From d70e2dc61068bdc12e404fc4980220214421801b Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sun, 14 Dec 2025 20:47:41 +0100
Subject: [PATCH] drm: Use new VERSION, GET_CAP and SET_CLIENT_CAP driver
 commands

---
 src/header/sys_ioctl/redox/drm.rs          | 69 ++++++++++++++++++----
 src/header/sys_ioctl/redox/graphics_ipc.rs | 30 ++++++++++
 2 files changed, 88 insertions(+), 11 deletions(-)

diff --git a/src/header/sys_ioctl/redox/drm.rs b/src/header/sys_ioctl/redox/drm.rs
index 78933b4f21..5c1b5c707a 100644
--- a/src/header/sys_ioctl/redox/drm.rs
+++ b/src/header/sys_ioctl/redox/drm.rs
@@ -65,6 +65,41 @@ impl Dev {
         )
     }
 
+    fn version(&self) -> Result<ipc::Version> {
+        let mut cmd = ipc::Version {
+            version_major: 0,
+            version_minor: 0,
+            version_patchlevel: 0,
+            name_len: 0,
+            name: [0; 16],
+            desc_len: 0,
+            desc: [0; 16],
+        };
+        unsafe {
+            self.call(&mut cmd, ipc::VERSION)?;
+        }
+        Ok(cmd)
+    }
+
+    fn get_cap(&self, capability: u64) -> Result<u64> {
+        let mut cmd = ipc::GetCap {
+            capability,
+            value: 0,
+        };
+        unsafe {
+            self.call(&mut cmd, ipc::GET_CAP)?;
+        }
+        Ok(cmd.value)
+    }
+
+    fn set_client_cap(&self, capability: u64, value: u64) -> Result<()> {
+        let mut cmd = ipc::SetClientCap { capability, value };
+        unsafe {
+            self.call(&mut cmd, ipc::SET_CLIENT_CAP)?;
+        }
+        Ok(())
+    }
+
     fn display_count(&self) -> Result<usize> {
         let mut cmd = ipc::DisplayCount { count: 0 };
         unsafe {
@@ -104,12 +139,21 @@ struct drm_version {
 
 unsafe fn version(dev: Dev, mut buf: IoctlBuffer) -> Result<c_int> {
     let mut vers = buf.read::<drm_version>()?;
-    vers.version_major = 1;
-    vers.version_minor = 0;
-    vers.version_patchlevel = 0;
-    vers.name_len = copy_array("redox".as_bytes(), vers.name as *mut u8, vers.name_len);
+    let version = dev.version()?;
+    vers.version_major = version.version_major as i32;
+    vers.version_minor = version.version_minor as i32;
+    vers.version_patchlevel = version.version_patchlevel as i32;
+    vers.name_len = copy_array(
+        &version.name[..version.name_len],
+        vers.name as *mut u8,
+        vers.name_len,
+    );
     vers.date_len = copy_array("0".as_bytes(), vers.date as *mut u8, vers.date_len);
-    vers.desc_len = copy_array("Redox OS".as_bytes(), vers.desc as *mut u8, vers.desc_len);
+    vers.desc_len = copy_array(
+        &version.desc[..version.desc_len],
+        vers.desc as *mut u8,
+        vers.desc_len,
+    );
     buf.write(vers)?;
     Ok(0)
 }
@@ -121,9 +165,11 @@ pub struct drm_get_cap {
     pub value: u64,
 }
 
-unsafe fn get_cap(dev: Dev, buf: IoctlBuffer) -> Result<c_int> {
-    //TODO: get capabilities
-    Err(Errno(EINVAL))
+unsafe fn get_cap(dev: Dev, mut buf: IoctlBuffer) -> Result<c_int> {
+    let mut cap = buf.read::<drm_get_cap>()?;
+    cap.value = dev.get_cap(cap.capability)?;
+    buf.write(cap)?;
+    Ok(0)
 }
 
 #[repr(C)]
@@ -133,9 +179,10 @@ pub struct drm_set_client_cap {
     pub value: u64,
 }
 
-unsafe fn set_client_cap(dev: Dev, buf: IoctlBuffer) -> Result<c_int> {
-    //TODO: set capabilities
-    Err(Errno(EINVAL))
+unsafe fn set_client_cap(dev: Dev, mut buf: IoctlBuffer) -> Result<c_int> {
+    let mut cap = buf.read::<drm_set_client_cap>()?;
+    dev.set_client_cap(cap.capability, cap.value)?;
+    Ok(0)
 }
 
 #[repr(C)]
diff --git a/src/header/sys_ioctl/redox/graphics_ipc.rs b/src/header/sys_ioctl/redox/graphics_ipc.rs
index 51d886481f..517fe6e8b6 100644
--- a/src/header/sys_ioctl/redox/graphics_ipc.rs
+++ b/src/header/sys_ioctl/redox/graphics_ipc.rs
@@ -8,6 +8,36 @@ pub struct Damage {
     pub height: u32,
 }
 
+pub const VERSION: u64 = 0;
+#[repr(C, packed)]
+pub struct Version {
+    pub version_major: u32,
+    pub version_minor: u32,
+    pub version_patchlevel: u32,
+    // FIXME allow variable sized fields
+    pub name_len: usize,
+    pub name: [u8; 16],
+    pub desc_len: usize,
+    pub desc: [u8; 16],
+}
+
+pub const GET_CAP: u64 = 0x0C;
+pub const CAP_DUMB_BUFFER: u64 = 0x1;
+#[repr(C, packed)]
+pub struct GetCap {
+    pub capability: u64,
+    pub value: u64,
+}
+
+pub const SET_CLIENT_CAP: u64 = 0x0D;
+pub const CLIENT_CAP_CURSOR_PLANE_HOTSPOT: u64 = 6;
+#[repr(C, packed)]
+pub struct SetClientCap {
+    pub capability: u64,
+    pub value: u64,
+}
+
+// FIXME replace these with proper drm interfaces
 pub const DISPLAY_COUNT: u64 = 1;
 #[repr(C, packed)]
 pub struct DisplayCount {