diff options
| -rw-r--r-- | arch/powerpc/include/asm/cputable.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/lib/Makefile | 4 | ||||
| -rw-r--r-- | arch/powerpc/lib/copyuser_64.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/lib/copyuser_power7.S | 683 | ||||
| -rw-r--r-- | arch/powerpc/lib/copyuser_power7_vmx.c | 50 |
5 files changed, 744 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h index 7044233..ad55a1c 100644 --- a/arch/powerpc/include/asm/cputable.h +++ b/arch/powerpc/include/asm/cputable.h @@ -201,6 +201,7 @@ extern const char *powerpc_base_platform; #define CPU_FTR_POPCNTB LONG_ASM_CONST(0x0400000000000000) #define CPU_FTR_POPCNTD LONG_ASM_CONST(0x0800000000000000) #define CPU_FTR_ICSWX LONG_ASM_CONST(0x1000000000000000) +#define CPU_FTR_VMX_COPY LONG_ASM_CONST(0x2000000000000000) #ifndef __ASSEMBLY__ @@ -425,7 +426,7 @@ extern const char *powerpc_base_platform; CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \ CPU_FTR_DSCR | CPU_FTR_SAO | CPU_FTR_ASYM_SMT | \ CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \ - CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE) + CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY) #define CPU_FTRS_CELL (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \ CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \ CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \ diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 166a6a0..7735a2c 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -16,13 +16,15 @@ obj-$(CONFIG_HAS_IOMEM) += devres.o obj-$(CONFIG_PPC64) += copypage_64.o copyuser_64.o \ memcpy_64.o usercopy_64.o mem_64.o string.o \ - checksum_wrappers_64.o hweight_64.o + checksum_wrappers_64.o hweight_64.o \ + copyuser_power7.o obj-$(CONFIG_XMON) += sstep.o ldstfp.o obj-$(CONFIG_KPROBES) += sstep.o ldstfp.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += sstep.o ldstfp.o ifeq ($(CONFIG_PPC64),y) obj-$(CONFIG_SMP) += locks.o +obj-$(CONFIG_ALTIVEC) += copyuser_power7_vmx.o endif obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o diff --git a/arch/powerpc/lib/copyuser_64.S b/arch/powerpc/lib/copyuser_64.S index 578b625..773d38f 100644 --- a/arch/powerpc/lib/copyuser_64.S +++ b/arch/powerpc/lib/copyuser_64.S @@ -11,6 +11,12 @@ .align 7 _GLOBAL(__copy_tofrom_user) +BEGIN_FTR_SECTION + nop +FTR_SECTION_ELSE + b __copy_tofrom_user_power7 +ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY) +_GLOBAL(__copy_tofrom_user_base) /* first check for a whole page copy on a page boundary */ cmpldi cr1,r5,16 cmpdi cr6,r5,4096 diff --git a/arch/powerpc/lib/copyuser_power7.S b/arch/powerpc/lib/copyuser_power7.S