avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/x86/cpu/lapic.c

@@ -0,0 +1,159 @@
+/*
+ * From coreboot file of same name
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/lapic.h>
+#include <asm/msr.h>
+#include <asm/msr-index.h>
+#include <asm/post.h>
+
+unsigned long lapic_read(unsigned long reg)
+{
+	return readl(LAPIC_DEFAULT_BASE + reg);
+}
+
+#define xchg(ptr, v)	((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), \
+						    sizeof(*(ptr))))
+
+struct __xchg_dummy	{ unsigned long a[100]; };
+#define __xg(x)		((struct __xchg_dummy *)(x))
+
+/*
+ * Note: no "lock" prefix even on SMP. xchg always implies lock anyway.
+ *
+ * Note 2: xchg has side effect, so that attribute volatile is necessary,
+ *         but generally the primitive is invalid, *ptr is output argument.
+ */
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+				   int size)
+{
+	switch (size) {
+	case 1:
+		__asm__ __volatile__("xchgb %b0,%1"
+			: "=q" (x)
+			: "m" (*__xg(ptr)), "0" (x)
+			: "memory");
+		break;
+	case 2:
+		__asm__ __volatile__("xchgw %w0,%1"
+			: "=r" (x)
+			: "m" (*__xg(ptr)), "0" (x)
+			: "memory");
+		break;
+	case 4:
+		__asm__ __volatile__("xchgl %0,%1"
+			: "=r" (x)
+			: "m" (*__xg(ptr)), "0" (x)
+			: "memory");
+		break;
+	}
+
+	return x;
+}
+
+void lapic_write(unsigned long reg, unsigned long v)
+{
+	(void)xchg((volatile unsigned long *)(LAPIC_DEFAULT_BASE + reg), v);
+}
+
+void enable_lapic(void)
+{
+	if (!IS_ENABLED(CONFIG_INTEL_QUARK)) {
+		msr_t msr;
+
+		msr = msr_read(MSR_IA32_APICBASE);
+		msr.hi &= 0xffffff00;
+		msr.lo |= MSR_IA32_APICBASE_ENABLE;
+		msr.lo &= ~MSR_IA32_APICBASE_BASE;
+		msr.lo |= LAPIC_DEFAULT_BASE;
+		msr_write(MSR_IA32_APICBASE, msr);
+	}
+}
+
+void disable_lapic(void)
+{
+	if (!IS_ENABLED(CONFIG_INTEL_QUARK)) {
+		msr_t msr;
+
+		msr = msr_read(MSR_IA32_APICBASE);
+		msr.lo &= ~MSR_IA32_APICBASE_ENABLE;
+		msr_write(MSR_IA32_APICBASE, msr);
+	}
+}
+
+unsigned long lapicid(void)
+{
+	return lapic_read(LAPIC_ID) >> 24;
+}
+
+static void lapic_wait_icr_idle(void)
+{
+	do { } while (lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY);
+}
+
+int lapic_remote_read(int apicid, int reg, unsigned long *pvalue)
+{
+	int timeout;
+	unsigned long status;
+	int result;
+
+	lapic_wait_icr_idle();
+	lapic_write(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
+	lapic_write(LAPIC_ICR, LAPIC_DM_REMRD | (reg >> 4));
+
+	timeout = 0;
+	do {
+		status = lapic_read(LAPIC_ICR) & LAPIC_ICR_RR_MASK;
+	} while (status == LAPIC_ICR_RR_INPROG && timeout++ < 1000);
+
+	result = -1;
+	if (status == LAPIC_ICR_RR_VALID) {
+		*pvalue = lapic_read(LAPIC_RRR);
+		result = 0;
+	}
+
+	return result;
+}
+
+void lapic_setup(void)
+{
+	/* Only Pentium Pro and later have those MSR stuff */
+	debug("Setting up local apic: ");
+
+	/* Enable the local apic */
+	enable_lapic();
+
+	/* Set Task Priority to 'accept all' */
+	lapic_write(LAPIC_TASKPRI,
+		    lapic_read(LAPIC_TASKPRI) & ~LAPIC_TPRI_MASK);
+
+	/* Put the local apic in virtual wire mode */
+	lapic_write(LAPIC_SPIV, (lapic_read(LAPIC_SPIV) &
+		    ~(LAPIC_VECTOR_MASK)) | LAPIC_SPIV_ENABLE);
+	lapic_write(LAPIC_LVT0, (lapic_read(LAPIC_LVT0) &
+		    ~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
+		    LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
+		    LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
+		    LAPIC_DELIVERY_MODE_MASK)) |
+		    (LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
+		    LAPIC_DELIVERY_MODE_EXTINT));
+	lapic_write(LAPIC_LVT1, (lapic_read(LAPIC_LVT1) &
+		    ~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
+		    LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
+		    LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
+		    LAPIC_DELIVERY_MODE_MASK)) |
+		    (LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
+		    LAPIC_DELIVERY_MODE_NMI));
+
+	debug("apic_id: 0x%02lx, ", lapicid());
+
+	debug("done.\n");
+	post_code(POST_LAPIC);
+}