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main.c
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main.c
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#include "multiboot.h"
#include "monitor.h"
#include "gdt-idt.h"
#include "timer.h"
#include "kheap.h"
#include "paging.h"
#include "fs.h"
#include "task.h"
#include "syscall.h"
extern u32int end;
extern u32int placement_address;
extern heap_t *kheap;
extern fs_node_t *initrd_root;
extern fs_node_t *initrd_dev;
extern fs_node_t *root_nodes;
extern isr_t interrupt_handlers[];
u32int initial_esp;
int main(struct multiboot *mboot_ptr, u32int initial_stack)
{
initial_esp = initial_stack;
init_gdt();
init_idt();
memset(&interrupt_handlers, 0, sizeof(isr_t)*256);
monitor_clear();
monitor_write("init gdt idt ok\n");
break_point();
monitor_write("init timer\n");
asm volatile("sti");
init_timer(50); // 50Hz
break_point();
monitor_write("kernel end at ");
monitor_write_hex((u32int)&end);
monitor_put('\n');
monitor_write("main stack start ");
monitor_write_hex(initial_esp);
monitor_put('\n');
break_point();
ASSERT(mboot_ptr->mods_count > 0);
u32int initrd_location = mboot_ptr->mods_addr[0];
u32int initrd_end = mboot_ptr->mods_addr[1];
placement_address = initrd_end;
monitor_write("initrd: ");
monitor_write_hex(initrd_location);
monitor_write(" ~ ");
monitor_write_hex(initrd_end);
monitor_write(", size ");
monitor_write_dec(initrd_end - initrd_location);
monitor_put('\n');
print_placement_address();
break_point();
init_paging();
init_tasking();
monitor_write("init initrd\n");
init_initrd(initrd_location);
monitor_write("initrd_root at ");
monitor_write_hex((u32int)initrd_root);
monitor_put('\n');
monitor_write("initrd_dev at ");
monitor_write_hex((u32int)initrd_dev);
monitor_put('\n');
monitor_write("root_nodes at ");
monitor_write_hex((u32int)root_nodes);
monitor_put('\n');
print_heap(kheap);
break_point();
monitor_write("init syscalls\n");
init_syscalls();
break_point();
switch_to_user_mode();
syscall_monitor_write("Hello, user world!\n");
break_point();
syscall_monitor_write_hex(0x123456);
syscall_monitor_write("\n");
break_point();
syscall_monitor_write_dec(123456);
syscall_monitor_write("\n");
break_point();
user_mode_can_read_but_cannot_write();
return 0;
}