patch-2.4.0-test2 linux/arch/i386/kernel/setup.c

• Lines: 280
• Date: Wed Jun 21 20:59:38 2000
• Orig file: v2.4.0-test1/linux/arch/i386/kernel/setup.c
• Orig date: Mon Jun 19 16:31:57 2000

diff -u --recursive --new-file v2.4.0-test1/linux/arch/i386/kernel/setup.c linux/arch/i386/kernel/setup.c
@@ -39,8 +39,10 @@
  *  Detection for Celeron coppermine, identify_cpu() overhauled,
  *  and a few other clean ups.
  *  Dave Jones <dave@powertweak.com>, April 2000
- *  Pentium-III code by Ingo Molnar and modifications by Goutham Rao
  *
+ *  Pentium III FXSR, SSE support
+ *  General FPU state handling cleanups
+ *	Gareth Hughes <gareth@valinux.com>, May 2000
  */
 
 /*
@@ -373,24 +375,6 @@
 	}
 }
 
-unsigned long __init memparse(char *ptr, char **retptr)
-{
-	unsigned long ret;
-
-	ret = simple_strtoul(ptr, retptr, 0);
-
-	if (**retptr == 'K' || **retptr == 'k') {
-		ret <<= 10;
-		(*retptr)++;
-	}
-	else if (**retptr == 'M' || **retptr == 'm') {
-		ret <<= 20;
-		(*retptr)++;
-	}
-	return ret;
-} /* memparse */
-
-
 void __init add_memory_region(unsigned long start,
                                   unsigned long size, int type)
 {
@@ -528,6 +512,7 @@
 				else {
 					start_at = HIGH_MEMORY;
 					mem_size -= HIGH_MEMORY;
+					usermem=0;
 				}
 				add_memory_region(start_at, mem_size, E820_RAM);
 			}
@@ -801,20 +786,6 @@
 	conswitchp = &dummy_con;
 #endif
 #endif
-#ifdef CONFIG_X86_FX
-	if (boot_cpu_data.x86_capability & X86_FEATURE_FXSR)
-	{
-		printk("Enabling extended fast FPU save and restore ... ");
-		set_in_cr4(X86_CR4_OSFXSR);
-		printk("done.\n");
-	}
-	if (boot_cpu_data.x86_capability & X86_FEATURE_XMM) 
-	{
-		printk("Enabling KNI unmasked exception support ... ");
-		set_in_cr4(X86_CR4_OSXMMEXCPT);
-		printk("done.\n");
-	}
-#endif
 }
 
 static int __init get_model_name(struct cpuinfo_x86 *c)
@@ -921,8 +892,8 @@
 	cpuid(0x80000000, &n, &dummy, &dummy, &dummy);
 	if (n >= 0x80000005) {
 		cpuid(0x80000005, &dummy, &dummy, &ecx, &edx);
-		printk("CPU: L1 I Cache: %dK  L1 D Cache: %dK\n",
-			ecx>>24, edx>>24);
+		printk("CPU: L1 I Cache: %dK  L1 D Cache: %dK (%d bytes/line)\n",
+			edx>>24, ecx>>24, edx&0xFF);
 		c->x86_cache_size=(ecx>>24)+(edx>>24);	
 	}
 	if (n >= 0x80000006) {
@@ -1155,6 +1126,8 @@
 		name="C6";
 		fcr_set=ECX8|DSMC|EDCTLB|EMMX|ERETSTK;
 		fcr_clr=DPDC;
+		printk("Disabling bugged TSC.\n");
+		c->x86_capability &= ~X86_FEATURE_TSC;
 		break;
 	case 8:
 		switch(c->x86_mask) {
@@ -1337,8 +1310,8 @@
 	{ X86_VENDOR_INTEL,	6,
 	  { "Pentium Pro A-step", "Pentium Pro", NULL, "Pentium II (Klamath)", 
 	    NULL, "Pentium II (Deschutes)", "Mobile Pentium II",
-	    "Pentium III (Katmai)", "Pentium III (Coppermine)", NULL, NULL, 
-	    NULL, NULL, NULL, NULL }},
+	    "Pentium III (Katmai)", "Pentium III (Coppermine)", NULL,
+	    "Pentium III (Cascades)", NULL, NULL, NULL, NULL }},
 	{ X86_VENDOR_AMD,	4,
 	  { NULL, NULL, NULL, "486 DX/2", NULL, NULL, NULL, "486 DX/2-WB",
 	    "486 DX/4", "486 DX/4-WB", NULL, NULL, NULL, NULL, "Am5x86-WT",
@@ -1350,7 +1323,7 @@
 	    "K6-3", NULL, NULL, NULL, NULL, NULL, NULL }},
 	{ X86_VENDOR_AMD,	6,
 	  { "Athlon", "Athlon",
-	    NULL, NULL, NULL, NULL,
+	    "Athlon", NULL, "Athlon", NULL,
 	    NULL, NULL, NULL,
 	    NULL, NULL, NULL, NULL, NULL, NULL, NULL }},
 	{ X86_VENDOR_UMC,	4,
@@ -1367,17 +1340,30 @@
 	    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }},
 };
 
