| Message ID | 20190919232952.6382-3-richard.henderson@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | exec: Improve code for TARGET_PAGE_BITS_VARY | expand |
On 9/20/19 1:29 AM, Richard Henderson wrote: > The next patch will play a trick with "const" that will > confuse the compiler about the uses of target_page_bits > within exec.c. Moving everything to a new file prevents > this confusion. > > No functional change so far. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > Makefile.target | 2 +- > include/qemu-common.h | 6 +++++ > exec-vary.c | 57 +++++++++++++++++++++++++++++++++++++++++++ > exec.c | 34 -------------------------- > 4 files changed, 64 insertions(+), 35 deletions(-) > create mode 100644 exec-vary.c > > diff --git a/Makefile.target b/Makefile.target > index 5e916230c4..ca3d14efe1 100644 > --- a/Makefile.target > +++ b/Makefile.target > @@ -107,7 +107,7 @@ obj-y += trace/ > > ######################################################### > # cpu emulator library > -obj-y += exec.o > +obj-y += exec.o exec-vary.o > obj-y += accel/ > obj-$(CONFIG_TCG) += tcg/tcg.o tcg/tcg-op.o tcg/tcg-op-vec.o tcg/tcg-op-gvec.o > obj-$(CONFIG_TCG) += tcg/tcg-common.o tcg/optimize.o > diff --git a/include/qemu-common.h b/include/qemu-common.h > index 0235cd3b91..3e800c2224 100644 > --- a/include/qemu-common.h > +++ b/include/qemu-common.h > @@ -74,6 +74,12 @@ void cpu_exec_step_atomic(CPUState *cpu); > */ > bool set_preferred_target_page_bits(int bits); > > +/** > + * finalize_target_page_bits: > + * Commit the final value set by set_preferred_target_page_bits. > + */ > +void finalize_target_page_bits(void); > + > /** > * Sends a (part of) iovec down a socket, yielding when the socket is full, or > * Receives data into a (part of) iovec from a socket, > diff --git a/exec-vary.c b/exec-vary.c > new file mode 100644 > index 0000000000..48c0ab306c > --- /dev/null > +++ b/exec-vary.c > @@ -0,0 +1,57 @@ > +/* > + * Variable page size handling > + * > + * Copyright (c) 2003 Fabrice Bellard > + * > + * This library is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2 of the License, or (at your option) any later version. > + * > + * This library 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 > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with this library; if not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include "qemu/osdep.h" > +#include "qemu-common.h" > +#include "exec/exec-all.h" > + > +#ifdef TARGET_PAGE_BITS_VARY > +int target_page_bits; > +bool target_page_bits_decided; > +#endif > + > +bool set_preferred_target_page_bits(int bits) > +{ > + /* > + * The target page size is the lowest common denominator for all > + * the CPUs in the system, so we can only make it smaller, never > + * larger. And we can't make it smaller once we've committed to > + * a particular size. > + */ > +#ifdef TARGET_PAGE_BITS_VARY > + assert(bits >= TARGET_PAGE_BITS_MIN); > + if (target_page_bits == 0 || target_page_bits > bits) { > + if (target_page_bits_decided) { > + return false; > + } > + target_page_bits = bits; > + } > +#endif > + return true; > +} > + > +void finalize_target_page_bits(void) > +{ > +#ifdef TARGET_PAGE_BITS_VARY > + if (target_page_bits == 0) { > + target_page_bits = TARGET_PAGE_BITS_MIN; > + } > + target_page_bits_decided = true; > +#endif > +} > diff --git a/exec.c b/exec.c > index 8b998974f8..33bd0e36c1 100644 > --- a/exec.c > +++ b/exec.c > @@ -92,11 +92,6 @@ MemoryRegion io_mem_rom, io_mem_notdirty; > static MemoryRegion io_mem_unassigned; > #endif > > -#ifdef TARGET_PAGE_BITS_VARY > -int target_page_bits; > -bool target_page_bits_decided; > -#endif > - > CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus); > > /* current CPU in the current thread. It is only valid inside > @@ -110,37 +105,8 @@ int use_icount; > uintptr_t qemu_host_page_size; > intptr_t qemu_host_page_mask; > > -bool set_preferred_target_page_bits(int bits) > -{ > - /* The target page size is the lowest common denominator for all > - * the CPUs in the system, so we can only make it smaller, never > - * larger. And we can't make it smaller once we've committed to > - * a particular size. > - */ > -#ifdef TARGET_PAGE_BITS_VARY > - assert(bits >= TARGET_PAGE_BITS_MIN); > - if (target_page_bits == 0 || target_page_bits > bits) { > - if (target_page_bits_decided) { > - return false; > - } > - target_page_bits = bits; > - } > -#endif > - return true; > -} > - > #if !defined(CONFIG_USER_ONLY) > > -static void finalize_target_page_bits(void) > -{ > -#ifdef TARGET_PAGE_BITS_VARY > - if (target_page_bits == 0) { > - target_page_bits = TARGET_PAGE_BITS_MIN; > - } > - target_page_bits_decided = true; > -#endif > -} > - > typedef struct PhysPageEntry PhysPageEntry; > > struct PhysPageEntry { > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
