diff options
Diffstat (limited to 'arch/x86_64/kernel/genapic_flat.c')
-rw-r--r-- | arch/x86_64/kernel/genapic_flat.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c new file mode 100644 index 000000000000..b4cbbad04226 --- /dev/null +++ b/arch/x86_64/kernel/genapic_flat.c | |||
@@ -0,0 +1,127 @@ | |||
1 | /* | ||
2 | * Copyright 2004 James Cleverdon, IBM. | ||
3 | * Subject to the GNU Public License, v.2 | ||
4 | * | ||
5 | * Flat APIC subarch code. Maximum 8 CPUs, logical delivery. | ||
6 | * | ||
7 | * Hacked for x86-64 by James Cleverdon from i386 architecture code by | ||
8 | * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and | ||
9 | * James Cleverdon. | ||
10 | */ | ||
11 | #include <linux/config.h> | ||
12 | #include <linux/threads.h> | ||
13 | #include <linux/cpumask.h> | ||
14 | #include <linux/string.h> | ||
15 | #include <linux/kernel.h> | ||
16 | #include <linux/ctype.h> | ||
17 | #include <linux/init.h> | ||
18 | #include <asm/smp.h> | ||
19 | #include <asm/ipi.h> | ||
20 | |||
21 | |||
22 | static cpumask_t flat_target_cpus(void) | ||
23 | { | ||
24 | return cpu_online_map; | ||
25 | } | ||
26 | |||
27 | /* | ||
28 | * Set up the logical destination ID. | ||
29 | * | ||
30 | * Intel recommends to set DFR, LDR and TPR before enabling | ||
31 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | ||
32 | * document number 292116). So here it goes... | ||
33 | */ | ||
34 | static void flat_init_apic_ldr(void) | ||
35 | { | ||
36 | unsigned long val; | ||
37 | unsigned long num, id; | ||
38 | |||
39 | num = smp_processor_id(); | ||
40 | id = 1UL << num; | ||
41 | x86_cpu_to_log_apicid[num] = id; | ||
42 | apic_write_around(APIC_DFR, APIC_DFR_FLAT); | ||
43 | val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; | ||
44 | val |= SET_APIC_LOGICAL_ID(id); | ||
45 | apic_write_around(APIC_LDR, val); | ||
46 | } | ||
47 | |||
48 | static void flat_send_IPI_allbutself(int vector) | ||
49 | { | ||
50 | /* | ||
51 | * if there are no other CPUs in the system then | ||
52 | * we get an APIC send error if we try to broadcast. | ||
53 | * thus we have to avoid sending IPIs in this case. | ||
54 | */ | ||
55 | if (num_online_cpus() > 1) | ||
56 | __send_IPI_shortcut(APIC_DEST_ALLBUT, vector, APIC_DEST_LOGICAL); | ||
57 | } | ||
58 | |||
59 | static void flat_send_IPI_all(int vector) | ||
60 | { | ||
61 | __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL); | ||
62 | } | ||
63 | |||
64 | static void flat_send_IPI_mask(cpumask_t cpumask, int vector) | ||
65 | { | ||
66 | unsigned long mask = cpus_addr(cpumask)[0]; | ||
67 | unsigned long cfg; | ||
68 | unsigned long flags; | ||
69 | |||
70 | local_save_flags(flags); | ||
71 | local_irq_disable(); | ||
72 | |||
73 | /* | ||
74 | * Wait for idle. | ||
75 | */ | ||
76 | apic_wait_icr_idle(); | ||
77 | |||
78 | /* | ||
79 | * prepare target chip field | ||
80 | */ | ||
81 | cfg = __prepare_ICR2(mask); | ||
82 | apic_write_around(APIC_ICR2, cfg); | ||
83 | |||
84 | /* | ||
85 | * program the ICR | ||
86 | */ | ||
87 | cfg = __prepare_ICR(0, vector, APIC_DEST_LOGICAL); | ||
88 | |||
89 | /* | ||
90 | * Send the IPI. The write to APIC_ICR fires this off. | ||
91 | */ | ||
92 | apic_write_around(APIC_ICR, cfg); | ||
93 | local_irq_restore(flags); | ||
94 | } | ||
95 | |||
96 | static int flat_apic_id_registered(void) | ||
97 | { | ||
98 | return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map); | ||
99 | } | ||
100 | |||
101 | static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask) | ||
102 | { | ||
103 | return cpus_addr(cpumask)[0] & APIC_ALL_CPUS; | ||
104 | } | ||
105 | |||
106 | static unsigned int phys_pkg_id(int index_msb) | ||
107 | { | ||
108 | u32 ebx; | ||
109 | |||
110 | ebx = cpuid_ebx(1); | ||
111 | return ((ebx >> 24) & 0xFF) >> index_msb; | ||
112 | } | ||
113 | |||
114 | struct genapic apic_flat = { | ||
115 | .name = "flat", | ||
116 | .int_delivery_mode = dest_LowestPrio, | ||
117 | .int_dest_mode = (APIC_DEST_LOGICAL != 0), | ||
118 | .int_delivery_dest = APIC_DEST_LOGICAL | APIC_DM_LOWEST, | ||
119 | .target_cpus = flat_target_cpus, | ||
120 | .apic_id_registered = flat_apic_id_registered, | ||
121 | .init_apic_ldr = flat_init_apic_ldr, | ||
122 | .send_IPI_all = flat_send_IPI_all, | ||
123 | .send_IPI_allbutself = flat_send_IPI_allbutself, | ||
124 | .send_IPI_mask = flat_send_IPI_mask, | ||
125 | .cpu_mask_to_apicid = flat_cpu_mask_to_apicid, | ||
126 | .phys_pkg_id = phys_pkg_id, | ||
127 | }; | ||