diff options
| -rw-r--r-- | arch/mips/kvm/kvm_locore.S | 975 |
1 files changed, 491 insertions, 484 deletions
diff --git a/arch/mips/kvm/kvm_locore.S b/arch/mips/kvm/kvm_locore.S index dca2aa665993..301b9ad1a905 100644 --- a/arch/mips/kvm/kvm_locore.S +++ b/arch/mips/kvm/kvm_locore.S @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* Main entry point for the guest, exception handling. -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal <sanjayl@kymasys.com> -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Main entry point for the guest, exception handling. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal <sanjayl@kymasys.com> + */ #include <asm/asm.h> #include <asm/asmmacro.h> @@ -57,172 +57,177 @@ */ FEXPORT(__kvm_mips_vcpu_run) - .set push - .set noreorder - .set noat - - /* k0/k1 not being used in host kernel context */ - addiu k1,sp, -PT_SIZE - LONG_S $0, PT_R0(k1) - LONG_S $1, PT_R1(k1) - LONG_S $2, PT_R2(k1) - LONG_S $3, PT_R3(k1) - - LONG_S $4, PT_R4(k1) - LONG_S $5, PT_R5(k1) - LONG_S $6, PT_R6(k1) - LONG_S $7, PT_R7(k1) - - LONG_S $8, PT_R8(k1) - LONG_S $9, PT_R9(k1) - LONG_S $10, PT_R10(k1) - LONG_S $11, PT_R11(k1) - LONG_S $12, PT_R12(k1) - LONG_S $13, PT_R13(k1) - LONG_S $14, PT_R14(k1) - LONG_S $15, PT_R15(k1) - LONG_S $16, PT_R16(k1) - LONG_S $17, PT_R17(k1) - - LONG_S $18, PT_R18(k1) - LONG_S $19, PT_R19(k1) - LONG_S $20, PT_R20(k1) - LONG_S $21, PT_R21(k1) - LONG_S $22, PT_R22(k1) - LONG_S $23, PT_R23(k1) - LONG_S $24, PT_R24(k1) - LONG_S $25, PT_R25(k1) + .set push + .set noreorder + .set noat + + /* k0/k1 not being used in host kernel context */ + addiu k1, sp, -PT_SIZE + LONG_S $0, PT_R0(k1) + LONG_S $1, PT_R1(k1) + LONG_S $2, PT_R2(k1) + LONG_S $3, PT_R3(k1) + + LONG_S $4, PT_R4(k1) + LONG_S $5, PT_R5(k1) + LONG_S $6, PT_R6(k1) + LONG_S $7, PT_R7(k1) + + LONG_S $8, PT_R8(k1) + LONG_S $9, PT_R9(k1) + LONG_S $10, PT_R10(k1) + LONG_S $11, PT_R11(k1) + LONG_S $12, PT_R12(k1) + LONG_S $13, PT_R13(k1) + LONG_S $14, PT_R14(k1) + LONG_S $15, PT_R15(k1) + LONG_S $16, PT_R16(k1) + LONG_S $17, PT_R17(k1) + + LONG_S $18, PT_R18(k1) + LONG_S $19, PT_R19(k1) + LONG_S $20, PT_R20(k1) + LONG_S $21, PT_R21(k1) + LONG_S $22, PT_R22(k1) + LONG_S $23, PT_R23(k1) + LONG_S $24, PT_R24(k1) + LONG_S $25, PT_R25(k1) /* XXXKYMA k0/k1 not saved, not being used if we got here through an ioctl() */ - LONG_S $28, PT_R28(k1) - LONG_S $29, PT_R29(k1) - LONG_S $30, PT_R30(k1) - LONG_S $31, PT_R31(k1) + LONG_S $28, PT_R28(k1) + LONG_S $29, PT_R29(k1) + LONG_S $30, PT_R30(k1) + LONG_S $31, PT_R31(k1) - /* Save hi/lo */ - mflo v0 - LONG_S v0, PT_LO(k1) - mfhi v1 - LONG_S v1, PT_HI(k1) + /* Save hi/lo */ + mflo v0 + LONG_S v0, PT_LO(k1) + mfhi v1 + LONG_S v1, PT_HI(k1) /* Save host status */ - mfc0 v0, CP0_STATUS - LONG_S v0, PT_STATUS(k1) + mfc0 v0, CP0_STATUS + LONG_S v0, PT_STATUS(k1) /* Save host ASID, shove it into the BVADDR location */ - mfc0 v1,CP0_ENTRYHI - andi v1, 0xff - LONG_S v1, PT_HOST_ASID(k1) + mfc0 v1, CP0_ENTRYHI + andi v1, 0xff + LONG_S v1, PT_HOST_ASID(k1) - /* Save DDATA_LO, will be used to store pointer