Merge pull request 'kbd_fix' (#12) from kbd_fix into main

Reviewed-on: #12

README.md

@@ -41,8 +41,10 @@ PepperOS wouldn't be possible without the following freely-licensed software:
 
 - the [Limine](https://codeberg.org/Limine/Limine) portable bootloader
 - Marco Paland's freestanding [printf implementation](https://github.com/mpaland)
-- the [ZAP](https://www.zap.org.au/projects/console-fonts-zap/) PSF console fonts
+- Mintuski's [Flanterm](https://codeberg.org/Mintsuki/Flanterm) terminal emulator
 
 ...and without these amazing resources:
 
 - the [OSDev](https://osdev.org) wiki & forums
+- Intel 64 and IA-32 Architectures Software Developer's Manual
+- Documentation for the [GNU Compiler Collection](https://gcc.gnu.org/onlinedocs/gcc/)

src/idt/idt.S

@@ -151,12 +151,13 @@ vector_7_handler:
 align 16
 vector_8_handler:
     ; No error code, we only push vector number
-    push qword 1
+    push qword 8
     jmp interrupt_stub
 
 ; Coprocessor Segment Overrun
 align 16
 vector_9_handler:
+    push qword 0
     push qword 9
     jmp interrupt_stub
 

src/idt/idt.c

@@ -22,7 +22,7 @@ struct idtr idt_reg;
 extern char vector_0_handler[];
 
 // Timer ticks
-extern uint64_t ticks;
+extern volatile uint64_t ticks;
 
 void idt_set_entry(uint8_t vector, void* handler, uint8_t dpl)
 {
@@ -52,9 +52,8 @@ void idt_load(void* idt_addr)
 
 void idt_init()
 {
-    // We set 256 entries, but we have only the first few stubs.
-    // Undefined behavior?
-    for (size_t i=0; i<256; i++)
+    // Hardcoded...
+    for (size_t i=0; i<=33; i++)
     {
         // Each vector handler is 16-byte aligned, so <vector_no>*16 = address of that handler
         idt_set_entry(i, vector_0_handler + (i*16), 0);
@@ -210,6 +209,7 @@ struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
         case 33:
             DEBUG("Keyboard Interrupt");
             keyboard_handler();
+            outb(0x20, 0x20);
             break;
 
         default:

src/io/kbd/ps2.c

@@ -17,6 +17,8 @@ uint8_t key_status = 0b00000000;
 unsigned char* keymap;
 unsigned char* keymap_shifted;
 
+extern struct init_status init;
+
 unsigned char kbdus[128] =
 {
     0,  27, '1', '2', '3', '4', '5', '6', '7', '8',	/* 9 */
@@ -176,9 +178,6 @@ void keyboard_handler()
                 key_status &= ~ALT_PRESSED_BIT;
                 break;
         }
-
-        // Send EOI
-        outb(0x20, 0x20);
         return;
     }
     else
@@ -199,21 +198,26 @@ void keyboard_handler()
                 break;
 
             default:
+            {
+                // Avoiding buffer overflow from extended keys lol
+                if (scancode < 128)
                 {
                     // Should we get a SHIFTED char or a regular one?
                     unsigned char c = (key_status & SHIFT_PRESSED_BIT) ? keymap_shifted[scancode] : keymap[scancode];
 
                     if (c)
                     {
+                        if (c == '\n')
+                        {
+                            _putchar('\r');
+                        }
                         // Should probably have a keyboard buffer here... instead of this
                         _putchar(c);
                     }
                 }
             }
         }
-
-    // End of Interrupt (to master PIC)
-    outb(0x20, 0x20);
+    }
 }
 
 void keyboard_init(unsigned char layout)
@@ -233,14 +237,21 @@ void keyboard_init(unsigned char layout)
             break;
         
         default:
-            skputs("Unsupported layout.");
+            panic(NULL, "Unsupported keyboard layout");
             return;
     }
 
+    // Flush keyboard buffer
+    while (inb(0x64) & 1)
+    {
+        inb(0x60);
+    }
+
     // Unmask IRQ1
     uint8_t mask = inb(0x21);
     mask &= ~(1 << 1);
     outb(0x21, mask);
 
     DEBUG("PS/2 Keyboard initialized");
+    init.keyboard = true;
 }

src/io/serial/serial.c

@@ -7,6 +7,8 @@
 #include <kernel.h>
 #include "serial.h"
 
+extern struct init_status init;
+
 void outb(int port, unsigned char data)
 {
     __asm__ __volatile__("outb %%al, %%dx" :: "a" (data),"d" (port));
@@ -43,6 +45,7 @@ int serial_init()
     outb(PORT + 4, 0x0F);
 
     DEBUG("*** Welcome to PepperOS! ***");
+    init.serial = true;
     return 0;
 }
 
