- Initial checkin of the freebios2 tree

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/arch/i386/lib/cpu.c

@@ -0,0 +1,139 @@
+#include <console/console.h>
+#include <cpu/cpu.h>
+#include <mem.h>
+#include <arch/io.h>
+#include <string.h>
+#include <cpu/cpufixup.h>
+#include <smp/start_stop.h>
+#include <cpu/cpufixup.h>
+#include <cpu/p6/mtrr.h>
+#include <cpu/p6/msr.h>
+#include <cpu/p6/apic.h>
+#include <cpu/p5/cpuid.h>
+#if 0
+#include <cpu/l2_cache.h>
+#endif
+
+#if CONFIG_SMP || CONFIG_IOAPIC
+#define APIC 1
+#endif
+
+static void cache_on(struct mem_range *mem)
+{
+	post_code(0x60);
+	printk_info("Enabling cache...");
+
+
+	/* we need an #ifdef i586 here at some point ... */
+	__asm__ __volatile__("mov %cr0, %eax\n\t"
+			     "and $0x9fffffff,%eax\n\t"
+			     "mov %eax, %cr0\n\t");
+	/* turns out cache isn't really on until you set MTRR registers on 
+	 * 686 and later. 
+	 * NOTHING FANCY. Linux does a much better job anyway. 
+	 * so absolute minimum needed to get it going. 
+	 */
+	/* OK, linux it turns out does nothing. We have to do it ... */
+#if defined(i686) 
+	// totalram here is in linux sizing, i.e. units of KB. 
+	// set_mtrr is responsible for getting it into the right units!
+	setup_mtrrs(mem);
+#endif
+
+	post_code(0x6A);
+	printk_info("done.\n");
+}
+
+static void interrupts_on()
+{
+	/* this is so interrupts work. This is very limited scope -- 
+	 * linux will do better later, we hope ...
+	 */
+	/* this is the first way we learned to do it. It fails on real SMP 
+	 * stuff. So we have to do things differently ... 
+	 * see the Intel mp1.4 spec, page A-3
+	 */
+
+#if defined(APIC)
+	/* Only Pentium Pro and later have those MSR stuff */
+	unsigned long low, high;
+
+	printk_info("Setting up local apic...");
+
+	/* Enable the local apic */
+	rdmsr(APIC_BASE_MSR, low, high);
+	low |= APIC_BASE_MSR_ENABLE;
+	low &= ~APIC_BASE_MSR_ADDR_MASK;
+	low |= APIC_DEFAULT_BASE;
+	wrmsr(APIC_BASE_MSR, low, high);
+
+
+	/* Put the local apic in virtual wire mode */
+	apic_write_around(APIC_SPIV, 
+		(apic_read_around(APIC_SPIV) & ~(APIC_VECTOR_MASK))
+		| APIC_SPIV_ENABLE);
+	apic_write_around(APIC_LVT0, 
+		(apic_read_around(APIC_LVT0) & 
+			~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER | 
+				APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY | 
+				APIC_SEND_PENDING |APIC_LVT_RESERVED_1 |
+				APIC_DELIVERY_MODE_MASK))
+		| (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING | 
+			APIC_DELIVERY_MODE_EXTINT)
+		);
+	apic_write_around(APIC_LVT1, 
+		(apic_read_around(APIC_LVT1) & 
+			~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER | 
+				APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY | 
+				APIC_SEND_PENDING |APIC_LVT_RESERVED_1 |
+				APIC_DELIVERY_MODE_MASK))
+		| (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING | 
+			APIC_DELIVERY_MODE_NMI)
+		);
+#else /* APIC */
+#ifdef i686
+	/* Only Pentium Pro and later have those MSR stuff */
+	unsigned long low, high;
+
+	printk_info("Disabling local apic...");
+
+	rdmsr(APIC_BASE_MSR, low, high);
+	low &= ~APIC_BASE_MSR_ENABLE;
+	wrmsr(APIC_BASE_MSR, low, high);
+#endif /* i686 */
+#endif /* APIC */
+	printk_info("done.\n");
+	post_code(0x9b);
+}
+
+unsigned long cpu_initialize(struct mem_range *mem)
+{
+	/* Because we busy wait at the printk spinlock.
+	 * It is important to keep the number of printed messages
+	 * from secondary cpus to a minimum, when debugging is
+	 * disabled.
+	 */
+	unsigned long processor_id = this_processors_id();
+	printk_notice("Initializing CPU #%d\n", processor_id);
+	
+	/* some cpus need a fixup done. This is the hook for doing that. */
+	cpufixup(mem);
+
+	/* Turn on caching if we haven't already */
+	cache_on(mem);
+
+	display_cpuid();
+	mtrr_check();
+
+#if 0
+	/* now that everything is really up, enable the l2 cache if desired. 
+	 * The enable can wait until this point, because linuxbios and it's
+	 * data areas are tiny, easily fitting into the L1 cache. 
+	 */
+	configure_l2_cache();
+#endif
+	interrupts_on();
+	printk_info("CPU #%d Initialized\n", processor_id);
+	return processor_id;
+}
+