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gohigh
2024-02-19 01:11:57 -05:00
parent 7c80ef0753
commit 692092f8e0
817 changed files with 430745 additions and 0 deletions
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231
Book-Lite/linux-0.12/init/main.c Normal file
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/*
* linux/init/main.c
*
* (C) 1991 Linus Torvalds
*/
#define __LIBRARY__
#include <unistd.h>
#include <time.h>
/*
* we need this inline - forking from kernel space will result
* in NO COPY ON WRITE (!!!), until an execve is executed. This
* is no problem, but for the stack. This is handled by not letting
* main() use the stack at all after fork(). Thus, no function
* calls - which means inline code for fork too, as otherwise we
* would use the stack upon exit from 'fork()'.
*
* Actually only pause and fork are needed inline, so that there
* won't be any messing with the stack from main(), but we define
* some others too.
*/
static inline _syscall0(int,fork)
static inline _syscall0(int,pause)
static inline _syscall1(int,setup,void *,BIOS)
static inline _syscall0(int,sync)
#include <linux/tty.h>
#include <linux/sched.h>
#include <linux/head.h>
#include <asm/system.h>
#include <asm/io.h>
#include <stddef.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <linux/fs.h>
#include <string.h>
static char printbuf[1024];
extern char *strcpy();
extern int vsprintf();
extern void init(void);
extern void blk_dev_init(void);
extern void chr_dev_init(void);
extern void hd_init(void);
extern void floppy_init(void);
extern void mem_init(long start, long end);
extern long rd_init(long mem_start, int length);
extern long kernel_mktime(struct tm * tm);
static int sprintf(char * str, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i = vsprintf(str, fmt, args);
va_end(args);
return i;
}
/*
* This is set up by the setup-routine at boot-time
*/
#define EXT_MEM_K (*(unsigned short *)0x90002)
#define CON_ROWS ((*(unsigned short *)0x9000e) & 0xff)
#define CON_COLS (((*(unsigned short *)0x9000e) & 0xff00) >> 8)
#define DRIVE_INFO (*(struct drive_info *)0x90080)
#define ORIG_ROOT_DEV (*(unsigned short *)0x901FC)
#define ORIG_SWAP_DEV (*(unsigned short *)0x901FA)
/*
* Yeah, yeah, it's ugly, but I cannot find how to do this correctly
* and this seems to work. I anybody has more info on the real-time
* clock I'd be interested. Most of this was trial and error, and some
* bios-listing reading. Urghh.
*/
#define CMOS_READ(addr) ({ \
outb_p(0x80|addr,0x70); \
inb_p(0x71); \
})
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
static void time_init(void)
{
struct tm time;
do {
time.tm_sec = CMOS_READ(0);
time.tm_min = CMOS_READ(2);
time.tm_hour = CMOS_READ(4);
time.tm_mday = CMOS_READ(7);
time.tm_mon = CMOS_READ(8);
time.tm_year = CMOS_READ(9);
} while (time.tm_sec != CMOS_READ(0));
BCD_TO_BIN(time.tm_sec);
BCD_TO_BIN(time.tm_min);
BCD_TO_BIN(time.tm_hour);
BCD_TO_BIN(time.tm_mday);
BCD_TO_BIN(time.tm_mon);
BCD_TO_BIN(time.tm_year);