@@ -54,6 +57,7 @@ static int is_transmit_empty()
 // Serial kernel putchar
 void skputc(char c)
 {
+    // TODO: Spinlock here (serial access)
     while (!is_transmit_empty()); // wait for free spot
     outb(PORT, c);
 }

src/io/term/term.c

@@ -16,12 +16,17 @@ because this shitty implementation will be replaced one day by Flanterm
 #include "term.h"
 #include "config.h"
 #include "flanterm.h"
+#include "flanterm_backends/fb.h"
+#include "mem/heap/kheap.h"
+#include "limine.h"
 
 extern struct flanterm_context* ft_ctx;
+extern struct init_status init;
 
 // Overhead that could be avoided, right? (for printf)
 void _putchar(char character)
 {
+	// TODO: Spinlock here (terminal access)
 	flanterm_write(ft_ctx, &character, 1);
 }
 
@@ -36,3 +41,34 @@ void kputs(const char* str)
 	}
 	_putchar('\r');
 }
+
+extern struct flanterm_context* ft_ctx;
+extern struct boot_context boot_ctx;
+
+void flanterm_free_wrapper(void* ptr, size_t size)
+{
+	(void)size;
+	kfree(ptr);
+}
+
+void term_init()
+{
+	uint32_t bgColor = 0x252525;
+	ft_ctx = flanterm_fb_init(
+        kmalloc,
+        flanterm_free_wrapper,
+        boot_ctx.fb->address, boot_ctx.fb->width, boot_ctx.fb->height, boot_ctx.fb->pitch,
+        boot_ctx.fb->red_mask_size, boot_ctx.fb->red_mask_shift,
+        boot_ctx.fb->green_mask_size, boot_ctx.fb->green_mask_shift,
+        boot_ctx.fb->blue_mask_size, boot_ctx.fb->blue_mask_shift,
+        NULL,
+        NULL, NULL,
+        &bgColor, NULL,
+        NULL, NULL,
+        NULL, 0, 0, 1,
+        0, 0,
+        0,
+        0
+    );
+	init.terminal = true;
+}

src/io/term/term.h

@@ -9,5 +9,6 @@
 
 void kputs(const char* str);
 void _putchar(char character);
+void term_init();
 
 #endif

src/kernel.h

@@ -19,9 +19,11 @@ enum ErrorCodes
 #include "io/serial/serial.h"
 #include "io/term/printf.h"
 #include "idt/idt.h"
+#include <stdbool.h>
 
-#define DEBUG(log, ...) fctprintf((void*)&skputc, 0, "debug: [%s]: " log "\r\n", __FILE__, ##__VA_ARGS__)
+extern volatile uint64_t ticks;
 
+#define DEBUG(log, ...) fctprintf((void*)&skputc, 0, "[%8u] debug: <%s>: " log "\r\n", ticks, __func__, ##__VA_ARGS__)
 
 /* #define DEBUG(log, ...) \
 	printf("debug: [%s]: " log "\r\n", __FILE__, ##__VA_ARGS__); \
@@ -38,6 +40,7 @@ void panic(struct cpu_status_t* ctx, const char* str);
 void hcf();
 void idle();
 
+/* debug */
 void debug_stack_trace(unsigned int max_frames);
 const char* debug_find_symbol(uintptr_t rip, uintptr_t* offset);
 void boot_mem_display();
@@ -52,4 +55,13 @@ struct boot_context
 	struct limine_kernel_address_response* kaddr;
 };
 
+// Are these modules initialized yet?
+struct init_status
+{
+	bool terminal;
+	bool serial;
+	bool keyboard;
+	bool timer;
+};
+
 #endif

src/kmain.c

@@ -30,8 +30,6 @@
 __attribute__((used, section(".limine_requests")))
 volatile LIMINE_BASE_REVISION(3);
 
-struct flanterm_context *ft_ctx;
-
 // Halt and catch fire (makes machine stall)
 void hcf()
 {
@@ -41,9 +39,9 @@ void hcf()
 // Doing nothing (can be interrupted)
 void idle() {SET_INTERRUPTS; for(;;)asm("hlt");}
 
-// uint8_t kernel_stack[KERNEL_STACK_SIZE] __attribute__((aligned(16)));
-
+struct flanterm_context *ft_ctx;
 struct boot_context boot_ctx;
+struct init_status init = {0};
 
 extern volatile struct limine_framebuffer_request framebuffer_request;
 extern volatile struct limine_memmap_request memmap_request;
@@ -52,22 +50,24 @@ extern volatile struct limine_kernel_address_request kerneladdr_request;
 
 extern struct process_t* processes_list;
 extern struct process_t* current_process;
+struct process_t* idle_proc;
 
