Moved syscall related code to common. Add hello.c and world.c in preparation for testing pre-emptive multitasking

src/common/common.c

@@ -0,0 +1,61 @@
+#include "common.h"
+
+void print(char* string) {
+  asm volatile ("mov $0, %%eax; mov %0, %%esi; int $0x7f" : : "m" (string) : "eax", "esi");
+}
+
+char getch() {
+  asm volatile ("mov $1, %%eax; int $0x7f" : : :);
+}
+
+uint8_t getchPS2() {
+  asm volatile ("mov $2, %%eax; int $0x7f" : : :);
+}
+
+void readfile(char* filename, uint8_t* buffer) {
+  asm volatile ("mov $3, %%eax; mov %0, %%esi; mov %1, %%edi; int $0x7f" : : "m" (filename), "m" (buffer) : "eax", "esi", "edi");
+}
+
+void* localalloc(uint32_t size) {
+  asm volatile ("mov $4, %%eax; mov %0, %%esi; int $0x7f" : : "m" (size) : "esi");
+}
+
+void localdelete(void* ptr) {
+  asm volatile ("mov $5, %%eax; mov %0, %%esi; int $0x7f" : : "m" (ptr) : "esi");
+}
+
+uint32_t filesize(char* filename) {
+  asm volatile ("mov $6, %%eax; mov %0, %%esi; int $0x7f" : : "m" (filename) : "esi");
+}
+
+int int_to_decimal(unsigned int number, char* string_buffer) {
+  for (int i=0; i<11; i++)
+    string_buffer[i] = 0;
+  
+  int index = 9;
+  unsigned int acc = number;
+  if (acc == 0)
+    string_buffer[index--] = '0';
+  while (acc != 0) {
+    string_buffer[index--] = 0x30+(acc%10);
+    acc /= 10;
+  }
+  return (index+1);
+}
+
+char dec_to_hex[16] = "0123456789abcdef";
+int int_to_hex(unsigned int number, char* string_buffer) { 
+  for (int i=0; i<8; i++)
+    string_buffer[i] = '0';
+  string_buffer[8] = 0;
+  
+  int index = 7;
+  unsigned int acc = number;
+  if (acc == 0)
+    string_buffer[index--] = '0';
+  while (acc != 0) {
+    string_buffer[index--] = dec_to_hex[acc%0x10];
+    acc /= 0x10;
+  }
+  return (index+1);
+}

src/common/common.h

@@ -0,0 +1,17 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+#include "../kernel/types.h"
+
+void print(char* string);
+char getch();
+uint8_t getchPS2();
+void readfile(char* filename, uint8_t* buffer);
+void* localalloc(uint32_t size);
+void localdelete(void* ptr);
+uint32_t filesize(char* filename);
+
+int int_to_decimal(unsigned int number, char* string_buffer);
+int int_to_hex(unsigned int number, char* string_buffer);
+
+#endif

src/program/hello.c

@@ -0,0 +1,7 @@
+#include "../common/common.h"
+
+int main() {
+  while (1) {
+    print("Hello");
+  }
+}

src/program/hello.ld

@@ -0,0 +1,14 @@
+OUTPUT_FORMAT(binary)
+OUTPUT_ARCH(i386:i386)
+
+OUTPUT(build/program/hello.bin)
+
+SECTIONS {
+  . = 0x8020;
+
+  .text : {
+    build/program_code_entry.o(.text)
+    build/program/hello.o(.text)
+    build/common/common.o(.text)
+  }
+}

src/program/program.c

@@ -1,64 +1,5 @@
 #include "../kernel/types.h"
-
+#include "../common/common.h"
-void print(char* string) {
-  asm volatile ("mov $0, %%eax; mov %0, %%esi; int $0x7f" : : "m" (string) : "eax", "esi");
-}
-
-char getch() {
-  asm volatile ("mov $1, %%eax; int $0x7f" : : :);
-}
-
-uint8_t getchPS2() {
-  asm volatile ("mov $2, %%eax; int $0x7f" : : :);
-}
-
-void readfile(char* filename, uint8_t* buffer) {
-  asm volatile ("mov $3, %%eax; mov %0, %%esi; mov %1, %%edi; int $0x7f" : : "m" (filename), "m" (buffer) : "eax", "esi", "edi");
-}
-
-void* localalloc(uint32_t size) {
-  asm volatile ("mov $4, %%eax; mov %0, %%esi; int $0x7f" : : "m" (size) : "esi");
-}
-
-void localdelete(void* ptr) {
-  asm volatile ("mov $5, %%eax; mov %0, %%esi; int $0x7f" : : "m" (ptr) : "esi");
-}
-
-uint32_t filesize(char* filename) {
-  asm volatile ("mov $6, %%eax; mov %0, %%esi; int $0x7f" : : "m" (filename) : "esi");
-}
-
-int int_to_decimal(unsigned int number, char* string_buffer) {
-  for (int i=0; i<11; i++)
-    string_buffer[i] = 0;
-  
-  int index = 9;
-  unsigned int acc = number;
-  if (acc == 0)
-    string_buffer[index--] = '0';
-  while (acc != 0) {
-    string_buffer[index--] = 0x30+(acc%10);
-    acc /= 10;
-  }
-  return (index+1);
-}
-
-char dec_to_hex[16] = "0123456789abcdef";
-int int_to_hex(unsigned int number, char* string_buffer) { 
-  for (int i=0; i<8; i++)
-    string_buffer[i] = '0';
-  string_buffer[8] = 0;
-  
-  int index = 7;
-  unsigned int acc = number;
-  if (acc == 0)
-    string_buffer[index--] = '0';
-  while (acc != 0) {
-    string_buffer[index--] = dec_to_hex[acc%0x10];
-    acc /= 0x10;
-  }
-  return (index+1);
-}
 
 int main() {
   print("Testing C code program\n");
@@ -76,5 +17,4 @@ int main() {
   print("\n");
   readfile("HELLO   TXT", alpha_buffer);
   print(alpha_buffer);
-  while (1);
 }

src/program/program.ld

@@ -9,5 +9,6 @@ SECTIONS {
   .text : {
     build/program_code_entry.o(.text)
     build/program/program.o(.text)
+    build/common/common.o(.text)
   }
 }

src/program/world.c

@@ -0,0 +1,7 @@
+#include "../common/common.h"
+
+int main() {
+  while (1) {
+    print("World");
+  }
+}

src/program/world.ld

@@ -0,0 +1,14 @@
+OUTPUT_FORMAT(binary)
+OUTPUT_ARCH(i386:i386)
+
+OUTPUT(build/program/world.bin)
+
+SECTIONS {
+  . = 0x8020;
+
+  .text : {
+    build/program_code_entry.o(.text)
+    build/program/world.o(.text)
+    build/common/common.o(.text)
+  }
+}