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qemu-irix/vl.c

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/*
* QEMU based User Mode Linux
*
* This file is part of proprietary software - it is published here
* only for demonstration and information purposes.
*
* Copyright (c) 2003 Fabrice Bellard
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <inttypes.h>
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <malloc.h>
#include <termios.h>
#include <sys/poll.h>
#include <errno.h>
#include "cpu-i386.h"
#include "disas.h"
#define DEBUG_LOGFILE "/tmp/vl.log"
//#define DEBUG_UNUSED_IOPORT
#define PHYS_RAM_BASE 0xa8000000
#define KERNEL_LOAD_ADDR 0x00100000
#define INITRD_LOAD_ADDR 0x00400000
#define KERNEL_PARAMS_ADDR 0x00090000
/* from plex86 (BSD license) */
struct __attribute__ ((packed)) linux_params {
// For 0x00..0x3f, see 'struct screen_info' in linux/include/linux/tty.h.
// I just padded out the VESA parts, rather than define them.
/* 0x000 */ uint8_t orig_x;
/* 0x001 */ uint8_t orig_y;
/* 0x002 */ uint16_t ext_mem_k;
/* 0x004 */ uint16_t orig_video_page;
/* 0x006 */ uint8_t orig_video_mode;
/* 0x007 */ uint8_t orig_video_cols;
/* 0x008 */ uint16_t unused1;
/* 0x00a */ uint16_t orig_video_ega_bx;
/* 0x00c */ uint16_t unused2;
/* 0x00e */ uint8_t orig_video_lines;
/* 0x00f */ uint8_t orig_video_isVGA;
/* 0x010 */ uint16_t orig_video_points;
/* 0x012 */ uint8_t pad0[0x20 - 0x12]; // VESA info.
/* 0x020 */ uint16_t cl_magic; // Commandline magic number (0xA33F)
/* 0x022 */ uint16_t cl_offset; // Commandline offset. Address of commandline
// is calculated as 0x90000 + cl_offset, bu
// only if cl_magic == 0xA33F.
/* 0x024 */ uint8_t pad1[0x40 - 0x24]; // VESA info.
/* 0x040 */ uint8_t apm_bios_info[20]; // struct apm_bios_info
/* 0x054 */ uint8_t pad2[0x80 - 0x54];
// Following 2 from 'struct drive_info_struct' in drivers/block/cciss.h.
// Might be truncated?
/* 0x080 */ uint8_t hd0_info[16]; // hd0-disk-parameter from intvector 0x41
/* 0x090 */ uint8_t hd1_info[16]; // hd1-disk-parameter from intvector 0x46
// System description table truncated to 16 bytes
// From 'struct sys_desc_table_struct' in linux/arch/i386/kernel/setup.c.
/* 0x0a0 */ uint16_t sys_description_len;
/* 0x0a2 */ uint8_t sys_description_table[14];
// [0] machine id
// [1] machine submodel id
// [2] BIOS revision
// [3] bit1: MCA bus
/* 0x0b0 */ uint8_t pad3[0x1e0 - 0xb0];
/* 0x1e0 */ uint32_t alt_mem_k;
/* 0x1e4 */ uint8_t pad4[4];
/* 0x1e8 */ uint8_t e820map_entries;
/* 0x1e9 */ uint8_t eddbuf_entries; // EDD_NR
/* 0x1ea */ uint8_t pad5[0x1f1 - 0x1ea];
/* 0x1f1 */ uint8_t setup_sects; // size of setup.S, number of sectors
/* 0x1f2 */ uint16_t mount_root_rdonly; // MOUNT_ROOT_RDONLY (if !=0)
/* 0x1f4 */ uint16_t sys_size; // size of compressed kernel-part in the
// (b)zImage-file (in 16 byte units, rounded up)
/* 0x1f6 */ uint16_t swap_dev; // (unused AFAIK)
/* 0x1f8 */ uint16_t ramdisk_flags;
/* 0x1fa */ uint16_t vga_mode; // (old one)
/* 0x1fc */ uint16_t orig_root_dev; // (high=Major, low=minor)
/* 0x1fe */ uint8_t pad6[1];
/* 0x1ff */ uint8_t aux_device_info;
/* 0x200 */ uint16_t jump_setup; // Jump to start of setup code,
// aka "reserved" field.
/* 0x202 */ uint8_t setup_signature[4]; // Signature for SETUP-header, ="HdrS"
/* 0x206 */ uint16_t header_format_version; // Version number of header format;
/* 0x208 */ uint8_t setup_S_temp0[8]; // Used by setup.S for communication with
// boot loaders, look there.
/* 0x210 */ uint8_t loader_type;
// 0 for old one.
