sched interface completion

Author: zhanghe-vivo

header/src/lib.rs

@@ -84,6 +84,9 @@ pub mod syscalls {
         MqTimedReceive,
         MqGetSetAttr,
         Ioctl,
+        SchedGetPriorityMax,
+        SchedGetPriorityMin,
+        SchedRrGetInterval,
         LastNR,
     }
 }

kernel/src/syscall_handlers/mod.rs

@@ -41,6 +41,7 @@ use libc::{
     sigset_t, size_t, sockaddr, socklen_t, timespec, EBUSY, EINVAL, ESRCH,
 };
 
+pub const SCHED_RR: c_int = 1;
 #[cfg(not(enable_vfs))]
 mod vfs_syscalls {
     use super::*;
@@ -505,6 +506,39 @@ define_syscall_handler!(sched_yield() -> c_long {
     scheduler::yield_me();
     0
 });
+
+define_syscall_handler!(sched_get_priority_max(policy: c_int) -> c_long {
+    // Only SCHED_RR is supported.
+    if policy != SCHED_RR {
+        return -(libc::EINVAL as c_long);
+    }
+    config::MAX_THREAD_PRIORITY as c_long
+});
+
+define_syscall_handler!(sched_get_priority_min(policy: c_int) -> c_long {
+    // Only SCHED_RR is supported.
+    if policy != SCHED_RR {
+        return -(libc::EINVAL as c_long);
+    }
+    0
+});
+
+define_syscall_handler!(sched_rr_get_interval(pid: c_int, interval: *mut timespec) -> c_long {
+    let _ = pid;
+    if interval.is_null() {
+        return -(libc::EINVAL as c_long);
+    }
+
+    unsafe {
+        (*interval).tv_sec = 0;
+        let ns: i64 = (time::tick_to_millisecond(blueos_kconfig::CONFIG_ROBIN_SLICE as usize)
+            as i64)
+            .saturating_mul(1_000_000);
+        let clamped: i64 = core::cmp::min(ns, 999_999_999);
+        (*interval).tv_nsec = clamped as c_int;
+    }
+    0
+});
 define_syscall_handler!(
     rmdir(path: *const c_char) -> c_int {
         vfs_syscalls::rmdir(path)
@@ -896,6 +930,9 @@ syscall_table! {
     (MqTimedReceive, mq_timedreceive),
     (MqGetSetAttr, mq_getsetattr),
     (Ioctl, ioctl),
+    (SchedGetPriorityMax, sched_get_priority_max),
+    (SchedGetPriorityMin, sched_get_priority_min),
+    (SchedRrGetInterval, sched_rr_get_interval),
 }
 
 #[cfg(not(enable_syscall))]