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// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/thread_info.h>
#include <asm/x86_init.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include "xen-ops.h"
#include "pmu.h"
#include "smp.h"
static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
{
struct physdev_apic apic_op;
int ret;
apic_op.apic_physbase = mpc_ioapic_addr(apic);
apic_op.reg = reg;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
if (!ret)
return apic_op.value;
/* fallback to return an emulated IO_APIC values */
if (reg == 0x1)
return 0x00170020;
else if (reg == 0x0)
return apic << 24;
return 0xfd;
}
static u32 xen_get_apic_id(u32 x)
{
return ((x)>>24) & 0xFFu;
}
static u32 xen_apic_read(u32 reg)
{
struct xen_platform_op op = {
.cmd = XENPF_get_cpuinfo,
.interface_version = XENPF_INTERFACE_VERSION,
};
int ret, cpu;
if (reg == APIC_LVR)
return 0x14;
if (reg != APIC_ID)
return 0;
cpu = smp_processor_id();
if (!xen_initial_domain())
return cpu ? cpuid_to_apicid[cpu] << 24 : 0;
op.u.pcpu_info.xen_cpuid = cpu;
ret = HYPERVISOR_platform_op(&op);
if (ret)
op.u.pcpu_info.apic_id = BAD_APICID;
return op.u.pcpu_info.apic_id << 24;
}
static void xen_apic_write(u32 reg, u32 val)
{
if (reg == APIC_LVTPC) {
(void)pmu_apic_update(reg);
return;
}
/* Warn to see if there's any stray references */
WARN(1,"register: %x, value: %x\n", reg, val);
}
static void xen_apic_eoi(void)
{
WARN_ON_ONCE(1);
}
static u64 xen_apic_icr_read(void)
{
return 0;
}
static void xen_apic_icr_write(u32 low, u32 id)
{
/* Warn to see if there's any stray references */
WARN_ON(1);
}
static int xen_apic_probe_pv(void)
{
if (xen_pv_domain())
return 1;
return 0;
}
static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
{
return xen_pv_domain();
}
static u32 xen_cpu_present_to_apicid(int cpu)
{
if (cpu_present(cpu))
return cpu_data(cpu).topo.apicid;
else
return BAD_APICID;
}
static struct apic xen_pv_apic __ro_after_init = {
.name = "Xen PV",
.probe = xen_apic_probe_pv,
.acpi_madt_oem_check = xen_madt_oem_check,
/* .delivery_mode and .dest_mode_logical not used by XENPV */
.disable_esr = 0,
.cpu_present_to_apicid = xen_cpu_present_to_apicid,
.max_apic_id = UINT_MAX,
.get_apic_id = xen_get_apic_id,
.calc_dest_apicid = apic_flat_calc_apicid,
#ifdef CONFIG_SMP
.send_IPI_mask = xen_send_IPI_mask,
.send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
.send_IPI_allbutself = xen_send_IPI_allbutself,
.send_IPI_all = xen_send_IPI_all,
.send_IPI_self = xen_send_IPI_self,
#endif
.read = xen_apic_read,
.write = xen_apic_write,
.eoi = xen_apic_eoi,
.icr_read = xen_apic_icr_read,
.icr_write = xen_apic_icr_write,
};
apic_driver(xen_pv_apic);
void __init xen_init_apic(void)
{
x86_apic_ops.io_apic_read = xen_io_apic_read;
}
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