mirror of https://gitee.com/openkylin/linux.git
RISC-V Patches for the 4.20 Merge Window, Part 2 v2
This tag contains the follow-on patches I'd like to target for the 4.20
merge window. I'm being somewhat conservative here, as while there are
a few patches on the mailing list that were posted early in the merge
window I'd like to let those bake for another round -- this was a fairly
big release as far as RISC-V is concerened, and we need to walk before
we can run.
As far as the patches that made it go:
* A patch to ignore offline CPUs when calculating AT_HWCAP. This should
fix GDB on the HiFive unleashed, which has an embedded core for hart
0 which is exposed to Linux as an offline CPU.
* A move of EM_RISCV to elf-em.h, which is where it should have been to
begin with.
* I've also removed the 64-bit divide routines. I know I'm not really
playing by my own rules here because I posted the patches this
morning, but since they shouldn't be in the kernel I think it's better
to err on the side of going too fast here.
I don't anticipate any more patch sets for the merge window.
Changes since v1:
* Use a consistent base to merge from so the history isn't a mess.
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Merge tag 'riscv-for-linus-4.20-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux
Pull more RISC-V updates from Palmer Dabbelt:
"This contains the follow-on patches I'd like to target for the 4.20
merge window. I'm being somewhat conservative here, as while there are
a few patches on the mailing list that were posted early in the merge
window I'd like to let those bake for another round -- this was a
fairly big release as far as RISC-V is concerened, and we need to walk
before we can run.
As far as the patches that made it go:
- A patch to ignore offline CPUs when calculating AT_HWCAP. This
should fix GDB on the HiFive unleashed, which has an embedded core
for hart 0 which is exposed to Linux as an offline CPU.
- A move of EM_RISCV to elf-em.h, which is where it should have been
to begin with.
- I've also removed the 64-bit divide routines. I know I'm not really
playing by my own rules here because I posted the patches this
morning, but since they shouldn't be in the kernel I think it's
better to err on the side of going too fast here.
I don't anticipate any more patch sets for the merge window"
* tag 'riscv-for-linus-4.20-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
Move EM_RISCV into elf-em.h
RISC-V: properly determine hardware caps
Revert "lib: Add umoddi3 and udivmoddi4 of GCC library routines"
Revert "RISC-V: Select GENERIC_LIB_UMODDI3 on RV32"
This commit is contained in:
Linus Torvalds
commit
3dca04d694
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@ -107,7 +107,6 @@ config ARCH_RV32I
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select GENERIC_LIB_ASHRDI3
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select GENERIC_LIB_ASHRDI3
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select GENERIC_LIB_LSHRDI3
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select GENERIC_LIB_LSHRDI3
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select GENERIC_LIB_UCMPDI2
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select GENERIC_LIB_UCMPDI2
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select GENERIC_LIB_UMODDI3
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config ARCH_RV64I
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config ARCH_RV64I
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bool "RV64I"
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bool "RV64I"
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@ -16,9 +16,6 @@
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#include <asm/auxvec.h>
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#include <asm/auxvec.h>
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#include <asm/byteorder.h>
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#include <asm/byteorder.h>
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/* TODO: Move definition into include/uapi/linux/elf-em.h */
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#define EM_RISCV 0xF3
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/*
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/*
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* These are used to set parameters in the core dumps.
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* These are used to set parameters in the core dumps.
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*/
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*/
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@ -28,7 +28,7 @@ bool has_fpu __read_mostly;
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void riscv_fill_hwcap(void)
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void riscv_fill_hwcap(void)
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{
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{
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struct device_node *node;
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struct device_node *node = NULL;
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const char *isa;
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const char *isa;
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size_t i;
|
size_t i;
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static unsigned long isa2hwcap[256] = {0};
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static unsigned long isa2hwcap[256] = {0};
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@ -44,9 +44,11 @@ void riscv_fill_hwcap(void)
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/*
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/*
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* We don't support running Linux on hertergenous ISA systems. For
|
* We don't support running Linux on hertergenous ISA systems. For
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* now, we just check the ISA of the first processor.
