
2022 stw(p + 49, 1 << 9); /* LBA supported, no DMA */
2023 stw(p + 51, 0x200); /* PIO transfer cycle */
2024 stw(p + 52, 0x200); /* DMA transfer cycle */
2025 stw(p + 54, s->cylinders);
2026 stw(p + 55, s->heads);
2027 stw(p + 56, s->sectors);
2028 oldsize = s->cylinders * s->heads * s->sectors;
2029 stw(p + 57, oldsize);
2030 stw(p + 58, oldsize >> 16);
2031 if (s->mult_sectors)
2032 stw(p + 59, 0x100 | s->mult_sectors);
2033 stw(p + 60, s->nb_sectors);
2034 stw(p + 61, s->nb_sectors >> 16);
2035 stw(p + 80, (1 << 1) | (1 << 2));
2036 stw(p + 82, (1 << 14));
2037 stw(p + 83, (1 << 14));
2038 stw(p + 84, (1 << 14));
2039 stw(p + 85, (1 << 14));
2041 stw(p + 87, (1 << 14));
2044 static inline void ide_abort_command(IDEState *s)
2046 s->status = READY_STAT | ERR_STAT;
2047 s->error = ABRT_ERR;
2050 static inline void ide_set_irq(IDEState *s)
2052 if (!(ide_state[0].cmd & IDE_CMD_DISABLE_IRQ)) {
2053 pic_set_irq(s->irq, 1);
2057 /* prepare data transfer and tell what to do after */
2058 static void ide_transfer_start(IDEState *s, int size,
2059 EndTransferFunc *end_transfer_func)
2061 s->end_transfer_func = end_transfer_func;
2062 s->data_ptr = s->io_buffer;
2063 s->data_end = s->io_buffer + size;
2064 s->status |= DRQ_STAT;
2067 static void ide_transfer_stop(IDEState *s)
2069 s->end_transfer_func = ide_transfer_stop;
2070 s->data_ptr = s->io_buffer;
2071 s->data_end = s->io_buffer;
2072 s->status &= ~DRQ_STAT;
2075 static int64_t ide_get_sector(IDEState *s)
2078 if (s->select & 0x40) {
2080 sector_num = ((s->select & 0x0f) << 24) | (s->hcyl << 16) |
2081 (s->lcyl << 8) | s->sector;
2083 sector_num = ((s->hcyl << 8) | s->lcyl) * s->heads * s->sectors +
2084 (s->select & 0x0f) * s->sectors +
2090 static void ide_set_sector(IDEState *s, int64_t sector_num)
2092 unsigned int cyl, r;
2093 if (s->select & 0x40) {
2094 s->select = (s->select & 0xf0) | (sector_num >> 24);
2095 s->hcyl = (sector_num >> 16);
2096 s->lcyl = (sector_num >> 8);
2097 s->sector = (sector_num);
2099 cyl = sector_num / (s->heads * s->sectors);
2100 r = sector_num % (s->heads * s->sectors);
2103 s->select = (s->select & 0xf0) | (r / s->sectors);
2104 s->sector = (r % s->sectors) + 1;
2108 static void ide_sector_read(IDEState *s)
2113 s->status = READY_STAT | SEEK_STAT;
2114 sector_num = ide_get_sector(s);
2117 /* no more sector to read from disk */
2118 ide_transfer_stop(s);
2120 #if defined(DEBUG_IDE)
2121 printf("read sector=%Ld\n", sector_num);
2123 if (n > s->req_nb_sectors)
2124 n = s->req_nb_sectors;
2125 ret = bdrv_read(s->bs, sector_num, s->io_buffer, n);
2126 ide_transfer_start(s, 512 * n, ide_sector_read);
2128 ide_set_sector(s, sector_num + n);
2133 static void ide_sector_write(IDEState *s)
2138 s->status = READY_STAT | SEEK_STAT;
2139 sector_num = ide_get_sector(s);
2140 #if defined(DEBUG_IDE)
2141 printf("write sector=%Ld\n", sector_num);
2144 if (n > s->req_nb_sectors)
2145 n = s->req_nb_sectors;