to vcpu */ - mfc0 v1, CP0_DDATA_LO - LONG_S v1, PT_HOST_USERLOCAL(k1) + /* Save DDATA_LO, will be used to store pointer to vcpu */ + mfc0 v1, CP0_DDATA_LO + LONG_S v1, PT_HOST_USERLOCAL(k1) - /* DDATA_LO has pointer to vcpu */ - mtc0 a1,CP0_DDATA_LO + /* DDATA_LO has pointer to vcpu */ + mtc0 a1, CP0_DDATA_LO - /* Offset into vcpu->arch */ - addiu k1, a1, VCPU_HOST_ARCH + /* Offset into vcpu->arch */ + addiu k1, a1, VCPU_HOST_ARCH - /* Save the host stack to VCPU, used for exception processing when we exit from the Guest */ - LONG_S sp, VCPU_HOST_STACK(k1) + /* + * Save the host stack to VCPU, used for exception processing + * when we exit from the Guest + */ + LONG_S sp, VCPU_HOST_STACK(k1) - /* Save the kernel gp as well */ - LONG_S gp, VCPU_HOST_GP(k1) + /* Save the kernel gp as well */ + LONG_S gp, VCPU_HOST_GP(k1) /* Setup status register for running the guest in UM, interrupts are disabled */ - li k0,(ST0_EXL | KSU_USER| ST0_BEV) - mtc0 k0,CP0_STATUS - ehb - - /* load up the new EBASE */ - LONG_L k0, VCPU_GUEST_EBASE(k1) - mtc0 k0,CP0_EBASE - - /* Now that the new EBASE has been loaded, unset BEV, set interrupt mask as it was - * but make sure that timer interrupts are enabled - */ - li k0,(ST0_EXL | KSU_USER | ST0_IE) - andi v0, v0, ST0_IM - or k0, k0, v0 - mtc0 k0,CP0_STATUS - ehb + li k0, (ST0_EXL | KSU_USER | ST0_BEV) + mtc0 k0, CP0_STATUS + ehb + + /* load up the new EBASE */ + LONG_L k0, VCPU_GUEST_EBASE(k1) + mtc0 k0, CP0_EBASE + + /* + * Now that the new EBASE has been loaded, unset BEV, set + * interrupt mask as it was but make sure that timer interrupts + * are enabled + */ + li k0, (ST0_EXL | KSU_USER | ST0_IE) + andi v0, v0, ST0_IM + or k0, k0, v0 + mtc0 k0, CP0_STATUS + ehb /* Set Guest EPC */ - LONG_L t0, VCPU_PC(k1) - mtc0 t0, CP0_EPC + LONG_L t0, VCPU_PC(k1) + mtc0 t0, CP0_EPC FEXPORT(__kvm_mips_load_asid) - /* Set the ASID for the Guest Kernel */ - sll t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ - /* addresses shift to 0x80000000 */ - bltz t0, 1f /* If kernel */ - addiu t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ - addiu t1, k1, VCPU_GUEST_USER_ASID /* else user */ + /* Set the ASID for the Guest Kernel */ + sll t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ + /* addresses shift to 0x80000000 */ + bltz t0, 1f /* If kernel */ + addiu t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ + addiu t1, k1, VCPU_GUEST_USER_ASID /* else user */ 1: - /* t1: contains the base of the ASID array, need to get the cpu id */ - LONG_L t2, TI_CPU($28) /* smp_processor_id */ - sll t2, t2, 2 /* x4 */ - addu t3, t1, t2 - LONG_L k0, (t3) - andi k0, k0, 0xff - mtc0 k0,CP0_ENTRYHI - ehb - - /* Disable RDHWR access */ - mtc0 zero, CP0_HWRENA - - /* Now load up the Guest Context from VCPU */ - LONG_L $1, VCPU_R1(k1) - LONG_L $2, VCPU_R2(k1) - LONG_L $3, VCPU_R3(k1) - - LONG_L $4, VCPU_R4(k1) - LONG_L $5, VCPU_R5(k1) - LONG_L $6, VCPU_R6(k1) - LONG_L $7, VCPU_R7(k1) - - LONG_L $8, VCPU_R8(k1) - LONG_L $9, VCPU_R9(k1) - LONG_L $10, VCPU_R10(k1) - LONG_L $11, VCPU_R11(k1) - LONG_L $12, VCPU_R12(k1) - LONG_L $13, VCPU_R13(k1) - LONG_L $14, VCPU_R14(k1) - LONG_L $15, VCPU_R15(k1) - LONG_L $16, VCPU_R16(k1) - LONG_L $17, VCPU_R17(k1) - LONG_L $18, VCPU_R18(k1) - LONG_L $19, VCPU_R19(k1) - LONG_L $20, VCPU_R20(k1) - LONG_L $21, VCPU_R21(k1) - LONG_L $22, VCPU_R22(k1) - LONG_L $23, VCPU_R23(k1) - LONG_L $24, VCPU_R24(k1) - LONG_L $25, VCPU_R25(k1) - - /* k0/k1 loaded up later */ - - LONG_L $28, VCPU_R28(k1) - LONG_L $29, VCPU_R29(k1) - LONG_L $30, VCPU_R30(k1) - LONG_L $31, VCPU_R31(k1) - - /* Restore hi/lo */ - LONG_L k0, VCPU_LO(k1) - mtlo k0 - - LONG_L k0, VCPU_HI(k1) - mthi k0 + /* t1: contains the base of the ASID array, need to get the cpu id */ + LONG_L t2, TI_CPU($28) /* smp_processor_id */ + sll t2, t2, 2 /* x4 */ + addu t3, t1, t2 + LONG_L k0, (t3) + andi k0, k0, 0xff + mtc0 k0, CP0_ENTRYHI + ehb + + /* Disable RDHWR access */ + mtc0 zero, CP0_HWRENA + + /* Now load up the Guest Context from VCPU */ + LONG_L $1, VCPU_R1(k1) + LONG_L $2, VCPU_R2(k1) + LONG_L $3, VCPU_R3(k1) + + LONG_L $4, VCPU_R4(k1) + LONG_L $5, VCPU_R5(k1) + LONG_L $6, VCPU_R6(k1) + LONG_L $7, VCPU_R7(k1) + + LONG_L $8, VCPU_R8(k1) + LONG_L $9, VCPU_R9(k1) + LONG_L $10, VCPU_R10(k1) + LONG_L $11, VCPU_R11(k1) + LONG_L $12, VCPU_R12(k1) + LONG_L $13, VCPU_R13(k1) + LONG_L $14, VCPU_R14(k1) + LONG_L $15, VCPU_R15(k1) + LONG_L $16, VCPU_R16(k1) + LONG_L $17, VCPU_R17(k1) + LONG_L $18, VCPU_R18(k1) + LONG_L $19, VCPU_R19(k1) + LONG_L $20, VCPU_R20(k1) + LONG_L $21, VCPU_R21(k1) + LONG_L $22, VCPU_R22(k1) + LONG_L $23, VCPU_R23(k1) + LONG_L $24, VCPU_R24(k1) + LONG_L $25, VCPU_R25(k1) + + /* k0/k1 loaded up later */ + + LONG_L $28, VCPU_R28(k1) + LONG_L $29, VCPU_R29(k1) + LONG_L $30, VCPU_R30(k1) + LONG_L $31, VCPU_R31(k1) + + /* Restore hi/lo */ + LONG_L k0, VCPU_LO(k1) + mtlo k0 + + LONG_L k0, VCPU_HI(k1) + mthi k0 FEXPORT(__kvm_mips_load_k0k1) /* Restore the guest's k0/k1 registers */ - LONG_L k0, VCPU_R26(k1) - LONG_L k1, VCPU_R27(k1) + LONG_L k0, VCPU_R26(k1) + LONG_L k1, VCPU_R27(k1) - /* Jump to guest */ + /* Jump to guest */ eret .set pop @@ -230,19 +235,19 @@ VECTOR(MIPSX(exception), unknown) /* * Find out what mode we came from and jump to the proper handler. */ - .set push + .set push .set noat - .set noreorder - mtc0 k0, CP0_ERROREPC #01: Save guest k0 - ehb #02: - - mfc0 k0, CP0_EBASE #02: Get EBASE - srl k0, k0, 10 #03: Get rid of CPUNum - sll k0, k0, 10 #04 - LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000 - addiu k0, k0, 0x2000 #06: Exception handler is installed @ offset 0x2000 - j k0 #07: jump to the function - nop #08: branch delay slot + .set noreorder + mtc0 k0, CP0_ERROREPC #01: Save guest k0 + ehb #02: + + mfc0 k0, CP0_EBASE #02: Get EBASE + srl k0, k0, 10 #03: Get rid of CPUNum + sll k0, k0, 10 #04 + LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000 + addiu k0, k0, 0x2000 #06: Exception handler is installed @ offset 0x2000 + j k0 #07: jump to the function + nop #08: branch delay slot .set push VECTOR_END(MIPSX(exceptionEnd)) .end MIPSX(exception) @@ -253,329 +258,332 @@ VECTOR_END(MIPSX(exceptionEnd)) * */ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) - .set push - .set noat - .set noreorder - - /* Get the VCPU pointer from DDTATA_LO */ - mfc0 k1, CP0_DDATA_LO - addiu k1, k1, VCPU_HOST_ARCH - - /* Start saving Guest context to VCPU */ - LONG_S $0, VCPU_R0(k1) - LONG_S $1, VCPU_R1(k1) - LONG_S $2, VCPU_R2(k1) - LONG_S $3, VCPU_R3(k1) - LONG_S $4, VCPU_R4(k1) - LONG_S $5, VCPU_R5(k1) - LONG_S $6, VCPU_R6(k1) - LONG_S $7, VCPU_R7(k1) - LONG_S $8, VCPU_R8(k1) - LONG_S $9, VCPU_R9(k1) - LONG_S $10, VCPU_R10(k1) - LONG_S $11, VCPU_R11(k1) - LONG_S $12, VCPU_R12(k1) - LONG_S $13, VCPU_R13(k1) - LONG_S $14, VCPU_R14(k1) - LONG_S $15, VCPU_R15(k1) - LONG_S $16, VCPU_R16(k1) - LONG_S $17,VCPU_R17(k1) - LONG_S $18, VCPU_R18(k1) - LONG_S $19, VCPU_R19(k1) - LONG_S $20, VCPU_R20(k1) - LONG_S $21, VCPU_R21(k1) - LONG_S $22, VCPU_R22(k1) - LONG_S $23, VCPU_R23(k1) - LONG_S $24, VCPU_R24(k1) - LONG_S $25, VCPU_R25(k1) - - /* Guest k0/k1 saved later */ - - LONG_S $28, VCPU_R28(k1) - LONG_S $29, VCPU_R29(k1) - LONG_S $30, VCPU_R30(k1) - LONG_S $31, VCPU_R31(k1) - - /* We need to save hi/lo and restore them on - * the way out - */ - mfhi t0 - LONG_S t0, VCPU_HI(k1) - - mflo t0 - LONG_S t0, VCPU_LO(k1) - - /* Finally save guest k0/k1 to VCPU */ - mfc0 t0, CP0_ERROREPC - LONG_S t0, VCPU_R26(k1) - - /* Get GUEST k1 and save it in VCPU */ - la t1, ~0x2ff - mfc0 t0, CP0_EBASE - and t0, t0, t1 - LONG_L t0, 0x3000(t0) - LONG_S t0, VCPU_R27(k1) - - /* Now that context has been saved, we can use other registers */ - - /* Restore vcpu */ - mfc0 a1, CP0_DDATA_LO - move s1, a1 - - /* Restore run (vcpu->run) */ - LONG_L a0, VCPU_RUN(a1) - /* Save pointer to run in s0, will be saved by the compiler */ - move s0, a0 - - - /* Save Host level EPC, BadVaddr and Cause to VCPU, useful to process the exception */ - mfc0 k0,CP0_EPC - LONG_S k0, VCPU_PC(k1) - - mfc0 k0, CP0_BADVADDR - LONG_S k0, VCPU_HOST_CP0_BADVADDR(k1) - - mfc0 k0, CP0_CAUSE - LONG_S k0, VCPU_HOST_CP0_CAUSE(k1) - - mfc0 k0, CP0_ENTRYHI - LONG_S k0, VCPU_HOST_ENTRYHI(k1) - - /* Now restore the host state just enough to run the handlers */ - - /* Swtich EBASE to the one used by Linux */ - /* load up the host EBASE */ - mfc0 v0, CP0_STATUS - - .set at - or k0, v0, ST0_BEV - .set noat - - mtc0 k0, CP0_STATUS - ehb - - LONG_L k0, VCPU_HOST_EBASE(k1) - mtc0 k0,CP0_EBASE - - - /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ - .set at - and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE) - or v0, v0, ST0_CU0 - .set noat - mtc0 v0, CP0_STATUS - ehb - - /* Load up host GP */ - LONG_L gp, VCPU_HOST_GP(k1) - - /* Need a stack before we can jump to "C" */ - LONG_L sp, VCPU_HOST_STACK(k1) - - /* Saved host state */ - addiu sp,sp, -PT_SIZE + .set push + .set noat + .set noreorder + + /* Get the VCPU pointer from DDTATA_LO */ + mfc0 k1, CP0_DDATA_LO + addiu k1, k1, VCPU_HOST_ARCH + + /* Start saving Guest context to VCPU */ + LONG_S $0, VCPU_R0(k1) + LONG_S $1, VCPU_R1(k1) + LONG_S $2, VCPU_R2(k1) + LONG_S $3, VCPU_R3(k1) + LONG_S $4, VCPU_R4(k1) + LONG_S $5, VCPU_R5(k1) + LONG_S $6, VCPU_R6(k1) + LONG_S $7, VCPU_R7(k1) + LONG_S $8, VCPU_R8(k1) + LONG_S $9, VCPU_R9(k1) + LONG_S $10, VCPU_R10(k1) + LONG_S $11, VCPU_R11(k1) + LONG_S $12, VCPU_R12(k1) + LONG_S $13, VCPU_R13(k1) + LONG_S $14, VCPU_R14(k1) + LONG_S $15, VCPU_R15(k1) + LONG_S $16, VCPU_R16(k1) + LONG_S $17, VCPU_R17(k1) + LONG_S $18, VCPU_R18(k1) + LONG_S $19, VCPU_R19(k1) + LONG_S $20, VCPU_R20(k1) + LONG_S $21, VCPU_R21(k1) + LONG_S $22, VCPU_R22(k1) + LONG_S $23, VCPU_R23(k1) + LONG_S $24, VCPU_R24(k1) + LONG_S $25, VCPU_R25(k1) + + /* Guest k0/k1 saved later */ + + LONG_S $28, VCPU_R28(k1) + LONG_S $29, VCPU_R29(k1) + LONG_S $30, VCPU_R30(k1) + LONG_S $31, VCPU_R31(k1) + + /* We need to save hi/lo and restore them on + * the way out + */ + mfhi t0 + LONG_S t0, VCPU_HI(k1) + + mflo t0 + LONG_S t0, VCPU_LO(k1) + + /* Finally save guest k0/k1 to VCPU */ + mfc0 t0, CP0_ERROREPC + LONG_S t0, VCPU_R26(k1) + + /* Get GUEST k1 and save it in VCPU */ + la t1, ~0x2ff + mfc0 t0, CP0_EBASE + and t0, t0, t1 + LONG_L t0, 0x3000(t0) + LONG_S t0, VCPU_R27(k1) + + /* Now that context has been saved, we can use other registers */ + + /* Restore vcpu */ + mfc0 a1, CP0_DDATA_LO + move s1, a1 + + /* Restore run (vcpu->run) */ + LONG_L a0, VCPU_RUN(a1) + /* Save pointer to run in s0, will be saved by the compiler */ + move s0, a0 + + /* Save Host level EPC, BadVaddr and Cause to VCPU, useful to + * process the exception */ + mfc0 k0,CP0_EPC + LONG_S k0, VCPU_PC(k1) + + mfc0 k0, CP0_BADVADDR + LONG_S k0, VCPU_HOST_CP0_BADVADDR(k1) + + mfc0 k0, CP0_CAUSE + LONG_S k0, VCPU_HOST_CP0_CAUSE(k1) + + mfc0 k0, CP0_ENTRYHI + LONG_S k0, VCPU_HOST_ENTRYHI(k1) + + /* Now restore the host state just enough to run the handlers */ + + /* Swtich EBASE to the one used by Linux */ + /* load up the host EBASE */ + mfc0 v0, CP0_STATUS + + .set at + or k0, v0, ST0_BEV + .set noat + + mtc0 k0, CP0_STATUS + ehb - /* XXXKYMA do we need to load the host ASID, maybe not because the - * kernel entries are marked GLOBAL, need to verify - */ + LONG_L k0, VCPU_HOST_EBASE(k1) + mtc0 k0,CP0_EBASE - /* Restore host DDATA_LO */ - LONG_L k0, PT_HOST_USERLOCAL(sp) - mtc0 k0, CP0_DDATA_LO - /* Restore RDHWR access */ - la k0, 0x2000000F - mtc0 k0, CP0_HWRENA + /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ + .set at + and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE) + or v0, v0, ST0_CU0 + .set noat + mtc0 v0, CP0_STATUS + ehb - /* Jump to handler */ + /* Load up host GP */ + LONG_L gp, VCPU_HOST_GP(k1) + + /* Need a stack before we can jump to "C" */ + LONG_L sp, VCPU_HOST_STACK(k1) + + /* Saved host state */ + addiu sp, sp, -PT_SIZE + + /* XXXKYMA do we need to load the host ASID, maybe not because the + * kernel entries are marked GLOBAL, need to verify + */ + + /* Restore host DDATA_LO */ + LONG_L k0, PT_HOST_USERLOCAL(sp) + mtc0 k0, CP0_DDATA_LO + + /* Restore RDHWR access */ + la k0, 0x2000000F + mtc0 k0, CP0_HWRENA + + /* Jump to handler */ FEXPORT(__kvm_mips_jump_to_handler) - /* XXXKYMA: not sure if this is safe, how large is the stack?? */ - /* Now jump to the kvm_mips_handle_exit() to see if we can