// else 0xTV:
// T=0: LILO
// T=1: Loadlin
// T=2: bootsect-loader
// T=3: SYSLINUX
// T=4: ETHERBOOT
// V=version
/* 0x211 */ uint8_t loadflags;
// bit0 = 1: kernel is loaded high (bzImage)
// bit7 = 1: Heap and pointer (see below) set by boot
// loader.
/* 0x212 */ uint16_t setup_S_temp1;
/* 0x214 */ uint32_t kernel_start;
/* 0x218 */ uint32_t initrd_start;
/* 0x21c */ uint32_t initrd_size;
/* 0x220 */ uint8_t setup_S_temp2[4];
/* 0x224 */ uint16_t setup_S_heap_end_pointer;
/* 0x226 */ uint8_t pad7[0x2d0 - 0x226];
/* 0x2d0 : Int 15, ax=e820 memory map. */
// (linux/include/asm-i386/e820.h, 'struct e820entry')
#define E820MAX 32
#define E820_RAM 1
#define E820_RESERVED 2
#define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
#define E820_NVS 4
struct {
uint64_t addr;
uint64_t size;
uint32_t type;
} e820map[E820MAX];
/* 0x550 */ uint8_t pad8[0x600 - 0x550];
// BIOS Enhanced Disk Drive Services.
// (From linux/include/asm-i386/edd.h, 'struct edd_info')
// Each 'struct edd_info is 78 bytes, times a max of 6 structs in array.
/* 0x600 */ uint8_t eddbuf[0x7d4 - 0x600];
/* 0x7d4 */ uint8_t pad9[0x800 - 0x7d4];
/* 0x800 */ uint8_t commandline[0x800];
/* 0x1000 */
uint64_t gdt_table[256];
uint64_t idt_table[48];
};
#define KERNEL_CS 0x10
#define KERNEL_DS 0x18
typedef void (IOPortWriteFunc)(CPUX86State *env, uint32_t address, uint32_t data);
typedef uint32_t (IOPortReadFunc)(CPUX86State *env, uint32_t address);
#define MAX_IOPORTS 1024
char phys_ram_file[1024];
CPUX86State *global_env;
FILE *logfile = NULL;
int loglevel;
IOPortReadFunc *ioport_readb_table[MAX_IOPORTS];
IOPortWriteFunc *ioport_writeb_table[MAX_IOPORTS];
IOPortReadFunc *ioport_readw_table[MAX_IOPORTS];
IOPortWriteFunc *ioport_writew_table[MAX_IOPORTS];
/***********************************************************/
/* x86 io ports */
uint32_t default_ioport_readb(CPUX86State *env, uint32_t address)
{
#ifdef DEBUG_UNUSED_IOPORT
fprintf(stderr, "inb: port=0x%04x\n", address);
#endif
return 0;
}
void default_ioport_writeb(CPUX86State *env, uint32_t address, uint32_t data)
{
#ifdef DEBUG_UNUSED_IOPORT
fprintf(stderr, "outb: port=0x%04x data=0x%02x\n", address, data);
#endif
}
/* default is to make two byte accesses */
uint32_t default_ioport_readw(CPUX86State *env, uint32_t address)
{
uint32_t data;
data = ioport_readb_table[address](env, address);
data |= ioport_readb_table[address + 1](env, address + 1) << 8;
return data;
}
void default_ioport_writew(CPUX86State *env, uint32_t address, uint32_t data)
{
ioport_writeb_table[address](env, address, data & 0xff);
ioport_writeb_table[address + 1](env, address + 1, (data >> 8) & 0xff);
}
void init_ioports(void)
{
int i;
for(i = 0; i < MAX_IOPORTS; i++) {
ioport_readb_table[i] = default_ioport_readb;
ioport_writeb_table[i] = default_ioport_writeb;
ioport_readw_table[i] = default_ioport_readw;
ioport_writew_table[i] = default_ioport_writew;
}
}
int register_ioport_readb(int start, int length, IOPortReadFunc *func)
{
int i;
for(i = start; i < start + length; i++)
ioport_readb_table[i] = func;
return 0;
}
int register_ioport_writeb(int start, int length, IOPortWriteFunc *func)
{
int i;
for(i = start; i < start + length; i++)
ioport_writeb_table[i] = func;
return 0;
}
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
if (buf_size <= 0)
return;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
int len;
len = strlen(buf);
if (len < buf_size)
pstrcpy(buf + len, buf_size - len, s);
return buf;
}
int load_kernel(const char *filename, uint8_t *addr)
{
int fd, size, setup_sects;
uint8_t bootsect[512];
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
if (read(fd, bootsect, 512) != 512)
goto fail;
setup_sects = bootsect[0x1F1];
if (!setup_sects)
