.vscode/settings.json

@@ -12,6 +12,9 @@
 
     "C_Cpp.default.includePath": ["src/kernel/include", "sysroot/usr/include"],
     "C_Cpp.default.cStandard": "c17",
+    "files.associations": {
+        "cpu.h": "c"
+    },
     "[c]": {
         "editor.tabSize": 2,
     },

Makefile

@@ -27,7 +27,7 @@ endif
 
 musllib: $(SYSROOT)/usr/lib/libc.a
 $(SYSROOT)/usr/lib/libc.a:
-	$(BUILDROOT)/toolchain/ports/musl/build.sh
+	${BUILDROOT}/toolchain/build-musl.sh
 
 libmittos: $(SYSROOT)/usr/lib/libmittos.a
 $(SYSROOT)/usr/lib/libmittos.a: FORCE
@@ -46,7 +46,4 @@ distclean:
 	$(MAKE) clean
 	rm -rf $(SYSROOT)
 
-love: FORCE
-	@echo Not war?
-
 .PHONY: all dist sysroot FORCE

documentation/6 - apic.md

@@ -2,7 +2,6 @@
 
 > - [PIC data sheet](http://pdos.csail.mit.edu/6.828/2005/readings/hardware/8259A.pdf)
 > - [IOAPIC data sheet](http://web.archive.org/web/20161130153145/http://download.intel.com/design/chipsets/datashts/29056601.pdf)
-
 The Advanced Programmable Interrupt Controller (APIC) is not to be confused with (ACPI).
 
 It's quite literally an upgrade to the legacy PIC and handles hardware interrupts and IRQs.

src/kernel/Link.ld

@@ -1,7 +1,7 @@
 ENTRY(_start)
 
 KERNEL_OFFSET = 0xFFFFFF8000000000;
-KERNEL_START = 0x100000;
+KERNEL_START = 0x10000;
 
 SECTIONS
 {
@@ -10,20 +10,20 @@ SECTIONS
     .text : AT(ADDR(.text) - KERNEL_OFFSET)
     {
         *(.multiboot)
-        *(.text*)
+        *(.text)
     }
     .rodata : AT(ADDR(.rodata) - KERNEL_OFFSET)
     {
         *(.rodata*)
     }
-    .data ALIGN(0x1000) : AT(ADDR(.data) - KERNEL_OFFSET)
+    .data : AT(ADDR(.data) - KERNEL_OFFSET)
     {
-        *(.data*)
+        *(.data)
     }
     .bss : AT(ADDR(.bss) - KERNEL_OFFSET)
     {
         *(.COMMON)
-        *(.bss*)
+        *(.bss)
     }
     kernel_end = .;
 }

src/kernel/boot/TEMP-test_scheduler.c

@@ -3,7 +3,6 @@
 #include <mittos/graphics.h>
 #include <memory.h>
 #include <cpu.h>
-#include <math.h>
 
 extern gfx_context *term_fb;
 extern gfx_context kernel_fb;
@@ -12,10 +11,8 @@ int *position = (void *)0x20000;
 
 void thread1() {
   int a = 1;
-  double prev = 0;
   gfx_context *ctx =
       framebuffer_make_subcontext(&kernel_fb, 700, 300, 100, 100);
-  __asm__("sti");
   while(1) {
     putCharacter(term_fb,
         *position, *position,
@@ -23,19 +20,14 @@ void thread1() {
         '0'+(a++%10)
     );
     int s = (current_cpu->timer_ticks/1000)%10;
-    double cur = (double)(current_cpu->timer_ticks/100);
     putCharacter(term_fb,
         0, 0,
         RGB(255,255,0), RGB(0,0,0),
         '0'+(s%10)
     );
     flip(term_fb);
-
-    double angle = cur/3.14*2;
-
-    draw_line(ctx, 50, 50 + (int)(50*cos(prev)), 50, 50 + (int)(50*sin(prev)), RGB(0,0,0));
-    draw_line(ctx, 50, 50 + (int)(50*cos(angle)), 50, 50 + (int)(50*sin(angle)), RGB(255,0,0));
-    prev = angle;
+    draw_line(ctx, 0, 100, 50, ((a-1)%100), RGB(0,0,0));
+    draw_line(ctx, 0, 100, 50, (a%100), RGB(255,0,0));
     flip(ctx);
     sched_yield();
   }
@@ -43,17 +35,7 @@ void thread1() {
 