time.tm_mon--;
startup_time = kernel_mktime(&time);
}
static long memory_end = 0;
static long buffer_memory_end = 0;
static long main_memory_start = 0;
static char term[32];
static char * argv_rc[] = { "/bin/sh", NULL };
static char * envp_rc[] = { "HOME=/", NULL ,NULL };
static char * argv[] = { "-/bin/sh",NULL };
static char * envp[] = { "HOME=/usr/root", NULL, NULL };
struct drive_info { char dummy[32]; } drive_info;
void main(void) /* This really IS void, no error here. */
{ /* The startup routine assumes (well, ...) this */
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them
*/
ROOT_DEV = ORIG_ROOT_DEV;
SWAP_DEV = ORIG_SWAP_DEV;
sprintf(term, "TERM=con%dx%d", CON_COLS, CON_ROWS);
envp[1] = term;
envp_rc[1] = term;
drive_info = DRIVE_INFO;
memory_end = (1<<20) + (EXT_MEM_K<<10);
memory_end &= 0xfffff000;
if (memory_end > 16*1024*1024)
memory_end = 16*1024*1024;
if (memory_end > 12*1024*1024)
buffer_memory_end = 4*1024*1024;
else if (memory_end > 6*1024*1024)
buffer_memory_end = 2*1024*1024;
else
buffer_memory_end = 1*1024*1024;
main_memory_start = buffer_memory_end;
#ifdef RAMDISK
main_memory_start += rd_init(main_memory_start, RAMDISK*1024);
#endif
mem_init(main_memory_start,memory_end);
trap_init();
blk_dev_init();
chr_dev_init();
tty_init();
time_init();
sched_init();
buffer_init(buffer_memory_end);
hd_init();
floppy_init();
sti();
move_to_user_mode();
if (!fork()) { /* we count on this going ok */
init();
}
/*
* NOTE!! For any other task 'pause()' would mean we have to get a
* signal to awaken, but task0 is the sole exception (see 'schedule()')
* as task 0 gets activated at every idle moment (when no other tasks
* can run). For task0 'pause()' just means we go check if some other
* task can run, and if not we return here.
*/
for(;;)
__asm__("int $0x80"::"a" (__NR_pause):"ax");
}
static int printf(const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
write(1,printbuf,i=vsprintf(printbuf, fmt, args));
va_end(args);
return i;
}
void init(void)
{
int pid,i;
setup((void *) &drive_info);
(void) open("/dev/tty1",O_RDWR,0);
(void) dup(0);
(void) dup(0);
printf("%d buffers = %d bytes buffer space\n\r",NR_BUFFERS,
NR_BUFFERS*BLOCK_SIZE);
printf("Free mem: %d bytes\n\r",memory_end-main_memory_start);
if (!(pid=fork())) {
close(0);
if (open("/etc/rc",O_RDONLY,0))
_exit(1);
execve("/bin/sh",argv_rc,envp_rc);
_exit(2);
}
if (pid>0)
while (pid != wait(&i))
/* nothing */;
while (1) {
if ((pid=fork())<0) {
printf("Fork failed in init\r\n");
continue;
}
if (!pid) {
close(0);close(1);close(2);
setsid();
(void) open("/dev/tty1",O_RDWR,0);
(void) dup(0);
(void) dup(0);
_exit(execve("/bin/sh",argv,envp));
}
while (1)
if (pid == wait(&i))
break;
printf("\n\rchild %d died with code %04x\n\r",pid,i);
sync();
}
_exit(0); /* NOTE! _exit, not exit() */
}

551
Book-Lite/linux-0.12/init/main.s Normal file
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.file "init/main.c"
gcc_compiled.:
.text
LC0:
.ascii "out of memory\12\15\0"
