| /* |
| * MIPS TLB (Translation lookaside buffer) helpers. |
| * |
| * Copyright (c) 2004-2005 Jocelyn Mayer |
| * |
| * 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 2.1 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 "cpu.h" |
| #include "exec/exec-all.h" |
| #include "exec/page-protection.h" |
| #include "../internal.h" |
| |
| static int is_seg_am_mapped(unsigned int am, bool eu, int mmu_idx) |
| { |
| /* |
| * Interpret access control mode and mmu_idx. |
| * AdE? TLB? |
| * AM K S U E K S U E |
| * UK 0 0 1 1 0 0 - - 0 |
| * MK 1 0 1 1 0 1 - - !eu |
| * MSK 2 0 0 1 0 1 1 - !eu |
| * MUSK 3 0 0 0 0 1 1 1 !eu |
| * MUSUK 4 0 0 0 0 0 1 1 0 |
| * USK 5 0 0 1 0 0 0 - 0 |
| * - 6 - - - - - - - - |
| * UUSK 7 0 0 0 0 0 0 0 0 |
| */ |
| int32_t adetlb_mask; |
| |
| switch (mmu_idx) { |
| case 3: /* ERL */ |
| /* If EU is set, always unmapped */ |
| if (eu) { |
| return 0; |
| } |
| /* fall through */ |
| case MIPS_HFLAG_KM: |
| /* Never AdE, TLB mapped if AM={1,2,3} */ |
| adetlb_mask = 0x70000000; |
| goto check_tlb; |
| |
| case MIPS_HFLAG_SM: |
| /* AdE if AM={0,1}, TLB mapped if AM={2,3,4} */ |
| adetlb_mask = 0xc0380000; |
| goto check_ade; |
| |
| case MIPS_HFLAG_UM: |
| /* AdE if AM={0,1,2,5}, TLB mapped if AM={3,4} */ |
| adetlb_mask = 0xe4180000; |
| /* fall through */ |
| check_ade: |
| /* does this AM cause AdE in current execution mode */ |
| if ((adetlb_mask << am) < 0) { |
| return TLBRET_BADADDR; |
| } |
| adetlb_mask <<= 8; |
| /* fall through */ |
| check_tlb: |
| /* is this AM mapped in current execution mode */ |
| return ((adetlb_mask << am) < 0); |
| default: |
| g_assert_not_reached(); |
| }; |
| } |
| |
| static int get_seg_physical_address(CPUMIPSState *env, hwaddr *physical, |
| int *prot, target_ulong real_address, |
| MMUAccessType access_type, int mmu_idx, |
| unsigned int am, bool eu, |
| target_ulong segmask, |
| hwaddr physical_base) |
| { |
| int mapped = is_seg_am_mapped(am, eu, mmu_idx); |
| |
| if (mapped < 0) { |
| /* is_seg_am_mapped can report TLBRET_BADADDR */ |
| return mapped; |
| } else if (mapped) { |
| /* The segment is TLB mapped */ |
| return env->tlb->map_address(env, physical, prot, real_address, |
| access_type); |
| } else { |
| /* The segment is unmapped */ |
| *physical = physical_base | (real_address & segmask); |
| *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| return TLBRET_MATCH; |
| } |
| } |
| |
| static int get_segctl_physical_address(CPUMIPSState *env, hwaddr *physical, |
| int *prot, target_ulong real_address, |
| MMUAccessType access_type, int mmu_idx, |
| uint16_t segctl, target_ulong segmask) |
| { |
| unsigned int am = (segctl & CP0SC_AM_MASK) >> CP0SC_AM; |
| bool eu = (segctl >> CP0SC_EU) & 1; |
| hwaddr pa = ((hwaddr)segctl & CP0SC_PA_MASK) << 20; |
| |
| return get_seg_physical_address(env, physical, prot, real_address, |
| access_type, mmu_idx, am, eu, segmask, |
| pa & ~(hwaddr)segmask); |
| } |
| |
| int get_physical_address(CPUMIPSState *env, hwaddr *physical, |
| int *prot, target_ulong real_address, |
| MMUAccessType access_type, int mmu_idx) |
| { |
| /* User mode can only access useg/xuseg */ |
| #if defined(TARGET_MIPS64) |
| int user_mode = mmu_idx == MIPS_HFLAG_UM; |
| int supervisor_mode = mmu_idx == MIPS_HFLAG_SM; |
| int kernel_mode = !user_mode && !supervisor_mode; |
| int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; |
