new structure for process management, structures to discuss

the idea behind kernel/include/progman.h was good but the implementation was
very not unix-like, so I made a new file under
kernel/include/process.h that will implement the same features

other changes:
  - move usart register structs definitions outside of the device
  - remove old build files
  - delete boot.h and boot_loader.h (as they weren't used by anything)
  - change on makefile to build binary with `makebin` instead of `xxd`
  - new file memory.h to implement memory mapping and mmu control
  - new type `uint` in types.h

1 files changed, 42 insertions, 0 deletions

diff --git a/sw/z80/kernel/include/process.h b/sw/z80/kernel/include/process.h
new file mode 100644
index 0000000..ffd39e7
--- /dev/null
+++ b/sw/z80/kernel/include/process.h
@@ -0,0 +1,42 @@
+#ifndef __PROCESS_H__
+#define __PROCESS_H__
+
+#include "types.h"
+
+ /* maximum number of processes (i.e. pages in ram)
+  * since each program can use only one page in ram
+  */
+#define PROC_COUNT 2 
+
+struct executable
+{
+	void *text;
+	size_t text_size;
+	void *bss;
+	size_t bss_size;
+}
+
+struct process
+{
+    uint blocked :1;	// process is waiting for hardware or locked
+    uint running :1;	// pid is used
+    uint pages[4];		// pages used by the process
+    // TODO: implement quick callback?
+};
+
+/* the pid is defined with a single byte (pid_t is uint8_t), because of that 
+ * there cannot be more than 255 processes open at the same time. this is a
+ * limitation but for our purposes is more than enough
+ */
+extern struct process proc_table[255];
+
+static pid_t newpid(void);
+
+int fork(void);
+int exec(char *path, char *args);
+int spawn(char *path, char *args);
+
+pid_t getpid(void);
+int kill(pid_t pid);
+
+#endif // __PROCESS_H__