new file mode 100644 index 0000000..497db7b --- /dev/null +++ b/arch/powerpc/lib/copyuser_power7.S @@ -0,0 +1,683 @@ +/* + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2011 + * + * Author: Anton Blanchard <anton@au.ibm.com> + */ +#include <asm/ppc_asm.h> + +#define STACKFRAMESIZE 256 +#define STK_REG(i) (112 + ((i)-14)*8) + + .macro err1 +100: + .section __ex_table,"a" + .align 3 + .llong 100b,.Ldo_err1 + .previous + .endm + + .macro err2 +200: + .section __ex_table,"a" + .align 3 + .llong 200b,.Ldo_err2 + .previous + .endm + +#ifdef CONFIG_ALTIVEC + .macro err3 +300: + .section __ex_table,"a" + .align 3 + .llong 300b,.Ldo_err3 + .previous + .endm + + .macro err4 +400: + .section __ex_table,"a" + .align 3 + .llong 400b,.Ldo_err4 + .previous + .endm + + +.Ldo_err4: + ld r16,STK_REG(r16)(r1) + ld r15,STK_REG(r15)(r1) + ld r14,STK_REG(r14)(r1) +.Ldo_err3: + bl .exit_vmx_copy + ld r0,STACKFRAMESIZE+16(r1) + mtlr r0 + b .Lexit +#endif /* CONFIG_ALTIVEC */ + +.Ldo_err2: + ld r22,STK_REG(r22)(r1) + ld r21,STK_REG(r21)(r1) + ld r20,STK_REG(r20)(r1) + ld r19,STK_REG(r19)(r1) + ld r18,STK_REG(r18)(r1) + ld r17,STK_REG(r17)(r1) + ld r16,STK_REG(r16)(r1) + ld r15,STK_REG(r15)(r1) + ld r14,STK_REG(r14)(r1) +.Lexit: + addi r1,r1,STACKFRAMESIZE +.Ldo_err1: + ld r3,48(r1) + ld r4,56(r1) + ld r5,64(r1) + b __copy_tofrom_user_base + + +_GLOBAL(__copy_tofrom_user_power7) +#ifdef CONFIG_ALTIVEC + cmpldi r5,16 + cmpldi cr1,r5,4096 + + std r3,48(r1) + std r4,56(r1) + std r5,64(r1) + + blt .Lshort_copy + bgt cr1,.Lvmx_copy +#else + cmpldi r5,16 + + std r3,48(r1) + std r4,56(r1) + std r5,64(r1) + + blt .Lshort_copy +#endif + +.Lnonvmx_copy: + /* Get the source 8B aligned */ + neg r6,r4 + mtocrf 0x01,r6 + clrldi r6,r6,(64-3) + + bf cr7*4+3,1f +err1; lbz r0,0(r4) + addi r4,r4,1 +err1; stb r0,0(r3) + addi r3,r3,1 + +1: bf cr7*4+2,2f +err1; lhz r0,0(r4) + addi r4,r4,2 +err1; sth r0,0(r3) + addi r3,r3,2 + +2: bf cr7*4+1,3f +err1; lwz r0,0(r4) + addi r4,r4,4 +err1; stw r0,0(r3) + addi r3,r3,4 + +3: sub r5,r5,r6 + cmpldi r5,128 + blt 5f + + mflr r0 + stdu r1,-STACKFRAMESIZE(r1) + std r14,STK_REG(r14)(r1) + std r15,STK_REG(r15)(r1) + std r16,STK_REG(r16)(r1) + std r17,STK_REG(r17)(r1) + std r18,STK_REG(r18)(r1) + std r19,STK_REG(r19)(r1) + std r20,STK_REG(r20)(r1) + std r21,STK_REG(r21)(r1) + std r22,STK_REG(r22)(r1) + std r0,STACKFRAMESIZE+16(r1) + + srdi r6,r5,7 + mtctr r6 + + /* Now do cacheline (128B) sized loads and stores. */ + .align 5 +4: +err2; ld r0,0(r4) +err2; ld r6,8(r4) +err2; ld r7,16(r4) +err2; ld r8,24(r4) +err2; ld r9,32(r4) +err2; ld r10,40(r4) +err2; ld r11,48(r4) +err2; ld r12,56(r4) +err2; ld