82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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start.c
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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Forrest Yu, 2005
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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#include "stdio.h"
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#include "protect.h"
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#include "proc.h"
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#include "global.h"
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#include "proto.h"
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#include "assert.h"
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#include "string.h"
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/*
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* 当发生不可挽回的错误时就打印错误信息并使CPU核休眠
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*/
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void
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_panic(const char *file, int line, const char *fmt,...)
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{
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va_list ap;
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// 确保CPU核不受外界中断的影响
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asm volatile("cli");
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asm volatile("cld");
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va_start(ap, fmt);
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kprintf("kernel panic at %s:%d: ", file, line);
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vkprintf(fmt, ap);
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kprintf("\n");
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va_end(ap);
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// 休眠CPU核，直接罢工
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while(1)
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asm volatile("hlt");
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}
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/*
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* 很像panic，但是不会休眠CPU核，就是正常打印信息
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*/
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void
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_warn(const char *file, int line, const char *fmt,...)
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{
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va_list ap;
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va_start(ap, fmt);
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kprintf("kernel warning at %s:%d: ", file, line);
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vkprintf(fmt, ap);
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kprintf("\n");
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va_end(ap);
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}
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/*======================================================================*
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cstart
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*======================================================================*/
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void cstart()
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{
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kprintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n-----\"cstart\" begins-----\n");
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// 将 LOADER 中的 GDT 复制到新的 GDT 中
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memcpy( &gdt, // New GDT
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(void*)(*((u32*)(&gdt_ptr[2]))), // Base of Old GDT
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*((u16*)(&gdt_ptr[0])) + 1 // Limit of Old GDT
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);
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// gdt_ptr[6] 共 6 个字节：0~15:Limit 16~47:Base。用作 sgdt 以及 lgdt 的参数。
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u16* p_gdt_limit = (u16*)(&gdt_ptr[0]);
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u32* p_gdt_base = (u32*)(&gdt_ptr[2]);
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*p_gdt_limit = GDT_SIZE * sizeof(DESCRIPTOR) - 1;
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*p_gdt_base = (u32)&gdt;
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// idt_ptr[6] 共 6 个字节：0~15:Limit 16~47:Base。用作 sidt 以及 lidt 的参数。
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u16* p_idt_limit = (u16*)(&idt_ptr[0]);
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u32* p_idt_base = (u32*)(&idt_ptr[2]);
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*p_idt_limit = IDT_SIZE * sizeof(GATE) - 1;
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*p_idt_base = (u32)&idt;
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init_prot();
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kprintf("-----\"cstart\" finished-----\n");
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} |