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-rw-r--r--sys/arch/amd64/lapic.c292
1 files changed, 0 insertions, 292 deletions
diff --git a/sys/arch/amd64/lapic.c b/sys/arch/amd64/lapic.c
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--- a/sys/arch/amd64/lapic.c
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-/*
- * Copyright (c) 2023 Ian Marco Moffett and the Osmora Team.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of Hyra nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <machine/lapic.h>
-#include <machine/lapicvar.h>
-#include <machine/cpuid.h>
-#include <machine/msr.h>
-#include <machine/cpu.h>
-#include <sys/cdefs.h>
-#include <sys/timer.h>
-#include <sys/syslog.h>
-#include <sys/panic.h>
-#include <sys/mmio.h>
-#include <dev/timer/hpet.h>
-
-__MODULE_NAME("lapic");
-__KERNEL_META("$Hyra$: lapic.c, Ian Marco Moffett, "
- "Local APIC driver");
-
-/*
- * Only calls KINFO if we are the BSP.
- */
-#define BSP_KINFO(...) do { \
- uint64_t msr_val; \
- \
- msr_val = rdmsr(IA32_APIC_BASE_MSR); \
- if (__TEST(msr_val, 1 << 8)) { \
- KINFO(__VA_ARGS__); \
- } \
- } while (0);
-
-static void *lapic_base = NULL;
-static struct timer lapic_timer = { 0 };
-static bool has_x2apic = false;
-
-/*
- * Returns true if LAPIC is supported.
- *
- * LAPIC is supported if CPUID.(EAX=1H):EDX[9] == 1
- */
-static inline bool
-lapic_check_support(void)
-{
- uint32_t eax, edx, tmp;
-
- __CPUID(0x00000001, eax, tmp, tmp, edx);
- return __TEST(edx, 1 << 9);
-}
-
-/*
- * Reads a 32 bit value from Local APIC
- * register space.
- *
- * @reg: Register to read from.
- */
-static inline uint32_t
-lapic_readl(uint32_t reg)
-{
- void *addr;
-
- if (!has_x2apic) {
- addr = (void *)((uintptr_t)lapic_base + reg);
- return mmio_read32(addr);
- } else {
- reg >>= 4;
- return rdmsr(x2APIC_MSR_BASE + reg);
- }
-}
-
-/*
- * Writes a 32 bit value to Local APIC
- * register space.
- *
- * @reg: Register to write to.
- */
-static inline void
-lapic_writel(uint32_t reg, uint32_t val)
-{
- void *addr;
-
- if (!has_x2apic) {
- addr = (void *)((uintptr_t)lapic_base + reg);
- mmio_write32(addr, val);
- } else {
- reg >>= 4;
- wrmsr(x2APIC_MSR_BASE + reg, val);
- }
-}
-
-/*
- * Calibrates the Local APIC timer - Timer abstraction
- */
-static size_t
-lapic_timer_calibrate(void)
-{
- size_t freq;
-
- lapic_timer_init(&freq);
- return freq;
-}
-
-/*
- * Stops the Local APIC timer - Timer abstraction
- */
-static void
-lapic_timer_stop(void)
-{
- lapic_writel(LAPIC_INIT_CNT, 0);
- lapic_writel(LAPIC_LVT_TMR, LAPIC_LVT_MASK);
-}
-
-/*
- * Set bits within a LAPIC register
- * without overwriting the whole thing.
- *
- * @reg: Reg with bits to be set.
- * @value: Value in reg will be ORd with this.
- */
-static inline void
-lapic_reg_set(uint32_t reg, uint32_t value)
-{
- uint32_t old;
-
- old = lapic_readl(reg);
- lapic_writel(reg, old | value);
-}
-
-/*
- * Clear bits within a LAPIC register
- * without overwriting the whole thing.
- *
- * @reg: Reg with bits to be cleared.
- * @value: Value in reg will be cleared by this value.
- */
-static inline void
-lapic_reg_clear(uint32_t reg, uint32_t value)
-{
- uint32_t old;
-
- old = lapic_readl(reg);
- lapic_writel(reg, old & ~(value));
-}
-
-/*
- * Reads the Local APIC ID of the
- * current processor.