r14,64(r4) +err2; ld r15,72(r4) +err2; ld r16,80(r4) +err2; ld r17,88(r4) +err2; ld r18,96(r4) +err2; ld r19,104(r4) +err2; ld r20,112(r4) +err2; ld r21,120(r4) + addi r4,r4,128 +err2; std r0,0(r3) +err2; std r6,8(r3) +err2; std r7,16(r3) +err2; std r8,24(r3) +err2; std r9,32(r3) +err2; std r10,40(r3) +err2; std r11,48(r3) +err2; std r12,56(r3) +err2; std r14,64(r3) +err2; std r15,72(r3) +err2; std r16,80(r3) +err2; std r17,88(r3) +err2; std r18,96(r3) +err2; std r19,104(r3) +err2; std r20,112(r3) +err2; std r21,120(r3) + addi r3,r3,128 + bdnz 4b + + clrldi r5,r5,(64-7) + + ld r14,STK_REG(r14)(r1) + ld r15,STK_REG(r15)(r1) + ld r16,STK_REG(r16)(r1) + ld r17,STK_REG(r17)(r1) + ld r18,STK_REG(r18)(r1) + ld r19,STK_REG(r19)(r1) + ld r20,STK_REG(r20)(r1) + ld r21,STK_REG(r21)(r1) + ld r22,STK_REG(r22)(r1) + addi r1,r1,STACKFRAMESIZE + + /* Up to 127B to go */ +5: srdi r6,r5,4 + mtocrf 0x01,r6 + +6: bf cr7*4+1,7f +err1; ld r0,0(r4) +err1; ld r6,8(r4) +err1; ld r7,16(r4) +err1; ld r8,24(r4) +err1; ld r9,32(r4) +err1; ld r10,40(r4) +err1; ld r11,48(r4) +err1; ld r12,56(r4) + addi r4,r4,64 +err1; std r0,0(r3) +err1; std r6,8(r3) +err1; std r7,16(r3) +err1; std r8,24(r3) +err1; std r9,32(r3) +err1; std r10,40(r3) +err1; std r11,48(r3) +err1; std r12,56(r3) + addi r3,r3,64 + + /* Up to 63B to go */ +7: bf cr7*4+2,8f +err1; ld r0,0(r4) +err1; ld r6,8(r4) +err1; ld r7,16(r4) +err1; ld r8,24(r4) + addi r4,r4,32 +err1; std r0,0(r3) +err1; std r6,8(r3) +err1; std r7,16(r3) +err1; std r8,24(r3) + addi r3,r3,32 + + /* Up to 31B to go */ +8: bf cr7*4+3,9f +err1; ld r0,0(r4) +err1; ld r6,8(r4) + addi r4,r4,16 +err1; std r0,0(r3) +err1; std r6,8(r3) + addi r3,r3,16 + +9: clrldi r5,r5,(64-4) + + /* Up to 15B to go */ +.Lshort_copy: + mtocrf 0x01,r5 + bf cr7*4+0,12f +err1; lwz r0,0(r4) /* Less chance of a reject with word ops */ +err1; lwz r6,4(r4) + addi r4,r4,8 +err1; stw r0,0(r3) +err1; stw r6,4(r3) + addi r3,r3,8 + +12: bf cr7*4+1,13f +err1; lwz r0,0(r4) + addi r4,r4,4 +err1; stw r0,0(r3) + addi r3,r3,4 + +13: bf cr7*4+2,14f +err1; lhz r0,0(r4) + addi r4,r4,2 +err1; sth r0,0(r3) + addi r3,r3,2 + +14: bf cr7*4+3,15f +err1; lbz r0,0(r4) +err1; stb r0,0(r3) + +15: li r3,0 + blr + +.Lunwind_stack_nonvmx_copy: + addi r1,r1,STACKFRAMESIZE + b .Lnonvmx_copy + +#ifdef CONFIG_ALTIVEC +.Lvmx_copy: + mflr r0 + std r0,16(r1) + stdu r1,-STACKFRAMESIZE(r1) + bl .enter_vmx_copy + cmpwi r3,0 + ld r0,STACKFRAMESIZE+16(r1) + ld r3,STACKFRAMESIZE+48(r1) + ld r4,STACKFRAMESIZE+56(r1) + ld r5,STACKFRAMESIZE+64(r1) + mtlr r0 + + beq .Lunwind_stack_nonvmx_copy + + /* + * If source and destination are not relatively aligned we use