setup_sects = 4;
/* skip 16 bit setup code */
lseek(fd, (setup_sects + 1) * 512, SEEK_SET);
size = read(fd, addr, 16 * 1024 * 1024);
if (size < 0)
goto fail;
close(fd);
return size;
fail:
close(fd);
return -1;
}
/* return the size or -1 if error */
int load_image(const char *filename, uint8_t *addr)
{
int fd, size;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
if (read(fd, addr, size) != size) {
close(fd);
return -1;
}
close(fd);
return size;
}
void cpu_x86_outb(CPUX86State *env, int addr, int val)
{
ioport_writeb_table[addr & (MAX_IOPORTS - 1)](env, addr, val);
}
void cpu_x86_outw(CPUX86State *env, int addr, int val)
{
ioport_writew_table[addr & (MAX_IOPORTS - 1)](env, addr, val);
}
void cpu_x86_outl(CPUX86State *env, int addr, int val)
{
fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}
int cpu_x86_inb(CPUX86State *env, int addr)
{
return ioport_readb_table[addr & (MAX_IOPORTS - 1)](env, addr);
}
int cpu_x86_inw(CPUX86State *env, int addr)
{
return ioport_readw_table[addr & (MAX_IOPORTS - 1)](env, addr);
}
int cpu_x86_inl(CPUX86State *env, int addr)
{
fprintf(stderr, "inl: port=0x%04x\n", addr);
return 0;
}
/***********************************************************/
void ioport80_write(CPUX86State *env, uint32_t addr, uint32_t data)
{
}
void hw_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "qemu: hardware error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
#ifdef TARGET_I386
cpu_x86_dump_state(global_env, stderr, X86_DUMP_FPU | X86_DUMP_CCOP);
#endif
va_end(ap);
abort();
}
/***********************************************************/
/* vga emulation */
static uint8_t vga_index;
static uint8_t vga_regs[256];
static int last_cursor_pos;
void update_console_messages(void)
{
int c, i, cursor_pos, eol;
cursor_pos = vga_regs[0x0f] | (vga_regs[0x0e] << 8);
eol = 0;
for(i = last_cursor_pos; i < cursor_pos; i++) {
c = phys_ram_base[0xb8000 + (i) * 2];
if (c >= ' ') {
putchar(c);
eol = 0;
} else {
if (!eol)
putchar('\n');
eol = 1;
}
}
fflush(stdout);
last_cursor_pos = cursor_pos;
}
/* just to see first Linux console messages, we intercept cursor position */
void vga_ioport_write(CPUX86State *env, uint32_t addr, uint32_t data)
{
switch(addr) {
case 0x3d4:
vga_index = data;
break;
case 0x3d5:
vga_regs[vga_index] = data;
if (vga_index == 0x0f)
update_console_messages();
break;
}
}
/***********************************************************/
/* cmos emulation */
#define RTC_SECONDS 0
#define RTC_SECONDS_ALARM 1
#define RTC_MINUTES 2
#define RTC_MINUTES_ALARM 3
#define RTC_HOURS 4
#define RTC_HOURS_ALARM 5
#define RTC_ALARM_DONT_CARE 0xC0
#define RTC_DAY_OF_WEEK 6
#define RTC_DAY_OF_MONTH 7
#define RTC_MONTH 8
#define RTC_YEAR 9
#define RTC_REG_A 10
#define RTC_REG_B 11
#define RTC_REG_C 12
#define RTC_REG_D 13
/* PC cmos mappings */
#define REG_EQUIPMENT_BYTE 0x14
uint8_t cmos_data[128];
uint8_t cmos_index;
void cmos_ioport_write(CPUX86State *env, uint32_t addr, uint32_t data)
{
if (addr == 0x70) {
cmos_index = data & 0x7f;
}
}
uint32_t cmos_ioport_read(CPUX86State *env, uint32_t addr)
{
int ret;
if (addr == 0x70) {
return 0xff;
} else {
/* toggle update-in-progress bit for Linux (same hack as
plex86) */
ret = cmos_data[cmos_index];
if (cmos_index == RTC_REG_A)
cmos_data[RTC_REG_A] ^= 0x80;
else if (cmos_index == RTC_REG_C)
cmos_data[RTC_REG_C] = 0x00;
return ret;
}
}
static inline int to_bcd(int a)
{
return ((a / 10) << 4) | (a % 10);
}
void cmos_init(void)
{
struct tm *tm;
time_t ti;
ti = time(NULL);
tm = gmtime(&ti);
cmos_data[RTC_SECONDS] = to_bcd(tm->tm_sec);
cmos_data[RTC_MINUTES] = to_bcd(tm->tm_min);
cmos_data[RTC_HOURS] = to_bcd(tm->tm_hour);
cmos_data[RTC_DAY_OF_WEEK] = to_bcd(tm->tm_wday);