- */
-static inline uint32_t
-lapic_get_id(void)
-{
- if (!has_x2apic) {
- return (lapic_readl(LAPIC_ID) >> 24) & 0xF;
- } else {
- return lapic_readl(LAPIC_ID);
- }
-}
-
-/*
- * Checks if the processor supports x2APIC
- * mode. Returns true if so.
- */
-static inline bool
-lapic_has_x2apic(void)
-{
- uint32_t ecx, tmp;
-
- __CPUID(0x00000001, tmp, tmp, ecx, tmp);
- return __TEST(ecx, 1 << 21);
-}
-
-/*
- * Updates LDR to LAPIC_STARTUP_LID.
- *
- * XXX: This does *not* happen with x2APIC
- * as the LDR register in x2APIC mode
- * is readonly.
- */
-static inline void
-lapic_set_ldr(void)
-{
- if (!has_x2apic)
- lapic_writel(LAPIC_LDR, LAPIC_STARTUP_LID);
-}
-
-void
-lapic_timer_init(size_t *freq_out)
-{
- uint32_t ticks_per_10ms;
- const uint32_t MAX_SAMPLES = 0xFFFFFFFF;
-
- lapic_writel(LAPIC_DCR, 3); /* Use divider 16 */
- lapic_writel(LAPIC_INIT_CNT, MAX_SAMPLES); /* Set the initial count */
-
- hpet_msleep(10); /* Wait 10ms (10000 usec) */
- lapic_writel(LAPIC_LVT_TMR, LAPIC_LVT_MASK); /* Stop the timer w/ LVT mask bit */
-
- /* Sanity check */
- if (freq_out == NULL)
- panic("lapic_timer_init() freq_out NULL\n");
-
- ticks_per_10ms = MAX_SAMPLES - lapic_readl(LAPIC_CUR_CNT);
- *freq_out = ticks_per_10ms;
-}
-
-void
-lapic_set_base(void *mmio_base)
-{
- if (lapic_base == NULL)
- lapic_base = mmio_base;
-}
-
-void
-lapic_init(void)
-{
- struct cpu_info *cur_cpu;
- uint64_t tmp;
- size_t tmr_freq;
-
- /* Sanity check */
- if (lapic_base == NULL) {
- panic("LAPIC base not set!\n");
- }
-
- if (!lapic_check_support()) {
- /*
- * Hyra currently depends on the existance
- * of a Local APIC.
- */
- panic("This machine does not support LAPIC!\n");
- }
-
- has_x2apic = lapic_has_x2apic();
-
- /* Hardware enable the Local APIC */
- tmp = rdmsr(IA32_APIC_BASE_MSR);
- tmp |= has_x2apic << x2APIC_ENABLE_SHIFT;
- wrmsr(IA32_APIC_BASE_MSR, tmp | LAPIC_HW_ENABLE);
-
- /* Software enable the Local APIC via SVR */
- lapic_reg_set(LAPIC_SVR, LAPIC_SW_ENABLE);
-
- BSP_KINFO("Enabled Local APIC for BSP\n");
- lapic_set_ldr();
-
- /* Setup the timer descriptor */
- lapic_timer.name = "LAPIC_INTEGRATED_TIMER";
- lapic_timer.calibrate = lapic_timer_calibrate;
- lapic_timer.stop = lapic_timer_stop;
-
- /* Register the timer for scheduler usage */
- register_timer(TIMER_SCHED, &lapic_timer);
-
- /* Get the current processor, and lock its structure */
- cur_cpu = this_cpu();
- CPU_INFO_LOCK(cur_cpu);
-
- /* Calibrate timer */
- lapic_timer_init(&tmr_freq);
- cur_cpu->lapic_tmr_freq = tmr_freq;
-
- /* Set the Local APIC ID */
- cur_cpu->id = lapic_get_id();
-
- BSP_KINFO("BSP Local APIC ID: %d\n", cur_cpu->id);
- CPU_INFO_UNLOCK(cur_cpu);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 17:36:58 +0000