vga now working with term and shell program

build_programs.sh

@@ -13,4 +13,4 @@ find "." -type f \( -name "Makefile" -o -name "makefile" \) | while read -r make
     )
 done
 
-cd..
+cd ..

kernel/drivers/vga/vga.c

@@ -30,7 +30,7 @@ uint32_t vga_mmap(vfs_node_t* node, uint32_t address) {
 	for (uint32_t i = 0; i < num_pages; i++) {
 		uint32_t phys_addr = framebuffer_address + (i * 4096);
 		uint32_t virt_addr = address + (i * 4096);
-		map_page(virt_addr, phys_addr, PAGE_PRESENT | PAGE_WRITABLE);
+		map_page(virt_addr, phys_addr, PAGE_PRESENT | PAGE_WRITABLE | PAGE_USER | PAGE_MMIO);
 	}
 	return address;
 }
@@ -70,7 +70,7 @@ void vga_init(
 	for (uint32_t i = 0; i < num_pages; i++) {
 		uint32_t phys_addr = fb_paddr + (i * 4096);
 		uint32_t virt_addr = VGA_FRAMEBUFFER + (i * 4096);
-		map_page(virt_addr, phys_addr, PAGE_PRESENT | PAGE_WRITABLE);
+		map_page(virt_addr, phys_addr, PAGE_PRESENT | PAGE_WRITABLE | PAGE_MMIO);
 	}
 
 	vga_clear_scrn(0x00000000);

kernel/kmain.c

@@ -166,14 +166,7 @@ void kmain(multiboot_info* mbi)  {
   dev->mnt = devfs;
   kprintf("mounted devfs\n");
   
-  int font_loaded = set_console_font("/usr/fonts/kernel_font.psf");
-  if (!font_loaded) {
-    kprintf("failed to load console font\n");
-  }
-  console_init();
-
-  kprintf("kernel console initialized\n");
-  kprintf("basic initializations complete. check serial for details\n");
+  kprintf("basic initializations complete\n");
   kprintf("starting rockos\n");
 
   load_root_program("/usr/bin/rockterm");

kernel/lib/print.c

@@ -16,7 +16,6 @@ static char* hex_chars = "0123456789abcdef";
 
 static void kwrite(char c) {
     write_serial(c);   
-    console_putchar(c);
 }
 
 static void kprint(const char *str) {

kernel/memory/mm.c

@@ -247,7 +247,7 @@ void* clone_current_pd() {
             uint32_t pte_src = pt_src[j];
             if (!(pte_src & PAGE_PRESENT)) continue;
 
-            if (!(pte_src & PAGE_WRITABLE)) {
+            if (!(pte_src & PAGE_WRITABLE) || (pte_src & PAGE_MMIO)) {
                 pt_dst[j] = pt_src[j];
                 continue;
             }

kernel/memory/mm.h

@@ -7,6 +7,7 @@
 #define PAGE_WRITABLE (1 << 1)
 #define PAGE_USER     (1 << 2)
 #define PAGE_COW      (1 << 9)
+#define PAGE_MMIO     (1 << 10)
 
 #define TEMP_KERNPD_VADDR   0xDFF90000
 #define TEMP_TASKPD_VADDR   0xDFFA0000

kernel/scheduler.c

@@ -25,7 +25,14 @@ void unlock_scheduler() {
     enable_interrupts();
 }
 
+typedef struct registers {
+    uint32_t ds;                                       // push %ds
+    uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;   // pushal
+    uint32_t eip, cs, eflags, useresp, ss;             // pushed by cpu
+} __attribute__((packed)) registers_t;
+
 uint32_t switch_context(uint32_t current_esp) {
+    registers_t* regs = (registers_t*)current_esp;
     current_process->esp = current_esp;
 
     process_t* next_process = current_process->sched_next;
@@ -62,8 +69,6 @@ uint32_t switch_context(uint32_t current_esp) {
     if (current_process->flags & PROCESS_FLAG_USER) {
         tss.esp0 = current_process->kstack_top;
     }
-
-    
     
     return current_process->esp;
 }

kernel/syscall.c

@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#include "drivers/serial/serial.h"
 #include "lib/memory.h"
 #include "lib/ringbuf.h"
 