 void thread2() {
   int a = 0;
-  gfx_context *ctx =
-      framebuffer_make_subcontext(&kernel_fb, 800, 400, 100, 100);
-  __asm__("sti");
   while(1) {
-    double pos = (double)(current_cpu->timer_ticks/100);
-    fill_rect(ctx, 0, 0, 100, 100, 0);
-    for(int i = 0; i < 10000; i++) {
-      putpixel(ctx, i/100, 50 + (int)(50.0*sin(pos + ((double)i)/1000.0)), RGB(0,0,255));
-      putpixel(ctx, i/100, 50 + (int)(50.0*cos(pos + ((double)i)/1000.0)), RGB(255,0,0));
-    }
-    flip(ctx);
     putCharacter(term_fb,
         *position, *position,
         RGB(0,255,255), RGB(0,0,0),

src/kernel/boot/kmain.c

@@ -41,6 +41,8 @@ void kmain(uint64_t multiboot_magic, void *multiboot_data) {
 
   cpu_init();
 
+  __asm__("sti");
+
   debug_info("Boot complete\n");
 
 
@@ -48,7 +50,6 @@ void kmain(uint64_t multiboot_magic, void *multiboot_data) {
   irq_unmask(IRQ_PS2_KBD);
   TEMP_test_scheduler();
 
-  __asm__("sti");
 
   start_scheduler();
 

src/kernel/cpu/cpu.c

@@ -27,5 +27,4 @@ void cpu_init() {
   apic_init();
   ioapic_init();
   timer_init();
-  sse_init();
 }

src/kernel/cpu/sse.S

@@ -1,30 +0,0 @@
-.intel_syntax noprefix
-
-.global sse_init
-sse_init:
-  //; Enable bits 9 and 10 in cr4
-  //; 9: Enable SSE instructions
-  //; 10: Enable SSE exceptions
-  mov rax, cr4
-  or rax, 1<<9 | 1<<10
-  mov cr4, rax
-
-  //; Set bit 1 and unset bit 2 in cr0
-  //; 1: Coprocessor monitoring
-  //; 2: Coprocessor emulation
-  mov rax, cr0
-  or rax, 1<<1
-  and rax, ~(1<<2)
-  mov cr0, rax
-
-  ret
-
-.global sse_save
-sse_save:
-  fxsave [rdi]
-  ret
-
-.global sse_restore
-sse_restore:
-  fxrstor [rdi]
-  ret

src/kernel/cpu/timer.c

@@ -69,7 +69,6 @@ volatile int ctr = 0;
 registers *apic_timer_handler(registers *r) {
   current_cpu->timer_ticks++;
   irq_ack();
-  // k_sched_yield();
   return r;
 }
 

src/kernel/include/cpu.h

@@ -98,9 +98,4 @@ void irq_unmask(int irq);
 void ioapic_init();
 
 // cpu/timer.c
-void timer_init();
-
-// cpu/sse.S
-void sse_init();
-void sse_save(void *addr);
-void sse_restore(void *addr);
+void timer_init();

src/kernel/include/proc.h

@@ -7,7 +7,6 @@ struct process {
   uint64_t state;
   uint64_t P4;
   struct process *q_next;
-  void *sse;
   uint8_t stack[];
 };
 

src/kernel/memory/kbrk.c

@@ -1,7 +1,5 @@
 #include <memory.h>
 #include <debug.h>
-#include <sys/mman.h>
-#include <string.h>
 
 static long _brk = KERNEL_BRK0;
 static long _mmap = KERNEL_MMAP;
@@ -35,22 +33,14 @@ long k_mmap(
 
   if(fd != -1)
     PANIC("Unknown mmap request\n");
-  long pos = (flags & MAP_FIXED) ? addr : _mmap;
-  long retval = pos;
-  uint64_t p;
-  while(length >= 0) {
-    p = pmm_alloc();
+  long retval = _mmap;
+  while(length > 0) {
     vmm_set_page(kernel_P4,
-        pos, p,
+        _mmap, pmm_alloc(),
         PAGE_GLOBAL | PAGE_WRITE | PAGE_PRESENT
     );
-    if(flags & MAP_ANONYMOUS) {
-      memset((void *)pos, 0, PAGE_SIZE);
-    }
-    pos += PAGE_SIZE;
+    _mmap += PAGE_SIZE;
     length -= PAGE_SIZE;
   }
-  if(!(flags & MAP_FIXED))
-    _mmap = pos;
   return retval;
 }

src/kernel/proc/process.c

@@ -1,7 +1,6 @@
 #include <stdint.h>
 #include <proc.h>
 #include <memory.h>
-#include <stdlib.h>
 
 struct swtch_stack {
   uint64_t RBP;
@@ -25,10 +24,6 @@ struct process *new_process(void (*function)(void)) {
   p->q_next = 0;
   p->P4 = new_P4();
 
