| /* |
| * PowerPC Radix MMU mulation helpers for QEMU. |
| * |
| * Copyright (c) 2016 Suraj Jitindar Singh, IBM Corporation |
| * |
| * 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 "qapi/error.h" |
| #include "cpu.h" |
| #include "exec/exec-all.h" |
| #include "exec/helper-proto.h" |
| #include "qemu/error-report.h" |
| #include "sysemu/kvm.h" |
| #include "kvm_ppc.h" |
| #include "exec/log.h" |
| #include "mmu-radix64.h" |
| #include "mmu-book3s-v3.h" |
| |
| static bool ppc_radix64_get_fully_qualified_addr(CPUPPCState *env, vaddr eaddr, |
| uint64_t *lpid, uint64_t *pid) |
| { |
| /* We don't have HV support yet and shouldn't get here with it set anyway */ |
| assert(!msr_hv); |
| |
| if (!msr_hv) { /* !MSR[HV] -> Guest */ |
| switch (eaddr & R_EADDR_QUADRANT) { |
| case R_EADDR_QUADRANT0: /* Guest application */ |
| *lpid = env->spr[SPR_LPIDR]; |
| *pid = env->spr[SPR_BOOKS_PID]; |
| break; |
| case R_EADDR_QUADRANT1: /* Illegal */ |
| case R_EADDR_QUADRANT2: |
| return false; |
| case R_EADDR_QUADRANT3: /* Guest OS */ |
| *lpid = env->spr[SPR_LPIDR]; |
| *pid = 0; /* pid set to 0 -> addresses guest operating system */ |
| break; |
| } |
| } |
| |
| return true; |
| } |
| |
| static void ppc_radix64_raise_segi(PowerPCCPU *cpu, int rwx, vaddr eaddr) |
| { |
| CPUState *cs = CPU(cpu); |
| CPUPPCState *env = &cpu->env; |
| |
| if (rwx == 2) { /* Instruction Segment Interrupt */ |
| cs->exception_index = POWERPC_EXCP_ISEG; |
| } else { /* Data Segment Interrupt */ |
| cs->exception_index = POWERPC_EXCP_DSEG; |
| env->spr[SPR_DAR] = eaddr; |
| } |
| env->error_code = 0; |
| } |
| |
| static void ppc_radix64_raise_si(PowerPCCPU *cpu, int rwx, vaddr eaddr, |
| uint32_t cause) |
| { |
| CPUState *cs = CPU(cpu); |
| CPUPPCState *env = &cpu->env; |
| |
| if (rwx == 2) { /* Instruction Storage Interrupt */ |
| cs->exception_index = POWERPC_EXCP_ISI; |
| env->error_code = cause; |
| } else { /* Data Storage Interrupt */ |
| cs->exception_index = POWERPC_EXCP_DSI; |
| if (rwx == 1) { /* Write -> Store */ |
| cause |= DSISR_ISSTORE; |
| } |
| env->spr[SPR_DSISR] = cause; |
| env->spr[SPR_DAR] = eaddr; |
| env->error_code = 0; |
| } |
| } |
| |
| |
| static bool ppc_radix64_check_prot(PowerPCCPU *cpu, int rwx, uint64_t pte, |
| int *fault_cause, int *prot) |
| { |
| CPUPPCState *env = &cpu->env; |
| const int need_prot[] = { PAGE_READ, PAGE_WRITE, PAGE_EXEC }; |
| |
| /* Check Page Attributes (pte58:59) */ |
| if (((pte & R_PTE_ATT) == R_PTE_ATT_NI_IO) && (rwx == 2)) { |
| /* |
| * Radix PTE entries with the non-idempotent I/O attribute are treated |
| * as guarded storage |
| */ |
| *fault_cause |= SRR1_NOEXEC_GUARD; |
| return true; |
| } |
| |
| /* Determine permissions allowed by Encoded Access Authority */ |
| if ((pte & R_PTE_EAA_PRIV) && msr_pr) { /* Insufficient Privilege */ |
| *prot = 0; |
| } else if (msr_pr || (pte & R_PTE_EAA_PRIV)) { |
| *prot = ppc_radix64_get_prot_eaa(pte); |
| } else { /* !msr_pr && !(pte & R_PTE_EAA_PRIV) */ |
| *prot = ppc_radix64_get_prot_eaa(pte); |
