partial implementation for ctc drivers and memory management

7 files changed, 53 insertions, 11 deletions

diff --git a/sw/z80/kernel/drivers/ctc.c b/sw/z80/kernel/drivers/ctc.c
new file mode 100644
index 0000000..e23ed8e
--- /dev/null
+++ b/sw/z80/kernel/drivers/ctc.c
@@ -0,0 +1 @@
+#include "drivers/ctc.h"
\ No newline at end of file
diff --git a/sw/z80/kernel/include/drivers/ctc.h b/sw/z80/kernel/include/drivers/ctc.h
new file mode 100644
index 0000000..488e02b
--- /dev/null
+++ b/sw/z80/kernel/include/drivers/ctc.h
@@ -0,0 +1,6 @@
+#ifndef __CTC_H__
+#define __CTC_H__
+
+void ctc_control()
+
+#endif /* __CTC_H__ */
\ No newline at end of file
diff --git a/sw/z80/kernel/include/fs/fs.h b/sw/z80/kernel/include/fs/fs.h
index 2a0e9d4..81c86b7 100644
--- a/sw/z80/kernel/include/fs/fs.h
+++ b/sw/z80/kernel/include/fs/fs.h
@@ -53,7 +53,7 @@ struct fs_inode
     time_t      ctime;  // creation time
 
     /* data storage informations */
-    uint24_t     size;
+    uint16_t     size;
     uint16_t     blocks[FS_BLOCKS_N];
 
 }
diff --git a/sw/z80/kernel/include/memory.h b/sw/z80/kernel/include/memory.h
index 60fc98a..67c4b88 100644
--- a/sw/z80/kernel/include/memory.h
+++ b/sw/z80/kernel/include/memory.h
@@ -6,6 +6,7 @@
 
 /* maximum number of pages on the system */
 #define PAGES_MAX_COUNT 32
+#define PAGE_SIZE     1000
 
 /* in our system there are only 16 pages since only 64KB can be addressed
  * to optimize the memory management in ROM and RAM only pages from this set
@@ -31,17 +32,19 @@
 #define ADDR_PAGE_14 0xE000
 #define ADDR_PAGE_15 0xF000
 
+#define ADDR_PAGE_FIRST  ADDR_PAGE_8
+#define ADDR_PAGE_LAST   ADDR_PAGE_15
+
 struct page
 {
 	pid_t pid;       // process owner of the page (0 if free)
     uint16_t addr;   // physical address
 };
 
-extern struct page pages_table[PAGES_MAX_COUNT];
-
 int mmu_write_table(void);
 
+int page_new(void);
 int page_map(int page, int pid, uint16_t addr);
 int page_unmap(int page);
 
-#endif // __MEMORY_H__
\ No newline at end of file
+#endif // __MEMORY_H__
diff --git a/sw/z80/kernel/include/types.h b/sw/z80/kernel/include/types.h
index b822144..7f38abb 100644
--- a/sw/z80/kernel/include/types.h
+++ b/sw/z80/kernel/include/types.h
@@ -10,15 +10,10 @@
 #define int8_t      char
 #define uint8_t     unsigned char
 #define int16_t     int
-#define uint16_t    unsigned long int
+#define uint16_t    unsigned int
 
 #define size_t      uint16_t
 #define pid_t 		uint8_t
-
 #define ino_t       uint16_t
 
-typedef struct {
-    uint    data : 24;
-} uint24_t;
-
 #endif
diff --git a/sw/z80/kernel/memory.c b/sw/z80/kernel/memory.c
index ca9f447..cfbcb81 100644
--- a/sw/z80/kernel/memory.c
+++ b/sw/z80/kernel/memory.c
@@ -1,6 +1,6 @@
 #include "memory.h"
 
-struct page pages_table[PAGES_MAX_COUNT];
+static struct page pages_table[PAGES_MAX_COUNT];
 
 int mmu_write_table(void)
 {
@@ -15,6 +15,26 @@ int mmu_write_table(void)
     return 0;
 }
 
+int page_new(void)
+{
+    int i, addr, used;
+    for (addr = ADDR_PAGE_FIRST; addr < ADDR_PAGE_LAST; addr += PAGE_SIZE) {
+        used = 0;
+
+        for (i = 0; i < PAGES_MAX_COUNT; i++) {
+            if (page_map[i].addr == addr) {
+                used = 1;
+                break;
+            }
+        }
+
+        if (!used)
+            return i;
+    }
+
+    return -1;
+}
+
 int page_map(int page, int pid, uint16_t addr)
 {
     if (page >= PAGES_MAX_COUNT)
@@ -38,5 +58,6 @@ int page_unmap(int page)
         return -2;
 
     pages_table[page].pid = 0;
+    pages_table[page].addr = 0;
     return 0;
 }
diff --git a/sw/z80/kernel/process.c b/sw/z80/kernel/process.c
index b43fa11..049c88c 100644
--- a/sw/z80/kernel/process.c
+++ b/sw/z80/kernel/process.c
@@ -26,7 +26,23 @@ pid_t newpid(void)
 
 int fork(void)
 {
+    int i, p;
+    pid_t child_pid = newpid();
 
+    if (child_pid == 0)
+        return -1;
+
+
+    for (i = 0; i < current_proc.pages; i++) {
+        p = page_new();
+
+        if (p == -1) {
+            
+            return -2;
+        }
+
+        proc_table[child_pid].page[i] = p;
+    }
 }
 
 int exec(char *path, char *args)