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-rw-r--r--doc/syscalls.txt34
-rw-r--r--src/common/include/sched.h15
-rw-r--r--src/common/include/tce/syscalls.h19
-rw-r--r--src/kernel/task/idt.cpp8
-rw-r--r--src/kernel/task/sched.cpp2
-rw-r--r--src/kernel/task/syscall.cpp34
-rw-r--r--src/user/lib/include/tce/syscall.h1
-rw-r--r--src/user/lib/tce/syscall.c22
8 files changed, 85 insertions, 50 deletions
diff --git a/doc/syscalls.txt b/doc/syscalls.txt
index c94db19..5df2cf6 100644
--- a/doc/syscalls.txt
+++ b/doc/syscalls.txt
@@ -1,25 +1,25 @@
-Syscalls pass by int64. The identifier of the called function is in eax, parameters
-are in ebx, ecx, edx, esi, edi.
+Syscalls pass by int64. The identifier of the called function is in ebx, with
+eax = 0, parameters are in ecx, edx, esi, edi.
Syscall list :
-id=eax Name Parameters Description
- 0 thread_exit none Signal kernel that current thread has finished
- 1 schedule none Switch to next thread (might be the current one)
- 2 thread_sleep ebx: time (int) msecs Tell kernel to put current thread to sleep
- 3 process_exit ebx: return value (int) Tell kernel to end current process, cleaning up everything
- 4 printk ebx: addr of a string Print a message to screen
- 5 thread_new ebx: entry point Creates a new thread
- ecx: data pointer
- edx: stack pointer
- 6 irq_wait ebx: irq number Waits for an IRQ (requires privilege PL_DRIVER)
- 7 proc_priv none Returns current process privilege level
+id=ebx Name Parameters Description
+ 1 thread_exit none Signal kernel that current thread has finished
+ 2 schedule none Switch to next thread (might be the current one)
+ 3 thread_sleep ecx: time (int) msecs Tell kernel to put current thread to sleep
+ 4 process_exit ecx: return value (int) Tell kernel to end current process, cleaning up everything
+ 5 printk ecx: addr of a string Print a message to screen
+ 6 thread_new ecx: entry point Creates a new thread
+ edx: data pointer
+ esi: stack pointer
+ 7 irq_wait ecx: irq number Waits for an IRQ (requires privilege PL_DRIVER)
+ 8 proc_priv none Returns current process privilege level
- 8 sbrk ebx: size Allocates some memory
- 9 brk ebx: new_end Allocates/frees some memory
+ 9 sbrk ecx: size Allocates some memory
+ 10 brk ecx: new_end Allocates/frees some memory
- 10 mmap (see linux specs)
- 11 munmap (see linux specs)
+ 11 mmap (see linux specs)
+ 12 munmap (see linux specs)
If a processes wishes to exit with an error code, it HAS to use process_exit. thread_exit will do nothing.
diff --git a/src/common/include/sched.h b/src/common/include/sched.h
index 0f8f8f4..1fe148d 100644
--- a/src/common/include/sched.h
+++ b/src/common/include/sched.h
@@ -7,9 +7,18 @@
#define MUTEX_UNLOCKED 0
//A mutex is just an uint32_t
+typedef uint32_t mutex_t;
-int mutex_lock(uint32_t* mutex); //wait for mutex to be free
-int mutex_lockE(uint32_t* mutex); //lock mutex only if free, returns !0 if locked, 0 if was busy
-void mutex_unlock(uint32_t* mutex);
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int mutex_lock(mutex_t* mutex); //wait for mutex to be free
+int mutex_lockE(mutex_t* mutex); //lock mutex only if free, returns !0 if locked, 0 if was busy
+void mutex_unlock(mutex_t* mutex);
+
+#ifdef __cplusplus
+}
+#endif
#endif
diff --git a/src/common/include/tce/syscalls.h b/src/common/include/tce/syscalls.h
new file mode 100644
index 0000000..3b5b68f
--- /dev/null
+++ b/src/common/include/tce/syscalls.h
@@ -0,0 +1,19 @@
+#ifndef DEF_TCE_SYSCALLS_H
+#define DEF_TCE_SYSCALLS_H
+
+#define SC_THREAD_EXIT 1
+#define SC_SCHEDULE 2
+#define SC_THREAD_SLEEP 3
+#define SC_PROCESS_EXIT 4
+#define SC_PRINTK 5
+#define SC_THREAD_NEW 6
+#define SC_IRQ_WAIT 7
+#define SC_PROC_PRIV 8
+#define SC_SBRK 9
+#define SC_BRK 10
+
+// NOT YET IMPLEMENTED
+#define SC_MMAP 11
+#define SC_MUNMAP 12
+
+#endif
diff --git a/src/kernel/task/idt.cpp b/src/kernel/task/idt.cpp
index 9008083..c09034e 100644
--- a/src/kernel/task/idt.cpp
+++ b/src/kernel/task/idt.cpp
@@ -109,14 +109,6 @@ extern "C" void idt_irqHandler(registers regs) {
if (doSwitch) schedule();
}
-/* Called in idt_.asm on a system call (interrupt 64).
