implements pio.h functions and makefile update to optimize size

- remove syscall.h, unused and not implemented
- bug fix for memcmp() in string.c

other changes are still partially unfinished and might not work

4 files changed, 22 insertions, 42 deletions

diff --git a/sw/z80/kernel/include/drivers/pio.h b/sw/z80/kernel/include/drivers/pio.h
index 5d289ca..0df2ed0 100644
--- a/sw/z80/kernel/include/drivers/pio.h
+++ b/sw/z80/kernel/include/drivers/pio.h
@@ -7,25 +7,27 @@
 #define PIO_A       0
 #define PIO_B       1
 
-#define PIO_MODE_0  0
-#define PIO_MODE_1  1
-#define PIO_MODE_2  2
-#define PIO_MODE_3  3
+#define PIO_MODE_BYTE_IN   0
+#define PIO_MODE_BYTE_OUT  1
+#define PIO_MODE_BYTE_BI   2
+#define PIO_MODE_BIT_IO    3
 
 #define PIO_INT_ACTIVE_HIGH     (1<<5)
 #define PIO_INT_AND_MODE        (1<<6)
 #define PIO_INT_ENABLE          (1<<7)
 
 
-void _pio_data(int port, uint8_t data);
-void _pio_command(int port, uint8_t cmd);
+inline void _pio_data(int port, uint8_t data);
+inline void _pio_control(int port, uint8_t cmd);
+
+void pio_set_mode(int port, int mode, uint8_t io);
 
-void pio_set_mode(int port, int mode);
 void pio_set_interrupts(int port, int control);
-void pio_set_interrupts_mask(int port, uint8_t mask);
-void pio_set_io(int port, uint8_t io);
+void pio_set_interrupts_mask(int port, int control, uint8_t mask);
 
 // uint8_t pio_read_data(int port);
+uint8_t pio_read(int port);
+void pio_write(int port, uint8_t data);
 
 inline int pio_read_pin(int port, uint8_t pin);
 inline void pio_write_pin(int port, uint8_t pin);
diff --git a/sw/z80/kernel/include/memory.h b/sw/z80/kernel/include/memory.h
index e4352b5..60fc98a 100644
--- a/sw/z80/kernel/include/memory.h
+++ b/sw/z80/kernel/include/memory.h
@@ -33,8 +33,7 @@
 
 struct page
 {
-	uint used :1;
-	pid_t pid;     // process owner of the page
+	pid_t pid;       // process owner of the page (0 if free)
     uint16_t addr;   // physical address
 };
 
diff --git a/sw/z80/kernel/include/process.h b/sw/z80/kernel/include/process.h
index d7aa7fd..3b0c843 100644
--- a/sw/z80/kernel/include/process.h
+++ b/sw/z80/kernel/include/process.h
@@ -9,6 +9,12 @@
   */
 #define PROC_COUNT 2 
 
+/* 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
+ */
+#define PID_COUNT_MAX 255
+
 struct executable
 {
     void *text;
@@ -19,19 +25,12 @@ struct executable
 
 struct process
 {
-    uint blocked :1;    // process is waiting for hardware or locked
-    uint running :1;    // pid is used
-    struct page pages[4];      // pages used by the process
-    // TODO: implement quick callback?
+    uint blocked :1;      // process is waiting for hardware or locked
+    uint running :1;      // pid is used
+    uint pages;           // number of pages used by the process
+    struct page page[4];  // pages used by the process
 };
 
-/* 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];
-extern struct process *current_proc;
-
 pid_t newpid(void);
 
 int fork(void);
diff --git a/sw/z80/kernel/include/syscall.h b/sw/z80/kernel/include/syscall.h
deleted file mode 100644
index 29941c9..0000000
--- a/sw/z80/kernel/include/syscall.h
+++ /dev/null
@@ -1,20 +0,0 @@
-#ifndef __SYS_CALL_H__
-#define __SYS_CALL_H__
-
-/*
-*   Enable / disable virtual address traslation
-*/
-
-extern void v_addr(uint8_t flag);
-
-/*
-*   Programs execution
-*/
-
-extern void prog_exec_0(void);
-extern void prog_exec_1(void);
-
-extern void prog_stop_0(void);
-extern void prog_stop_1(void);
-
-#endif
\ No newline at end of file