cmos_data[RTC_DAY_OF_MONTH] = to_bcd(tm->tm_mday);
cmos_data[RTC_MONTH] = to_bcd(tm->tm_mon);
cmos_data[RTC_YEAR] = to_bcd(tm->tm_year % 100);
cmos_data[RTC_REG_A] = 0x26;
cmos_data[RTC_REG_B] = 0x02;
cmos_data[RTC_REG_C] = 0x00;
cmos_data[RTC_REG_D] = 0x80;
cmos_data[REG_EQUIPMENT_BYTE] = 0x02; /* FPU is there */
register_ioport_writeb(0x70, 2, cmos_ioport_write);
register_ioport_readb(0x70, 2, cmos_ioport_read);
}
/***********************************************************/
/* 8259 pic emulation */
typedef struct PicState {
uint8_t last_irr; /* edge detection */
uint8_t irr; /* interrupt request register */
uint8_t imr; /* interrupt mask register */
uint8_t isr; /* interrupt service register */
uint8_t priority_add; /* used to compute irq priority */
uint8_t irq_base;
uint8_t read_reg_select;
uint8_t special_mask;
uint8_t init_state;
uint8_t auto_eoi;
uint8_t rotate_on_autoeoi;
uint8_t init4; /* true if 4 byte init */
} PicState;
/* 0 is master pic, 1 is slave pic */
PicState pics[2];
int pic_irq_requested;
/* set irq level. If an edge is detected, then the IRR is set to 1 */
static inline void pic_set_irq1(PicState *s, int irq, int level)
{
int mask;
mask = 1 << irq;
if (level) {
if ((s->last_irr & mask) == 0)
s->irr |= mask;
s->last_irr |= mask;
} else {
s->last_irr &= ~mask;
}
}
static inline int get_priority(PicState *s, int mask)
{
int priority;
if (mask == 0)
return -1;
priority = 7;
while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
priority--;
return priority;
}
/* return the pic wanted interrupt. return -1 if none */
static int pic_get_irq(PicState *s)
{
int mask, cur_priority, priority;
mask = s->irr & ~s->imr;
priority = get_priority(s, mask);
if (priority < 0)
return -1;
/* compute current priority */
cur_priority = get_priority(s, s->isr);
if (priority > cur_priority) {
/* higher priority found: an irq should be generated */
return priority;
} else {
return -1;
}
}
void pic_set_irq(int irq, int level)
{
pic_set_irq1(&pics[irq >> 3], irq & 7, level);
}
/* can be called at any time outside cpu_exec() to raise irqs if
necessary */
void pic_handle_irq(void)
{
int irq2, irq;
/* first look at slave pic */
irq2 = pic_get_irq(&pics[1]);
if (irq2 >= 0) {
/* if irq request by slave pic, signal master PIC */
pic_set_irq1(&pics[0], 2, 1);
pic_set_irq1(&pics[0], 2, 0);
}
/* look at requested irq */
irq = pic_get_irq(&pics[0]);
if (irq >= 0) {
if (irq == 2) {
/* from slave pic */
pic_irq_requested = 8 + irq2;
} else {
/* from master pic */
pic_irq_requested = irq;
}
global_env->hard_interrupt_request = 1;
}
}
int cpu_x86_get_pic_interrupt(CPUX86State *env)
{
int irq, irq2, intno;
/* signal the pic that the irq was acked by the CPU */
irq = pic_irq_requested;
if (irq >= 8) {
irq2 = irq & 7;
pics[1].isr |= (1 << irq2);
pics[1].irr &= ~(1 << irq2);
irq = 2;
intno = pics[1].irq_base + irq2;
} else {
intno = pics[0].irq_base + irq;
}
pics[0].isr |= (1 << irq);
pics[0].irr &= ~(1 << irq);
return intno;
}
void pic_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
{
PicState *s;
int priority;
s = &pics[addr >> 7];
addr &= 1;
if (addr == 0) {
if (val & 0x10) {
/* init */
memset(s, 0, sizeof(PicState));
s->init_state = 1;
s->init4 = val & 1;
if (val & 0x02)
hw_error("single mode not supported");
if (val & 0x08)
hw_error("level sensitive irq not supported");
} else if (val & 0x08) {
if (val & 0x02)
s->read_reg_select = val & 1;
if (val & 0x40)
s->special_mask = (val >> 5) & 1;
} else {
switch(val) {
case 0x00:
case 0x80:
s->rotate_on_autoeoi = val >> 7;
break;
case 0x20: /* end of interrupt */
case 0xa0:
priority = get_priority(s, s->isr);
if (priority >= 0) {
s->isr &= ~(1 << ((priority + s->priority_add) & 7));
}
if (val == 0xa0)
s->priority_add = (s->priority_add + 1) & 7;