diff --git a/Makefile.target b/Makefile.target index 5e916230c4..ca3d14efe1 100644 --- a/Makefile.target +++ b/Makefile.target @@ -107,7 +107,7 @@ obj-y += trace/ ######################################################### # cpu emulator library -obj-y += exec.o +obj-y += exec.o exec-vary.o obj-y += accel/ obj-$(CONFIG_TCG) += tcg/tcg.o tcg/tcg-op.o tcg/tcg-op-vec.o tcg/tcg-op-gvec.o obj-$(CONFIG_TCG) += tcg/tcg-common.o tcg/optimize.o diff --git a/include/qemu-common.h b/include/qemu-common.h index 0235cd3b91..3e800c2224 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -74,6 +74,12 @@ void cpu_exec_step_atomic(CPUState *cpu); */ bool set_preferred_target_page_bits(int bits); +/** + * finalize_target_page_bits: + * Commit the final value set by set_preferred_target_page_bits. + */ +void finalize_target_page_bits(void); + /** * Sends a (part of) iovec down a socket, yielding when the socket is full, or * Receives data into a (part of) iovec from a socket, diff --git a/exec-vary.c b/exec-vary.c new file mode 100644 index 0000000000..48c0ab306c --- /dev/null +++ b/exec-vary.c @@ -0,0 +1,57 @@ +/* + * Variable page size handling + * + * Copyright (c) 2003 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "exec/exec-all.h" + +#ifdef TARGET_PAGE_BITS_VARY +int target_page_bits; +bool target_page_bits_decided; +#endif + +bool set_preferred_target_page_bits(int bits) +{ + /* + * The target page size is the lowest common denominator for all + * the CPUs in the system, so we can only make it smaller, never + * larger. And we can't make it smaller once we've committed to + * a particular size. + */ +#ifdef TARGET_PAGE_BITS_VARY + assert(bits >= TARGET_PAGE_BITS_MIN); + if (target_page_bits == 0 || target_page_bits > bits) { + if (target_page_bits_decided) { + return false; + } + target_page_bits = bits; + } +#endif + return true; +} + +void finalize_target_page_bits(void) +{ +#ifdef TARGET_PAGE_BITS_VARY + if (target_page_bits == 0) { + target_page_bits = TARGET_PAGE_BITS_MIN; + } + target_page_bits_decided = true; +#endif +} diff --git a/exec.c b/exec.c index 8b998974f8..33bd0e36c1 100644 --- a/exec.c +++ b/exec.c @@ -92,11 +92,6 @@ MemoryRegion io_mem_rom, io_mem_notdirty; static MemoryRegion io_mem_unassigned; #endif -#ifdef TARGET_PAGE_BITS_VARY -int target_page_bits; -bool target_page_bits_decided; -#endif - CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus); /* current CPU in the current thread. It is only valid inside @@ -110,37 +105,8 @@ int use_icount; uintptr_t qemu_host_page_size; intptr_t qemu_host_page_mask; -bool set_preferred_target_page_bits(int bits) -{ - /* The target page size is the lowest common denominator for all - * the CPUs in the system, so we can only make it smaller, never - * larger. And we can't make it smaller once we've committed to - * a particular size. - */ -#ifdef TARGET_PAGE_BITS_VARY - assert(bits >= TARGET_PAGE_BITS_MIN); - if (target_page_bits == 0 || target_page_bits > bits) { - if (target_page_bits_decided) { - return false; - } - target_page_bits = bits; - } -#endif - return true; -} - #if !defined(CONFIG_USER_ONLY) -static void finalize_target_page_bits(void) -{ -#ifdef TARGET_PAGE_BITS_VARY - if (target_page_bits == 0) { - target_page_bits = TARGET_PAGE_BITS_MIN; - } - target_page_bits_decided = true; -#endif -} - typedef struct PhysPageEntry PhysPageEntry; struct PhysPageEntry {
The next patch will play a trick with "const" that will confuse the compiler about the uses of target_page_bits within exec.c. Moving everything to a new file prevents this confusion. No functional change so far. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- Makefile.target | 2 +- include/qemu-common.h | 6 +++++ exec-vary.c | 57 +++++++++++++++++++++++++++++++++++++++++++ exec.c | 34 -------------------------- 4 files changed, 64 insertions(+), 35 deletions(-) create mode 100644 exec-vary.c -- 2.17.1