deal with this in the kernel */ - la t9,kvm_mips_handle_exit - jalr.hb t9 - addiu sp,sp, -CALLFRAME_SIZ /* BD Slot */ - - /* Return from handler Make sure interrupts are disabled */ - di - ehb - - /* XXXKYMA: k0/k1 could have been blown away if we processed an exception - * while we were handling the exception from the guest, reload k1 - */ - move k1, s1 - addiu k1, k1, VCPU_HOST_ARCH - - /* Check return value, should tell us if we are returning to the host (handle I/O etc) - * or resuming the guest - */ - andi t0, v0, RESUME_HOST - bnez t0, __kvm_mips_return_to_host - nop + /* XXXKYMA: not sure if this is safe, how large is the stack?? + * Now jump to the kvm_mips_handle_exit() to see if we can deal + * with this in the kernel */ + la t9, kvm_mips_handle_exit + jalr.hb t9 + addiu sp, sp, -CALLFRAME_SIZ /* BD Slot */ + + /* Return from handler Make sure interrupts are disabled */ + di + ehb + + /* XXXKYMA: k0/k1 could have been blown away if we processed + * an exception while we were handling the exception from the + * guest, reload k1 + */ + + move k1, s1 + addiu k1, k1, VCPU_HOST_ARCH + + /* Check return value, should tell us if we are returning to the + * host (handle I/O etc)or resuming the guest + */ + andi t0, v0, RESUME_HOST + bnez t0, __kvm_mips_return_to_host + nop __kvm_mips_return_to_guest: - /* Put the saved pointer to vcpu (s1) back into the DDATA_LO Register */ - mtc0 s1, CP0_DDATA_LO - - /* Load up the Guest EBASE to minimize the window where BEV is set */ - LONG_L t0, VCPU_GUEST_EBASE(k1) - - /* Switch EBASE back to the one used by KVM */ - mfc0 v1, CP0_STATUS - .set at - or k0, v1, ST0_BEV - .set noat - mtc0 k0, CP0_STATUS - ehb - mtc0 t0,CP0_EBASE - - /* Setup status register for running guest in UM */ - .set at - or v1, v1, (ST0_EXL | KSU_USER | ST0_IE) - and v1, v1, ~ST0_CU0 - .set noat - mtc0 v1, CP0_STATUS - ehb + /* Put the saved pointer to vcpu (s1) back into the DDATA_LO Register */ + mtc0 s1, CP0_DDATA_LO + /* Load up the Guest EBASE to minimize the window where BEV is set */ + LONG_L t0, VCPU_GUEST_EBASE(k1) + + /* Switch EBASE back to the one used by KVM */ + mfc0 v1, CP0_STATUS + .set at + or k0, v1, ST0_BEV + .set noat + mtc0 k0, CP0_STATUS + ehb + mtc0 t0, CP0_EBASE + + /* Setup status register for running guest in UM */ + .set at + or v1, v1, (ST0_EXL | KSU_USER | ST0_IE) + and v1, v1, ~ST0_CU0 + .set noat + mtc0 v1, CP0_STATUS + ehb /* Set Guest EPC */ - LONG_L t0, VCPU_PC(k1) - mtc0 t0, CP0_EPC - - /* Set the ASID for the Guest Kernel */ - sll t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ - /* addresses shift to 0x80000000 */ - bltz t0, 1f /* If kernel */ - addiu t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ - addiu t1, k1, VCPU_GUEST_USER_ASID /* else user */ + LONG_L t0, VCPU_PC(k1) + mtc0 t0, CP0_EPC + + /* Set the ASID for the Guest Kernel */ + sll t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ + /* addresses shift to 0x80000000 */ + bltz t0, 1f /* If kernel */ + addiu t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ + addiu t1, k1, VCPU_GUEST_USER_ASID /* else