diff options
| -rw-r--r-- | sys/i386/isa/ipl_funcs.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/sys/i386/isa/ipl_funcs.c b/sys/i386/isa/ipl_funcs.c new file mode 100644 index 0000000..fa3136a --- /dev/null +++ b/sys/i386/isa/ipl_funcs.c @@ -0,0 +1,94 @@ +/*- + * Copyright (c) 1997 Bruce Evans. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ + +#include <sys/types.h> +#include <sys/systm.h> +#include <machine/ipl.h> + +/* + * The volatile bitmap variables must be set atomically. This normally + * involves using a machine-dependent bit-set or `or' instruction. + */ + +#define DO_SETBITS(name, var, bits) \ +void name(void) \ +{ \ + setbits(var, bits); \ +} + +DO_SETBITS(setdelayed, &ipending, loadandclear((unsigned *)&idelayed)) +DO_SETBITS(setsoftast, &ipending, SWI_AST_PENDING) +DO_SETBITS(setsoftclock, &ipending, SWI_CLOCK_PENDING) +DO_SETBITS(setsoftnet, &ipending, SWI_NET_PENDING) +DO_SETBITS(setsofttty, &ipending, SWI_TTY_PENDING) + +DO_SETBITS(schedsoftnet, &idelayed, SWI_NET_PENDING) +DO_SETBITS(schedsofttty, &idelayed, SWI_TTY_PENDING) + +unsigned +softclockpending(void) +{ + return (ipending & SWI_CLOCK_PENDING); +} + +#define GENSPL(name, set_cpl) \ +unsigned name(void) \ +{ \ + unsigned x; \ + \ + x = cpl; \ + set_cpl; \ + return (x); \ +} + +GENSPL(splbio, cpl |= bio_imask) +GENSPL(splclock, cpl = HWI_MASK | SWI_MASK) +GENSPL(splhigh, cpl = HWI_MASK | SWI_MASK) +GENSPL(splimp, cpl |= net_imask) +GENSPL(splnet, cpl |= SWI_NET_MASK) +GENSPL(splsoftclock, cpl = SWI_CLOCK_MASK) +GENSPL(splsofttty, cpl |= SWI_TTY_MASK) +GENSPL(splstatclock, cpl |= stat_imask) +GENSPL(spltty, cpl |= tty_imask) +GENSPL(splvm, cpl |= net_imask | bio_imask) + +void +spl0(void) +{ + cpl = SWI_AST_MASK; + if (ipending & ~SWI_AST_MASK) + splz(); +} + +void +splx(unsigned ipl) +{ + cpl = ipl; + if (ipending & ~ipl) + splz(); +} |