| int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0; |
| int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; |
| #endif |
| int ret = TLBRET_MATCH; |
| /* effective address (modified for KVM T&E kernel segments) */ |
| target_ulong address = real_address; |
| |
| if (address <= USEG_LIMIT) { |
| /* useg */ |
| uint16_t segctl; |
| |
| if (address >= 0x40000000UL) { |
| segctl = env->CP0_SegCtl2; |
| } else { |
| segctl = env->CP0_SegCtl2 >> 16; |
| } |
| ret = get_segctl_physical_address(env, physical, prot, |
| real_address, access_type, |
| mmu_idx, segctl, 0x3FFFFFFF); |
| #if defined(TARGET_MIPS64) |
| } else if (address < 0x4000000000000000ULL) { |
| /* xuseg */ |
| if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, |
| real_address, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0x8000000000000000ULL) { |
| /* xsseg */ |
| if ((supervisor_mode || kernel_mode) && |
| SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, |
| real_address, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0xC000000000000000ULL) { |
| /* xkphys */ |
| if ((address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) { |
| /* KX/SX/UX bit to check for each xkphys EVA access mode */ |
| static const uint8_t am_ksux[8] = { |
| [CP0SC_AM_UK] = (1u << CP0St_KX), |
| [CP0SC_AM_MK] = (1u << CP0St_KX), |
| [CP0SC_AM_MSK] = (1u << CP0St_SX), |
| [CP0SC_AM_MUSK] = (1u << CP0St_UX), |
| [CP0SC_AM_MUSUK] = (1u << CP0St_UX), |
| [CP0SC_AM_USK] = (1u << CP0St_SX), |
| [6] = (1u << CP0St_KX), |
| [CP0SC_AM_UUSK] = (1u << CP0St_UX), |
| }; |
| unsigned int am = CP0SC_AM_UK; |
| unsigned int xr = (env->CP0_SegCtl2 & CP0SC2_XR_MASK) >> CP0SC2_XR; |
| |
| if (xr & (1 << ((address >> 59) & 0x7))) { |
| am = (env->CP0_SegCtl1 & CP0SC1_XAM_MASK) >> CP0SC1_XAM; |
| } |
| /* Does CP0_Status.KX/SX/UX permit the access mode (am) */ |
| if (env->CP0_Status & am_ksux[am]) { |
| ret = get_seg_physical_address(env, physical, prot, |
| real_address, access_type, |
| mmu_idx, am, false, env->PAMask, |
| 0); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0xFFFFFFFF80000000ULL) { |
| /* xkseg */ |
| if (kernel_mode && KX && |
| address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, |
| real_address, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| #endif |
| } else if (address < KSEG1_BASE) { |
| /* kseg0 */ |
| ret = get_segctl_physical_address(env, physical, prot, real_address, |
| access_type, mmu_idx, |
| env->CP0_SegCtl1 >> 16, 0x1FFFFFFF); |
| } else if (address < KSEG2_BASE) { |
| /* kseg1 */ |
| ret = get_segctl_physical_address(env, physical, prot, real_address, |
| access_type, mmu_idx, |
| env->CP0_SegCtl1, 0x1FFFFFFF); |
| } else if (address < KSEG3_BASE) { |
| /* sseg (kseg2) */ |
| ret = get_segctl_physical_address(env, physical, prot, real_address, |
| access_type, mmu_idx, |
| env->CP0_SegCtl0 >> 16, 0x1FFFFFFF); |
| } else { |
| /* |
| * kseg3 |
| * XXX: debug segment is not emulated |
| */ |
| ret = get_segctl_physical_address(env, physical, prot, real_address, |
| access_type, mmu_idx, |
| env->CP0_SegCtl0, 0x1FFFFFFF); |
| } |
| return ret; |
| } |
| |
| hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) |
| { |
| CPUMIPSState *env = cpu_env(cs); |
| hwaddr phys_addr; |
| int prot; |
| |
| if (get_physical_address(env, &phys_addr, &prot, addr, MMU_DATA_LOAD, |
| mips_env_mmu_index(env)) != 0) { |
| return -1; |
| } |
| return phys_addr; |
| } |