break;
case 0x60 ... 0x67:
priority = val & 7;
s->isr &= ~(1 << priority);
break;
case 0xc0 ... 0xc7:
s->priority_add = (val + 1) & 7;
break;
case 0xe0 ... 0xe7:
priority = val & 7;
s->isr &= ~(1 << priority);
s->priority_add = (priority + 1) & 7;
break;
}
}
} else {
switch(s->init_state) {
case 0:
/* normal mode */
s->imr = val;
break;
case 1:
s->irq_base = val & 0xf8;
s->init_state = 2;
break;
case 2:
if (s->init4) {
s->init_state = 3;
} else {
s->init_state = 0;
}
break;
case 3:
s->auto_eoi = (val >> 1) & 1;
s->init_state = 0;
break;
}
}
}
uint32_t pic_ioport_read(CPUX86State *env, uint32_t addr)
{
PicState *s;
s = &pics[addr >> 7];
addr &= 1;
if (addr == 0) {
if (s->read_reg_select)
return s->isr;
else
return s->irr;
} else {
return s->imr;
}
}
void pic_init(void)
{
register_ioport_writeb(0x20, 2, pic_ioport_write);
register_ioport_readb(0x20, 2, pic_ioport_read);
register_ioport_writeb(0xa0, 2, pic_ioport_write);
register_ioport_readb(0xa0, 2, pic_ioport_read);
}
/***********************************************************/
/* 8253 PIT emulation */
#define PIT_FREQ 1193182
#define RW_STATE_LSB 0
#define RW_STATE_MSB 1
#define RW_STATE_WORD0 2
#define RW_STATE_WORD1 3
#define RW_STATE_LATCHED_WORD0 4
#define RW_STATE_LATCHED_WORD1 5
typedef struct PITChannelState {
uint16_t count;
uint16_t latched_count;
uint8_t rw_state;
uint8_t mode;
uint8_t bcd; /* not supported */
uint8_t gate; /* timer start */
int64_t count_load_time;
} PITChannelState;
PITChannelState pit_channels[3];
int speaker_data_on;
int64_t ticks_per_sec;
int64_t get_clock(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000LL + tv.tv_usec;
}
int64_t cpu_get_ticks(void)
{
int64_t val;
asm("rdtsc" : "=A" (val));
return val;
}
void cpu_calibrate_ticks(void)
{
int64_t usec, ticks;
usec = get_clock();
ticks = cpu_get_ticks();
usleep(50 * 1000);
usec = get_clock() - usec;
ticks = cpu_get_ticks() - ticks;
ticks_per_sec = (ticks * 1000000LL + (usec >> 1)) / usec;
}
static int pit_get_count(PITChannelState *s)
{
int64_t d;
int counter;
d = ((cpu_get_ticks() - s->count_load_time) * PIT_FREQ) /
ticks_per_sec;
switch(s->mode) {
case 0:
case 1:
case 4:
case 5:
counter = (s->count - d) & 0xffff;
break;
default:
counter = s->count - (d % s->count);
break;
}
return counter;
}
/* get pit output bit */
static int pit_get_out(PITChannelState *s)
{
int64_t d;
int out;
d = ((cpu_get_ticks() - s->count_load_time) * PIT_FREQ) /
ticks_per_sec;
switch(s->mode) {
default:
case 0:
out = (d >= s->count);
break;
case 1:
out = (d < s->count);
break;
case 2:
if ((d % s->count) == 0 && d != 0)
out = 1;
else
out = 0;
break;
case 3:
out = (d % s->count) < (s->count >> 1);
break;
case 4:
case 5:
out = (d == s->count);
break;
}
return out;
}
void pit_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
{
int channel, access;
PITChannelState *s;
addr &= 3;
if (addr == 3) {
channel = val >> 6;
if (channel == 3)
return;
s = &pit_channels[channel];
access = (val >> 4) & 3;
switch(access) {
case 0:
s->latched_count = pit_get_count(s);
s->rw_state = RW_STATE_LATCHED_WORD0;
break;
default:
s->rw_state = access - 1 + RW_STATE_LSB;
break;
}
s->mode = (val >> 1) & 7;
s->bcd = val & 1;
} else {
s = &pit_channels[addr];
switch(s->rw_state) {
case RW_STATE_LSB:
s->count_load_time = cpu_get_ticks();
s->count = val;
break;
case RW_STATE_MSB:
s->count_load_time = cpu_get_ticks();
s->count = (val << 8);
break;
case RW_STATE_WORD0:
case RW_STATE_WORD1:
if (s->rw_state & 1) {
s->count_load_time = cpu_get_ticks();
s->count = (s->latched_count & 0xff) | (val << 8);
} else {
s->latched_count = val;
}
s->rw_state ^= 1;
break;
}
}
}
uint32_t pit_ioport_read(CPUX86State *env, uint32_t addr)
{
int ret, count;
