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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
10unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
11{
12 struct physdev_apic apic_op;
13 int ret;
14
15 apic_op.apic_physbase = mpc_ioapic_addr(apic);
16 apic_op.reg = reg;
17 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
18 if (!ret)
19 return apic_op.value;
20
21 /* fallback to return an emulated IO_APIC values */
22 if (reg == 0x1)
23 return 0x00170020;
24 else if (reg == 0x0)
25 return apic << 24;
26
27 return 0xfd;
28}
29
30void __init xen_init_apic(void)
31{
32 x86_io_apic_ops.read = xen_io_apic_read;
33}
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#include "pmu.h"
11#include "smp.h"
12
13static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
14{
15 struct physdev_apic apic_op;
16 int ret;
17
18 apic_op.apic_physbase = mpc_ioapic_addr(apic);
19 apic_op.reg = reg;
20 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
21 if (!ret)
22 return apic_op.value;
23
24 /* fallback to return an emulated IO_APIC values */
25 if (reg == 0x1)
26 return 0x00170020;
27 else if (reg == 0x0)
28 return apic << 24;
29
30 return 0xfd;
31}
32
33static unsigned long xen_set_apic_id(unsigned int x)
34{
35 WARN_ON(1);
36 return x;
37}
38
39static unsigned int xen_get_apic_id(unsigned long x)
40{
41 return ((x)>>24) & 0xFFu;
42}
43
44static u32 xen_apic_read(u32 reg)
45{
46 struct xen_platform_op op = {
47 .cmd = XENPF_get_cpuinfo,
48 .interface_version = XENPF_INTERFACE_VERSION,
49 .u.pcpu_info.xen_cpuid = 0,
50 };
51 int ret = 0;
52
53 /* Shouldn't need this as APIC is turned off for PV, and we only
54 * get called on the bootup processor. But just in case. */
55 if (!xen_initial_domain() || smp_processor_id())
56 return 0;
57
58 if (reg == APIC_LVR)
59 return 0x10;
60#ifdef CONFIG_X86_32
61 if (reg == APIC_LDR)
62 return SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
63#endif
64 if (reg != APIC_ID)
65 return 0;
66
67 ret = HYPERVISOR_platform_op(&op);
68 if (ret)
69 op.u.pcpu_info.apic_id = BAD_APICID;
70
71 return op.u.pcpu_info.apic_id << 24;
72}
73
74static void xen_apic_write(u32 reg, u32 val)
75{
76 if (reg == APIC_LVTPC) {
77 (void)pmu_apic_update(reg);
78 return;
79 }
80
81 /* Warn to see if there's any stray references */
82 WARN(1,"register: %x, value: %x\n", reg, val);
83}
84
85static u64 xen_apic_icr_read(void)
86{
87 return 0;
88}
89
90static void xen_apic_icr_write(u32 low, u32 id)
91{
92 /* Warn to see if there's any stray references */
93 WARN_ON(1);
94}
95
96static u32 xen_safe_apic_wait_icr_idle(void)
97{
98 return 0;
99}
100
101static int xen_apic_probe_pv(void)
102{
103 if (xen_pv_domain())
104 return 1;
105
106 return 0;
107}
108
109static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
110{
111 return xen_pv_domain();
112}
113
114static int xen_id_always_valid(int apicid)
115{
116 return 1;
117}
118
119static int xen_id_always_registered(void)
120{
121 return 1;
122}
123
124static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
125{
126 return initial_apic_id >> index_msb;
127}
128
129#ifdef CONFIG_X86_32
130static int xen_x86_32_early_logical_apicid(int cpu)
131{
132 /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */
133 return 1 << cpu;
134}
135#endif
136
137static void xen_noop(void)
138{
139}
140
141static void xen_silent_inquire(int apicid)
142{
143}
144
145static int xen_cpu_present_to_apicid(int cpu)
146{
147 if (cpu_present(cpu))
148 return xen_get_apic_id(xen_apic_read(APIC_ID));
149 else
150 return BAD_APICID;
151}
152
153static struct apic xen_pv_apic = {
154 .name = "Xen PV",
155 .probe = xen_apic_probe_pv,
156 .acpi_madt_oem_check = xen_madt_oem_check,
157 .apic_id_valid = xen_id_always_valid,
158 .apic_id_registered = xen_id_always_registered,
159
160 /* .irq_delivery_mode - used in native_compose_msi_msg only */
161 /* .irq_dest_mode - used in native_compose_msi_msg only */
162
163 .target_cpus = default_target_cpus,
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 .vector_allocation_domain = flat_vector_allocation_domain,
169 .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */
170
171 .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */
172 .setup_apic_routing = NULL,
173 .cpu_present_to_apicid = xen_cpu_present_to_apicid,
174 .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */
175 .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */
176 .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */
177
178 .get_apic_id = xen_get_apic_id,
179 .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */
180 .apic_id_mask = 0xFF << 24, /* Used by verify_local_APIC. Match with what xen_get_apic_id does. */
181
182 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
183
184#ifdef CONFIG_SMP
185 .send_IPI_mask = xen_send_IPI_mask,
186 .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
187 .send_IPI_allbutself = xen_send_IPI_allbutself,
188 .send_IPI_all = xen_send_IPI_all,
189 .send_IPI_self = xen_send_IPI_self,
190#endif
191 /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */
192 .inquire_remote_apic = xen_silent_inquire,
193
194 .read = xen_apic_read,
195 .write = xen_apic_write,
196 .eoi_write = xen_apic_write,
197
198 .icr_read = xen_apic_icr_read,
199 .icr_write = xen_apic_icr_write,
200 .wait_icr_idle = xen_noop,
201 .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
202
203#ifdef CONFIG_X86_32
204 /* generic_processor_info and setup_local_APIC. */
205 .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid,
206#endif
207};
208
209static void __init xen_apic_check(void)
210{
211 if (apic == &xen_pv_apic)
212 return;
213
214 pr_info("Switched APIC routing from %s to %s.\n", apic->name,
215 xen_pv_apic.name);
216 apic = &xen_pv_apic;
217}
218void __init xen_init_apic(void)
219{
220 x86_io_apic_ops.read = xen_io_apic_read;
221 /* On PV guests the APIC CPUID bit is disabled so none of the
222 * routines end up executing. */
223 if (!xen_initial_domain())
224 apic = &xen_pv_apic;
225
226 x86_platform.apic_post_init = xen_apic_check;
227}
228apic_driver(xen_pv_apic);