From 5e0b8d508ed51004bd836384293be00950ee62c9 Mon Sep 17 00:00:00 2001 From: Pasha Date: Tue, 20 Feb 2024 18:49:50 +0000 Subject: init gnumach copy --- xen/ring.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 xen/ring.h (limited to 'xen/ring.h') diff --git a/xen/ring.h b/xen/ring.h new file mode 100644 index 0000000..1ac8b37 --- /dev/null +++ b/xen/ring.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2006-2009 Free Software Foundation + * + * This program is free software ; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation ; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY ; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the program ; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef XEN_RING_H +#define XEN_RING_H + +typedef uint32_t hyp_ring_pos_t; + +#define hyp_ring_idx(ring, pos) (((unsigned)(pos)) & (sizeof(ring)-1)) +#define hyp_ring_cell(ring, pos) (ring)[hyp_ring_idx((ring), (pos))] +#define hyp_ring_smash(ring, prod, cons) (hyp_ring_idx((ring), (prod) + 1) == \ + hyp_ring_idx((ring), (cons))) +#define hyp_ring_available(ring, prod, cons) hyp_ring_idx((ring), (cons)-(prod)-1) + +void hyp_ring_store(void *dest, const void *src, size_t size, void *start, void *end); +void hyp_ring_fetch(void *dest, const void *src, size_t size, void *start, void *end); +size_t hyp_ring_next_word(char **c, void *start, void *end); + +#endif /* XEN_RING_H */ -- cgit v1.2.1