PITChannelState *s;
addr &= 3;
s = &pit_channels[addr];
switch(s->rw_state) {
case RW_STATE_LSB:
case RW_STATE_MSB:
case RW_STATE_WORD0:
case RW_STATE_WORD1:
count = pit_get_count(s);
if (s->rw_state & 1)
ret = (count >> 8) & 0xff;
else
ret = count & 0xff;
if (s->rw_state & 2)
s->rw_state ^= 1;
break;
default:
case RW_STATE_LATCHED_WORD0:
case RW_STATE_LATCHED_WORD1:
if (s->rw_state & 1)
ret = s->latched_count >> 8;
else
ret = s->latched_count & 0xff;
s->rw_state ^= 1;
break;
}
return ret;
}
void speaker_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
{
speaker_data_on = (val >> 1) & 1;
pit_channels[2].gate = val & 1;
}
uint32_t speaker_ioport_read(CPUX86State *env, uint32_t addr)
{
int out;
out = pit_get_out(&pit_channels[2]);
return (speaker_data_on << 1) | pit_channels[2].gate | (out << 5);
}
void pit_init(void)
{
pit_channels[0].gate = 1;
pit_channels[1].gate = 1;
pit_channels[2].gate = 0;
register_ioport_writeb(0x40, 4, pit_ioport_write);
register_ioport_readb(0x40, 3, pit_ioport_read);
register_ioport_readb(0x61, 1, speaker_ioport_read);
register_ioport_writeb(0x61, 1, speaker_ioport_write);
cpu_calibrate_ticks();
}
/***********************************************************/
/* serial port emulation */
#define UART_IRQ 4
#define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
#define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
#define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
#define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
#define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
#define UART_IIR_NO_INT 0x01 /* No interrupts pending */
#define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
#define UART_IIR_MSI 0x00 /* Modem status interrupt */
#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
#define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
#define UART_LSR_TEMT 0x40 /* Transmitter empty */
#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
#define UART_LSR_BI 0x10 /* Break interrupt indicator */
#define UART_LSR_FE 0x08 /* Frame error indicator */
#define UART_LSR_PE 0x04 /* Parity error indicator */
#define UART_LSR_OE 0x02 /* Overrun error indicator */
#define UART_LSR_DR 0x01 /* Receiver data ready */
typedef struct SerialState {
uint8_t divider;
uint8_t rbr; /* receive register */
uint8_t ier;
uint8_t iir; /* read only */
uint8_t lcr;
uint8_t mcr;
uint8_t lsr; /* read only */
uint8_t msr;
uint8_t scr;
} SerialState;
SerialState serial_ports[1];
void serial_update_irq(void)
{
SerialState *s = &serial_ports[0];
if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) {
s->iir = UART_IIR_RDI;
} else if ((s->lsr & UART_LSR_THRE) && (s->ier & UART_IER_THRI)) {
s->iir = UART_IIR_THRI;
} else {
s->iir = UART_IIR_NO_INT;
}
if (s->iir != UART_IIR_NO_INT) {
pic_set_irq(UART_IRQ, 1);
} else {
pic_set_irq(UART_IRQ, 0);
}
}
void serial_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
{
SerialState *s = &serial_ports[0];
unsigned char ch;
int ret;
addr &= 7;
switch(addr) {
default:
case 0:
if (s->lcr & UART_LCR_DLAB) {
s->divider = (s->divider & 0xff00) | val;
} else {
s->lsr &= ~UART_LSR_THRE;
serial_update_irq();
ch = val;
do {
ret = write(1, &ch, 1);
} while (ret != 1);
s->lsr |= UART_LSR_THRE;
s->lsr |= UART_LSR_TEMT;
serial_update_irq();
}
break;
case 1:
if (s->lcr & UART_LCR_DLAB) {
s->divider = (s->divider & 0x00ff) | (val << 8);
} else {
s->ier = val;
serial_update_irq();
}
break;
case 2:
break;
case 3:
s->lcr = val;
break;
case 4:
s->mcr = val;
break;
case 5:
break;
case 6:
s->msr = val;
break;
case 7:
s->scr = val;
break;
}
}
uint32_t serial_ioport_read(CPUX86State *env, uint32_t addr)
{
SerialState *s = &serial_ports[0];
uint32_t ret;
addr &= 7;
switch(addr) {