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* now, we just check the ISA of the first "okay" processor.
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*/
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*/
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node = of_find_node_by_type(NULL, "cpu");
|
while ((node = of_find_node_by_type(node, "cpu")))
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|
if (riscv_of_processor_hartid(node) >= 0)
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|
break;
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if (!node) {
|
if (!node) {
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pr_warning("Unable to find \"cpu\" devicetree entry");
|
pr_warning("Unable to find \"cpu\" devicetree entry");
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return;
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return;
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@ -41,6 +41,7 @@
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#define EM_TILEPRO 188 /* Tilera TILEPro */
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#define EM_TILEPRO 188 /* Tilera TILEPro */
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#define EM_MICROBLAZE 189 /* Xilinx MicroBlaze */
|
#define EM_MICROBLAZE 189 /* Xilinx MicroBlaze */
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#define EM_TILEGX 191 /* Tilera TILE-Gx */
|
#define EM_TILEGX 191 /* Tilera TILE-Gx */
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|
#define EM_RISCV 243 /* RISC-V */
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#define EM_BPF 247 /* Linux BPF - in-kernel virtual machine */
|
#define EM_BPF 247 /* Linux BPF - in-kernel virtual machine */
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#define EM_FRV 0x5441 /* Fujitsu FR-V */
|
#define EM_FRV 0x5441 /* Fujitsu FR-V */
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@ -624,6 +624,3 @@ config GENERIC_LIB_CMPDI2
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config GENERIC_LIB_UCMPDI2
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config GENERIC_LIB_UCMPDI2
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bool
|
bool
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config GENERIC_LIB_UMODDI3
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bool
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@ -274,4 +274,3 @@ obj-$(CONFIG_GENERIC_LIB_LSHRDI3) += lshrdi3.o
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obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
|
obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
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obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
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obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
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obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
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obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
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obj-$(CONFIG_GENERIC_LIB_UMODDI3) += umoddi3.o udivmoddi4.o
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|
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310
lib/udivmoddi4.c
310
lib/udivmoddi4.c
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|
@ -1,310 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
|
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|
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/*
|
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* This program is free software; you can redistribute it and/or modify
|
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||||||
* it under the terms of the GNU General Public License as published by
|
|
||||||
* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
|
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*
|
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
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* 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
|
|
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* along with this program; if not, see the file COPYING, or write
|
|
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* to the Free Software Foundation, Inc.
|
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*/
|
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|
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#include <linux/libgcc.h>
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|
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#define count_leading_zeros(COUNT, X) ((COUNT) = __builtin_clz(X))
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|
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#define W_TYPE_SIZE 32
|
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|
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#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
|
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#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
|
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#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
|
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|
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/* If we still don't have umul_ppmm, define it using plain C. */
|
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#if !defined(umul_ppmm)
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#define umul_ppmm(w1, w0, u, v) \
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do { \
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unsigned long __x0, __x1, __x2, __x3; \
