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