@@ -25,11 +26,12 @@ typedef struct registers {
 
 static int32_t sys_exit(int status) {
     process_t* task = current_task();
-    task->state = STATE_ZOMBIE;
-    task->exit_status = status;
-    if (task->waiting) {
-        wake(task->waiting);
-    }
+    task->state = STATE_DEAD;
+    // task->exit_status = status;
+    // if (task->waiting) {
+    //     wake(task->waiting);
+    // }
+    kprintf("task %d exited with status %d\n", task->pid, status);
     exit();
     return 0;
 }
@@ -212,6 +214,7 @@ static int32_t sys_exec(registers_t* regs, const char* prgm) {
     regs->eip = eip;
     regs->useresp = (uint32_t)u_esp;
 
+    print_serial("returning from exec\n");
     return 0;
 }
 
@@ -253,7 +256,7 @@ static int32_t sys_mmap(int fd) {
 
     if (!(file->node->flags & VFS_CHARDEVICE)) return 0;
 
-    uint32_t map_vaddr = 0x3FF00000;
+    uint32_t map_vaddr = 0x20000000;
     return file->node->mmap(file->node, map_vaddr);
 }
 

programs/rocksh/main.c

@@ -1,7 +1,7 @@
 #include "syscall.h"
 #include <stdlib.h>
 #include <unistd.h>
-#include <stdio.h>
+#include <stdio.h> 
 #include <string.h>
 
 const char* shell_prompt = "rocksh> ";
@@ -11,7 +11,7 @@ size_t buf_offset = 0;
 
 char path[256];
 
-const char* bin_dir = "/bin/";
+const char* bin_dir = "/usr/bin/";
 
 void parse_cmd() {
     if (strcmp(buf, "exit") == 0) {

programs/rockterm/main.c

@@ -1,74 +1,215 @@
 #include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
 
 #include <sys/video.h>
 
 typedef struct {
+    uint8_t magic[2];
+    uint8_t mode;
+    uint8_t charsz;
+} psf_hdr_t;
 
-} font_t;
+typedef struct {
+    int fd;
+    psf_hdr_t hdr;
+    void* glyphs;
+} psf_font_t;
+
+psf_font_t* load_font(const char* path);
+void free_font(psf_font_t* font);
 
 void term_write_char(char c);
-void render_char_at(char c, int x, int y);
+void render_char(char c);
+void clear(uint32_t color);
+void spawn_shell();
 
-int spawn_shell();
+void start_terminal();
 
-int ptys;
-int ptym;
+static int ptys;
+static int ptym;
+static int vga_fd;
 
-void* fb;
-fb_info_t fb_info;
+static void* fb = NULL;
+static fb_info_t fb_info;
 
-int terminal_col = 0;
-int terminal_row = 0;
+static uint32_t console_row = 0;
+static uint32_t console_col = 0;
+static uint32_t console_width = 0;
+static uint32_t console_height = 0;
+static uint32_t console_text_color = 0;
+static uint32_t console_backgrnd_color = 0;
 
-font_t* terminal_font = NULL;
+static int shell_pid;
+
+psf_font_t* terminal_font = NULL;
 
 int main(int argc, char *argv[]) {
     (void)argc;
     (void)argv;
 
-    int vga_fd = open("/dev/vga");
-    if (vga_fd == -1) return 1;
+    ptym = pty(&ptys);
 
-    int kbd_fd = open("/dev/kbd");
-    if (kbd_fd == -1) return 1;
+    vga_fd = open("/dev/vga");
+    if (vga_fd == -1) return 1;
 
     int res = ioctl(vga_fd, FBIOGET_INFO, &fb_info);
     if (!res) {
         return 1;
     }
 
-    mmap(vga_fd);
+    fb = mmap(vga_fd);
 
