apic.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2021, Google LLC.
 */

#ifndef SELFTEST_KVM_APIC_H
#define SELFTEST_KVM_APIC_H

#include <stdint.h>

#include "processor.h"
#include "ucall_common.h"

#define APIC_DEFAULT_GPA		0xfee00000ULL

/* APIC base address MSR and fields */
#define MSR_IA32_APICBASE		0x0000001b
#define MSR_IA32_APICBASE_BSP		(1<<8)
#define MSR_IA32_APICBASE_EXTD		(1<<10)
#define MSR_IA32_APICBASE_ENABLE	(1<<11)
#define MSR_IA32_APICBASE_BASE		(0xfffff<<12)
#define		GET_APIC_BASE(x)	(((x) >> 12) << 12)

#define APIC_BASE_MSR	0x800
#define X2APIC_ENABLE	(1UL << 10)
#define	APIC_ID		0x20
#define	APIC_LVR	0x30
#define		GET_APIC_ID_FIELD(x)	(((x) >> 24) & 0xFF)
#define	APIC_TASKPRI	0x80
#define	APIC_PROCPRI	0xA0
#define	APIC_EOI	0xB0
#define	APIC_SPIV	0xF0
#define		APIC_SPIV_FOCUS_DISABLED	(1 << 9)
#define		APIC_SPIV_APIC_ENABLED		(1 << 8)
#define APIC_IRR	0x200
#define	APIC_ICR	0x300
#define	APIC_LVTCMCI	0x2f0
#define		APIC_DEST_SELF		0x40000
#define		APIC_DEST_ALLINC	0x80000
#define		APIC_DEST_ALLBUT	0xC0000
#define		APIC_ICR_RR_MASK	0x30000
#define		APIC_ICR_RR_INVALID	0x00000
#define		APIC_ICR_RR_INPROG	0x10000
#define		APIC_ICR_RR_VALID	0x20000
#define		APIC_INT_LEVELTRIG	0x08000
#define		APIC_INT_ASSERT		0x04000
#define		APIC_ICR_BUSY		0x01000
#define		APIC_DEST_LOGICAL	0x00800
#define		APIC_DEST_PHYSICAL	0x00000
#define		APIC_DM_FIXED		0x00000
#define		APIC_DM_FIXED_MASK	0x00700
#define		APIC_DM_LOWEST		0x00100
#define		APIC_DM_SMI		0x00200
#define		APIC_DM_REMRD		0x00300
#define		APIC_DM_NMI		0x00400
#define		APIC_DM_INIT		0x00500
#define		APIC_DM_STARTUP		0x00600
#define		APIC_DM_EXTINT		0x00700
#define		APIC_VECTOR_MASK	0x000FF
#define	APIC_ICR2	0x310
#define		SET_APIC_DEST_FIELD(x)	((x) << 24)
#define APIC_LVTT	0x320
#define		APIC_LVT_TIMER_ONESHOT		(0 << 17)
#define		APIC_LVT_TIMER_PERIODIC		(1 << 17)
#define		APIC_LVT_TIMER_TSCDEADLINE	(2 << 17)
#define		APIC_LVT_MASKED			(1 << 16)
#define	APIC_TMICT	0x380
#define	APIC_TMCCT	0x390
#define	APIC_TDCR	0x3E0

void apic_disable(void);
void xapic_enable(void);
void x2apic_enable(void);

static inline uint32_t get_bsp_flag(void)
{
	return rdmsr(MSR_IA32_APICBASE) & MSR_IA32_APICBASE_BSP;
}

static inline uint32_t xapic_read_reg(unsigned int reg)
{
	return ((volatile uint32_t *)APIC_DEFAULT_GPA)[reg >> 2];
}

static inline void xapic_write_reg(unsigned int reg, uint32_t val)
{
	((volatile uint32_t *)APIC_DEFAULT_GPA)[reg >> 2] = val;
}

static inline uint64_t x2apic_read_reg(unsigned int reg)
{
	return rdmsr(APIC_BASE_MSR + (reg >> 4));
}

static inline uint8_t x2apic_write_reg_safe(unsigned int reg, uint64_t value)
{
	return wrmsr_safe(APIC_BASE_MSR + (reg >> 4), value);
}

static inline void x2apic_write_reg(unsigned int reg, uint64_t value)
{
	uint8_t fault = x2apic_write_reg_safe(reg, value);

	__GUEST_ASSERT(!fault, "Unexpected fault 0x%x on WRMSR(%x) = %lx\n",
		       fault, APIC_BASE_MSR + (reg >> 4), value);
}

static inline void x2apic_write_reg_fault(unsigned int reg, uint64_t value)
{
	uint8_t fault = x2apic_write_reg_safe(reg, value);

	__GUEST_ASSERT(fault == GP_VECTOR,
		       "Wanted #GP on WRMSR(%x) = %lx, got 0x%x\n",
		       APIC_BASE_MSR + (reg >> 4), value, fault);
}


#endif /* SELFTEST_KVM_APIC_H */