user */ 1: - /* t1: contains the base of the ASID array, need to get the cpu id */ - LONG_L t2, TI_CPU($28) /* smp_processor_id */ - sll t2, t2, 2 /* x4 */ - addu t3, t1, t2 - LONG_L k0, (t3) - andi k0, k0, 0xff - mtc0 k0,CP0_ENTRYHI - ehb - - /* Disable RDHWR access */ - mtc0 zero, CP0_HWRENA - - /* load the guest context from VCPU and return */ - LONG_L $0, VCPU_R0(k1) - LONG_L $1, VCPU_R1(k1) - LONG_L $2, VCPU_R2(k1) - LONG_L $3, VCPU_R3(k1) - LONG_L $4, VCPU_R4(k1) - LONG_L $5, VCPU_R5(k1) - LONG_L $6, VCPU_R6(k1) - LONG_L $7, VCPU_R7(k1) - LONG_L $8, VCPU_R8(k1) - LONG_L $9, VCPU_R9(k1) - LONG_L $10, VCPU_R10(k1) - LONG_L $11, VCPU_R11(k1) - LONG_L $12, VCPU_R12(k1) - LONG_L $13, VCPU_R13(k1) - LONG_L $14, VCPU_R14(k1) - LONG_L $15, VCPU_R15(k1) - LONG_L $16, VCPU_R16(k1) - LONG_L $17, VCPU_R17(k1) - LONG_L $18, VCPU_R18(k1) - LONG_L $19, VCPU_R19(k1) - LONG_L $20, VCPU_R20(k1) - LONG_L $21, VCPU_R21(k1) - LONG_L $22, VCPU_R22(k1) - LONG_L $23, VCPU_R23(k1) - LONG_L $24, VCPU_R24(k1) - LONG_L $25, VCPU_R25(k1) - - /* $/k1 loaded later */ - LONG_L $28, VCPU_R28(k1) - LONG_L $29, VCPU_R29(k1) - LONG_L $30, VCPU_R30(k1) - LONG_L $31, VCPU_R31(k1) + /* t1: contains the base of the ASID array, need to get the cpu id */ + LONG_L t2, TI_CPU($28) /* smp_processor_id */ + sll t2, t2, 2 /* x4 */ + addu t3, t1, t2 + LONG_L k0, (t3) + andi k0, k0, 0xff + mtc0 k0,CP0_ENTRYHI + ehb + + /* Disable RDHWR access */ + mtc0 zero, CP0_HWRENA + + /* load the guest context from VCPU and return */ + LONG_L $0, VCPU_R0(k1) + LONG_L $1, VCPU_R1(k1) + LONG_L $2, VCPU_R2(k1) + LONG_L $3, VCPU_R3(k1) + LONG_L $4, VCPU_R4(k1) + LONG_L $5, VCPU_R5(k1) + LONG_L $6, VCPU_R6(k1) + LONG_L $7, VCPU_R7(k1) + LONG_L $8, VCPU_R8(k1) + LONG_L $9, VCPU_R9(k1) + LONG_L $10, VCPU_R10(k1) + LONG_L $11, VCPU_R11(k1) + LONG_L $12, VCPU_R12(k1) + LONG_L $13, VCPU_R13(k1) + LONG_L $14, VCPU_R14(k1) + LONG_L $15, VCPU_R15(k1) + LONG_L $16, VCPU_R16(k1) + LONG_L $17, VCPU_R17(k1) + LONG_L $18, VCPU_R18(k1) + LONG_L $19, VCPU_R19(k1) + LONG_L $20, VCPU_R20(k1) + LONG_L $21, VCPU_R21(k1) + LONG_L $22, VCPU_R22(k1) + LONG_L $23, VCPU_R23(k1) + LONG_L $24, VCPU_R24(k1) + LONG_L $25, VCPU_R25(k1) + + /* $/k1 loaded later */ + LONG_L $28, VCPU_R28(k1) + LONG_L $29, VCPU_R29(k1) + LONG_L $30, VCPU_R30(k1) + LONG_L $31, VCPU_R31(k1) FEXPORT(__kvm_mips_skip_guest_restore) - LONG_L k0, VCPU_HI(k1) - mthi k0 + LONG_L k0, VCPU_HI(k1) + mthi k0 - LONG_L k0, VCPU_LO(k1) - mtlo k0 + LONG_L k0, VCPU_LO(k1) + mtlo k0 - LONG_L k0, VCPU_R26(k1) - LONG_L k1, VCPU_R27(k1) + LONG_L k0, VCPU_R26(k1) + LONG_L k1, VCPU_R27(k1) - eret + eret __kvm_mips_return_to_host: - /* EBASE is already pointing to Linux */ - LONG_L k1, VCPU_HOST_STACK(k1) - addiu k1,k1, -PT_SIZE - - /* Restore host DDATA_LO */ - LONG_L k0, PT_HOST_USERLOCAL(k1) - mtc0 k0, CP0_DDATA_LO - - /* Restore host ASID */ - LONG_L k0, PT_HOST_ASID(sp) - andi k0, 0xff - mtc0 k0,CP0_ENTRYHI - ehb - - /* Load context saved on the host stack */ - LONG_L $0, PT_R0(k1) - LONG_L $1, PT_R1(k1) - - /* r2/v0 is the return code, shift it down by 2 (arithmetic) to recover the err code */ - sra k0, v0, 2 - move $2, k0 - - LONG_L $3, PT_R3(k1) - LONG_L $4, PT_R4(k1) - LONG_L $5, PT_R5(k1) - LONG_L $6, PT_R6(k1) - LONG_L $7, PT_R7(k1) - LONG_L $8, PT_R8(k1) - LONG_L $9, PT_R9(k1) - LONG_L $10, PT_R10(k1) - LONG_L $11, PT_R11(k1) - LONG_L $12, PT_R12(k1) - LONG_L $13, PT_R13(k1) - LONG_L $14, PT_R14(k1) - LONG_L $15, PT_R15(k1) - LONG_L $16, PT_R16(k1) - LONG_L $17, PT_R17(k1) - LONG_L $18, PT_R18(k1) - LONG_L $19, PT_R19(k1) - LONG_L $20, PT_R20(k1) - LONG_L $21, PT_R21(k1) - LONG_L $22, PT_R22(k1) - LONG_L $23, PT_R23(k1) - LONG_L $24, PT_R24(k1) - LONG_L $25, PT_R25(k1) - - /* Host k0/k1 were not saved */ - - LONG_L $28, PT_R28(k1) - LONG_L $29, PT_R29(k1) - LONG_L $30, PT_R30(k1) - - LONG_L k0, PT_HI(k1) - mthi k0 - - LONG_L k0, PT_LO(k1) - mtlo k0 - - /* Restore RDHWR access */ - la k0, 0x2000000F - mtc0 k0, CP0_HWRENA - - - /* Restore RA, which is the address we will return to */ - LONG_L ra, PT_R31(k1) - j ra - nop - - .set pop + /* EBASE is already pointing to Linux */ + LONG_L k1, VCPU_HOST_STACK(k1) + addiu k1,k1, -PT_SIZE + + /* Restore host DDATA_LO */ + LONG_L k0, PT_HOST_USERLOCAL(k1) + mtc0 k0, CP0_DDATA_LO + + /* Restore host ASID */ + LONG_L k0, PT_HOST_ASID(sp) + andi k0, 0xff + mtc0 k0,CP0_ENTRYHI + ehb + + /* Load context saved on the host stack */ + LONG_L $0, PT_R0(k1) + LONG_L $1, PT_R1(k1) + + /* r2/v0 is the return code, shift it down by 2 (arithmetic) + * to recover the err code */ + sra k0, v0, 2 + move $2, k0 + + LONG_L $3, PT_R3(k1) + LONG_L $4, PT_R4(k1) + LONG_L $5, PT_R5(k1) + LONG_L $6, PT_R6(k1) + LONG_L $7, PT_R7(k1) + LONG_L $8, PT_R8(k1) + LONG_L $9, PT_R9(k1) + LONG_L $10, PT_R10(k1) + LONG_L $11, PT_R11(k1) + LONG_L $12, PT_R12(k1) + LONG_L $13, PT_R13(k1) + LONG_L $14, PT_R14(k1) + LONG_L $15, PT_R15(k1) + LONG_L $16, PT_R16(k1) + LONG_L $17, PT_R17(k1) + LONG_L $18, PT_R18(k1) + LONG_L $19, PT_R19(k1) + LONG_L $20, PT_R20(k1) + LONG_L $21, PT_R21(k1) + LONG_L $22, PT_R22(k1) + LONG_L $23, PT_R23(k1) + LONG_L $24, PT_R24(k1) + LONG_L $25, PT_R25(k1) + + /* Host k0/k1 were not saved */ + + LONG_L $28, PT_R28(k1) + LONG_L $29, PT_R29(k1) + LONG_L $30, PT_R30(k1) + + LONG_L k0, PT_HI(k1) + mthi k0 + + LONG_L k0, PT_LO(k1) + mtlo k0 + + /* Restore RDHWR access */ + la k0, 0x2000000F + mtc0 k0, CP0_HWRENA + + + /* Restore RA, which is the address we will return to */ + LONG_L ra, PT_R31(k1) + j ra + nop + + .set pop VECTOR_END(MIPSX(GuestExceptionEnd)) .end MIPSX(GuestException) @@ -627,24 +635,23 @@ MIPSX(exceptions): #define HW_SYNCI_Step $1 LEAF(MIPSX(SyncICache)) - .set push + .set push .set mips32r2 - beq a1, zero, 20f - nop - addu a1, a0, a1 - rdhwr v0, HW_SYNCI_Step - beq v0, zero, 20f - nop - + beq a1, zero, 20f + nop + addu a1, a0, a1 + rdhwr v0, HW_SYNCI_Step + beq v0, zero, 20f + nop 10: - synci 0(a0) - addu a0, a0, v0 - sltu v1, a0, a1 - bne v1, zero, 10b - nop - sync + synci 0(a0) + addu a0, a0, v0 + sltu v1, a0, a1 + bne v1, zero, 10b + nop + sync 20: - jr.hb ra - nop - .set pop + jr.hb ra + nop + .set pop END(MIPSX(SyncICache)) |