-void __init identify_cpu(struct cpuinfo_x86 *c)
+/*
+ *	Detect a NexGen CPU running without BIOS hypercode new enough
+ *	to have CPUID. (Thanks to Herbert Oppmann)
+ */
+ 
+static int deep_magic_nexgen_probe(void)
 {
-	int i=0;
-	char *p = NULL;
-
-	c->loops_per_sec = loops_per_sec;
-	c->x86_cache_size = -1;
-
-	get_cpu_vendor(c);
+	int ret;
+	
+	__asm__ __volatile__ (
+		"	movw	$0x5555, %%ax\n"
+		"	xorw	%%dx,%%dx\n"
+		"	movw	$2, %%cx\n"
+		"	divw	%%cx\n"
+		"	movl	$0, %%eax\n"
+		"	jnz	1f\n"
+		"	movl	$1, %%eax\n"
+		"1:\n" 
+		: "=a" (ret) : : "cx", "dx" );
+	return  ret;
+}
 
-	/* It should be possible for the user to override this. */
+static void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
+{
 	if(c->x86_capability&(1<<18)) {
 		/* Disable processor serial number */
 		unsigned long lo,hi;
@@ -1386,12 +1372,32 @@
 		wrmsr(0x119,lo,hi);
 		printk(KERN_INFO "CPU serial number disabled.\n");
 	}
+}
+
+void __init identify_cpu(struct cpuinfo_x86 *c)
+{
+	int i=0;
+	char *p = NULL;
+
+	c->loops_per_sec = loops_per_sec;
+	c->x86_cache_size = -1;
+
+	get_cpu_vendor(c);
+
 
 	switch (c->x86_vendor) {
 
 		case X86_VENDOR_UNKNOWN:
 			if (c->cpuid_level < 0)
+			{
+				/* It may be a nexgen with cpuid disabled.. */
+				if(deep_magic_nexgen_probe())
+				{
+					strcpy(c->x86_model_id, "Nx586");
+					c->x86_vendor = X86_VENDOR_NEXGEN;
+				}
 				return;
+			}
 			break;
 
 		case X86_VENDOR_CYRIX:
@@ -1408,6 +1414,9 @@
 			return;
 
 		case X86_VENDOR_INTEL:
+			
+			squash_the_stupid_serial_number(c);
+			
 			if (c->cpuid_level > 1) {
 				/* supports eax=2  call */
 				int edx, dummy;
@@ -1422,24 +1431,26 @@
 					c->x86_cache_size = 0;
 					break;
 
-				case 0x41:
+				case 0x41: /* 4-way 128 */
 					c->x86_cache_size = 128;
 					break;
 
-				case 0x42:
-				case 0x82: /*Detect 256-Kbyte cache on Coppermine*/
+				case 0x42: /* 4-way 256 */
+				case 0x82: /* 8-way 256 */
 					c->x86_cache_size = 256;
 					break;
 
-				case 0x43:
+				case 0x43: /* 4-way 512 */
 					c->x86_cache_size = 512;
 					break;
 
-				case 0x44:
+				case 0x44: /* 4-way 1024 */
+				case 0x84: /* 8-way 1024 */
 					c->x86_cache_size = 1024;
 					break;
 
-				case 0x45:
+				case 0x45: /* 4-way 2048 */
+				case 0x85: /* 8-way 2048 */
 					c->x86_cache_size = 2048;
 					break;
 
@@ -1479,9 +1490,14 @@
 
 		case X86_VENDOR_TRANSMETA:
 			transmeta_model(c);
+			squash_the_stupid_serial_number(c);
 			return;
 	}
 	
+	/* may be changed in the switch so needs to be after */
+	
+	if(c->x86_vendor == X86_VENDOR_NEXGEN)
+		c->x86_cache_size = 256;	/* A few had 1Mb.. */
 	
 	for (i = 0; i < sizeof(cpu_models)/sizeof(struct cpu_model_info); i++) {
 		if (cpu_models[i].vendor == c->x86_vendor &&
@@ -1614,7 +1630,9 @@
 					x86_cap_flags[10] = "sep";
 				if (c->x86 < 6)
 					x86_cap_flags[16] = "fcmov";
+				x86_cap_flags[16] = "pat";
 				x86_cap_flags[22] = "mmxext";
+				x86_cap_flags[24] = "fxsr";
 				x86_cap_flags[30] = "3dnowext";
 				x86_cap_flags[31] = "3dnow";
 				break;
@@ -1674,6 +1692,18 @@
 	return p - buffer;
 }
 
+#ifndef CONFIG_X86_TSC
+static int tsc_disable __initdata = 0;
+
+static int __init tsc_setup(char *str)
+{
+	tsc_disable = 1;
+	return 1;
+}
+
+__setup("notsc", tsc_setup);
+#endif
+
 static unsigned long cpu_initialized __initdata = 0;
 
 /*
@@ -1695,6 +1725,13 @@
 
 	if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
 		clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
+#ifndef CONFIG_X86_TSC
+	if (tsc_disable && cpu_has_tsc) {
+		printk("Disabling TSC...\n");
+		boot_cpu_data.x86_capability &= ~X86_FEATURE_TSC;
+		set_in_cr4(X86_CR4_TSD);
+	}
+#endif
 
 	__asm__ __volatile__("lgdt %0": "=m" (gdt_descr));
 	__asm__ __volatile__("lidt %0": "=m" (idt_descr));