73 lines
2 KiB
C
73 lines
2 KiB
C
#include "libc/stdio.h"
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#include "boot/multiboot.h"
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#include "core/mem.h"
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#include "core/gdt.h"
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#include "core/paging.h"
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char show_tics=0;
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extern GDT_TSS TSS;
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extern void interrupt_enable();
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void utask(){
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char msg[]="Message from the task :D";
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asm("mov $0x1, %%eax;int $0x30"::"b"(msg));
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while(1);
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}
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void bringelle(){
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clear();
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printc("Booting Bringelle...\n",GREEN);
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// ----- Kernel boot sequence
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interrupt_enable();
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print("Interrupts enabled\n");
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paging_enable();
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print("Paging enable!\n");
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print("Kernel started !");
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show_tics=1;
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// Utask
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print("Launch user task ");
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memcpy((void*)utask,(void*)0x300000, 100); // 100 bytes seems reasonable to load utask
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asm (
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"cli \n\t" // Ensure we do not get interrupted
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"movl %%ss, %%eax \n\t"
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"movl %%eax, %0 \n\t" // Save kernel ss segment into the TSS
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"movl %%esp, %1 \n\t" // Save kernel esp into the TSS BEFORE setting up the stack
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"pushl $0x33 \n\t" // Push task ss which is 0x30 along with prlv which is 0x3
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"pushl $0x30FFFF \n\t" // Push task esp
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"pushfl \n\t" // Retrieve flags
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"popl %%eax \n\t"
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"orl $0x200, %%eax \n\t" // Enable interrupt for the user task
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"and $0xffffbfff, %%eax \n\t" // Clear the NT flags
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"push %%eax \n\t" // Push task flags
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"push $0x23 \n\t" // Push task cs which is 0x20 along with prlv which is 0x3
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"push $0x300000 \n\t" // Push task entry point
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"mov $0x2B, %%eax \n\t" // GDT entry 0x28 along with prlv which is 0x3
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"mov %%eax, %%ds \n\t" // Setting up user data segment
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"iret \n\t" // Launch user task
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: "=m" (TSS.ss0), "=m" (TSS.esp0)
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);
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while(1);
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}
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void clock(){
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static int tic=0;
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static int sec=0;
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tic++;
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if(tic>=20){
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tic=0;
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sec++;
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if(show_tics)
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putchar('.');
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}
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}
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void page_fault(){
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print("Page fault!");
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}
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