| *prot &= ppc_radix64_get_prot_amr(cpu); /* Least combined permissions */ |
| } |
| |
| /* Check if requested access type is allowed */ |
| if (need_prot[rwx] & ~(*prot)) { /* Page Protected for that Access */ |
| *fault_cause |= DSISR_PROTFAULT; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void ppc_radix64_set_rc(PowerPCCPU *cpu, int rwx, uint64_t pte, |
| hwaddr pte_addr, int *prot) |
| { |
| CPUState *cs = CPU(cpu); |
| uint64_t npte; |
| |
| npte = pte | R_PTE_R; /* Always set reference bit */ |
| |
| if (rwx == 1) { /* Store/Write */ |
| npte |= R_PTE_C; /* Set change bit */ |
| } else { |
| /* |
| * Treat the page as read-only for now, so that a later write |
| * will pass through this function again to set the C bit. |
| */ |
| *prot &= ~PAGE_WRITE; |
| } |
| |
| if (pte ^ npte) { /* If pte has changed then write it back */ |
| stq_phys(cs->as, pte_addr, npte); |
| } |
| } |
| |
| static uint64_t ppc_radix64_walk_tree(PowerPCCPU *cpu, vaddr eaddr, |
| uint64_t base_addr, uint64_t nls, |
| hwaddr *raddr, int *psize, |
| int *fault_cause, hwaddr *pte_addr) |
| { |
| CPUState *cs = CPU(cpu); |
| uint64_t index, pde; |
| |
| if (nls < 5) { /* Directory maps less than 2**5 entries */ |
| *fault_cause |= DSISR_R_BADCONFIG; |
| return 0; |
| } |
| |
| /* Read page <directory/table> entry from guest address space */ |
| index = eaddr >> (*psize - nls); /* Shift */ |
| index &= ((1UL << nls) - 1); /* Mask */ |
| pde = ldq_phys(cs->as, base_addr + (index * sizeof(pde))); |
| if (!(pde & R_PTE_VALID)) { /* Invalid Entry */ |
| *fault_cause |= DSISR_NOPTE; |
| return 0; |
| } |
| |
| *psize -= nls; |
| |
| /* Check if Leaf Entry -> Page Table Entry -> Stop the Search */ |
| if (pde & R_PTE_LEAF) { |
| uint64_t rpn = pde & R_PTE_RPN; |
| uint64_t mask = (1UL << *psize) - 1; |
| |
| /* Or high bits of rpn and low bits to ea to form whole real addr */ |
| *raddr = (rpn & ~mask) | (eaddr & mask); |
| *pte_addr = base_addr + (index * sizeof(pde)); |
| return pde; |
| } |
| |
| /* Next Level of Radix Tree */ |
| return ppc_radix64_walk_tree(cpu, eaddr, pde & R_PDE_NLB, pde & R_PDE_NLS, |
| raddr, psize, fault_cause, pte_addr); |
| } |
| |
| int ppc_radix64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr, int rwx, |
| int mmu_idx) |
| { |
| CPUState *cs = CPU(cpu); |
| CPUPPCState *env = &cpu->env; |
| PPCVirtualHypervisorClass *vhc = |
| PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp); |
| hwaddr raddr, pte_addr; |
| uint64_t lpid = 0, pid = 0, offset, size, patbe, prtbe0, pte; |
| int page_size, prot, fault_cause = 0; |
| |
| assert((rwx == 0) || (rwx == 1) || (rwx == 2)); |
| assert(!msr_hv); /* For now there is no Radix PowerNV Support */ |
| assert(cpu->vhyp); |
| assert(ppc64_use_proc_tbl(cpu)); |
| |
| /* Real Mode Access */ |
| if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) { |
| /* In real mode top 4 effective addr bits (mostly) ignored */ |
| raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL; |
| |
| tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK, |
| PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx, |
| TARGET_PAGE_SIZE); |
| return 0; |
| } |
| |
| /* Virtual Mode Access - get the fully qualified address */ |
| if (!ppc_radix64_get_fully_qualified_addr(env, eaddr, &lpid, &pid)) { |
| ppc_radix64_raise_segi(cpu, rwx, eaddr); |
| return 1; |
| } |
| |
| /* Get Process Table */ |
| patbe = vhc->get_patbe(cpu->vhyp); |
| |
| /* Index Process Table by PID to Find Corresponding Process Table Entry */ |
| offset = pid * sizeof(struct prtb_entry); |
| size = 1ULL << ((patbe & PATBE1_R_PRTS) + 12); |
| if (offset >= size) { |
| /* offset exceeds size of the process table */ |
| ppc_radix64_raise_si(cpu, rwx, eaddr, DSISR_NOPTE); |
| return 1; |
| } |
| prtbe0 = ldq_phys(cs->as, (patbe & PATBE1_R_PRTB) + offset); |
| |
| /* Walk Radix Tree from Process Table Entry to Convert EA to RA */ |
| page_size = PRTBE_R_GET_RTS(prtbe0); |
| pte = ppc_radix64_walk_tree(cpu, eaddr & R_EADDR_MASK, |
| prtbe0 & PRTBE_R_RPDB, prtbe0 & PRTBE_R_RPDS, |
| &raddr, &page_size, &fault_cause, &pte_addr); |
| if (!pte || ppc_radix64_check_prot(cpu, rwx, pte, &fault_cause, &prot)) { |
| /* Couldn't get pte or access denied due to protection */ |
| ppc_radix64_raise_si(cpu, rwx, eaddr, fault_cause); |
| return 1; |
| } |
| |
| /* Update Reference and Change Bits */ |
| ppc_radix64_set_rc(cpu, rwx, pte, pte_addr, &prot); |
| |
| tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK, |
| prot, mmu_idx, 1UL << page_size); |
| return 0; |
| } |
| |
| hwaddr ppc_radix64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong eaddr) |
| { |
| CPUState *cs = CPU(cpu); |
| CPUPPCState *env = &cpu->env; |
| PPCVirtualHypervisorClass *vhc = |
| PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp); |
| hwaddr raddr, pte_addr; |
| uint64_t lpid = 0, pid = 0, offset, size, patbe, prtbe0, pte; |
| int page_size, fault_cause = 0; |
| |
| /* Handle Real Mode */ |
| if (msr_dr == 0) { |
| /* In real mode top 4 effective addr bits (mostly) ignored */ |
| return eaddr & 0x0FFFFFFFFFFFFFFFULL; |
| } |
| |
| /* Virtual Mode Access - get the fully qualified address */ |
| if (!ppc_radix64_get_fully_qualified_addr(env, eaddr, &lpid, &pid)) { |
| return -1; |
| } |
| |
| /* Get Process Table */ |
| patbe = vhc->get_patbe(cpu->vhyp); |
| |
| /* Index Process Table by PID to Find Corresponding Process Table Entry */ |
| offset = pid * sizeof(struct prtb_entry); |
| size = 1ULL << ((patbe & PATBE1_R_PRTS) + 12); |
| if (offset >= size) { |
| /* offset exceeds size of the process table */ |
| return -1; |
| } |
| prtbe0 = ldq_phys(cs->as, (patbe & PATBE1_R_PRTB) + offset); |
| |
| /* Walk Radix Tree from Process Table Entry to Convert EA to RA */ |
| page_size = PRTBE_R_GET_RTS(prtbe0); |
| pte = ppc_radix64_walk_tree(cpu, eaddr & R_EADDR_MASK, |
| prtbe0 & PRTBE_R_RPDB, prtbe0 & PRTBE_R_RPDS, |
| &raddr, &page_size, &fault_cause, &pte_addr); |
| if (!pte) { |
| return -1; |
| } |
| |
| return raddr & TARGET_PAGE_MASK; |
| } |