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unsigned short __ul, __vl, __uh, __vh; \
|
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\
|
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__ul = __ll_lowpart(u); \
|
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__uh = __ll_highpart(u); \
|
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__vl = __ll_lowpart(v); \
|
|
||||||
__vh = __ll_highpart(v); \
|
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||||||
\
|
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__x0 = (unsigned long) __ul * __vl; \
|
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__x1 = (unsigned long) __ul * __vh; \
|
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__x2 = (unsigned long) __uh * __vl; \
|
|
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__x3 = (unsigned long) __uh * __vh; \
|
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\
|
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__x1 += __ll_highpart(__x0); \
|
|
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__x1 += __x2; \
|
|
||||||
if (__x1 < __x2) \
|
|
||||||
__x3 += __ll_B; \
|
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\
|
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(w1) = __x3 + __ll_highpart(__x1); \
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(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
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} while (0)
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#endif
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|
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#if !defined(sub_ddmmss)
|
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#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
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do { \
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unsigned long __x; \
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__x = (al) - (bl); \
|
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(sh) = (ah) - (bh) - (__x > (al)); \
|
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(sl) = __x; \
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} while (0)
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#endif
|
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|
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/* Define this unconditionally, so it can be used for debugging. */
|
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#define __udiv_qrnnd_c(q, r, n1, n0, d) \
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do { \
|
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unsigned long __d1, __d0, __q1, __q0; \
|
|
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unsigned long __r1, __r0, __m; \
|
|
||||||
__d1 = __ll_highpart(d); \
|
|
||||||
__d0 = __ll_lowpart(d); \
|
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||||||
\
|
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__r1 = (n1) % __d1; \
|
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__q1 = (n1) / __d1; \
|
|
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__m = (unsigned long) __q1 * __d0; \
|
|
||||||
__r1 = __r1 * __ll_B | __ll_highpart(n0); \
|
|
||||||
if (__r1 < __m) { \
|
|
||||||
__q1--, __r1 += (d); \
|
|
||||||
if (__r1 >= (d)) \
|
|
||||||
if (__r1 < __m) \
|
|
||||||
__q1--, __r1 += (d); \
|
|
||||||
} \
|
|
||||||
__r1 -= __m; \
|
|
||||||
\
|
|
||||||
__r0 = __r1 % __d1; \
|
|
||||||
__q0 = __r1 / __d1; \
|
|
||||||
__m = (unsigned long) __q0 * __d0; \
|
|
||||||
__r0 = __r0 * __ll_B | __ll_lowpart(n0); \
|
|
||||||
if (__r0 < __m) { \
|
|
||||||
__q0--, __r0 += (d); \
|
|
||||||
if (__r0 >= (d)) \
|
|
||||||
if (__r0 < __m) \
|
|
||||||
__q0--, __r0 += (d); \
|
|
||||||
} \
|
|
||||||
__r0 -= __m; \
|
|
||||||
\
|
|
||||||
(q) = (unsigned long) __q1 * __ll_B | __q0; \
|
|
||||||
(r) = __r0; \
|
|
||||||
} while (0)
|
|
||||||
|
|
||||||
/* If udiv_qrnnd was not defined for this processor, use __udiv_qrnnd_c. */
|
|
||||||
#if !defined(udiv_qrnnd)
|
|
||||||
#define UDIV_NEEDS_NORMALIZATION 1
|
|
||||||
#define udiv_qrnnd __udiv_qrnnd_c
|
|
||||||
#endif
|
|
||||||
|
|
||||||
unsigned long long __udivmoddi4(unsigned long long u, unsigned long long v,
|
|
||||||
unsigned long long *rp)
|
|
||||||
{
|
|
||||||
const DWunion nn = {.ll = u };
|
|
||||||
const DWunion dd = {.ll = v };
|
|
||||||
DWunion rr, ww;
|
|
||||||
unsigned long d0, d1, n0, n1, n2;
|
|
||||||
unsigned long q0 = 0, q1 = 0;
|
|
||||||
unsigned long b, bm;
|
|
||||||
|
|
||||||
d0 = dd.s.low;
|
|
||||||
d1 = dd.s.high;
|
|
||||||
n0 = nn.s.low;
|
|
||||||
n1 = nn.s.high;
|
|
||||||
|
|
||||||
#if !UDIV_NEEDS_NORMALIZATION
|
|
||||||
|
|
||||||
if (d1 == 0) {
|
|
||||||
if (d0 > n1) {
|
|
||||||
/* 0q = nn / 0D */
|
|
||||||
|
|
||||||
udiv_qrnnd(q0, n0, n1, n0, d0);
|
|
||||||
q1 = 0;
|
|
||||||
|
|
||||||
/* Remainder in n0. */
|
|
||||||
} else {
|
|
||||||
/* qq = NN / 0d */
|
|
||||||
|
|
||||||
if (d0 == 0)
|
|
||||||
/* Divide intentionally by zero. */
|
|
||||||
d0 = 1 / d0;
|
|
||||||
|
|
||||||
udiv_qrnnd(q1, n1, 0, n1, d0);
|
|
||||||
udiv_qrnnd(q0, n0, n1, n0, d0);
|
|
||||||
|
|
||||||
/* Remainder in n0. */
|
|
||||||
}
|
|
||||||
|
|
||||||
if (rp != 0) {
|
|
||||||
rr.s.low = n0;
|
|
||||||
rr.s.high = 0;
|
|
||||||
*rp = rr.ll;
|
|
||||||
}
|
|
||||||
|
|
||||||
#else /* UDIV_NEEDS_NORMALIZATION */
|
|
||||||
|
|
||||||
if (d1 == 0) {
|
|
||||||
if (d0 > n1) {
|
|
||||||
/* 0q = nn / 0D */
|
|
||||||
|
|
||||||
count_leading_zeros(bm, d0);
|
|
||||||
|
|
||||||
if (bm != 0) {
|
|
||||||
/*
|
|
||||||
* Normalize, i.e. make the most significant bit
|
|
||||||
* of the denominator set.