- Calls the correct syscall handler (if any). */
-extern "C" void idt_syscallHandler(registers regs) {
- if (regs.eax < NUMBER_OF_SYSCALLS && syscalls[regs.eax] != 0) {
- syscalls[regs.eax](&regs);
- }
-}
-
/* For internal use only. Sets up an entry of the IDT with given parameters. */
static void idt_setGate(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags) {
idt_entries[num].base_lo = base & 0xFFFF;
diff --git a/src/kernel/task/sched.cpp b/src/kernel/task/sched.cpp
index e773e97..2629a33 100644
--- a/src/kernel/task/sched.cpp
+++ b/src/kernel/task/sched.cpp
@@ -3,7 +3,7 @@
#include <mem/mem.h>
// Lower priority numbers have high priority. Priorities must start at 0.
-#define PRIORITIES 3 // we have 4 priority levels
+#define PRIORITIES 3 // we have 3 priority levels
#define PRIORITY(t) (t->process->privilege) //get priority for a thread
extern thread *idle_thread;
diff --git a/src/kernel/task/syscall.cpp b/src/kernel/task/syscall.cpp
index 7a83c25..7938e76 100644
--- a/src/kernel/task/syscall.cpp
+++ b/src/kernel/task/syscall.cpp
@@ -6,16 +6,16 @@
#define CALL0(name, scname) static void scname(registers* r) { r->eax = name(); }
#define CALL1(name, scname) static void scname(registers* r) { \
- r->eax = name(r->ebx); }
+ r->eax = name(r->ecx); }
#define CALL2(name, scname) static void scname(registers* r) { \
- r->eax = name(r->ebx, r->ecx); }
+ r->eax = name(r->ecx, r->edx); }
#define CALL3(name, scname) static void scname(registers* r) { \
- r->eax = name(r->ebx, r->ecx, r->edx); }
+ r->eax = name(r->ecx, r->edx, r->esi); }
#define CALL0V(name, scname) static void scname(registers* r) { name(); }
-#define CALL1V(name, scname) static void scname(registers* r) { name(r->ebx); }
-#define CALL2V(name, scname) static void scname(registers* r) { name(r->ebx, r->ecx); }
-#define CALL3V(name, scname) static void scname(registers* r) { name(r->ebx, r->ecx, r->edx); }
-#define CALL4V(name, scname) static void scname(registers* r) { name(r->ebx, r->ecx, r->edx, r->esi); }
+#define CALL1V(name, scname) static void scname(registers* r) { name(r->ecx); }
+#define CALL2V(name, scname) static void scname(registers* r) { name(r->ecx, r->edx); }
+#define CALL3V(name, scname) static void scname(registers* r) { name(r->ecx, r->edx, r->esi); }
+#define CALL4V(name, scname) static void scname(registers* r) { name(r->ecx, r->edx, r->esi, r->edi); }
CALL0V(thread_exit, thread_exit_sc);
CALL0V(schedule, schedule_sc);
@@ -27,16 +27,17 @@ CALL1(process_sbrk, proc_sbrk_sc);
CALL1V(process_brk, proc_brk_sc);
static void printk_sc(registers *r) {
- monitor_write((char*)r->ebx);
+ monitor_write((char*)r->ecx);
}
static void thread_new_sc(registers* r) {
cli();
- new thread(current_thread->process, (thread_entry)r->ebx, (void*)r->ecx, (void*)r->edx);
+ new thread(current_thread->process, (thread_entry)r->ecx, (void*)r->edx, (void*)r->esi);
sti();
}
-int_callback syscalls[NUMBER_OF_SYSCALLS] = {
+int_callback syscalls[NUMBER_OF_SYSCALLS] = { // This must correspond to common/include/tce/syscalls.h
+ 0,
thread_exit_sc, //0
schedule_sc,
thread_sleep_sc,
@@ -48,3 +49,16 @@ int_callback syscalls[NUMBER_OF_SYSCALLS] = {
proc_sbrk_sc,
proc_brk_sc,
0 };
+
+
+/* Called in idt_.asm on a system call (interrupt 64).