.align 2
_sprintf:
movl 4(%esp),%edx
leal 12(%esp),%eax
pushl %eax
pushl 12(%esp)
pushl %edx
call _vsprintf
addl $12,%esp
ret
.align 2
_time_init:
pushl %ebp
movl %esp,%ebp
subl $44,%esp
L65:
movl $128,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-36(%ebp)
movl $130,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-32(%ebp)
movl $132,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-28(%ebp)
movl $135,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-24(%ebp)
movl $136,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-20(%ebp)
movl $137,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
movl %eax,-16(%ebp)
movl $128,%eax
movl $112,%edx
/APP
outb %al,%dx
jmp 1f
1: jmp 1f
1:
/NO_APP
movl $113,%edx
/APP
inb %dx,%al
jmp 1f
1: jmp 1f
1:
/NO_APP
movb %al,-40(%ebp)
movzbl -40(%ebp),%eax
cmpl -36(%ebp),%eax
jne L65
movl -36(%ebp),%eax
andl $15,%eax
movl -36(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-36(%ebp)
movl -32(%ebp),%eax
andl $15,%eax
movl -32(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-32(%ebp)
movl -28(%ebp),%eax
andl $15,%eax
movl -28(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-28(%ebp)
movl -24(%ebp),%eax
andl $15,%eax
movl -24(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-24(%ebp)
movl -20(%ebp),%eax
andl $15,%eax
movl -20(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-20(%ebp)
movl -16(%ebp),%eax
andl $15,%eax
movl -16(%ebp),%edx
sarl $4,%edx
leal (%edx,%edx,4),%edx
leal (%eax,%edx,2),%eax
movl %eax,-16(%ebp)
decl -20(%ebp)
leal -36(%ebp),%eax
pushl %eax
call _kernel_mktime
movl %eax,_startup_time
leave
ret
.data
.align 2
_memory_end:
.long 0
.align 2
_buffer_memory_end:
.long 0
.align 2
_main_memory_start:
.long 0
.text
LC1:
.ascii "/bin/sh\0"
.data
.align 2
_argv_rc:
.long LC1
.long 0
.text
LC2:
.ascii "HOME=/\0"
.data
.align 2
_envp_rc:
.long LC2
.long 0
.long 0
.text
LC3:
.ascii "-/bin/sh\0"
.data
.align 2
_argv:
.long LC3
.long 0
.text
LC4:
.ascii "HOME=/usr/root\0"
.data
.align 2
_envp:
.long LC4
.long 0
.long 0
.text
LC5:
.ascii "TERM=con%dx%d\0"
.align 2
.globl _main
_main:
pushl %ebp
movl %esp,%ebp
subl $8,%esp
pushl %edi
pushl %esi
movzwl 590332,%eax
movl %eax,_ROOT_DEV
movzwl 590330,%eax
movl %eax,_SWAP_DEV
movw 589838,%dx
andl $255,%edx
pushl %edx
movw 589838,%ax
andw $65280,%ax
shrw $8,%ax
movw %ax,-4(%ebp)
movzwl -4(%ebp),%eax
pushl %eax
pushl $LC5
pushl $_term
call _sprintf
movl $_term,_envp+4
movl $_term,_envp_rc+4
movl $_drive_info,%edi
movl $589952,%esi
movl $8,%ecx
cld
rep
movsl
movzwl 589826,%eax
sall $10,%eax
addl $1048576,%eax
movl %eax,_memory_end
andl $-4096,_memory_end
addl $16,%esp
cmpl $16777216,_memory_end
jle L69
movl $16777216,_memory_end
L69:
cmpl $12582912,_memory_end
jle L70
movl $4194304,_buffer_memory_end
jmp L71
.align 2
L70:
cmpl $6291456,_memory_end
jle L72
movl $2097152,_buffer_memory_end
jmp L71
.align 2
L72:
movl $1048576,_buffer_memory_end
L71:
movl _buffer_memory_end,%eax
movl %eax,_main_memory_start
pushl _memory_end