|
|
||||||
*/
|
|
||||||
|
|
||||||
d0 = d0 << bm;
|
|
||||||
n1 = (n1 << bm) | (n0 >> (W_TYPE_SIZE - bm));
|
|
||||||
n0 = n0 << bm;
|
|
||||||
}
|
|
||||||
|
|
||||||
udiv_qrnnd(q0, n0, n1, n0, d0);
|
|
||||||
q1 = 0;
|
|
||||||
|
|
||||||
/* Remainder in n0 >> bm. */
|
|
||||||
} else {
|
|
||||||
/* qq = NN / 0d */
|
|
||||||
|
|
||||||
if (d0 == 0)
|
|
||||||
/* Divide intentionally by zero. */
|
|
||||||
d0 = 1 / d0;
|
|
||||||
|
|
||||||
count_leading_zeros(bm, d0);
|
|
||||||
|
|
||||||
if (bm == 0) {
|
|
||||||
/*
|
|
||||||
* From (n1 >= d0) /\ (the most significant bit
|
|
||||||
* of d0 is set), conclude (the most significant
|
|
||||||
* bit of n1 is set) /\ (theleading quotient
|
|
||||||
* digit q1 = 1).
|
|
||||||
*
|
|
||||||
* This special case is necessary, not an
|
|
||||||
* optimization. (Shifts counts of W_TYPE_SIZE
|
|
||||||
* are undefined.)
|
|
||||||
*/
|
|
||||||
|
|
||||||
n1 -= d0;
|
|
||||||
q1 = 1;
|
|
||||||
} else {
|
|
||||||
/* Normalize. */
|
|
||||||
|
|
||||||
b = W_TYPE_SIZE - bm;
|
|
||||||
|
|
||||||
d0 = d0 << bm;
|
|
||||||
n2 = n1 >> b;
|
|
||||||
n1 = (n1 << bm) | (n0 >> b);
|
|
||||||
n0 = n0 << bm;
|
|
||||||
|
|
||||||
udiv_qrnnd(q1, n1, n2, n1, d0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* n1 != d0... */
|
|
||||||
|
|
||||||
udiv_qrnnd(q0, n0, n1, n0, d0);
|
|
||||||
|
|
||||||
/* Remainder in n0 >> bm. */
|
|
||||||
}
|
|
||||||
|
|
||||||
if (rp != 0) {
|
|
||||||
rr.s.low = n0 >> bm;
|
|
||||||
rr.s.high = 0;
|
|
||||||
*rp = rr.ll;
|
|
||||||
}
|
|
||||||
|
|
||||||
#endif /* UDIV_NEEDS_NORMALIZATION */
|
|
||||||
|
|
||||||
} else {
|
|
||||||
if (d1 > n1) {
|
|
||||||
/* 00 = nn / DD */
|
|
||||||
|
|
||||||
q0 = 0;
|
|
||||||
q1 = 0;
|
|
||||||
|
|
||||||
/* Remainder in n1n0. */
|
|
||||||
if (rp != 0) {
|
|
||||||
rr.s.low = n0;
|
|
||||||
rr.s.high = n1;
|
|
||||||
*rp = rr.ll;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
/* 0q = NN / dd */
|
|
||||||
|
|
||||||
count_leading_zeros(bm, d1);
|
|
||||||
if (bm == 0) {
|
|
||||||
/*
|
|
||||||
* From (n1 >= d1) /\ (the most significant bit
|
|
||||||
* of d1 is set), conclude (the most significant
|
|
||||||
* bit of n1 is set) /\ (the quotient digit q0 =
|
|
||||||
* 0 or 1).