2146 ret = bdrv_write(s->bs, sector_num, s->io_buffer, n);
2148 if (s->nsector == 0) {
2149 /* no more sector to write */
2150 ide_transfer_stop(s);
2153 if (n1 > s->req_nb_sectors)
2154 n1 = s->req_nb_sectors;
2155 ide_transfer_start(s, 512 * n1, ide_sector_write);
2157 ide_set_sector(s, sector_num + n);
2161 void ide_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
2163 IDEState *s = ide_state[0].cur_drive;
2168 printf("IDE: write addr=0x%x val=0x%02x\n", addr, val);
2192 unit = (val >> 4) & 1;
2193 s = &ide_state[unit];
2194 ide_state[0].cur_drive = s;
2200 #if defined(DEBUG_IDE)
2201 printf("ide: CMD=%02x\n", val);
2208 s->status = READY_STAT;
2209 ide_transfer_start(s, 512, ide_transfer_stop);
2211 ide_abort_command(s);
2217 s->status = READY_STAT;
2221 if (s->nsector > MAX_MULT_SECTORS ||
2223 (s->nsector & (s->nsector - 1)) != 0) {
2224 ide_abort_command(s);
2226 s->mult_sectors = s->nsector;
2227 s->status = READY_STAT;
2233 s->req_nb_sectors = 1;
2237 case WIN_WRITE_ONCE:
2238 s->status = SEEK_STAT;
2239 s->req_nb_sectors = 1;
2240 ide_transfer_start(s, 512, ide_sector_write);
2243 if (!s->mult_sectors)
2245 s->req_nb_sectors = s->mult_sectors;
2249 if (!s->mult_sectors)
2251 s->status = SEEK_STAT;
2252 s->req_nb_sectors = s->mult_sectors;
2254 if (n > s->req_nb_sectors)
2255 n = s->req_nb_sectors;
2256 ide_transfer_start(s, 512 * n, ide_sector_write);
2260 ide_abort_command(s);
2267 uint32_t ide_ioport_read(CPUX86State *env, uint32_t addr)
2269 IDEState *s = ide_state[0].cur_drive;
2281 ret = s->nsector & 0xff;
2298 pic_set_irq(s->irq, 0);
2302 printf("ide: read addr=0x%x val=%02x\n", addr, ret);
2307 uint32_t ide_status_read(CPUX86State *env, uint32_t addr)
2309 IDEState *s = ide_state[0].cur_drive;
2313 printf("ide: read addr=0x%x val=%02x\n", addr, ret);
2318 void ide_cmd_write(CPUX86State *env, uint32_t addr, uint32_t val)
2320 IDEState *s = &ide_state[0];
2321 /* common for both drives */
2325 void ide_data_writew(CPUX86State *env, uint32_t addr, uint32_t val)
2327 IDEState *s = ide_state[0].cur_drive;
2331 *(uint16_t *)p = tswap16(val);
2334 if (p >= s->data_end)
2335 s->end_transfer_func(s);
2338 uint32_t ide_data_readw(CPUX86State *env, uint32_t addr)
2340 IDEState *s = ide_state[0].cur_drive;
2345 ret = tswap16(*(uint16_t *)p);
2348 if (p >= s->data_end)
2349 s->end_transfer_func(s);
2353 void ide_data_writel(CPUX86State *env, uint32_t addr, uint32_t val)
2355 IDEState *s = ide_state[0].cur_drive;
2359 *(uint32_t *)p = tswap32(val);
2362 if (p >= s->data_end)
2363 s->end_transfer_func(s);
2366 uint32_t ide_data_readl(CPUX86State *env, uint32_t addr)
2368 IDEState *s = ide_state[0].cur_drive;
2373 ret = tswap32(*(uint32_t *)p);
2376 if (p >= s->data_end)
2377 s->end_transfer_func(s);
2381 void ide_reset(IDEState *s)
2383 s->mult_sectors = MAX_MULT_SECTORS;
2384 s->status = READY_STAT;
2395 for(i = 0; i < MAX_DISKS; i++) {