+bool iran = false;
+
+// Never gets executed although pedicel is scheduled?
 void pedicel_main(void* arg)
 {
+	bool iran = true;
 	// FROM THE NEXT LINE ONWARDS, CANNOT WRITE TO FRAMEBUFFER WITHOUT PAGE FAULT!
 	//printf("\n\nWelcome to PepperOS! Pedicel speaking.\nNothing left to do, halting the system!");
 }
 
 void idle_main(void* arg)
 {
-	for(;;)asm("hlt");
-}
-
-void flanterm_free_wrapper(void* ptr, size_t size)
+	for (;;)
 	{
-	(void)size;
-	kfree(ptr);
+		asm("hlt");
+	}
 }
 
 extern uintptr_t kheap_start;
@@ -79,6 +79,7 @@ void kmain()
 	if (!LIMINE_BASE_REVISION_SUPPORTED) hcf();
 
 	serial_init();
+	timer_init();
 
 	// Populate boot context
  	boot_ctx.fb = framebuffer_request.response ? framebuffer_request.response->framebuffers[0] : NULL;
@@ -95,41 +96,19 @@ void kmain()
 
 	keyboard_init(FR);
 
-	uint32_t bgColor = 0x252525;
-	ft_ctx = flanterm_fb_init(
-        kmalloc,
-        flanterm_free_wrapper,
-        boot_ctx.fb->address, boot_ctx.fb->width, boot_ctx.fb->height, boot_ctx.fb->pitch,
-        boot_ctx.fb->red_mask_size, boot_ctx.fb->red_mask_shift,
-        boot_ctx.fb->green_mask_size, boot_ctx.fb->green_mask_shift,
-        boot_ctx.fb->blue_mask_size, boot_ctx.fb->blue_mask_shift,
-        NULL,
-        NULL, NULL,
-        &bgColor, NULL, // &bgColor
-        NULL, NULL,
-        NULL, 0, 0, 1,
-        0, 0,
-        0,
-        0
-    );
+	term_init();
 
 	gdt_init();
 	idt_init();
 	
-	timer_init();
-	vmm_init();
-	
 	process_init();
-	struct process_t* idle_proc = process_create("idle", (void*)idle_main, 0);
+	idle_proc = process_create("idle", (void*)idle_main, 0);
 	struct process_t* pedicel = process_create("pedicel", (void*)pedicel_main, 0);
 
 	process_display_list(processes_list);
 
 	scheduler_init();
 
-	current_process = idle_proc; 
-    current_process->status = RUNNING;
-
 	kputs(PEPPEROS_SPLASH);
 	idle();
 }

src/sched/process.c

@@ -45,7 +45,7 @@ void process_display_list(struct process_t* processes_list)
 
 struct process_t* process_create(char* name, void(*function)(void*), void* arg)
 {
-/*     CLEAR_INTERRUPTS; */
+    CLEAR_INTERRUPTS;
     struct process_t* proc = (struct process_t*)kmalloc(sizeof(struct process_t));
     
     struct cpu_status_t* ctx = (struct cpu_status_t*)kmalloc(sizeof(struct cpu_status_t));
@@ -79,7 +79,7 @@ struct process_t* process_create(char* name, void(*function)(void*), void* arg)
 
     process_add(&processes_list, proc);
 
-/*     SET_INTERRUPTS; */
+    SET_INTERRUPTS;
     return proc;
 }
 

src/sched/scheduler.c

@@ -12,6 +12,7 @@
 
 extern struct process_t* processes_list;
 extern struct process_t* current_process;
+extern struct process_t* idle_proc;
 
 void scheduler_init()
 {
@@ -28,9 +29,8 @@ struct cpu_status_t* scheduler_schedule(struct cpu_status_t* context)
 
     if (current_process == NULL)
     {
-        // Wtf happened
-        current_process = processes_list;
-        //panic(NULL, "Scheduler called without current process");
+        // If no more processes, then set IDLE as the current process, that's it.
+        current_process = idle_proc;
     }
 
     current_process->context = context;
@@ -49,6 +49,8 @@ struct cpu_status_t* scheduler_schedule(struct cpu_status_t* context)
         if (current_process != NULL && current_process->status == DEAD)
         {
             process_delete(&prev_process, current_process);
+            current_process = NULL;
+            return idle_proc->context;
         } else
         {
             current_process->status = RUNNING;
@@ -56,8 +58,6 @@ struct cpu_status_t* scheduler_schedule(struct cpu_status_t* context)
         }
     }
 
-
-    // Current_process gets wrong context?? (iret_rip points to other stuff than process function; like putpixel() for example)
     DEBUG("current_process={pid=%u, name='%s', root_page_table[virt]=%p}", current_process->pid, current_process->name, current_process->root_page_table);
 
     load_cr3(VIRT_TO_PHYS((uint64_t)current_process->root_page_table));

src/time/timer.c

@@ -18,6 +18,8 @@ interested in multi-core functionnality like SMP)
 
 volatile uint64_t ticks = 0;
 
+extern struct init_status init;
+
 void pic_remap()
 {
     uint8_t master_mask = inb(0x21);
@@ -91,4 +93,5 @@ void timer_init()
     pic_enable();
     pit_init();
     DEBUG("PIT initialized");
+    init.timer = true;
 }