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-rw-r--r--sw/z80/kernel/drivers/pio.c29
-rw-r--r--sw/z80/kernel/include/drivers/pio.h20
-rw-r--r--sw/z80/kernel/include/memory.h3
-rw-r--r--sw/z80/kernel/include/process.h21
-rw-r--r--sw/z80/kernel/include/syscall.h20
-rw-r--r--sw/z80/kernel/memory.c9
-rw-r--r--sw/z80/kernel/process.c22
-rw-r--r--sw/z80/libc/string.c20
-rw-r--r--sw/z80/makefile3
9 files changed, 81 insertions, 66 deletions
diff --git a/sw/z80/kernel/drivers/pio.c b/sw/z80/kernel/drivers/pio.c
index 289ebe0..4321fb8 100644
--- a/sw/z80/kernel/drivers/pio.c
+++ b/sw/z80/kernel/drivers/pio.c
@@ -3,17 +3,38 @@
static uint8_t *pio_port = (uint8_t *) ADDR_DEV_PIO;
static uint8_t *pio_ctrl = (uint8_t *) (ADDR_DEV_PIO + 2);
-void _pio_data(int port, uint8_t data)
+inline void _pio_data(int port, uint8_t data)
{
*(pio_port + port) = data;
}
-void _pio_command(int port, uint8_t cmd)
+inline void _pio_control(int port, uint8_t cmd)
{
*(pio_ctrl + port) = cmd;
}
-/* void pio_set_mode(int port, int mode)
+void pio_set_mode(int port, int mode, uint8_t io)
{
+ // 0x0F is a control sequence to set mode
+ _pio_control(port, ((mode << 6) | 0x0F));
-} */
+ // this mode requires an additional argument that sets
+ // a mode for each pin
+ if (mode == PIO_MODE_BIT_IO) {
+ _pio_control(port, io);
+ }
+}
+
+void pio_set_interrupts(int port, int control)
+{
+ // 0x07 is a control sequence to set interrupts
+ _pio_control(port, (control | 0x07));
+}
+
+void pio_set_interrupts_mask(int port, int control, uint8_t mask)
+{
+ // 0x17 is a control sequence to set interrupts
+ // and to interpret the next byte as a mask
+ _pio_control(port, (control | 0x17));
+ _pio_control(port, mask);
+}
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
diff --git a/sw/z80/kernel/memory.c b/sw/z80/kernel/memory.c
index f174906..ca9f447 100644
--- a/sw/z80/kernel/memory.c
+++ b/sw/z80/kernel/memory.c
@@ -7,7 +7,7 @@ int mmu_write_table(void)
int i;
for (i = 0; i < PAGES_MAX_COUNT; i++) {
- if (pages_table[i].used) {
+ if (pages_table[i].pid != 0) {
// write to mmu table
}
}
@@ -20,13 +20,12 @@ int page_map(int page, int pid, uint16_t addr)
if (page >= PAGES_MAX_COUNT)
return -1;
- if (pages_table[page].used)
+ if (pages_table[page].pid != 0)
return -2;
pages_table[page].addr = addr;
pages_table[page].pid = pid;
- pages_table[page].used = 1;
return 0;
}
@@ -35,9 +34,9 @@ int page_unmap(int page)
if (page >= PAGES_MAX_COUNT)
return -1;
- if (pages_table[page].used == 0)
+ if (pages_table[page].pid == 0)
return -2;
- pages_table[page].used = 0;
+ pages_table[page].pid = 0;
return 0;
}
diff --git a/sw/z80/kernel/process.c b/sw/z80/kernel/process.c
index 49b86b8..b43fa11 100644
--- a/sw/z80/kernel/process.c
+++ b/sw/z80/kernel/process.c
@@ -1,16 +1,32 @@
#include "process.h"
-struct process proc_table[255];
+static struct process proc_table[PID_COUNT_MAX];
+static struct process *current_proc;
pid_t newpid(void)
{
+ int i;
static pid_t last_pid = 0;
- return ++last_pid;
+
+ for (i = 0; i < PID_COUNT_MAX; i++, last_pid++) {
+ if (last_pid == PID_COUNT_MAX) {
+ last_pid = 0;
+ continue;
+ }
+
+ if (!proc_table[last_pid].running)
+ break;
+ }
+
+ if (i >= PID_COUNT_MAX)
+ return 0;
+
+ return last_pid;
}
int fork(void)
{
-
+
}
int exec(char *path, char *args)
diff --git a/sw/z80/libc/string.c b/sw/z80/libc/string.c
index 9dd56cc..57b3a7f 100644
--- a/sw/z80/libc/string.c
+++ b/sw/z80/libc/string.c
@@ -1,11 +1,11 @@
#include "string.h"
-void * memset(void *dest, const int8_t src, size_t n) {
+void *memset(void *dest, const int8_t src, size_t n) {
- void *dp = dest;
+ char *dp = (char *) dest;
while (n--)
- *dp++ = src;
+ *(dp++) = src;
return dest;
}
@@ -22,16 +22,14 @@ void *memcpy(void *dest, void *src, size_t n)
return dest;
}
-int8_t memcmp(const void *s1, const void *s2, size_t n) {
-
- uint8_t u1, u2;
-
- for ( ; n--; s1++, s2++) {
+int8_t memcmp(void *s1, void *s2, size_t n)
+{
+ char *u1 = (char *) s1;
+ char *u2 = (char *) s2;
- u1 = *s1;
- u2 = *s2;
+ for ( ; n--; u1++, u2++) {
- if (u1 != u2)
+ if (*u1 != *u2)
return u1 - u2;
}
diff --git a/sw/z80/makefile b/sw/z80/makefile
index 5047824..5ab7e93 100644
--- a/sw/z80/makefile
+++ b/sw/z80/makefile
@@ -20,6 +20,7 @@ CFLAGS := -mz80 \
-I kernel/include \
-I kernel/include/drivers \
-I libc/include \
+ --opt-code-size \
-DDEBUG
LDFLAGS := -mz80 --no-std-crt0 crt0.rel \
@@ -43,7 +44,7 @@ crt0.rel: crt0.s
sdasz80 -o $<
dirs:
- mkdir -p build build/kernel build/libc
+ mkdir -p build build/kernel build/libc build/kernel/drivers
dis: $(BINARY)
@# z80dasm -a -l -g 0h $< -o build/$(OSNAME).s
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-25 05:31:59 +0100