2397 s->bs = bs_table[i];
2399 bdrv_get_geometry(s->bs, &nb_sectors);
2400 cylinders = nb_sectors / (16 * 63);
2401 if (cylinders > 16383)
2403 else if (cylinders < 2)
2405 s->cylinders = cylinders;
2408 s->nb_sectors = nb_sectors;
2413 register_ioport_write(0x1f0, 8, ide_ioport_write, 1);
2414 register_ioport_read(0x1f0, 8, ide_ioport_read, 1);
2415 register_ioport_read(0x3f6, 1, ide_status_read, 1);
2416 register_ioport_write(0x3f6, 1, ide_cmd_write, 1);
2419 register_ioport_write(0x1f0, 2, ide_data_writew, 2);
2420 register_ioport_read(0x1f0, 2, ide_data_readw, 2);
2421 register_ioport_write(0x1f0, 4, ide_data_writel, 4);
2422 register_ioport_read(0x1f0, 4, ide_data_readl, 4);
2425 /***********************************************************/
2426 /* cpu signal handler */
2427 static void host_segv_handler(int host_signum, siginfo_t *info,
2430 if (cpu_signal_handler(host_signum, info, puc))
2436 static int timer_irq_pending;
2437 static int timer_irq_count;
2439 static void host_alarm_handler(int host_signum, siginfo_t *info,
2442 /* NOTE: since usually the OS asks a 100 Hz clock, there can be
2443 some drift between cpu_get_ticks() and the interrupt time. So
2444 we queue some interrupts to avoid missing some */
2445 timer_irq_count += pit_get_out_edges(&pit_channels[0]);
2446 if (timer_irq_count) {
2447 if (timer_irq_count > 2)
2448 timer_irq_count = 2;
2450 /* just exit from the cpu to have a chance to handle timers */
2451 cpu_x86_interrupt(global_env, CPU_INTERRUPT_EXIT);
2452 timer_irq_pending = 1;
2456 /* main execution loop */
2458 CPUState *cpu_gdbstub_get_env(void *opaque)
2463 void main_loop(void *opaque)
2465 struct pollfd ufds[2], *pf, *serial_ufd, *net_ufd, *gdb_ufd;
2466 int ret, n, timeout;
2468 CPUState *env = global_env;
2472 ret = cpu_x86_exec(env);
2474 /* if hlt instruction, we wait until the next IRQ */
2475 if (ret == EXCP_HLT)
2479 /* poll any events */
2482 if (!(serial_ports[0].lsr & UART_LSR_DR)) {
2485 pf->events = POLLIN;
2489 if (net_fd > 0 && ne2000_can_receive(&ne2000_state)) {
2492 pf->events = POLLIN;
2496 if (gdbstub_fd > 0) {
2498 pf->fd = gdbstub_fd;
2499 pf->events = POLLIN;
2503 ret = poll(ufds, pf - ufds, timeout);
2505 if (serial_ufd && (serial_ufd->revents & POLLIN)) {
2506 n = read(0, &ch, 1);
2508 serial_received_byte(&serial_ports[0], ch);
2511 if (net_ufd && (net_ufd->revents & POLLIN)) {
2512 uint8_t buf[MAX_ETH_FRAME_SIZE];
2514 n = read(net_fd, buf, MAX_ETH_FRAME_SIZE);
2517 memset(buf + n, 0, 60 - n);
2520 ne2000_receive(&ne2000_state, buf, n);
2523 if (gdb_ufd && (gdb_ufd->revents & POLLIN)) {
2525 /* stop emulation if requested by gdb */
2526 n = read(gdbstub_fd, buf, 1);
2533 if (timer_irq_pending) {
2536 timer_irq_pending = 0;
2543 printf("Virtual Linux version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
2544 "usage: vl [options] bzImage [kernel parameters...]\n"
2546 "'bzImage' is a Linux kernel image (PAGE_OFFSET must be defined\n"
