1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/thread_info.h>
5 #include <asm/x86_init.h>
7 #include <asm/io_apic.h>
8 #include <asm/xen/hypercall.h>
11 #include <xen/interface/physdev.h>
16 static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
18 struct physdev_apic apic_op;
21 apic_op.apic_physbase = mpc_ioapic_addr(apic);
23 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
27 /* fallback to return an emulated IO_APIC values */
36 static u32 xen_set_apic_id(u32 x)
42 static u32 xen_get_apic_id(u32 x)
44 return ((x)>>24) & 0xFFu;
47 static u32 xen_apic_read(u32 reg)
49 struct xen_platform_op op = {
50 .cmd = XENPF_get_cpuinfo,
51 .interface_version = XENPF_INTERFACE_VERSION,
52 .u.pcpu_info.xen_cpuid = 0,
56 /* Shouldn't need this as APIC is turned off for PV, and we only
57 * get called on the bootup processor. But just in case. */
58 if (!xen_initial_domain() || smp_processor_id())
66 ret = HYPERVISOR_platform_op(&op);
68 op.u.pcpu_info.apic_id = BAD_APICID;
70 return op.u.pcpu_info.apic_id << 24;
73 static void xen_apic_write(u32 reg, u32 val)
75 if (reg == APIC_LVTPC) {
76 (void)pmu_apic_update(reg);
80 /* Warn to see if there's any stray references */
81 WARN(1,"register: %x, value: %x\n", reg, val);
84 static void xen_apic_eoi(void)
89 static u64 xen_apic_icr_read(void)
94 static void xen_apic_icr_write(u32 low, u32 id)
96 /* Warn to see if there's any stray references */
100 static int xen_apic_probe_pv(void)
108 static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
110 return xen_pv_domain();
113 static u32 xen_phys_pkg_id(u32 initial_apic_id, int index_msb)
115 return initial_apic_id >> index_msb;
118 static u32 xen_cpu_present_to_apicid(int cpu)
120 if (cpu_present(cpu))
121 return cpu_data(cpu).topo.apicid;
126 static struct apic xen_pv_apic __ro_after_init = {
128 .probe = xen_apic_probe_pv,
129 .acpi_madt_oem_check = xen_madt_oem_check,
131 /* .delivery_mode and .dest_mode_logical not used by XENPV */
135 .cpu_present_to_apicid = xen_cpu_present_to_apicid,
136 .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */
138 .max_apic_id = UINT_MAX,
139 .get_apic_id = xen_get_apic_id,
140 .set_apic_id = xen_set_apic_id,
142 .calc_dest_apicid = apic_flat_calc_apicid,
145 .send_IPI_mask = xen_send_IPI_mask,
146 .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
147 .send_IPI_allbutself = xen_send_IPI_allbutself,
148 .send_IPI_all = xen_send_IPI_all,
149 .send_IPI_self = xen_send_IPI_self,
151 .read = xen_apic_read,
152 .write = xen_apic_write,
155 .icr_read = xen_apic_icr_read,
156 .icr_write = xen_apic_icr_write,
158 apic_driver(xen_pv_apic);
160 void __init xen_init_apic(void)
162 x86_apic_ops.io_apic_read = xen_io_apic_read;