default:
case 0:
if (s->lcr & UART_LCR_DLAB) {
ret = s->divider & 0xff;
} else {
ret = s->rbr;
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
serial_update_irq();
}
break;
case 1:
if (s->lcr & UART_LCR_DLAB) {
ret = (s->divider >> 8) & 0xff;
} else {
ret = s->ier;
}
break;
case 2:
ret = s->iir;
break;
case 3:
ret = s->lcr;
break;
case 4:
ret = s->mcr;
break;
case 5:
ret = s->lsr;
break;
case 6:
ret = s->msr;
break;
case 7:
ret = s->scr;
break;
}
return ret;
}
#define TERM_ESCAPE 0x01 /* ctrl-a is used for escape */
static int term_got_escape;
void term_print_help(void)
{
printf("\n"
"C-a h print this help\n"
"C-a x exit emulatior\n"
"C-a b send break (magic sysrq)\n"
"C-a C-a send C-a\n"
);
}
/* called when a char is received */
void serial_received_byte(SerialState *s, int ch)
{
if (term_got_escape) {
term_got_escape = 0;
switch(ch) {
case 'h':
term_print_help();
break;
case 'x':
exit(0);
break;
case 'b':
/* send break */
s->rbr = 0;
s->lsr |= UART_LSR_BI | UART_LSR_DR;
serial_update_irq();
break;
case TERM_ESCAPE:
goto send_char;
}
} else if (ch == TERM_ESCAPE) {
term_got_escape = 1;
} else {
send_char:
s->rbr = ch;
s->lsr |= UART_LSR_DR;
serial_update_irq();
}
}
/* init terminal so that we can grab keys */
static struct termios oldtty;
static void term_exit(void)
{
tcsetattr (0, TCSANOW, &oldtty);
}
static void term_init(void)
{
struct termios tty;
tcgetattr (0, &tty);
oldtty = tty;
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
|INLCR|IGNCR|ICRNL|IXON);
tty.c_oflag |= OPOST;
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN|ISIG);
tty.c_cflag &= ~(CSIZE|PARENB);
tty.c_cflag |= CS8;
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
tcsetattr (0, TCSANOW, &tty);
atexit(term_exit);
fcntl(0, F_SETFL, O_NONBLOCK);
}
void serial_init(void)
{
SerialState *s = &serial_ports[0];
s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
register_ioport_writeb(0x3f8, 8, serial_ioport_write);
register_ioport_readb(0x3f8, 8, serial_ioport_read);
term_init();
}
/* cpu signal handler */
static void host_segv_handler(int host_signum, siginfo_t *info,
void *puc)
{
if (cpu_signal_handler(host_signum, info, puc))
return;
term_exit();
abort();
}
static int timer_irq_pending;
static void host_alarm_handler(int host_signum, siginfo_t *info,
void *puc)
{
/* just exit from the cpu to have a change to handle timers */
cpu_x86_interrupt(global_env);
timer_irq_pending = 1;
}
void help(void)
{
printf("Virtual Linux version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
"usage: vl [-h] bzImage initrd [kernel parameters...]\n"
"\n"
"'bzImage' is a Linux kernel image (PAGE_OFFSET must be defined\n"
"to 0x90000000 in asm/page.h and arch/i386/vmlinux.lds)\n"
"'initrd' is an initrd image\n"
"-m megs set virtual RAM size to megs MB\n"
"-d output log in /tmp/vl.log\n"
"\n"
"During emulation, use C-a h to get terminal commands:\n"
);
term_print_help();
exit(1);
}
int main(int argc, char **argv)
{
int c, ret, initrd_size, i;
struct linux_params *params;
struct sigaction act;
struct itimerval itv;
CPUX86State *env;
/* we never want that malloc() uses mmap() */
mallopt(M_MMAP_THRESHOLD, 4096 * 1024);
phys_ram_size = 32 * 1024 * 1024;
for(;;) {
c = getopt(argc, argv, "hm:d");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'm':
phys_ram_size = atoi(optarg) * 1024 * 1024;
if (phys_ram_size <= 0)
help();
break;
case 'd':
loglevel = 1;
break;
}
}
if (optind + 1 >= argc)
help();
/* init debug */
if (loglevel) {
logfile = fopen(DEBUG_LOGFILE, "w");
if (!logfile) {
perror(DEBUG_LOGFILE);
_exit(1);
}
setvbuf(logfile, NULL, _IOLBF, 0);
}
/* init the memory */
strcpy(phys_ram_file, "/tmp/vlXXXXXX");
if (mkstemp(phys_ram_file) < 0) {
