Justus Winter, on Sun 28 Feb 2016 00:33:21 +0100, wrote: > * i386/Makefrag.am (libkernel_a_SOURCES): Add new file. > * i386/i386/cpu.h: New file.
Ack, thanks. > --- > i386/Makefrag.am | 1 + > i386/i386/cpu.h | 110 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 111 insertions(+) > create mode 100644 i386/i386/cpu.h > > diff --git a/i386/Makefrag.am b/i386/Makefrag.am > index 0c5faa3..4e56543 100644 > --- a/i386/Makefrag.am > +++ b/i386/Makefrag.am > @@ -97,6 +97,7 @@ libkernel_a_SOURCES += \ > i386/i386/ast.h \ > i386/i386/ast_check.c \ > i386/i386/ast_types.h \ > + i386/i386/cpu.h \ > i386/i386/cpu_number.h \ > i386/i386/cswitch.S \ > i386/i386/db_disasm.c \ > diff --git a/i386/i386/cpu.h b/i386/i386/cpu.h > new file mode 100644 > index 0000000..1bf40dc > --- /dev/null > +++ b/i386/i386/cpu.h > @@ -0,0 +1,110 @@ > +/* > + * Copyright (c) 2010-2014 Richard Braun. > + * > + * 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 this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#ifndef _X86_CPU_H > +#define _X86_CPU_H > + > +#include <kern/macros.h> > + > +/* > + * EFLAGS register flags. > + */ > +#define CPU_EFL_ONE 0x00000002 > +#define CPU_EFL_IF 0x00000200 > + > +/* > + * Return the content of the EFLAGS register. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline unsigned long > +cpu_get_eflags(void) > +{ > + unsigned long eflags; > + > + asm volatile("pushf\n" > + "pop %0\n" > + : "=r" (eflags) > + : : "memory"); > + > + return eflags; > +} > + > +/* > + * Enable local interrupts. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline void > +cpu_intr_enable(void) > +{ > + asm volatile("sti" : : : "memory"); > +} > + > +/* > + * Disable local interrupts. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline void > +cpu_intr_disable(void) > +{ > + asm volatile("cli" : : : "memory"); > +} > + > +/* > + * Restore the content of the EFLAGS register, possibly enabling interrupts. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline void > +cpu_intr_restore(unsigned long flags) > +{ > + asm volatile("push %0\n" > + "popf\n" > + : : "r" (flags) > + : "memory"); > +} > + > +/* > + * Disable local interrupts, returning the previous content of the EFLAGS > + * register. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline void > +cpu_intr_save(unsigned long *flags) > +{ > + *flags = cpu_get_eflags(); > + cpu_intr_disable(); > +} > + > +/* > + * Return true if interrupts are enabled. > + * > + * Implies a compiler barrier. > + */ > +static __always_inline int > +cpu_intr_enabled(void) > +{ > + unsigned long eflags; > + > + eflags = cpu_get_eflags(); > + return (eflags & CPU_EFL_IF) ? 1 : 0; > +} > + > +#endif /* _X86_CPU_H */ > -- > 2.1.4 > -- Samuel <c> xlnt comme sujet de stage je peux essayer de donner une description formelle de automake -+- #ens-mim -+-