pushl _buffer_memory_end
call _mem_init
call _trap_init
call _blk_dev_init
call _chr_dev_init
call _tty_init
call _time_init
call _sched_init
pushl _buffer_memory_end
call _buffer_init
call _hd_init
call _floppy_init
/APP
sti
movl %esp,%eax
pushl $0x17
pushl %eax
pushfl
pushl $0x0f
pushl $1f
iret
1: movl $0x17,%eax
movw %ax,%ds
movw %ax,%es
movw %ax,%fs
movw %ax,%gs
/NO_APP
addl $12,%esp
movl $2,%eax
/APP
int $0x80
/NO_APP
movl %eax,%edx
testl %edx,%edx
jge L75
negl %edx
movl %edx,_errno
movl $-1,%edx
L75:
testl %edx,%edx
jne L74
call _init
L74:
L77:
movl $29,%eax
/APP
int $0x80
/NO_APP
jmp L77
.align 2
leal -16(%ebp),%esp
popl %esi
popl %edi
leave
ret
.align 2
_printf:
pushl %ebx
leal 12(%esp),%eax
pushl %eax
pushl 12(%esp)
pushl $_printbuf
call _vsprintf
movl %eax,%ebx
pushl %ebx
pushl $_printbuf
pushl $1
call _write
movl %ebx,%eax
addl $24,%esp
popl %ebx
ret
LC6:
.ascii "/dev/tty1\0"
LC7:
.ascii "%d buffers = %d bytes buffer space\12\15\0"
LC8:
.ascii "Free mem: %d bytes\12\15\0"
LC9:
.ascii "/etc/rc\0"
LC10:
.ascii "Fork failed in init\15\12\0"
LC11:
.ascii "\12\15child %d died with code %04x\12\15\0"
.align 2
.globl _init
_init:
pushl %ebp
movl %esp,%ebp
subl $4,%esp
pushl %edi
pushl %esi
pushl %ebx
xorl %eax,%eax
movl $_drive_info,%ebx
/APP
int $0x80
/NO_APP
testl %eax,%eax
jge L82
negl %eax
movl %eax,_errno
L82:
pushl $0
pushl $2
pushl $LC6
call _open
pushl $0
call _dup
pushl $0
call _dup
movl _nr_buffers,%eax
sall $10,%eax
pushl %eax
pushl _nr_buffers
pushl $LC7
call _printf
addl $32,%esp
movl _memory_end,%eax
subl _main_memory_start,%eax
pushl %eax
pushl $LC8
call _printf
addl $8,%esp
movl $2,%eax
/APP
int $0x80
/NO_APP
testl %eax,%eax
jl L86
movl %eax,%edi
jmp L85
.align 2
L86:
negl %eax
movl %eax,_errno
movl $-1,%edi
L85:
testl %edi,%edi
jne L84
pushl $0
call _close
pushl $0
pushl $0
pushl $LC9
call _open
addl $16,%esp
testl %eax,%eax
je L87
pushl $1
call __exit
.align 2
L87:
pushl $_envp_rc
pushl $_argv_rc
pushl $LC1
call _execve
pushl $2
call __exit
.align 2
L84:
testl %edi,%edi
jle L88
leal -4(%ebp),%esi
L89:
pushl %esi
call _wait
addl $4,%esp
cmpl %edi,%eax
jne L89
L88:
leal -4(%ebp),%esi
L91:
movl $2,%eax
/APP
int $0x80
/NO_APP
testl %eax,%eax
jge L94
negl %eax
movl %eax,_errno
movl $-1,%eax
L94:
movl %eax,%edi
testl %edi,%edi
jge L93
pushl $LC10
call _printf
addl $4,%esp
jmp L91
.align 2
L93:
testl %edi,%edi
jne L96
pushl $0
call _close
pushl $1
call _close
pushl $2
call _close
call _setsid
pushl $0
pushl $2
pushl $LC6
call _open
pushl $0
call _dup
pushl $0
call _dup
addl $32,%esp
pushl $_envp
pushl $_argv
pushl $LC1
call _execve
pushl %eax
call __exit
.align 2
L96:
L97:
pushl %esi
call _wait
addl $4,%esp
cmpl %edi,%eax
jne L97
pushl -4(%ebp)
pushl %edi
pushl $LC11
call _printf
addl $12,%esp
movl $36,%eax
/APP
int $0x80
/NO_APP
testl %eax,%eax
jge L91
negl %eax
movl %eax,_errno
jmp L91
.align 2
leal -16(%ebp),%esp
popl %ebx
popl %esi
popl %edi
leave
ret
.comm _drive_info,32
.lcomm _term,32
.lcomm _printbuf,1024