Nevar pievienot vairāk kā 25 tēmas
Tēmai ir jāsākas ar burtu vai ciparu, tā var saturēt domu zīmes ('-') un var būt līdz 35 simboliem gara.
104 rindas
2.4 KiB
104 rindas
2.4 KiB
#include <defs.h>
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#include <stdio.h>
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#include <string.h>
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#include <console.h>
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#include <kdebug.h>
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#include <picirq.h>
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#include <trap.h>
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#include <clock.h>
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#include <intr.h>
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#include <pmm.h>
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int kern_init(void) __attribute__((noreturn));
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static void lab1_switch_test(void);
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int
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kern_init(void) {
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extern char edata[], end[];
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memset(edata, 0, end - edata);
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cons_init(); // init the console
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const char *message = "(THU.CST) os is loading ...";
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cprintf("%s\n\n", message);
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print_kerninfo();
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grade_backtrace();
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pmm_init(); // init physical memory management
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pic_init(); // init interrupt controller
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idt_init(); // init interrupt descriptor table
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clock_init(); // init clock interrupt
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intr_enable(); // enable irq interrupt
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//LAB1: CAHLLENGE 1 If you try to do it, uncomment lab1_switch_test()
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// user/kernel mode switch test
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//lab1_switch_test();
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/* do nothing */
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while (1);
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}
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void __attribute__((noinline))
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grade_backtrace2(int arg0, int arg1, int arg2, int arg3) {
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mon_backtrace(0, NULL, NULL);
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}
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void __attribute__((noinline))
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grade_backtrace1(int arg0, int arg1) {
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grade_backtrace2(arg0, (int)&arg0, arg1, (int)&arg1);
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}
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void __attribute__((noinline))
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grade_backtrace0(int arg0, int arg1, int arg2) {
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grade_backtrace1(arg0, arg2);
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}
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void
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grade_backtrace(void) {
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grade_backtrace0(0, (int)kern_init, 0xffff0000);
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}
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static void
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lab1_print_cur_status(void) {
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static int round = 0;
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uint16_t reg1, reg2, reg3, reg4;
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asm volatile (
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"mov %%cs, %0;"
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"mov %%ds, %1;"
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"mov %%es, %2;"
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"mov %%ss, %3;"
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: "=m"(reg1), "=m"(reg2), "=m"(reg3), "=m"(reg4));
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cprintf("%d: @ring %d\n", round, reg1 & 3);
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cprintf("%d: cs = %x\n", round, reg1);
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cprintf("%d: ds = %x\n", round, reg2);
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cprintf("%d: es = %x\n", round, reg3);
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cprintf("%d: ss = %x\n", round, reg4);
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round ++;
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}
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static void
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lab1_switch_to_user(void) {
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//LAB1 CHALLENGE 1 : TODO
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}
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static void
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lab1_switch_to_kernel(void) {
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//LAB1 CHALLENGE 1 : TODO
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}
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static void
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lab1_switch_test(void) {
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lab1_print_cur_status();
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cprintf("+++ switch to user mode +++\n");
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lab1_switch_to_user();
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lab1_print_cur_status();
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cprintf("+++ switch to kernel mode +++\n");
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lab1_switch_to_kernel();
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lab1_print_cur_status();
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}
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