2547 "to 0x90000000 in asm/page.h and arch/i386/vmlinux.lds)\n"
2549 "General options:\n"
2550 "-initrd file use 'file' as initial ram disk\n"
2551 "-hda file use 'file' as hard disk 0 image\n"
2552 "-hdb file use 'file' as hard disk 1 image\n"
2553 "-m megs set virtual RAM size to megs MB\n"
2554 "-n script set network init script [default=%s]\n"
2557 "-s wait gdb connection to port %d\n"
2558 "-p port change gdb connection port\n"
2559 "-d output log in /tmp/vl.log\n"
2561 "During emulation, use C-a h to get terminal commands:\n",
2562 DEFAULT_NETWORK_SCRIPT, DEFAULT_GDBSTUB_PORT);
2567 struct option long_options[] = {
2568 { "initrd", 1, NULL, 0, },
2569 { "hda", 1, NULL, 0, },
2570 { "hdb", 1, NULL, 0, },
2571 { NULL, 0, NULL, 0 },
2574 int main(int argc, char **argv)
2576 int c, ret, initrd_size, i, use_gdbstub, gdbstub_port, long_index;
2577 struct linux_params *params;
2578 struct sigaction act;
2579 struct itimerval itv;
2581 const char *tmpdir, *initrd_filename;
2582 const char *hd_filename[MAX_DISKS];
2584 /* we never want that malloc() uses mmap() */
2585 mallopt(M_MMAP_THRESHOLD, 4096 * 1024);
2586 initrd_filename = NULL;
2587 for(i = 0; i < MAX_DISKS; i++)
2588 hd_filename[i] = NULL;
2589 phys_ram_size = 32 * 1024 * 1024;
2590 pstrcpy(network_script, sizeof(network_script), DEFAULT_NETWORK_SCRIPT);
2592 gdbstub_port = DEFAULT_GDBSTUB_PORT;
2594 c = getopt_long_only(argc, argv, "hm:dn:sp:", long_options, &long_index);
2599 switch(long_index) {
2601 initrd_filename = optarg;
2604 hd_filename[0] = optarg;
2607 hd_filename[1] = optarg;
2615 phys_ram_size = atoi(optarg) * 1024 * 1024;
2616 if (phys_ram_size <= 0)
2623 pstrcpy(network_script, sizeof(network_script), optarg);
2629 gdbstub_port = atoi(optarg);
2638 logfile = fopen(DEBUG_LOGFILE, "w");
2640 perror(DEBUG_LOGFILE);
2643 setvbuf(logfile, NULL, _IOLBF, 0);
2646 /* open the virtual block devices */
2647 for(i = 0; i < MAX_DISKS; i++) {
2648 if (hd_filename[i]) {
2649 bs_table[i] = bdrv_open(hd_filename[i]);
2651 fprintf(stderr, "vl: could not open hard disk image '%s\n",
2658 /* init network tun interface */
2661 /* init the memory */
2662 tmpdir = getenv("VLTMPDIR");
2665 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/vlXXXXXX", tmpdir);
2666 if (mkstemp(phys_ram_file) < 0) {
2667 fprintf(stderr, "Could not create temporary memory file '%s'\n",
2671 phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);
2672 if (phys_ram_fd < 0) {
2673 fprintf(stderr, "Could not open temporary memory file '%s'\n",
2677 ftruncate(phys_ram_fd, phys_ram_size);
2678 unlink(phys_ram_file);
2679 phys_ram_base = mmap((void *)PHYS_RAM_BASE, phys_ram_size,
2680 PROT_WRITE | PROT_READ, MAP_SHARED | MAP_FIXED,
2682 if (phys_ram_base == MAP_FAILED) {
2683 fprintf(stderr, "Could not map physical memory\n");
2687 /* now we can load the kernel */
2688 ret = load_kernel(argv[optind], phys_ram_base + KERNEL_LOAD_ADDR);