-    // if (!spawn_shell()) {
-    //     return 1;
-    // }
+    terminal_font = load_font("/usr/fonts/kernel_font.psf");
+    if (!terminal_font) {
+        return 1;
+    }
+
+    console_height = fb_info.height / terminal_font->hdr.charsz;
+    console_width = fb_info.width / 8;
+    console_text_color = 0xFFFFFFFF;
+    console_backgrnd_color = 0xFF6c7482;
+
+    start_terminal();
+
+    free_font(terminal_font);
+    close(vga_fd);
+    close(ptym);
 
     return 0;
 }
 
-void render_char_at(char c, int x, int y) {
+void render_char(char c) {
     if (!terminal_font) return;
+    uint32_t vga_pitch = fb_info.pitch;
+    uint8_t* glyph = (uint8_t*)terminal_font->glyphs + (c * terminal_font->hdr.charsz);
+
+    uint32_t pixel_y_start = console_row * terminal_font->hdr.charsz;
+    uint32_t pixel_x_start = console_col * 8;
+
+    for (uint32_t y = 0; y < terminal_font->hdr.charsz; y++) {
+        uint8_t bits = glyph[y];
+        uint8_t* row_bytes = (uint8_t*)fb + ((pixel_y_start + y) * vga_pitch);
+        uint32_t* pixel_row = (uint32_t*)row_bytes;
+
+        for (int x = 0; x < 8; x++) {
+            if (bits & (0b10000000 >> x)) {
+                pixel_row[pixel_x_start + x] = console_text_color;
+            } else {
+                pixel_row[pixel_x_start + x] = console_backgrnd_color;
+            }
+        }
+    }
 }
 
-void term_write_char(char c) {
-
-}
-
-int spawn_shell() {
-    ptym = pty(&ptys);
-
-    if (fork() == 0) {
+void spawn_shell() {
+    if ((shell_pid = fork()) == 0) {
         close(ptym);
+        close(vga_fd);
+
         dup2(ptys, 0);
         dup2(0, 1);
         dup2(0, 2);
-
-        if (!exec("/usr/bin/rocksh")) return 0;
+        if (!exec("/usr/bin/rocksh")) exit(1);
     }
 
     close(ptys);
     dup2(ptym, 0);
     dup2(0, 1);
     dup2(0, 2);
-    return 1;
+}
+
+void clear(uint32_t color) {
+    for (uint32_t i = 0; i < fb_info.fb_size; i++) {
+        ((uint32_t*)fb)[i] = color;
+    }
+}
+
+psf_font_t* load_font(const char* path) {
+    int fd = open(path);
+    if (fd == -1) {
+        return NULL;
+    }
+
+    psf_hdr_t header;
+    int rd = read(fd, &header, sizeof(psf_hdr_t));
+    if (rd <= 0) {
+        return NULL;
+    }
+
+    uint32_t num_glyphs = (header.mode & (1 << 0)) ? 512 : 256;
+    uint32_t glyph_sz = header.charsz;
+    size_t glyph_buf_sz = num_glyphs * glyph_sz;
+
+    void* glyphs = malloc(glyph_buf_sz);
+
+    rd = 0;
+    rd = read(fd, glyphs, glyph_buf_sz);
+    if (rd <= 0) {
+        free(glyphs);
+        return NULL;
+    }
+
+    psf_font_t* font = (psf_font_t*)malloc(sizeof(psf_font_t));
+    font->fd = fd;
+    font->hdr = header;
+    font->glyphs = glyphs;
+    return font;
+}
+
+void free_font(psf_font_t* font) {
+    close(font->fd);
+    free(font->glyphs);
+    free(font);
+}
+
+void term_write_char(char c) {
+    if (!terminal_font) return;
+
+    if (c == '\n') {
+        console_col = 0;
+        console_row++;
+        if (console_row >= console_height) {
+            console_row = 0;
+        }
+        return;
+    }
+    
+    render_char(c);
+    
+    console_col++;
+    if (console_col >= console_width) {
+        console_col = 0;
+        console_row++;
+    }
+
+    if (console_row >= console_height) {
+        console_row = 0;
+    }
+}
+
+void start_terminal() {
+    spawn_shell();
+
+    clear(console_backgrnd_color);
+    
+    int kbd_fd = open("/dev/kbd"); 
+    if (kbd_fd == -1) return;
+
+    while (1) {
+        char c;
+        int rd = read(STDIN_FILENO, &c, 1);
+        if (rd > 0) {
+            term_write_char(c);
+            continue;
+        }
+        
+        rd = 0;
+        c = 0;
+        rd = read(kbd_fd, &c, 1);
+        if (rd > 0) {
+            write(STDOUT_FILENO, &c, 1);
+        }
+    }
 }

rlibc/include/stdlib.h

@@ -4,5 +4,6 @@
 #include <stddef.h>
 
 void* malloc(size_t size);
+void free(void* ptr);
 
 #endif