7 files changed, 323 insertions, 0 deletions
diff --git a/sw/z80/kernel/include/login.h b/sw/z80/kernel/include/login.h
new file mode 100644
index 0000000..5fa4b5e
--- /dev/null
+++ b/sw/z80/kernel/include/login.h
@@ -0,0 +1,23 @@
+#ifndef LOGIN_H
+#define LOGIN_H
+
+#include "types.h"
+
+#define LOGIN_PC    // TODO find an address in ROM, to perform jumps
+
+#define PWD_ADDR // TODO find an address in ROM, password
+#define PWD_SIZE 8
+
+/*
+*   It returns 1 if succeded, otherwise 0
+*/
+
+int8_t authenticate(const char *pwd);
+
+/*
+*   It sets the password in the ROM space, maximum 8 characters
+*/
+
+void set_pwd(const char *pwd);
+
+#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..b59e14a
--- /dev/null
+++ b/sw/z80/kernel/include/progman.h
@@ -0,0 +1,109 @@
+#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 prog_status {
+
+    // The program is in execution
+
+    uint8_t running:1;
+
+    // The program is executing its quit callback
+
+    uint8_t exiting:1;
+
+    uint8_t unused:6;  // TODO, find a usage for these bits
+}:
+
+struct prog_data {
+
+    struct prog_status status;
+
+    /*
+    *   The following addresses are needed to map 
+    *   map the usable memory for dynamic allocations
+    */
+
+    // Virtual address of the heap
+
+    uint8_t heap_addr:12;
+
+    // Virtual address of the stack limit
+
+    uint8_t stack_limit:12;
+
+    /*
+    *   Function called when the program exits normally
+    */
+
+    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
+*
+*   ! Disable virtual addresses when this function is called
+*/
+
+#define PROG_REQ_FULL -1
+
+int8_t prog_req();
+
+/*
+*   It allocates a program in the RAM
+*   To obtain the right id call prog_req() first
+*   Basic informations must be allocated and referenced by a program_base struct
+*
+*   ! Disable virtual addresses when this function is called
+*/
+
+struct prog_space {
+
+    void * inst_set;    // pointer to the instructions set
+    size_t inst_size;   // size of the instructions set
+    void * bss_data;    // pointer to the bss/data space
+    size_t data_size;   // size of the bss/data space
+};
+
+void prog_alloc(int8_t id, struct prog_data *data, const struct prog_space *space);
+
+/*
+*   It jumps the program counter to the given one
+*/
+
+void prog_exec(int8_t id, struct prog_data *data);
+
+/*
+*   It sets a quit callback
+*/
+
+void prog_0_set_qcb(void (*callback)(void));
+void prog_1_set_qcb(void (*callback)(void));
+
+/*
+*   It quits a program, if a callback is set, it will be called
+*/
+
+void prog_0_quit(uint8_t force);
+void prog_1_quit(uint8_t force);
+
+#endif
+\ No newline at end of file
diff --git a/sw/z80/kernel/include/syscall.h b/sw/z80/kernel/include/syscall.h
new file mode 100644
index 0000000..9641f25
--- /dev/null
+++ b/sw/z80/kernel/include/syscall.h
@@ -0,0 +1,20 @@
+#ifndef SYS_CALL
+#define SYS_CALL
+
+/*
+*   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
diff --git a/sw/z80/kernel/include/sysexe.h b/sw/z80/kernel/include/sysexe.h
new file mode 100644
index 0000000..9c13c09
--- /dev/null
+++ b/sw/z80/kernel/include/sysexe.h
@@ -0,0 +1,55 @@
+#ifndef SYS_EXE
+#define SYS_EXE
+
+#define SYS_EXEC_ADDR // TODO find an address in Kernel space
+
+struct sys_progman {
+
+    // program 0 enabled
+
+    uint8_t prog_0_enabled:1;
+
+    // program 1 enabled
+
+    /*
+    *   Obs: A program is enabled when its space is allocated 
+    *        and its virtual program counter is stored in 
+    *        the hardware or in the silent_pc.
+    *        An enabled program is not necessarly running, it 
+    *        could be paused too.