2690 fprintf(stderr, "vl: could not load kernel '%s'\n", argv[optind]);
2696 if (initrd_filename) {
2697 initrd_size = load_image(initrd_filename, phys_ram_base + INITRD_LOAD_ADDR);
2698 if (initrd_size < 0) {
2699 fprintf(stderr, "vl: could not load initial ram disk '%s'\n",
2705 /* init kernel params */
2706 params = (void *)(phys_ram_base + KERNEL_PARAMS_ADDR);
2707 memset(params, 0, sizeof(struct linux_params));
2708 params->mount_root_rdonly = 0;
2709 params->cl_magic = 0xA33F;
2710 params->cl_offset = params->commandline - (uint8_t *)params;
2711 params->ext_mem_k = (phys_ram_size / 1024) - 1024;
2712 for(i = optind + 1; i < argc; i++) {
2713 if (i != optind + 1)
2714 pstrcat(params->commandline, sizeof(params->commandline), " ");
2715 pstrcat(params->commandline, sizeof(params->commandline), argv[i]);
2717 params->loader_type = 0x01;
2718 if (initrd_size > 0) {
2719 params->initrd_start = INITRD_LOAD_ADDR;
2720 params->initrd_size = initrd_size;
2722 params->orig_video_lines = 25;
2723 params->orig_video_cols = 80;
2725 /* init basic PC hardware */
2727 register_ioport_write(0x80, 1, ioport80_write, 1);
2729 register_ioport_write(0x3d4, 2, vga_ioport_write, 1);
2738 /* setup cpu signal handlers for MMU / self modifying code handling */
2739 sigfillset(&act.sa_mask);
2740 act.sa_flags = SA_SIGINFO;
2741 act.sa_sigaction = host_segv_handler;
2742 sigaction(SIGSEGV, &act, NULL);
2743 sigaction(SIGBUS, &act, NULL);
2745 act.sa_sigaction = host_alarm_handler;
2746 sigaction(SIGALRM, &act, NULL);
2748 /* init CPU state */
2751 cpu_single_env = env;
2753 /* setup basic memory access */
2754 env->cr[0] = 0x00000033;
2755 cpu_x86_init_mmu(env);
2757 memset(params->idt_table, 0, sizeof(params->idt_table));
2759 params->gdt_table[2] = 0x00cf9a000000ffffLL; /* KERNEL_CS */
2760 params->gdt_table[3] = 0x00cf92000000ffffLL; /* KERNEL_DS */
2762 env->idt.base = (void *)params->idt_table;
2763 env->idt.limit = sizeof(params->idt_table) - 1;
2764 env->gdt.base = (void *)params->gdt_table;
2765 env->gdt.limit = sizeof(params->gdt_table) - 1;
2767 cpu_x86_load_seg(env, R_CS, KERNEL_CS);
2768 cpu_x86_load_seg(env, R_DS, KERNEL_DS);
2769 cpu_x86_load_seg(env, R_ES, KERNEL_DS);
2770 cpu_x86_load_seg(env, R_SS, KERNEL_DS);
2771 cpu_x86_load_seg(env, R_FS, KERNEL_DS);
2772 cpu_x86_load_seg(env, R_GS, KERNEL_DS);
2774 env->eip = KERNEL_LOAD_ADDR;
2775 env->regs[R_ESI] = KERNEL_PARAMS_ADDR;
2778 itv.it_interval.tv_sec = 0;
2779 itv.it_interval.tv_usec = 1000;
2780 itv.it_value.tv_sec = 0;
2781 itv.it_value.tv_usec = 10 * 1000;
2782 setitimer(ITIMER_REAL, &itv, NULL);
2783 /* we probe the tick duration of the kernel to inform the user if
2784 the emulated kernel requested a too high timer frequency */
2785 getitimer(ITIMER_REAL, &itv);
2786 pit_min_timer_count = ((uint64_t)itv.it_interval.tv_usec * PIT_FREQ) /
2790 cpu_gdbstub(NULL, main_loop, gdbstub_port);