Begin implementation of syscalls.

1 files changed, 64 insertions, 0 deletions

diff --git a/src/kernel/user/syscall.c b/src/kernel/user/syscall.c
new file mode 100644
index 0000000..563957c
--- /dev/null
+++ b/src/kernel/user/syscall.c
@@ -0,0 +1,64 @@
+#include <string.h>
+#include <process.h>
+#include <vfs.h>
+
+#include <syscall.h>
+
+typedef uint32_t (*syscall_handler_t)(uint32_t, uint32_t, uint32_t, uint32_t, uint32_t);
+
+static syscall_handler_t sc_handlers[SC_MAX] = { 0 };
+
+// ==================== //
+// THE SYSCALLS CODE !! //
+// ==================== //
+
+static uint32_t exit_sc(uint32_t code, uint32_t uu1, uint32_t uu2, uint32_t uu3, uint32_t uu4) {
+	dbg_printf("Proc %d exit with code %d\n", proc_pid(current_process()), code);
+	// TODO : use code... and process exiting is not supposed to be done this way
+
+	exit();
+	return 0;
+}
+
+static uint32_t yield_sc() {
+	yield();
+	return 0;
+}
+
+static uint32_t dbg_print_sc(uint32_t x, uint32_t uu1, uint32_t uu2, uint32_t uu3, uint32_t uu4) {
+	const char* addr = (const char*)x;
+	probe_for_read(addr, 256);
+
+	char buf[256];
+	memcpy(buf, addr, 256);
+	buf[255] = 0;
+
+	dbg_print(buf);
+
+	return 0;
+}
+
+// ====================== //
+// SYSCALLS SETUP ROUTINE //
+// ====================== //
+
+void setup_syscalls() {
+	sc_handlers[SC_EXIT] = exit_sc;
+	sc_handlers[SC_YIELD] = yield_sc;
+	sc_handlers[SC_DBG_PRINT] = dbg_print_sc;
+}
+
+void syscall_handler(registers_t *regs) {
+	ASSERT(regs->int_no == 64);
+
+	if (regs->eax < SC_MAX) {
+		syscall_handler_t h = sc_handlers[regs->eax];
+		if (h != 0) {
+			regs->eax = h(regs->ebx, regs->ecx, regs->edx, regs->esi, regs->edi);
+		} else {
+			regs->eax = -1;
+		}
+	}
+}
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/