|
|
||||||
*
|
|
||||||
* This special case is necessary, not an
|
|
||||||
* optimization.
|
|
||||||
*/
|
|
||||||
|
|
||||||
/*
|
|
||||||
* The condition on the next line takes
|
|
||||||
* advantage of that n1 >= d1 (true due to
|
|
||||||
* program flow).
|
|
||||||
*/
|
|
||||||
if (n1 > d1 || n0 >= d0) {
|
|
||||||
q0 = 1;
|
|
||||||
sub_ddmmss(n1, n0, n1, n0, d1, d0);
|
|
||||||
} else {
|
|
||||||
q0 = 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
q1 = 0;
|
|
||||||
|
|
||||||
if (rp != 0) {
|
|
||||||
rr.s.low = n0;
|
|
||||||
rr.s.high = n1;
|
|
||||||
*rp = rr.ll;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
unsigned long m1, m0;
|
|
||||||
/* Normalize. */
|
|
||||||
|
|
||||||
b = W_TYPE_SIZE - bm;
|
|
||||||
|
|
||||||
d1 = (d1 << bm) | (d0 >> b);
|
|
||||||
d0 = d0 << bm;
|
|
||||||
n2 = n1 >> b;
|
|
||||||
n1 = (n1 << bm) | (n0 >> b);
|
|
||||||
n0 = n0 << bm;
|
|
||||||
|
|
||||||
udiv_qrnnd(q0, n1, n2, n1, d1);
|
|
||||||
umul_ppmm(m1, m0, q0, d0);
|
|
||||||
|
|
||||||
if (m1 > n1 || (m1 == n1 && m0 > n0)) {
|
|
||||||
q0--;
|
|
||||||
sub_ddmmss(m1, m0, m1, m0, d1, d0);
|
|
||||||
}
|
|
||||||
|
|
||||||
q1 = 0;
|
|
||||||
|
|
||||||
/* Remainder in (n1n0 - m1m0) >> bm. */
|
|
||||||
if (rp != 0) {
|
|
||||||
sub_ddmmss(n1, n0, n1, n0, m1, m0);
|
|
||||||
rr.s.low = (n1 << b) | (n0 >> bm);
|
|
||||||
rr.s.high = n1 >> bm;
|
|
||||||
*rp = rr.ll;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
ww.s.low = q0;
|
|
||||||
ww.s.high = q1;
|
|
||||||
|
|
||||||
return ww.ll;
|
|
||||||
}
|
|
||||||
|
|
@ -1,32 +0,0 @@
|
||||||
// SPDX-License-Identifier: GPL-2.0
|
|
||||||
|
|
||||||
/*
|
|
||||||
* 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 the file COPYING, or write
|
|
||||||
* to the Free Software Foundation, Inc.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <linux/module.h>
|
|
||||||
#include <linux/libgcc.h>
|
|
||||||
|
|
||||||
extern unsigned long long __udivmoddi4(unsigned long long u,
|
|
||||||
unsigned long long v,
|
|
||||||
unsigned long long *rp);
|
|
||||||
|
|
||||||
unsigned long long __umoddi3(unsigned long long u, unsigned long long v)
|
|
||||||
{
|
|
||||||
unsigned long long w;
|
|
||||||
(void)__udivmoddi4(u, v, &w);
|
|
||||||
return w;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL(__umoddi3);
|
|
||||||
Loading…
Reference in New Issue