a + * slower permute loop. + */ + xor r6,r4,r3 + rldicl. r6,r6,0,(64-4) + bne .Lvmx_unaligned_copy + + /* Get the destination 16B aligned */ + neg r6,r3 + mtocrf 0x01,r6 + clrldi r6,r6,(64-4) + + bf cr7*4+3,1f +err3; lbz r0,0(r4) + addi r4,r4,1 +err3; stb r0,0(r3) + addi r3,r3,1 + +1: bf cr7*4+2,2f +err3; lhz r0,0(r4) + addi r4,r4,2 +err3; sth r0,0(r3) + addi r3,r3,2 + +2: bf cr7*4+1,3f +err3; lwz r0,0(r4) + addi r4,r4,4 +err3; stw r0,0(r3) + addi r3,r3,4 + +3: bf cr7*4+0,4f +err3; ld r0,0(r4) + addi r4,r4,8 +err3; std r0,0(r3) + addi r3,r3,8 + +4: sub r5,r5,r6 + + /* Get the desination 128B aligned */ + neg r6,r3 + srdi r7,r6,4 + mtocrf 0x01,r7 + clrldi r6,r6,(64-7) + + li r9,16 + li r10,32 + li r11,48 + + bf cr7*4+3,5f +err3; lvx vr1,r0,r4 + addi r4,r4,16 +err3; stvx vr1,r0,r3 + addi r3,r3,16 + +5: bf cr7*4+2,6f +err3; lvx vr1,r0,r4 +err3; lvx vr0,r4,r9 + addi r4,r4,32 +err3; stvx vr1,r0,r3 +err3; stvx vr0,r3,r9 + addi r3,r3,32 + +6: bf cr7*4+1,7f +err3; lvx vr3,r0,r4 +err3; lvx vr2,r4,r9 +err3; lvx vr1,r4,r10 +err3; lvx vr0,r4,r11 + addi r4,r4,64 +err3; stvx vr3,r0,r3 +err3; stvx vr2,r3,r9 +err3; stvx vr1,r3,r10 +err3; stvx vr0,r3,r11 + addi r3,r3,64 + +7: sub r5,r5,r6 + srdi r6,r5,7 + + std r14,STK_REG(r14)(r1) + std r15,STK_REG(r15)(r1) + std r16,STK_REG(r16)(r1) + + li r12,64 + li r14,80 + li r15,96 + li r16,112 + + mtctr r6 + + /* + * Now do cacheline sized loads and stores. By this stage the + * cacheline stores are also cacheline aligned. + */ + .align 5 +8: +err4; lvx vr7,r0,r4 +err4; lvx vr6,r4,r9 +err4; lvx vr5,r4,r10 +err4; lvx vr4,r4,r11 +err4; lvx vr3,r4,r12 +err4; lvx vr2,r4,r14 +err4; lvx vr1,r4,r15 +err4; lvx vr0,r4,r16 + addi r4,r4,128 +err4; stvx vr7,r0,r3 +err4; stvx vr6,r3,r9 +err4; stvx vr5,r3,r10 +err4; stvx vr4,r3,r11 +err4; stvx vr3,r3,r12 +err4; stvx vr2,r3,r14 +err4; stvx vr1,r3,r15 +err4; stvx vr0,r3,r16 + addi r3,r3,128 + bdnz 8b + + ld r14,STK_REG(r14)(r1) + ld r15,STK_REG(r15)(r1) + ld r16,STK_REG(r16)(r1) + + /* Up to 127B to go */ + clrldi r5,r5,(64-7) + srdi r6,r5,4 + mtocrf 0x01,r6 + + bf cr7*4+1,9f +err3; lvx vr3,r0,r4 +err3; lvx vr2,r4,r9 +err3; lvx vr1,r4,r10 +err3; lvx vr0,r4,r11 + addi r4,r4,64 +err3; stvx vr3,r0,r3 +err3; stvx vr2,r3,r9 +err3; stvx vr1,r3,r10 +err3; stvx vr0,r3,r11 + addi r3,r3,64 + +9: bf cr7*4+2,10f +err3; lvx vr1,r0,r4 +err3; lvx vr0,r4,r9 + addi r4,r4,32 +err3; stvx vr1,r0,r3 +err3; stvx vr0,r3,r9 + addi r3,r3,32 + +10: bf cr7*4+3,11f +err3; lvx vr1,r0,r4 + addi r4,r4,16 +err3; stvx vr1,r0,r3 + addi r3,r3,16 + + /* Up to 15B to go */ +11: clrldi r5,r5,(64-4) + mtocrf 0x01,r5 + bf cr7*4+0,12f +err3; ld r0,0(r4) + addi r4,r4,8 +err3; std