311 lines
7.3 KiB
NASM
311 lines
7.3 KiB
NASM
[section .text]
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; 导入
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extern StackTop ; kern/astart.asm
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extern tss ; inc/kern/protect.h
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extern exception_handler ; inc/kern/trap.h
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extern irq_table ; inc/kern/trap.h
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extern syscall_handler ; inc/kern/trap.h
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extern p_proc_ready ; inc/kern/process.h
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; 具体看inc/kern/process.h pcb维护的寄存器表
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P_STACKBASE equ 0
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GSREG equ P_STACKBASE
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FSREG equ GSREG + 4
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ESREG equ FSREG + 4
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DSREG equ ESREG + 4
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EDIREG equ DSREG + 4
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ESIREG equ EDIREG + 4
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EBPREG equ ESIREG + 4
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KERNELESPREG equ EBPREG + 4
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EBXREG equ KERNELESPREG + 4
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EDXREG equ EBXREG + 4
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ECXREG equ EDXREG + 4
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EAXREG equ ECXREG + 4
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RETADR equ EAXREG + 4
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EIPREG equ RETADR + 4
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CSREG equ EIPREG + 4
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EFLAGSREG equ CSREG + 4
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ESPREG equ EFLAGSREG + 4
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SSREG equ ESPREG + 4
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P_STACKTOP equ SSREG + 4
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extern to_kern_stack ; kern/process.c
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save:
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pushad ; `.
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push ds ; |
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push es ; | 保存原寄存器值
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push fs ; |
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push gs ; /
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mov dx, ss
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mov ds, dx
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mov es, dx
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mov eax, esp
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test dword [eax + CSREG - P_STACKBASE], 3
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jz .1 ; 根据段寄存器的状态信息判断是否发生内核重入
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mov esp, StackTop ; 如果没有发生内核重入就意味着要到用户栈了，先将esp移入临时内核栈
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push eax ; 传入进程表首地址信息
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call to_kern_stack ; 这个函数之后esp变为进程内核栈
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pop eax ; 恢复进程表首地址信息（这个是restart第一句话要用的）
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.1:
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push eax ; 将restart要用的，如果在内核栈重入，pop esp不会有任何变化
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push restart ; 否则eax在进程表首地址，pop esp会使esp移动到用户栈栈底
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jmp [eax + RETADR - P_STACKBASE]
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restart:
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pop esp ; 获悉当前的esp该到哪，不用管现在是否要回用户态，语义在save中有解释
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pop gs
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pop fs
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pop es
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pop ds
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popad
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add esp, 4
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iretd
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; 系统调用
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int_syscall:
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call save
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sti
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call syscall_handler
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cli
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ret
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EOI equ 0x20
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INT_M_CTL equ 0x20 ; I/O port for interrupt controller <Master>
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INT_M_CTLMASK equ 0x21 ; setting bits in this port disables ints <Master>
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INT_S_CTL equ 0xA0 ; I/O port for second interrupt controller <Slave>
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INT_S_CTLMASK equ 0xA1 ; setting bits in this port disables ints <Slave>
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; 中断和异常 -- 硬件中断
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; ---------------------------------
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%macro hwint_master 1
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call save
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in al, INT_M_CTLMASK ; `.
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or al, (1 << %1) ; | 屏蔽当前中断
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out INT_M_CTLMASK, al ; /
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mov al, EOI ; `. 置EOI位
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out INT_M_CTL, al ; /
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sti ; CPU在响应中断的过程中会自动关中断，这句之后就允许响应新的中断
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push %1 ; `.
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call [irq_table + 4 * %1] ; | 中断处理程序
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pop ecx ; /
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cli
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in al, INT_M_CTLMASK ; `.
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and al, ~(1 << %1) ; | 恢复接受当前中断
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out INT_M_CTLMASK, al ; /
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ret
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%endmacro
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; 时钟中断采取全程关中断的模式，时钟中断相当重要，不允许被打扰
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ALIGN 16
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hwint00: ; Interrupt routine for irq 0 (the clock).
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call save
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mov al, EOI
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out INT_M_CTL, al
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push 0
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call [irq_table + 0]
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pop ecx
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ret
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ALIGN 16
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hwint01: ; Interrupt routine for irq 1 (keyboard)
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hwint_master 1
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ALIGN 16
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hwint02: ; Interrupt routine for irq 2 (cascade!)
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hwint_master 2
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ALIGN 16
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hwint03: ; Interrupt routine for irq 3 (second serial)
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hwint_master 3
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ALIGN 16
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hwint04: ; Interrupt routine for irq 4 (first serial)
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hwint_master 4
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ALIGN 16
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hwint05: ; Interrupt routine for irq 5 (XT winchester)
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hwint_master 5
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ALIGN 16
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hwint06: ; Interrupt routine for irq 6 (floppy)
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hwint_master 6
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ALIGN 16
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hwint07: ; Interrupt routine for irq 7 (printer)
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hwint_master 7
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; ---------------------------------
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%macro hwint_slave 1
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hlt ; 后面的8个外设中断暂时不需要，先hlt休眠核
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%endmacro
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; ---------------------------------
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ALIGN 16
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hwint08: ; Interrupt routine for irq 8 (realtime clock).