+ Calls the correct syscall handler (if any). */
+extern "C" void idt_syscallHandler(registers regs) {
+ if (regs.eax == 0) {
+ if (regs.ebx < NUMBER_OF_SYSCALLS && syscalls[regs.ebx] != 0) {
+ syscalls[regs.ebx](&regs);
+ }
+ } else {
+ monitor_write("Hello. Object calls not implemented.\n");
+ }
+}
diff --git a/src/user/lib/include/tce/syscall.h b/src/user/lib/include/tce/syscall.h
index 7cb4381..7bcdd2b 100644
--- a/src/user/lib/include/tce/syscall.h
+++ b/src/user/lib/include/tce/syscall.h
@@ -2,6 +2,7 @@
#define DEF_SYSCALL_H
#include <types.h>
+#include <tce/syscalls.h>
#define NEW_STACK_SIZE 0x8000
diff --git a/src/user/lib/tce/syscall.c b/src/user/lib/tce/syscall.c
index f9243b0..d606491 100644
--- a/src/user/lib/tce/syscall.c
+++ b/src/user/lib/tce/syscall.c
@@ -9,23 +9,23 @@ static size_t call(size_t a, size_t b, size_t c, size_t d, size_t e, size_t f) {
}
void thread_exit() {
- call(0, 0, 0, 0, 0, 0);
+ call(0, SC_THREAD_EXIT, 0, 0, 0, 0);
}
void schedule() {
- call(1, 0, 0,0, 0, 0);
+ call(0, SC_SCHEDULE, 0, 0,0, 0);
}
void thread_sleep(int time) {
- call(2, time, 0, 0, 0, 0);
+ call(0, SC_THREAD_SLEEP, time, 0, 0, 0);
}
void process_exit(int retval) {
- call(3, retval, 0, 0, 0, 0);
+ call(0, SC_PROCESS_EXIT, retval, 0, 0, 0);
}
void printk(char* str) {
- call(4, (unsigned)str, 0, 0, 0, 0);
+ call(0, SC_PRINTK, (unsigned)str, 0, 0, 0);
}
//THREAD CREATION
@@ -44,28 +44,28 @@ void thread_start(void *data) {
if (_stack_to_free != 0) free(_stack_to_free);
_stack_to_free = tsd->stack;
asm volatile("movl %0, (_stack_freeing_mutex); int $64;" ::
- "a"(0), "r"(MUTEX_UNLOCKED));
+ "a"(0), "b"(SC_THREAD_EXIT), "r"(MUTEX_UNLOCKED));
}
void thread_new(void (*entry)(void*), void *data) {
struct thread_start_data *tsd = malloc(sizeof(struct thread_start_data));
tsd->entry = entry;
tsd->data = data;
tsd->stack = malloc(NEW_STACK_SIZE);
- call(5, (unsigned)thread_start, (unsigned)tsd, (unsigned)(tsd->stack + NEW_STACK_SIZE), 0, 0);
+ call(0, SC_THREAD_NEW, (unsigned)thread_start, (unsigned)tsd, (unsigned)(tsd->stack + NEW_STACK_SIZE), 0);
}
void irq_wait(int number) {
- call(6, number, 0, 0, 0, 0);
+ call(0, SC_IRQ_WAIT, number, 0, 0, 0);
}
int proc_priv() {
- return call(7, 0, 0, 0, 0, 0);
+ return call(0, SC_PROC_PRIV, 0, 0, 0, 0);
}
void* sbrk(size_t s) {
- return (void*)call(8, s, 0, 0, 0, 0);
+ return (void*)call(0, SC_SBRK, s, 0, 0, 0);
}
void brk(void* ptr) {
- return call (9, ptr, 0, 0, 0, 0);
+ return call (0, SC_BRK, ptr, 0, 0, 0);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 17:11:28 +0000