r0,0(r3) + addi r3,r3,8 + +12: bf cr7*4+1,13f +err3; lwz r0,0(r4) + addi r4,r4,4 +err3; stw r0,0(r3) + addi r3,r3,4 + +13: bf cr7*4+2,14f +err3; lhz r0,0(r4) + addi r4,r4,2 +err3; sth r0,0(r3) + addi r3,r3,2 + +14: bf cr7*4+3,15f +err3; lbz r0,0(r4) +err3; stb r0,0(r3) + +15: addi r1,r1,STACKFRAMESIZE + b .exit_vmx_copy /* tail call optimise */ + +.Lvmx_unaligned_copy: + /* Get the destination 16B aligned */ + neg r6,r3 + mtocrf 0x01,r6 + clrldi r6,r6,(64-4) + + bf cr7*4+3,1f +err3; lbz r0,0(r4) + addi r4,r4,1 +err3; stb r0,0(r3) + addi r3,r3,1 + +1: bf cr7*4+2,2f +err3; lhz r0,0(r4) + addi r4,r4,2 +err3; sth r0,0(r3) + addi r3,r3,2 + +2: bf cr7*4+1,3f +err3; lwz r0,0(r4) + addi r4,r4,4 +err3; stw r0,0(r3) + addi r3,r3,4 + +3: bf cr7*4+0,4f +err3; lwz r0,0(r4) /* Less chance of a reject with word ops */ +err3; lwz r7,4(r4) + addi r4,r4,8 +err3; stw r0,0(r3) +err3; stw r7,4(r3) + addi r3,r3,8 + +4: sub r5,r5,r6 + + /* Get the desination 128B aligned */ + neg r6,r3 + srdi r7,r6,4 + mtocrf 0x01,r7 + clrldi r6,r6,(64-7) + + li r9,16 + li r10,32 + li r11,48 + + lvsl vr16,0,r4 /* Setup permute control vector */ +err3; lvx vr0,0,r4 + addi r4,r4,16 + + bf cr7*4+3,5f +err3; lvx vr1,r0,r4 + vperm vr8,vr0,vr1,vr16 + addi r4,r4,16 +err3; stvx vr8,r0,r3 + addi r3,r3,16 + vor vr0,vr1,vr1 + +5: bf cr7*4+2,6f +err3; lvx vr1,r0,r4 + vperm vr8,vr0,vr1,vr16 +err3; lvx vr0,r4,r9 + vperm vr9,vr1,vr0,vr16 + addi r4,r4,32 +err3; stvx vr8,r0,r3 +err3; stvx vr9,r3,r9 + addi r3,r3,32 + +6: bf cr7*4+1,7f +err3; lvx vr3,r0,r4 + vperm vr8,vr0,vr3,vr16 +err3; lvx vr2,r4,r9 + vperm vr9,vr3,vr2,vr16 +err3; lvx vr1,r4,r10 + vperm vr10,vr2,vr1,vr16 +err3; lvx vr0,r4,r11 + vperm vr11,vr1,vr0,vr16 + addi r4,r4,64 +err3; stvx vr8,r0,r3 +err3; stvx vr9,r3,r9 +err3; stvx vr10,r3,r10 +err3; stvx vr11,r3,r11 + addi r3,r3,64 + +7: sub r5,r5,r6 + srdi r6,r5,7 + + std r14,STK_REG(r14)(r1) + std r15,STK_REG(r15)(r1) + std r16,STK_REG(r16)(r1) + + li r12,64 + li r14,80 + li r15,96 + li r16,112 + + mtctr r6 + + /* + * Now do cacheline sized loads and stores. By this stage the + * cacheline stores are also cacheline aligned. + */ + .align 5 +8: +err4; lvx vr7,r0,r4 + vperm vr8,vr0,vr7,vr16 +err4; lvx vr6,r4,r9 + vperm vr9,vr7,vr6,vr16 +err4; lvx vr5,r4,r10 + vperm vr10,vr6,vr5,vr16 +err4; lvx vr4,r4,r11 + vperm vr11,vr5,vr4,vr16 +err4; lvx vr3,r4,r12 + vperm vr12,vr4,vr3,vr16 +err4; lvx vr2,r4,r14 + vperm vr13,vr3,vr2,vr16 +err4; lvx vr1,r4,r15 + vperm vr14,vr2,vr1,vr16 +err4; lvx vr0,r4,r16 + vperm vr15,vr1,vr0,vr16 + addi r4,r4,128 +err4; stvx vr8,r0,r3 +err4; stvx vr9,r3,r9 +err4; stvx vr10,r3,r10 +err4; stvx vr11,r3,r11 +err4; stvx