1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
4 #include <asm/x86_init.h>
6 #include <asm/xen/hypercall.h>
9 #include <xen/interface/physdev.h>
14 static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
16 struct physdev_apic apic_op;
19 apic_op.apic_physbase = mpc_ioapic_addr(apic);
21 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
25 /* fallback to return an emulated IO_APIC values */
34 static u32 xen_set_apic_id(unsigned int x)
40 static unsigned int xen_get_apic_id(unsigned long x)
42 return ((x)>>24) & 0xFFu;
45 static u32 xen_apic_read(u32 reg)
47 struct xen_platform_op op = {
48 .cmd = XENPF_get_cpuinfo,
49 .interface_version = XENPF_INTERFACE_VERSION,
50 .u.pcpu_info.xen_cpuid = 0,
54 /* Shouldn't need this as APIC is turned off for PV, and we only
55 * get called on the bootup processor. But just in case. */
56 if (!xen_initial_domain() || smp_processor_id())
63 return SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
68 ret = HYPERVISOR_platform_op(&op);
70 op.u.pcpu_info.apic_id = BAD_APICID;
72 return op.u.pcpu_info.apic_id << 24;
75 static void xen_apic_write(u32 reg, u32 val)
77 if (reg == APIC_LVTPC) {
78 (void)pmu_apic_update(reg);
82 /* Warn to see if there's any stray references */
83 WARN(1,"register: %x, value: %x\n", reg, val);
86 static u64 xen_apic_icr_read(void)
91 static void xen_apic_icr_write(u32 low, u32 id)
93 /* Warn to see if there's any stray references */
97 static u32 xen_safe_apic_wait_icr_idle(void)
102 static int xen_apic_probe_pv(void)
110 static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
112 return xen_pv_domain();
115 static int xen_id_always_valid(u32 apicid)
120 static int xen_id_always_registered(void)
125 static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
127 return initial_apic_id >> index_msb;
131 static int xen_x86_32_early_logical_apicid(int cpu)
133 /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */
138 static void xen_noop(void)
142 static void xen_silent_inquire(int apicid)
146 static int xen_cpu_present_to_apicid(int cpu)
148 if (cpu_present(cpu))
149 return cpu_data(cpu).apicid;
154 static struct apic xen_pv_apic = {
156 .probe = xen_apic_probe_pv,
157 .acpi_madt_oem_check = xen_madt_oem_check,
158 .apic_id_valid = xen_id_always_valid,
159 .apic_id_registered = xen_id_always_registered,
161 /* .irq_delivery_mode - used in native_compose_msi_msg only */
162 /* .irq_dest_mode - used in native_compose_msi_msg only */
165 /* .dest_logical - default_send_IPI_ use it but we use our own. */
166 .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */
168 .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */
170 .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */
171 .setup_apic_routing = NULL,
172 .cpu_present_to_apicid = xen_cpu_present_to_apicid,
173 .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */
174 .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */
175 .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */
177 .get_apic_id = xen_get_apic_id,
178 .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */
180 .calc_dest_apicid = apic_flat_calc_apicid,
183 .send_IPI_mask = xen_send_IPI_mask,
184 .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
185 .send_IPI_allbutself = xen_send_IPI_allbutself,
186 .send_IPI_all = xen_send_IPI_all,
187 .send_IPI_self = xen_send_IPI_self,
189 /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */
190 .inquire_remote_apic = xen_silent_inquire,
192 .read = xen_apic_read,
193 .write = xen_apic_write,
194 .eoi_write = xen_apic_write,
196 .icr_read = xen_apic_icr_read,
197 .icr_write = xen_apic_icr_write,
198 .wait_icr_idle = xen_noop,
199 .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
202 /* generic_processor_info and setup_local_APIC. */
203 .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid,
207 static void __init xen_apic_check(void)
209 if (apic == &xen_pv_apic)
212 pr_info("Switched APIC routing from %s to %s.\n", apic->name,
216 void __init xen_init_apic(void)
218 x86_apic_ops.io_apic_read = xen_io_apic_read;
219 /* On PV guests the APIC CPUID bit is disabled so none of the
220 * routines end up executing. */
221 if (!xen_initial_domain())
224 x86_platform.apic_post_init = xen_apic_check;
226 apic_driver(xen_pv_apic);