+    */
+
+    uint8_t prog_1_enabled:1;
+
+    // running's program id
+
+    uint8_t prog_running:1;
+};
+
+struct sys_exec {
+
+    /*
+    *   Virtual addresses are activated
+    */
+
+    uint8_t virtual_addr:1;
+
+    struct sys_progman progman;
+
+    /*
+    *   The silent_pc is the place designed to store the 
+    *   program counter of the program that's not running
+    */
+
+    uint8_t silent_pc:12;
+};
+
+/*
+*   Function to access informations
+*/
+
+uint8_t vaddr_enabled();
+
+struct sys_progman * sys_prog_data(struct sys_progman *data);
+
+#endif
+\ No newline at end of file
diff --git a/sw/z80/kernel/login.c b/sw/z80/kernel/login.c
new file mode 100644
index 0000000..5e100bf
--- /dev/null
+++ b/sw/z80/kernel/login.c
@@ -0,0 +1,12 @@
+#include "login.h"
+#include "string.h"
+
+int8_t authenticate(const char *pwd) {
+
+    return !memcmp(PWD_ADDR, pwd, PWD_SIZE);
+}
+
+void set_pwd(const char *pwd) {
+
+    memcpy(PWD_ADDR, pwd, PWD_SIZE);
+}
+\ No newline at end of file
diff --git a/sw/z80/kernel/progman.c b/sw/z80/kernel/progman.c
new file mode 100644
index 0000000..44888f8
--- /dev/null
+++ b/sw/z80/kernel/progman.c
@@ -0,0 +1,90 @@
+#include "progman.h"
+#include "string.h"
+#include "syscall.h"
+#include "sysexe.h"
+
+#define EMPTY_PROG_INFO 0x0
+
+volatile struct prog_data *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 sys_progman data;
+
+    sys_prog_data(&data);
+
+    if (data.prog_0_enabled)
+        return PROG_0;
+    else if (data.prog_1_enabled)
+        return PROG_1;
+
+    return PROG_REQ_FULL;
+}
+
+void prog_alloc(int8_t id, struct prog_data *data, const struct prog_space *space) {
+
+    void *addr = (id ? PROG_1_PREFIX : PROG_0_PREFIX) + PROG_VSTART;
+
+    memcpy(addr, base->inst_set, base->inst_size);
+
+    addr += base->inst_size;
+
+    memcpy(addr, base->bss_data, base->data_size);
+
+    addr += base->data_size;
+
+    // TODO, empty heap and stack
+}
+
+void prog_exec(int8_t id, struct prog_data *data) {
+
+    if (id)
+        prog_exec_1();  // system call
+    else
+        prog_exec_0();  // system call
+}
+
+void prog_0_set_qcb(void (*callback)(void)) {
+
+    prog_0->quit_cb = callback;
+}
+
+void prog_1_set_qcb(void (*callback)(void)) {
+
+    prog_1->quit_cb = callback;
+}
+
+void prog_0_quit(uint8_t force) {
+    
+    if (!prog_0->enabled || prog_0->exiting)
+        return;
+
+    if (!force && prog_0->quit_cb)
+        prog_0->quit_cb();
+
+    *prog_0 = EMPTY_PROG_INFO;
+
+    prog_stop_0();  // system call
+}
+
+void prog_1_quit(uint8_t force) {
+    
+    if (!prog_1->enabled || prog_1->exiting)
+        return;
+
+    if (!force && prog_1->quit_cb)
+        prog_1->quit_cb();
+
+    *prog_1 = EMPTY_PROG_INFO;
+
+    prog_stop_1();  // system call
+}
+\ No newline at end of file
diff --git a/sw/z80/kernel/sysexe.c b/sw/z80/kernel/sysexe.c
new file mode 100644
index 0000000..f020b88
--- /dev/null
+++ b/sw/z80/kernel/sysexe.c
@@ -0,0 +1,14 @@
+#include "sysexe.h"
+
+volatile struct sys_exec *exec_data = SYS_EXEC_ADDR;
+
+uint8_t vaddr_enabled() {
+
+    return exec_data->virtual_addr;
+}
+
+struct sys_progman * sys_prog_data(struct sys_progman *data) {
+
+    *data = exec_data->sys_progman;
+    return data;
+}
+\ No newline at end of file