Boot loader structures (WORK IN PROGRESS)

Some Program manager structures, macros and functions (WORK IN PROGRESS)

4 files changed, 194 insertions, 0 deletions

diff --git a/sw/z80/kernel/boot_loader.c b/sw/z80/kernel/boot_loader.c
new file mode 100644
index 0000000..b7873ec
--- /dev/null
+++ b/sw/z80/kernel/boot_loader.c
@@ -0,0 +1,13 @@
+#include "boot.h"
+#include "progman.h"
+
+#define DEFAULT_EXEC_STATUS 0x4000
+
+struct exec_status *status = EXEC_STATUS; 
+
+void boot_init() {
+
+    *status = DEFAULT_EXEC_STATUS;
+
+    // TODO other stuff
+}
\ No newline at end of file
diff --git a/sw/z80/kernel/include/boot.h b/sw/z80/kernel/include/boot.h
new file mode 100644
index 0000000..d581687
--- /dev/null
+++ b/sw/z80/kernel/include/boot.h
@@ -0,0 +1,18 @@
+#ifndef BOOT_H
+#define BOOT_H
+
+#define LOGIN_PC    // TODO find an address in ROM, to perform jumps
+
+#define EXEC_STATUS // TODO find an address in Kernel space
+
+struct exec_status {
+
+    volatile int logged_in:1;   // authenticated
+    volatile int k_control:1;   // no running programs
+    volatile int program_id:1;  // current running program id, see "progman.h"
+    volatile int hidden_pc:13;  // program counter of the paused program
+};
+
+void boot_init();
+
+#endif
\ No newline at end of file
diff --git a/sw/z80/kernel/include/progman.h b/sw/z80/kernel/include/progman.h
new file mode 100644
index 0000000..b37e9e9
--- /dev/null
+++ b/sw/z80/kernel/include/progman.h
@@ -0,0 +1,63 @@
+#ifndef PROGRAM_MAN
+#define PROGRAM_MAN
+
+#include "types.h"
+
+#define PROG_0 0x0
+#define PROG_1 0x1
+
+#define PROG_VSTART 0x1000
+#define PROG_0_PREFIX 0xA000
+#define PROG_1_PREFIX 0xC000
+
+#define PROG_0_INFO     // TODO
+#define PROG_1_INFO     // TODO find a space in the ram
+
+struct program_info {
+
+    volatile int enabled:1;
+    volatile int running:1;
+    volatile int exiting:1;
+    volatile int heap_addr:13;
+    volatile void (*quit_cb)(void);   // 16
+};
+
+/*
+*   Initialize the program manager system
+*/
+
+void progman_init();
+
+/*  
+*   Check if it can start a new program
+*   If it succedes, the program id is returned,
+*   otherwise it is returned an error number
+*/
+
+#define PROG_REQ_FULL -1
+#define PROG_REQ_ERR -2     // Maybe we don't need this, but just in case
+
+int8_t prog_req(struct program_info *info);
+
+/*
+*   It sets a quit callback
+*/
+
+void prog_0_qcb(void (*callback)(void));
+void prog_1_qcb(void (*callback)(void));
+
+/*
+*   It quits a program, if a callback is set, it will be called
+*/
+
+void prog_0_quit();
+void prog_1_quit();
+
+/*
+*   It forces a program to quit
+*/
+
+void prog_0_fquit();
+void prog_1_fquit();
+
+#endif
\ No newline at end of file
diff --git a/sw/z80/kernel/programs.c b/sw/z80/kernel/programs.c
new file mode 100644
index 0000000..31593d1
--- /dev/null
+++ b/sw/z80/kernel/programs.c
@@ -0,0 +1,100 @@
+#include "progman.h"
+
+#define EMPTY_PROG_INFO 0x0
+
+struct program_info *prog_0 = PROG_0_INFO,
+                    *prog_1 = PROG_1_INFO;
+
+void progman_init() {
+
+    *prog_0 = EMPTY_PROG_INFO;
+    *prog_1 = EMPTY_PROG_INFO;
+
+    // TODO other stuff
+}
+
+int8_t prog_req(struct program_info *info) {
+
+    uint8_t prog;
+
+    if (!prog_0->enabled) {
+
+        prog = PROG_0;
+        *info = *prog_0;
+
+    } else if (!prog_1->enabled) {
+
+        prog = PROG_1;
+        *info = *prog_1;
+
+    } else {
+
+        return PROG_REQ_FULL;
+    }
+
+    return prog;
+}
+
+void prog_0_qcb(void (*callback)(void)) {
+
+    prog_0->quit_cb = callback;
+}
+
+void prog_1_qcb(void (*callback)(void)) {
+
+    prog_1->quit_cb = callback;
+}
+
+void prog_0_quit() {
+    
+    if (!prog_0->enabled || prog_0->exiting)
+        return;
+
+    if (prog_0->quit_cb)
+        prog_0->quit_cb();
+
+    // TODO free space in RAM
+
+    *prog_0 = EMPTY_PROG_INFO;
+
+    // TODO jump program counter
+}
+
+void prog_1_quit() {
+    
+    if (!prog_1->enabled || prog_1->exiting)
+        return;
+
+    if (prog_1->quit_cb)
+        prog_1->quit_cb();
+
+    // TODO free space in RAM
+
+    *prog_1 = EMPTY_PROG_INFO;
+
+    // TODO jump program counter
+}
+
+void prog_0_fquit() {
+
+    if (!prog_0->enabled)
+        return;
+
+    // TODO free space in RAM
+
+    *prog_0 = EMPTY_PROG_INFO;
+
+    // TODO jump program counter
+}
+
+void prog_1_fquit() {
+
+    if (!prog_1->enabled)
+        return;
+
+    // TODO free space in RAM
+
+    *prog_1 = EMPTY_PROG_INFO;
+
+    // TODO jump program counter
+}
\ No newline at end of file