target-or32: Add MMU support

Add OpenRISC MMU support.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 205 insertions, 1 deletions

diff --git a/target-openrisc/mmu.c b/target-openrisc/mmu.c
index 1a72aaaf30..0be1d413c9 100644
--- a/target-openrisc/mmu.c
+++ b/target-openrisc/mmu.c
@@ -27,13 +27,217 @@
 #endif
 
 #ifndef CONFIG_USER_ONLY
+int cpu_openrisc_get_phys_nommu(OpenRISCCPU *cpu,
+                                target_phys_addr_t *physical,
+                                int *prot, target_ulong address, int rw)
+{
+    *physical = address;
+    *prot = PAGE_READ | PAGE_WRITE;
+    return TLBRET_MATCH;
+}
+
+int cpu_openrisc_get_phys_code(OpenRISCCPU *cpu,
+                               target_phys_addr_t *physical,
+                               int *prot, target_ulong address, int rw)
+{
+    int vpn = address >> TARGET_PAGE_BITS;
+    int idx = vpn & ITLB_MASK;
+    int right = 0;
+
+    if ((cpu->env.tlb->itlb[0][idx].mr >> TARGET_PAGE_BITS) != vpn) {
+        return TLBRET_NOMATCH;
+    }
+    if (!(cpu->env.tlb->itlb[0][idx].mr & 1)) {
+        return TLBRET_INVALID;
+    }
+
+    if (cpu->env.sr & SR_SM) { /* supervisor mode */
+        if (cpu->env.tlb->itlb[0][idx].tr & SXE) {
+            right |= PAGE_EXEC;
+        }
+    } else {
+        if (cpu->env.tlb->itlb[0][idx].tr & UXE) {
+            right |= PAGE_EXEC;
+        }
+    }
+
+    if ((rw & 2) && ((right & PAGE_EXEC) == 0)) {
+        return TLBRET_BADADDR;
+    }
+
+    *physical = (cpu->env.tlb->itlb[0][idx].tr & TARGET_PAGE_MASK) |
+                (address & (TARGET_PAGE_SIZE-1));
+    *prot = right;
+    return TLBRET_MATCH;
+}
+
+int cpu_openrisc_get_phys_data(OpenRISCCPU *cpu,
+                               target_phys_addr_t *physical,
+                               int *prot, target_ulong address, int rw)
+{
+    int vpn = address >> TARGET_PAGE_BITS;
+    int idx = vpn & DTLB_MASK;
+    int right = 0;
+
+    if ((cpu->env.tlb->dtlb[0][idx].mr >> TARGET_PAGE_BITS) != vpn) {
+        return TLBRET_NOMATCH;
+    }
+    if (!(cpu->env.tlb->dtlb[0][idx].mr & 1)) {
+        return TLBRET_INVALID;
+    }
+
+    if (cpu->env.sr & SR_SM) { /* supervisor mode */
+        if (cpu->env.tlb->dtlb[0][idx].tr & SRE) {
+            right |= PAGE_READ;
+        }
+        if (cpu->env.tlb->dtlb[0][idx].tr & SWE) {
+            right |= PAGE_WRITE;
+        }
+    } else {
+        if (cpu->env.tlb->dtlb[0][idx].tr & URE) {
+            right |= PAGE_READ;
+        }
+        if (cpu->env.tlb->dtlb[0][idx].tr & UWE) {
+            right |= PAGE_WRITE;
+        }
+    }
+
+    if ((rw & 0) && ((right & PAGE_READ) == 0)) {
+        return TLBRET_BADADDR;
+    }
+    if ((rw & 1) && ((right & PAGE_WRITE) == 0)) {
+        return TLBRET_BADADDR;
+    }
+
+    *physical = (cpu->env.tlb->dtlb[0][idx].tr & TARGET_PAGE_MASK) |
+                (address & (TARGET_PAGE_SIZE-1));
+    *prot = right;
+    return TLBRET_MATCH;
+}
+
+static int cpu_openrisc_get_phys_addr(OpenRISCCPU *cpu,
+                                      target_phys_addr_t *physical,
+                                      int *prot, target_ulong address,
+                                      int rw)
+{
+    int ret = TLBRET_MATCH;
+
+    /* [0x0000--0x2000]: unmapped */
+    if (address < 0x2000 && (cpu->env.sr & SR_SM)) {
