loic/bringelle
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This commit is contained in:
Loic Guegan 2021-04-11 20:53:06 +02:00
parent 3212145e94
commit 6edeba8fe2
12 changed files with 81 additions and 19 deletions
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21
src/bringelle.c
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@ -1,8 +1,10 @@
#include "libc/stdio.h"
#include "utils/pic.h"
#include "int/pic.h"
#include "boot/multiboot.h"
#include "utils/mem.h"
#include "utils/gdt.h"
#include "utils/paging.h"
char show_tics=0;
@ -21,11 +23,14 @@ void bringelle(){
// Kernel boot sequence
pic_enable_interrupt();
print("Interrupts enabled\n");
print("Kernel started !\n");
paging_enable();
print("Paging enable!\n");
print("Kernel started !");
show_tics=1;
// Utask
print("Launch user task ");
show_tics=1;
memcpy((void*)utask,(void*)0x300000, 100); // 100 bytes seems reasonable to load utask
asm (
"cli \n\t" // Ensure we do not get interrupted
@ -33,20 +38,22 @@ void bringelle(){
"movl %%eax, %0 \n\t" // Save kernel ss segment into the TSS
"movl %%esp, %1 \n\t" // Save kernel esp into the TSS BEFORE setting up the stack
"pushl $0x33 \n\t" // Push task ss which is 0x30 along with prlv which is 0x3
"pushl $0x400000 \n\t" // Push task esp
"pushl $0x30FFFF \n\t" // Push task esp
"pushfl \n\t" // Retrieve flags
"popl %%eax \n\t"
"orl $0x200, %%eax \n\t" // Enable interrupt for the user task
"and $0xffffbfff, %%eax \n\t" // Clear the NT flags
"push %%eax \n\t" // Push task flags
"push $0x23 \n\t" // Push task cs which is 0x20 along with prlv which is 0x3
"push $0 \n\t" // Push task entry point
"push $0x300000 \n\t" // Push task entry point
"mov $0x2B, %%eax \n\t" // GDT entry 0x28 along with prlv which is 0x3
"mov %%eax, %%ds \n\t" // Setting up user data segment
"iret \n\t" // Launch user task
: "=m" (TSS.ss0), "=m" (TSS.esp0)
);
while(1);
}
@ -63,3 +70,7 @@ void clock(){
}
void page_fault(){
print("Page fault!");
}