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1#include <linux/init.h>
2
3#include <asm/x86_init.h>
4#include <asm/apic.h>
5#include <asm/xen/hypercall.h>
6
7#include <xen/xen.h>
8#include <xen/interface/physdev.h>
9#include "xen-ops.h"
10
11static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
12{
13 struct physdev_apic apic_op;
14 int ret;
15
16 apic_op.apic_physbase = mpc_ioapic_addr(apic);
17 apic_op.reg = reg;
18 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
19 if (!ret)
20 return apic_op.value;
21
22 /* fallback to return an emulated IO_APIC values */
23 if (reg == 0x1)
24 return 0x00170020;
25 else if (reg == 0x0)
26 return apic << 24;
27
28 return 0xfd;
29}
30
31void __init xen_init_apic(void)
32{
33 x86_io_apic_ops.read = xen_io_apic_read;
34}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/init.h>
3
4#include <asm/x86_init.h>
5#include <asm/apic.h>
6#include <asm/xen/hypercall.h>
7
8#include <xen/xen.h>
9#include <xen/interface/physdev.h>
10#include "xen-ops.h"
11#include "pmu.h"
12#include "smp.h"
13
14static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
15{
16 struct physdev_apic apic_op;
17 int ret;
18
19 apic_op.apic_physbase = mpc_ioapic_addr(apic);
20 apic_op.reg = reg;
21 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
22 if (!ret)
23 return apic_op.value;
24
25 /* fallback to return an emulated IO_APIC values */
26 if (reg == 0x1)
27 return 0x00170020;
28 else if (reg == 0x0)
29 return apic << 24;
30
31 return 0xfd;
32}
33
34static u32 xen_set_apic_id(unsigned int x)
35{
36 WARN_ON(1);
37 return x;
38}
39
40static unsigned int xen_get_apic_id(unsigned long x)
41{
42 return ((x)>>24) & 0xFFu;
43}
44
45static u32 xen_apic_read(u32 reg)
46{
47 struct xen_platform_op op = {
48 .cmd = XENPF_get_cpuinfo,
49 .interface_version = XENPF_INTERFACE_VERSION,
50 .u.pcpu_info.xen_cpuid = 0,
51 };
52 int ret = 0;
53
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())
57 return 0;
58
59 if (reg == APIC_LVR)
60 return 0x14;
61#ifdef CONFIG_X86_32
62 if (reg == APIC_LDR)
63 return SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
64#endif
65 if (reg != APIC_ID)
66 return 0;
67
68 ret = HYPERVISOR_platform_op(&op);
69 if (ret)
70 op.u.pcpu_info.apic_id = BAD_APICID;
71
72 return op.u.pcpu_info.apic_id << 24;
73}
74
75static void xen_apic_write(u32 reg, u32 val)
76{
77 if (reg == APIC_LVTPC) {
78 (void)pmu_apic_update(reg);
79 return;
80 }
81
82 /* Warn to see if there's any stray references */
83 WARN(1,"register: %x, value: %x\n", reg, val);
84}
85
86static u64 xen_apic_icr_read(void)
87{
88 return 0;
89}
90
91static void xen_apic_icr_write(u32 low, u32 id)
92{
93 /* Warn to see if there's any stray references */
94 WARN_ON(1);
95}
96
97static u32 xen_safe_apic_wait_icr_idle(void)
98{
99 return 0;
100}
101
102static int xen_apic_probe_pv(void)
103{
104 if (xen_pv_domain())
105 return 1;
106
107 return 0;
108}
109
110static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
111{
112 return xen_pv_domain();
113}
114
115static int xen_id_always_valid(u32 apicid)
116{
117 return 1;
118}
119
120static int xen_id_always_registered(void)
121{
122 return 1;
123}
124
125static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
126{
127 return initial_apic_id >> index_msb;
128}
129
130#ifdef CONFIG_X86_32
131static int xen_x86_32_early_logical_apicid(int cpu)
132{
133 /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */
134 return 1 << cpu;
135}
136#endif
137
138static void xen_noop(void)
139{
140}
141
142static void xen_silent_inquire(int apicid)
143{
144}
145
146static int xen_cpu_present_to_apicid(int cpu)
147{
148 if (cpu_present(cpu))
149 return cpu_data(cpu).apicid;
150 else
151 return BAD_APICID;
152}
153
154static struct apic xen_pv_apic = {
155 .name = "Xen PV",
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,
160
161 /* .irq_delivery_mode - used in native_compose_msi_msg only */
162 /* .irq_dest_mode - used in native_compose_msi_msg only */
163
164 .disable_esr = 0,
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 */
167
168 .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */
169
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 */
176
177 .get_apic_id = xen_get_apic_id,
178 .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */
179
180 .calc_dest_apicid = apic_flat_calc_apicid,
181
182#ifdef CONFIG_SMP
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,
188#endif
189 /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */
190 .inquire_remote_apic = xen_silent_inquire,
191
192 .read = xen_apic_read,
193 .write = xen_apic_write,
194 .eoi_write = xen_apic_write,
195
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,
200
201#ifdef CONFIG_X86_32
202 /* generic_processor_info and setup_local_APIC. */
203 .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid,
204#endif
205};
206
207static void __init xen_apic_check(void)
208{
209 if (apic == &xen_pv_apic)
210 return;
211
212 pr_info("Switched APIC routing from %s to %s.\n", apic->name,
213 xen_pv_apic.name);
214 apic = &xen_pv_apic;
215}
216void __init xen_init_apic(void)
217{
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())
222 apic = &xen_pv_apic;
223
224 x86_platform.apic_post_init = xen_apic_check;
225}
226apic_driver(xen_pv_apic);