+        *physical = address;
+        *prot = PAGE_READ | PAGE_WRITE;
+        return ret;
+    }
+
+    if (rw == 2) {    /* ITLB */
+       *physical = 0;
+        ret = cpu->env.tlb->cpu_openrisc_map_address_code(cpu, physical,
+                                                          prot, address, rw);
+    } else {          /* DTLB */
+        ret = cpu->env.tlb->cpu_openrisc_map_address_data(cpu, physical,
+                                                          prot, address, rw);
+    }
+
+    return ret;
+}
+#endif
+
+static void cpu_openrisc_raise_mmu_exception(OpenRISCCPU *cpu,
+                                             target_ulong address,
+                                             int rw, int tlb_error)
+{
+    int exception = 0;
+
+    switch (tlb_error) {
+    default:
+        if (rw == 2) {
+            exception = EXCP_IPF;
+        } else {
+            exception = EXCP_DPF;
+        }
+        break;
+#ifndef CONFIG_USER_ONLY
+    case TLBRET_BADADDR:
+        if (rw == 2) {
+            exception = EXCP_IPF;
+        } else {
+            exception = EXCP_DPF;
+        }
+        break;
+    case TLBRET_INVALID:
+    case TLBRET_NOMATCH:
+        /* No TLB match for a mapped address */
+        if (rw == 2) {
+            exception = EXCP_ITLBMISS;
+        } else {
+            exception = EXCP_DTLBMISS;
+        }
+        break;
+#endif
+    }
+
+    cpu->env.exception_index = exception;
+    cpu->env.eear = address;
+}
+
+#ifndef CONFIG_USER_ONLY
+int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env,
+                                  target_ulong address, int rw, int mmu_idx)
+{
+    int ret = 0;
+    target_phys_addr_t physical = 0;
+    int prot = 0;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    ret = cpu_openrisc_get_phys_addr(cpu, &physical, &prot,
+                                     address, rw);
+
+    if (ret == TLBRET_MATCH) {
+        tlb_set_page(env, address & TARGET_PAGE_MASK,
+                     physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
+                     mmu_idx, TARGET_PAGE_SIZE);
+        ret = 0;
+    } else if (ret < 0) {
+        cpu_openrisc_raise_mmu_exception(cpu, address, rw, ret);
+        ret = 1;
+    }
+
+    return ret;
+}
+#else
+int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env,
+                                  target_ulong address, int rw, int mmu_idx)
+{
+    int ret = 0;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    cpu_openrisc_raise_mmu_exception(cpu, address, rw, ret);
+    ret = 1;
+
+    return ret;
+}
+#endif
+
+#ifndef CONFIG_USER_ONLY
 target_phys_addr_t cpu_get_phys_page_debug(CPUOpenRISCState *env,
                                            target_ulong addr)
 {
-    return addr;
+    target_phys_addr_t phys_addr;
+    int prot;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    if (cpu_openrisc_get_phys_addr(cpu, &phys_addr, &prot, addr, 0)) {
+        return -1;
+    }
+
+    return phys_addr;
 }
 
 void cpu_openrisc_mmu_init(OpenRISCCPU *cpu)
 {
+    cpu->env.tlb = g_malloc0(sizeof(CPUOpenRISCTLBContext));
+
+    cpu->env.tlb->cpu_openrisc_map_address_code = &cpu_openrisc_get_phys_nommu;
+    cpu->env.tlb->cpu_openrisc_map_address_data = &cpu_openrisc_get_phys_nommu;
 }
 #endif