| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | }; |