From f69c8e8cb4feb81b3923d869a2f529b2b4d58c1c Mon Sep 17 00:00:00 2001 From: Red Bear OS Date: Thu, 11 Jun 2026 02:07:44 +0300 Subject: [PATCH] add sys/ioccom.h for DRM UAPI ioctl encoding --- include/sys/ioccom.h | 63 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 include/sys/ioccom.h diff --git a/include/sys/ioccom.h b/include/sys/ioccom.h new file mode 100644 index 0000000..4722557 --- /dev/null +++ b/include/sys/ioccom.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Linux UAPI asm-generic/ioctl.h — ioctl command encoding macros. + * Required by DRM UAPI headers (drm-uapi/drm.h, drm-uapi/sync_file.h) + * which include for _IO/_IOR/_IOW/_IOWR. + * + * On glibc/musl this is provided by the libc. On Redox (relibc) it + * is not, because ioctl direction encoding is a Linux UAPI convention + * rather than a POSIX requirement. + * + * This header is a pure compile-time macro encoding; the values never + * reach a real ioctl(2) syscall on Redox. The DRM dispatch surface + * (libdrm's drmIoctl -> scheme:drm/SchemeSync in + * local/sources/redox-drm/) is the runtime source of truth, and it + * uses different encoding internally. + */ +#ifndef _SYS_IOCCOM_H +#define _SYS_IOCCOM_H + +#define _IOC_NRBITS 8 +#define _IOC_TYPEBITS 8 +#define _IOC_SIZEBITS 14 +#define _IOC_DIRBITS 2 + +#define _IOC_NRMASK ((1 << _IOC_NRBITS) - 1) +#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS) - 1) +#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS) - 1) +#define _IOC_DIRMASK ((1 << _IOC_DIRBITS) - 1) + +#define _IOC_NRSHIFT 0 +#define _IOC_TYPESHIFT (_IOC_NRSHIFT + _IOC_NRBITS) +#define _IOC_SIZESHIFT (_IOC_TYPESHIFT + _IOC_TYPEBITS) +#define _IOC_DIRSHIFT (_IOC_SIZESHIFT + _IOC_SIZEBITS) + +#define _IOC_NONE 0U +#define _IOC_WRITE 1U +#define _IOC_READ 2U + +#define _IOC(dir, type, nr, size) \ + (((dir) << _IOC_DIRSHIFT) | \ + ((type) << _IOC_TYPESHIFT) | \ + ((nr) << _IOC_NRSHIFT) | \ + ((size) << _IOC_SIZESHIFT)) + +#define _IOC_TYPECHECK(t) (sizeof(t)) + +#define _IO(type, nr) _IOC(_IOC_NONE, (type), (nr), 0) +#define _IOR(type, nr, argtype) _IOC(_IOC_READ, (type), (nr), (_IOC_TYPECHECK(argtype))) +#define _IOW(type, nr, argtype) _IOC(_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(argtype))) +#define _IOWR(type, nr, argtype) _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(argtype))) + +#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) +#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) +#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) +#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) + +#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) +#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) +#define IOC_INOUT ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT) +#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) +#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) + +#endif /* _SYS_IOCCOM_H */ -- 2.54.0