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hwint_slave 8
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ALIGN 16
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hwint09: ; Interrupt routine for irq 9 (irq 2 redirected)
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hwint_slave 9
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ALIGN 16
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hwint10: ; Interrupt routine for irq 10
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hwint_slave 10
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ALIGN 16
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hwint11: ; Interrupt routine for irq 11
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hwint_slave 11
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ALIGN 16
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hwint12: ; Interrupt routine for irq 12
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hwint_slave 12
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ALIGN 16
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hwint13: ; Interrupt routine for irq 13 (FPU exception)
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hwint_slave 13
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ALIGN 16
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hwint14: ; Interrupt routine for irq 14 (AT winchester)
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hwint_slave 14
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ALIGN 16
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hwint15: ; Interrupt routine for irq 15
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hwint_slave 15
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; 中断和异常 -- 异常
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divide_error:
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push 0xFFFFFFFF ; no err code
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push 0 ; vector_no = 0
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jmp exception
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single_step_exception:
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push 0xFFFFFFFF ; no err code
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push 1 ; vector_no = 1
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jmp exception
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nmi:
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push 0xFFFFFFFF ; no err code
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push 2 ; vector_no = 2
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jmp exception
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breakpoint_exception:
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push 0xFFFFFFFF ; no err code
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push 3 ; vector_no = 3
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jmp exception
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overflow:
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push 0xFFFFFFFF ; no err code
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push 4 ; vector_no = 4
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jmp exception
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bounds_check:
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push 0xFFFFFFFF ; no err code
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push 5 ; vector_no = 5
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jmp exception
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inval_opcode:
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push 0xFFFFFFFF ; no err code
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push 6 ; vector_no = 6
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jmp exception
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copr_not_available:
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push 0xFFFFFFFF ; no err code
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push 7 ; vector_no = 7
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jmp exception
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double_fault:
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push 8 ; vector_no = 8
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jmp exception
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copr_seg_overrun:
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push 0xFFFFFFFF ; no err code
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push 9 ; vector_no = 9
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jmp exception
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inval_tss:
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push 10 ; vector_no = A
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jmp exception
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segment_not_present:
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push 11 ; vector_no = B
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jmp exception
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stack_exception:
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push 12 ; vector_no = C
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jmp exception
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general_protection:
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push 13 ; vector_no = D
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jmp exception
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page_fault:
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push eax
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mov eax, [esp + 4]
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mov [StackTop - 1024], eax
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pop eax
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pushad ; `.
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push ds ; |
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push es ; | 保存原寄存器值
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push fs ; |
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push gs ; /
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mov dx, ss
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mov ds, dx
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mov es, dx
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mov eax, esp
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test dword [eax + CSREG - P_STACKBASE], 3
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jz .1 ; 根据段寄存器的状态信息判断是否发生内核重入
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mov esp, StackTop ; 如果没有发生内核重入就意味着要到用户栈了，先将esp移入临时内核栈
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push eax ; 传入进程表首地址信息
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call to_kern_stack ; 这个函数之后esp变为进程内核栈
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pop eax ; 恢复进程表首地址信息（这个是restart第一句话要用的）
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.1:
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mov ecx, [eax + EFLAGSREG - P_STACKBASE]
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push ecx
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mov ecx, [eax + CSREG - P_STACKBASE]
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push ecx
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mov ecx, [eax + EIPREG - P_STACKBASE]
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push ecx
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mov ebx, [StackTop - 1024]
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push ebx
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push 14 ; vector_no = E
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jmp exception
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copr_error:
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push 0xFFFFFFFF ; no err code
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push 16 ; vector_no = 10h
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jmp exception
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exception:
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call exception_handler
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add esp, 4*2 ; 让栈顶指向 EIP，堆栈中从顶向下依次是：EIP、CS、EFLAGS
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hlt
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; 一堆符号导出，没别的
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global restart
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; 系统调用
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global int_syscall
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; 异常处理
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global divide_error
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global single_step_exception
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global nmi
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global breakpoint_exception
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global overflow
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global bounds_check
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global inval_opcode
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global copr_not_available
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global double_fault
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global copr_seg_overrun
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global inval_tss
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global segment_not_present
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global stack_exception
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global general_protection
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global page_fault
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global copr_error
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; 外设中断
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global hwint00
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global hwint01
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global hwint02
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global hwint03
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global hwint04
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global hwint05
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global hwint06
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global hwint07
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global hwint08
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global hwint09
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global hwint10
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global hwint11
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global hwint12
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global hwint13
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global hwint14
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global hwint15 |