-  // Storage for SSE registers must be 16 byte aligned
-  void *sse = malloc(512+15);
-  p->sse = (void *) (((uintptr_t)sse + 15) & ~0xF);
-
   struct swtch_stack *stck = p->stack_ptr;
   stck->RBP = (uint64_t)&stck->RBP2;
   stck->ret = (uint64_t)function;

src/kernel/proc/scheduler.c

@@ -32,11 +32,8 @@ void scheduler() {
 
     current_proc = new;
     write_cr3(new->P4);
-    sse_restore(current_proc->sse);
-
     switch_stack(&scheduler_proc->stack_ptr, &new->stack_ptr);
 
-    sse_save(current_proc->sse);
     scheduler_insert(current_proc);
     current_proc = 0;
   }

src/libmittos/Makefile

@@ -19,7 +19,7 @@ libmittos.a: $(OBJ)
 
 graphics/graphics.o: graphics/u_vga16.termfont.inc
 graphics/u_vga16.termfont.inc:
-	${BUILDROOT}/toolchain/ports/uni_vga/build.sh
+	${BUILDROOT}/toolchain/build-uni_vga.sh
 
 # Automatic dependency tracking
 DEP := $(OBJ:.o=.d)
@@ -31,7 +31,7 @@ $(OBJ): CPPFLAGS += $(DEPFLAGS)
 # Installation
 DESTDIR ?= $(BUILDROOT)/sysroot
 LIBDIR := $(DESTDIR)/usr/lib
-INCDIR := $(DESTDIR)/usr/include
+INCDIR := $(DESTDIR)/usr/include/mittos
 
 $(LIBDIR)/libmittos.a: libmittos.a
 	install -D $<  $@

src/libmittos/graphics/graphics.c

@@ -1,7 +1,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
-#include <mittos/graphics.h>
+#include <graphics.h>
 
 #define incptr(p, n) ((void *)(((uintptr_t)(p)) + (n)))
 
@@ -27,32 +27,23 @@ void draw_line(
     uint64_t y0, uint64_t y1,
     uint32_t clr
 ) {
-  // https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
-
   int64_t dx = x1 > x0 ? x1 - x0 : x0 - x1;
-  int sx = x0 < x1 ? 1 : -1;
   int64_t dy = y1 > y0 ? y1 - y0 : y0 - y1;
-  dy = -dy;
-  int sy = y0 < y1 ? 1 : -1;
-  int64_t err = dx + dy;
-
+  int sx = x1 > x0 ? 1 : -1;
+  int sy = y1 > y0 ? 1 : -1;
+  uint64_t x = x0, y = y0;
+  int64_t diff = dx - dy;
   uint32_t *fb = (uint32_t *)ctx->buffer;
   while(1) {
-    if(0 < x0 && x0 < ctx->width &&
-        0 < y0 && y0 < ctx->height)
-      fb[PXL(ctx, x0, y0)] = clr;
-    if(x0 == x1 && y0 == y1) break;
+    fb[PXL(ctx, x, y)] = clr;
+    if(x == x1 && y == y1) break;
 
-    int64_t e2 = 2*err;
-    if(e2 >= dy) {
-      if(x0 == x1) break;
-      err += dy;
-      x0 += sx;
-    }
-    if(e2 <= dx) {
-      if(y0 == y1) break;
-      err += dx;
-      y0 += sy;
+    if((2*diff) > -dy) {
+      diff -= dy;
+      x += sx;
+    } else {
+      diff += dx;
+      y += sy;
     }
   }
 }

src/libmittos/include/graphics.h

@@ -1,6 +1,5 @@
 #pragma once
 #include <stdlib.h>
-#include <stdint.h>
 
 typedef struct {
   uint32_t width;

toolchain/build-toolchain.sh

@@ -58,5 +58,7 @@ mkdir gcc-build && cd gcc-build
 make all-gcc all-target-libgcc -j 4
 make install-gcc install-target-libgcc
 
+apk del build-base
+
 cd /
 rm -rf /opt