fprintf(stderr, "Could not create temporary memory file\n");
exit(1);
}
phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);
if (phys_ram_fd < 0) {
fprintf(stderr, "Could not open temporary memory file\n");
exit(1);
}
ftruncate(phys_ram_fd, phys_ram_size);
unlink(phys_ram_file);
phys_ram_base = mmap((void *)PHYS_RAM_BASE, phys_ram_size,
PROT_WRITE | PROT_READ, MAP_SHARED | MAP_FIXED,
phys_ram_fd, 0);
if (phys_ram_base == MAP_FAILED) {
fprintf(stderr, "Could not map physical memory\n");
exit(1);
}
/* now we can load the kernel */
ret = load_kernel(argv[optind], phys_ram_base + KERNEL_LOAD_ADDR);
if (ret < 0) {
fprintf(stderr, "%s: could not load kernel\n", argv[optind]);
exit(1);
}
/* load initrd */
initrd_size = load_image(argv[optind + 1], phys_ram_base + INITRD_LOAD_ADDR);
if (initrd_size < 0) {
fprintf(stderr, "%s: could not load initrd\n", argv[optind + 1]);
exit(1);
}
/* init kernel params */
params = (void *)(phys_ram_base + KERNEL_PARAMS_ADDR);
memset(params, 0, sizeof(struct linux_params));
params->mount_root_rdonly = 0;
params->cl_magic = 0xA33F;
params->cl_offset = params->commandline - (uint8_t *)params;
params->ext_mem_k = (phys_ram_size / 1024) - 1024;
for(i = optind + 2; i < argc; i++) {
if (i != optind + 2)
pstrcat(params->commandline, sizeof(params->commandline), " ");
pstrcat(params->commandline, sizeof(params->commandline), argv[i]);
}
params->loader_type = 0x01;
if (initrd_size > 0) {
params->initrd_start = INITRD_LOAD_ADDR;
params->initrd_size = initrd_size;
}
params->orig_video_lines = 25;
params->orig_video_cols = 80;
/* init basic PC hardware */
init_ioports();
register_ioport_writeb(0x80, 1, ioport80_write);
register_ioport_writeb(0x3d4, 2, vga_ioport_write);
cmos_init();
pic_init();
pit_init();
serial_init();
/* setup cpu signal handlers for MMU / self modifying code handling */
sigfillset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = host_segv_handler;
sigaction(SIGSEGV, &act, NULL);
sigaction(SIGBUS, &act, NULL);
act.sa_sigaction = host_alarm_handler;
sigaction(SIGALRM, &act, NULL);
/* init CPU state */
env = cpu_init();
global_env = env;
/* setup basic memory access */
env->cr[0] = 0x00000033;
cpu_x86_init_mmu(env);
memset(params->idt_table, 0, sizeof(params->idt_table));
params->gdt_table[2] = 0x00cf9a000000ffffLL; /* KERNEL_CS */
params->gdt_table[3] = 0x00cf92000000ffffLL; /* KERNEL_DS */
env->idt.base = (void *)params->idt_table;
env->idt.limit = sizeof(params->idt_table) - 1;
env->gdt.base = (void *)params->gdt_table;
env->gdt.limit = sizeof(params->gdt_table) - 1;
cpu_x86_load_seg(env, R_CS, KERNEL_CS);
cpu_x86_load_seg(env, R_DS, KERNEL_DS);
cpu_x86_load_seg(env, R_ES, KERNEL_DS);
cpu_x86_load_seg(env, R_SS, KERNEL_DS);
cpu_x86_load_seg(env, R_FS, KERNEL_DS);
cpu_x86_load_seg(env, R_GS, KERNEL_DS);
env->eip = KERNEL_LOAD_ADDR;
env->regs[R_ESI] = KERNEL_PARAMS_ADDR;
env->eflags = 0x2;
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 10 * 1000;
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = 10 * 1000;
setitimer(ITIMER_REAL, &itv, NULL);
for(;;) {
struct pollfd ufds[1], *pf;
int ret, n, timeout;
uint8_t ch;
ret = cpu_x86_exec(env);
/* if hlt instruction, we wait until the next IRQ */
if (ret == EXCP_HLT)
timeout = 10;
else
timeout = 0;
/* poll any events */
pf = ufds;
if (!(serial_ports[0].lsr & UART_LSR_DR)) {
pf->fd = 0;
pf->events = POLLIN;
pf++;
}
ret = poll(ufds, pf - ufds, timeout);
if (ret > 0) {
if (ufds[0].revents & POLLIN) {
n = read(0, &ch, 1);
if (n == 1) {
serial_received_byte(&serial_ports[0], ch);
}
}
}
/* just for testing */
if (timer_irq_pending) {
pic_set_irq(0, 1);
pic_set_irq(0, 0);
timer_irq_pending = 0;
}
pic_handle_irq();
}
return 0;
}
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