Add PSE-36 (36-bit page size extension) support

Code ported from PCBox

src/cpu/cpu.c

@@ -76,6 +76,7 @@ enum {
     CPUID_MCA       = (1 << 14), /* Machine Check Architecture */
     CPUID_CMOV      = (1 << 15), /* Conditional move instructions */
     CPUID_PAT       = (1 << 16), /* Page Attribute Table */
+    CPUID_PSE36     = (1 << 17), /* 36-bit Page Size Extension */
     CPUID_MMX       = (1 << 23), /* MMX technology */
     CPUID_FXSR      = (1 << 24)  /* FXSAVE and FXRSTOR instructions */
 };
@@ -1743,8 +1744,10 @@ cpu_set(void)
             if (cpu_s->cpu_type >= CPU_PENTIUM2)
                 cpu_features |= CPU_FEATURE_MMX;
             cpu_CR4_mask = CR4_VME | CR4_PVI | CR4_TSD | CR4_DE | CR4_PSE | CR4_MCE | CR4_PAE | CR4_PCE | CR4_PGE;
-            if (cpu_s->cpu_type == CPU_PENTIUM2D)
+            if (cpu_s->cpu_type == CPU_PENTIUM2D) {
                 cpu_CR4_mask |= CR4_OSFXSR;
+                cpu_features |= CPU_FEATURE_PSE36;
+            }
 
 #ifdef USE_DYNAREC
             codegen_timing_set(&codegen_timing_p6);
@@ -2489,7 +2492,7 @@ cpu_CPUID(void)
             } else if (EAX == 1) {
                 EAX = CPUID;
                 EBX = ECX = 0;
-                EDX       = CPUID_FPU | CPUID_VME | CPUID_DE | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_PAE | CPUID_MCE | CPUID_CMPXCHG8B | CPUID_MMX | CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_SEP | CPUID_FXSR | CPUID_CMOV;
+                EDX       = CPUID_FPU | CPUID_VME | CPUID_DE | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_PAE | CPUID_MCE | CPUID_CMPXCHG8B | CPUID_MMX | CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_SEP | CPUID_FXSR | CPUID_CMOV | CPUID_PSE36;
             } else if (EAX == 2) {
                 EAX = 0x03020101; /* Instruction TLB: 4 KB pages, 4-way set associative, 32 entries
                                      Instruction TLB: 4 MB pages, fully associative, 2 entries

src/cpu/cpu.h

@@ -530,6 +530,7 @@ extern int hasfpu;
 #define CPU_FEATURE_3DNOW   (1 << 6)
 #define CPU_FEATURE_SYSCALL (1 << 7)
 #define CPU_FEATURE_3DNOWE  (1 << 8)
+#define CPU_FEATURE_PSE36   (1 << 9)
 
 extern uint32_t cpu_features;
 

src/mem/mem.c

@@ -320,6 +320,7 @@ mmutranslatereal_normal(uint32_t addr, int rw)
 
     if ((temp & 0x80) && (cr4 & CR4_PSE)) {
         /*4MB page*/
+        uint64_t ret = temp & ~0x3fffff;
         if (((CPL == 3) && !(temp & 4) && !cpl_override) || (rw && !cpl_override && !(temp & 2) && (((CPL == 3) && !cpl_override) || ((is486 || isibm486) && (cr0 & WP_FLAG))))) {
             cr2 = addr;
             temp &= 1;
@@ -336,7 +337,10 @@ mmutranslatereal_normal(uint32_t addr, int rw)
         mmu_perm = temp & 4;
         rammap(addr2) |= (rw ? 0x60 : 0x20);
 
-        return (temp & ~0x3fffff) + (addr & 0x3fffff);
+        if (cpu_features & CPU_FEATURE_PSE36)
+            ret |= (uint64_t) (temp & 0x1e000) << 32;
+
+        return ret + (addr & 0x3fffff);
     }
 
     temp  = rammap((temp & ~0xfff) + ((addr >> 10) & 0xffc));
@@ -488,10 +492,14 @@ mmutranslate_noabrt_normal(uint32_t addr, int rw)
 
     if ((temp & 0x80) && (cr4 & CR4_PSE)) {
         /*4MB page*/
+        uint64_t ret = temp & ~0x3fffff;
         if (((CPL == 3) && !(temp & 4) && !cpl_override) || (rw && !cpl_override && !(temp & 2) && ((CPL == 3) || (cr0 & WP_FLAG))))
             return 0xffffffffffffffffULL;
 
-        return (temp & ~0x3fffff) + (addr & 0x3fffff);
+        if (cpu_features & CPU_FEATURE_PSE36)
+            ret |= (uint64_t) (temp & 0x1e000) << 32;
+
+        return ret + (addr & 0x3fffff);
     }
 
     temp  = rammap((temp & ~0xfff) + ((addr >> 10) & 0xffc));