vr12,r3,r12 +err4; stvx vr13,r3,r14 +err4; stvx vr14,r3,r15 +err4; stvx vr15,r3,r16 + addi r3,r3,128 + bdnz 8b + + ld r14,STK_REG(r14)(r1) + ld r15,STK_REG(r15)(r1) + ld r16,STK_REG(r16)(r1) + + /* Up to 127B to go */ + clrldi r5,r5,(64-7) + srdi r6,r5,4 + mtocrf 0x01,r6 + + bf cr7*4+1,9f +err3; lvx vr3,r0,r4 + vperm vr8,vr0,vr3,vr16 +err3; lvx vr2,r4,r9 + vperm vr9,vr3,vr2,vr16 +err3; lvx vr1,r4,r10 + vperm vr10,vr2,vr1,vr16 +err3; lvx vr0,r4,r11 + vperm vr11,vr1,vr0,vr16 + addi r4,r4,64 +err3; stvx vr8,r0,r3 +err3; stvx vr9,r3,r9 +err3; stvx vr10,r3,r10 +err3; stvx vr11,r3,r11 + addi r3,r3,64 + +9: bf cr7*4+2,10f +err3; lvx vr1,r0,r4 + vperm vr8,vr0,vr1,vr16 +err3; lvx vr0,r4,r9 + vperm vr9,vr1,vr0,vr16 + addi r4,r4,32 +err3; stvx vr8,r0,r3 +err3; stvx vr9,r3,r9 + addi r3,r3,32 + +10: bf cr7*4+3,11f +err3; lvx vr1,r0,r4 + vperm vr8,vr0,vr1,vr16 + addi r4,r4,16 +err3; stvx vr8,r0,r3 + addi r3,r3,16 + + /* Up to 15B to go */ +11: clrldi r5,r5,(64-4) + addi r4,r4,-16 /* Unwind the +16 load offset */ + mtocrf 0x01,r5 + bf cr7*4+0,12f +err3; lwz r0,0(r4) /* Less chance of a reject with word ops */ +err3; lwz r6,4(r4) + addi r4,r4,8 +err3; stw r0,0(r3) +err3; stw r6,4(r3) + addi r3,r3,8 + +12: bf cr7*4+1,13f +err3; lwz r0,0(r4) + addi r4,r4,4 +err3; stw r0,0(r3) + addi r3,r3,4 + +13: bf cr7*4+2,14f +err3; lhz r0,0(r4) + addi r4,r4,2 +err3; sth r0,0(r3) + addi r3,r3,2 + +14: bf cr7*4+3,15f +err3; lbz r0,0(r4) +err3; stb r0,0(r3) + +15: addi r1,r1,STACKFRAMESIZE + b .exit_vmx_copy /* tail call optimise */ +#endif /* CONFiG_ALTIVEC */ diff --git a/arch/powerpc/lib/copyuser_power7_vmx.c b/arch/powerpc/lib/copyuser_power7_vmx.c new file mode 100644 index 0000000..6e1efad --- /dev/null +++ b/arch/powerpc/lib/copyuser_power7_vmx.c @@ -0,0 +1,50 @@ +/* + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2011 + * + * Authors: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> + * Anton Blanchard <anton@au.ibm.com> + */ +#include <linux/uaccess.h> +#include <linux/hardirq.h> + +int enter_vmx_copy(void) +{ + if (in_interrupt()) + return 0; + + /* This acts as preempt_disable() as well and will make + * enable_kernel_altivec(). We need to disable page faults + * as they can call schedule and thus make us lose the VMX + * context. So on page faults, we just fail which will cause + * a fallback to the normal non-vmx copy. + */ + pagefault_disable(); + + enable_kernel_altivec(); + + return 1; +} + +/* + * This function must return 0 because we tail call optimise when calling + * from __copy_tofrom_user_power7 which returns 0 on success. + */ +int exit_vmx_copy(void) +{ + pagefault_enable(); + return 0; +} |