X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/bb793d5c6918efee6a86de442463a7c9aaa4ecdd..b91be0033265b5b6bd716bd39cb0971da41906c4:/lunaix-os/kernel/asm/x86/interrupt.S

diff --git a/lunaix-os/kernel/asm/x86/interrupt.S b/lunaix-os/kernel/asm/x86/interrupt.S
deleted file mode 100644
index f308503..0000000
--- a/lunaix-os/kernel/asm/x86/interrupt.S
+++ /dev/null
@@ -1,219 +0,0 @@
-#define __ASM__
-#include <arch/x86/interrupts.h>
-#include <arch/x86/i386_asm.h>
-#include <arch/x86/tss.h>
-#include <lunaix/syscall.h>
-#include <arch/x86/interrupt.S.inc>
-
-#define __ASM_INTR_DIAGNOSIS
-
-#ifdef __ASM_INTR_DIAGNOSIS
-.section .bss
-    .global debug_resv
-    debug_resv:
-        .skip 16
-    tmp_store:
-        .skip 4
-#endif
-
-.section .bss
-    .align 16
-    lo_tmp_stack:
-        .skip 256
-    tmp_stack:
-
-/*
-    This perhaps the ugliest part in the project. 
-    It contains code to handle arbitrary depth of 
-    nested interrupt and all those corner cases and 
-    nasty gotchas.
-
-    Be aware the twists, offsets and hidden dependencies!
-
-*/
-
-.section .text
-    .global interrupt_wrapper
-    interrupt_wrapper:
-        cld
-
-        subl $4, %esp
-        pushl %esp
-
-        subl $16, %esp
-        movw %gs, 12(%esp)
-        movw %fs,  8(%esp)
-        movw %es,  4(%esp)
-        movw %ds,   (%esp)
-
-        pushl %esi
-        pushl %ebp
-        pushl %edi
-        pushl %edx
-        pushl %ecx
-        pushl %ebx
-        pushl %eax
-
-        movl __current, %eax
-        movl proc_intr_ctx(%eax), %eax
-        incl %eax
-        pushl %eax          # nested intr: current depth
-
-        movl ics(%esp), %eax   /* 取出 %cs */
-        andl $0x3, %eax          /* 判断 RPL */
-        jz 1f
-
-    /* crossing the user/kernel boundary */
-        movw $KDATA_SEG, %ax
-        movw %ax, %gs
-        movw %ax, %fs
-        movw %ax, %ds
-        movw %ax, %es
-
-        movl __current, %ebx
-
-        # Save x87 context to user stack, rather than kernel's memory.
-        # XXX what will happen if we triggered a page fault during fxsave?
-        # FIXME can we remove this overhead?
-        movl iuesp(%esp), %eax
-        andl $stack_alignment, %eax 
-        subl $512, %eax
-        fxsave (%eax)
-
-        # 保存用户栈顶指针。因为我们允许同级中断的产生，所以需要该手段跟踪用户栈的地址。
-        movl %eax, proc_ustack_top(%ebx)     # 存入__current->ustack_top
-
-    /* kernel space same-level switch */
-    1:
-        movl %esp, %eax
-        andl $stack_alignment, %esp
-        subl $16, %esp
-        movl %eax, (%esp)
-
-        call intr_handler
-
-        movl (%esp), %eax
-
-    .global soft_iret
-    soft_iret:
-        movl %eax, %esp
-
-#ifdef __ASM_INTR_DIAGNOSIS
-        movl %eax, (debug_resv + 8)
-        movl iesp(%esp), %eax
-        movl exeip(%eax), %eax
-        movl %eax, (debug_resv + 4) # eip
-#endif
-
-        movl ics(%esp), %eax
-        andl $3, %eax
-        jz 1f 
-
-        movl __current, %eax
-        movl proc_ustack_top(%eax), %eax
-        test %eax, %eax
-        jz 1f
-        fxrstor (%eax)
-
-1:
-        popl %eax   # discard isr_param::depth
-        popl %eax
-        popl %ebx
-        popl %ecx
-        popl %edx
-        popl %edi
-        popl %ebp
-        popl %esi
-        
-        movw   (%esp), %ds
-        movw  4(%esp), %es
-        movw  8(%esp), %fs
-        movw 12(%esp), %gs
-
-        movl 16(%esp), %esp
-
-        movl %eax, tmp_store
-        movl __current, %eax
-
-        # nested intr: restore saved context
-        popl proc_intr_ctx(%eax)
-
-        addl $8, %esp
-
-#ifdef __ASM_INTR_DIAGNOSIS
-        movl (%esp), %eax
-        movl %eax, debug_resv
-#endif
-        # 处理TSS.ESP的一些边界条件。如果是正常iret（即从内核模式*优雅地*退出）
-        # 那么TSS.ESP0应该为iret进行弹栈后，%esp的值。
-        # 所以这里的边界条件是：如返回用户模式，iret会额外弹出8个字节（ss,esp）
-        movl 4(%esp), %eax
-        andl $3, %eax
-        setnz %al
-        shll $3, %eax
-        addl $12, %eax
-        addl %esp, %eax
-        movl %eax, (_tss + tss_esp0_off)
-        movl tmp_store, %eax
-
-        iret
-
-    .global switch_to
-    switch_to:
-        # 约定
-        # arg1: 目标进程PCB地址 (next
-
-        popl %ebx               # next
-        movl __current, %eax    
-        movl proc_page_table(%eax), %ecx     # __current->pagetable
-        movl proc_page_table(%ebx), %eax     # next->pagetable
-        
-        cmpl %ecx, %eax         # if(next->pagtable != __current->pagetable) {
-        jz 1f
-        movl %eax, %cr3         #   cpu_lcr3(next->pagetable)
-                                # }
-    1:
-        movl %ebx, __current    # __current = next
-
-        # 我们已经处在了新的地址空间，为了避免影响其先前的栈布局
-        # 需要使用一个临时的栈空间
-        movl $tmp_stack, %esp
-
-        call signal_dispatch    # kernel/signal.c
-
-        test %eax, %eax         # do we have signal to handle?
-        jz 1f
-
-        # 更新 tss
-        movl proc_intr_ctx(%ebx), %ecx      # __current->intr_ctx
-        movl %ecx, (tss_esp0_off + _tss)
-
-        jmp handle_signal
-
-    1:
-        movl proc_intr_ctx(%ebx), %eax
-        jmp soft_iret
-
-    .global handle_signal
-    handle_signal:
-        # 注意1：任何对proc_sig的布局改动，都须及时的保证这里的一致性！
-        # 注意2：handle_signal在调用之前，须确保proc_sig已经写入用户栈！
-        # arg1 in %eax: addr of proc_sig structure in user stack
-        movl psig_saved_ictx(%eax), %ebx      # %ebx = &proc_sig->saved_ictx
-
-        pushl $UDATA_SEG
-        pushl %eax              # esp
-
-        movl iexecp(%ebx), %ebx
-        pushl exeflags(%ebx)          # proc_sig->saved_ictx->execp->eflags
-        
-        pushl $UCODE_SEG        # cs
-        pushl psig_sigact(%eax)           # %eip = proc_sig->sigact
-
-        movw $UDATA_SEG, %cx    # switch data seg to user mode
-        movw %cx, %es
-        movw %cx, %ds
-        movw %cx, %fs
-        movw %cx, %gs
-
-        iret
\ No newline at end of file