自己写操作系统--两个进程分别输出A和B

00000000000i[ ] Bochs x86 Emulator 2.3 00000000000i[ ] Build from CVS snapshot on August 27, 2006 00000000000i[ ] System configuration 00000000000i[ ] processors: 1 (cores=1, HT threads=1) 00000000000i[ ] A20 line support: yes 00000000000i[ ] APIC support: no 00000000000i[ ] CPU configuration 00000000000i[ ] level: 5 00000000000i[ ] paging support: yes, tlb enabled: yes 00000000000i[ ] SMP support: no 00000000000i[ ] FPU support: yes 00000000000i[ ] MMX support: yes 00000000000i[ ] SSE support: no 00000000000i[ ] v8086 mode support: yes 00000000000i[ ] VME support: yes 00000000000i[ ] 3dnow! support: no 00000000000i[ ] PAE support: no 00000000000i[ ] PGE support: no 00000000000i[ ] PSE support: yes 00000000000i[ ] x86-64 support: no 00000000000i[ ] SEP support: no 00000000000i[ ] Optimization configuration 00000000000i[ ] Guest2HostTLB support: no 00000000000i[ ] RepeatSpeedups support: no 00000000000i[ ] Icache support: no 00000000000i[ ] Host Asm support: yes 00000000000i[ ] Fast function calls: no 00000000000i[ ] Devices configuration 00000000000i[ ] NE2000 support: no 00000000000i[ ] PCI support: no 00000000000i[ ] SB16 support: no 00000000000i[ ] USB support: no 00000000000i[ ] VGA extension support: 00000000000i[MEM0 ] allocated memory at 0xb6e38008. after alignment, vector=0xb6e39000 00000000000i[MEM0 ] 4.00MB 00000000000i[MEM0 ] rom at 0xf0000/65536 ('/usr/local/share/bochs/BIOS-bochs-latest') 00000000000i[MEM0 ] rom at 0xc0000/32768 ('/usr/local/share/bochs/VGABIOS-elpin-2.40') 00000000000i[CMOS ] Using local time for initial clock 00000000000i[CMOS ] Setting initial clock to: Mon Nov 20 15:18:58 2006 (time0=1164007138) 00000000000i[DMA ] channel 4 used by cascade 00000000000i[DMA ] channel 2 used by Floppy Drive 00000000000i[FDD ] fd0: 'zsky.img' ro=0, h=2,t=80,spt=18 00000000000i[MEM0 ] Register memory access handlers: 000a0000-000bffff 00000000000i[XGUI ] test_alloc_colors: 16 colors available out of 16 colors tried 00000000000i[XGUI ] font 8 wide x 16 high, display depth = 24 00000000000i[VGA ] interval=40000 00000000000i[ ] init_mem of 'harddrv' plugin device by virtual method 00000000000i[ ] init_mem of 'keyboard' plugin device by virtual method 00000000000i[ ] init_mem of 'serial' plugin device by virtual method 00000000000i[ ] init_mem of 'parallel' plugin device by virtual method 00000000000i[ ] init_mem of 'extfpuirq' plugin device by virtual method 00000000000i[ ] init_mem of 'speaker' plugin device by virtual method 00000000000i[ ] init_dev of 'harddrv' plugin device by virtual method 00000000000i[HD ] Using boot sequence floppy, none, none 00000000000i[HD ] Floppy boot signature check is enabled 00000000000i[ ] init_dev of 'keyboard' plugin device by virtual method 00000000000i[KBD ] will paste characters every 1000 keyboard ticks 00000000000i[ ] init_dev of 'serial' plugin device by virtual method 00000000000i[SER ] com1 at 0x03f8 irq 4 00000000000i[ ] init_dev of 'parallel' plugin device by virtual method 00000000000i[PAR ] parallel port 1 at 0x0378 irq 7 00000000000i[ ] init_dev of 'extfpuirq' plugin device by virtual method 00000000000i[ ] init_dev of 'speaker' plugin device by virtual method 00000000000i[SPEAK] Open /dev/console successfully 00000000000i[SYS ] bx_pc_system_c::Reset(HARDWARE) called 00000000000i[ ] reset of 'harddrv' plugin device by virtual method 00000000000i[ ] reset of 'keyboard' plugin device by virtual method 00000000000i[ ] reset of 'serial' plugin device by virtual method 00000000000i[ ] reset of 'parallel' plugin device by virtual method 00000000000i[ ] reset of 'extfpuirq' plugin device by virtual method 00000000000i[ ] reset of 'speaker' plugin device by virtual method 00000000000i[XGUI ] [x] Mouse off 00000000000i[ ] Warning: no rc file specified. 00000000000i[ ] set SIGINT handler to bx_debug_ctrlc_handler 00000003867i[BIOS ] $Revision: 1.166 $ $Date: 2006/08/11 17:34:12 $ 00000080000e[VGA ] character height = 1, skipping text update 00000160000e[VGA ] character height = 1, skipping text update 00000240000e[VGA ] character height = 1, skipping text update 00000318070i[KBD ] reset-disable command received 00000320000e[VGA ] character height = 1, skipping text update 00000400000e[VGA ] character height = 1, skipping text update 00000480000i[XGUI ] charmap update. Font Height is 16 00008801769e[DEV ] read from port 0x0021 with len 2 returns 0xffff 00009123387i[ ] dbg: Quit 00009123387i[CPU ] protected mode 00009123387i[CPU ] CS.d_b = 32 bit 00009123387i[CPU ] SS.d_b = 32 bit 00009123387i[CPU ] | EAX=00000ff8 EBX=00000000 ECX=0000000e EDX=000b8000 00009123387i[CPU ] | ESP=0001ffec EBP=00000ffc ESI=00000000 EDI=00000000 00009123387i[CPU ] | IOPL=0 id vip vif ac vm rf nt of df if tf SF zf AF pf CF 00009123387i[CPU ] | SEG selector base limit G D 00009123387i[CPU ] | SEG sltr(index|ti|rpl) base limit G D 00009123387i[CPU ] | CS:0008( 0001| 0| 0) 00000000 000007ff 1 1 00009123387i[CPU ] | DS:0017( 0002| 1| 3) 00000000 00000fff 1 1 00009123387i[CPU ] | SS:0010( 0002| 0| 0) 00000000 000007ff 1 1 00009123387i[CPU ] | ES:0017( 0002| 1| 3) 00000000 00000fff 1 1 00009123387i[CPU ] | FS:0017( 0002| 1| 3) 00000000 00000fff 1 1 00009123387i[CPU ] | GS:0017( 0002| 1| 3) 00000000 00000fff 1 1 00009123387i[CPU ] | EIP=0000111c (0000111c) 00009123387i[CPU ] | CR0=0x00000019 CR1=0 CR2=0x00000000 00009123387i[CPU ] | CR3=0x00000000 CR4=0x00000000 00009123387i[CPU ] >> push ds : 1E 00009123387i[SYS ] Last time is 1164007142 00009123387i[XGUI ] Exit. 00009123387i[CTRL ] quit_sim called with exit code 0