arch/powerpc/kernel/paca.c

   1 /*
   2  * c 2001 PPC 64 Team, IBM Corp
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License
   6  *      as published by the Free Software Foundation; either version
   7  *      2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/threads.h>
  12 #include <linux/module.h>
  13
  14 #include <asm/processor.h>
  15 #include <asm/ptrace.h>
  16 #include <asm/page.h>
  17 #include <asm/lppaca.h>
  18 #include <asm/iseries/it_lp_reg_save.h>
  19 #include <asm/paca.h>
  20 #include <asm/mmu.h>
  21
  22
  23 /* This symbol is provided by the linker - let it fill in the paca
  24  * field correctly */
  25 extern unsigned long __toc_start;
  26
  27 /*
  28  * iSeries structure which the hypervisor knows about - this structure
  29  * should not cross a page boundary.  The vpa_init/register_vpa call
  30  * is now known to fail if the lppaca structure crosses a page
  31  * boundary.  The lppaca is also used on POWER5 pSeries boxes.  The
  32  * lppaca is 640 bytes long, and cannot readily change since the
  33  * hypervisor knows its layout, so a 1kB alignment will suffice to
  34  * ensure that it doesn't cross a page boundary.
  35  */
  36 struct lppaca lppaca[] = {
  37         [0 ... (NR_CPUS-1)] = {
  38                 .desc = 0xd397d781,     /* "LpPa" */
  39                 .size = sizeof(struct lppaca),
  40                 .dyn_proc_status = 2,
  41                 .decr_val = 0x00ff0000,
  42                 .fpregs_in_use = 1,
  43                 .end_of_quantum = 0xfffffffffffffffful,
  44                 .slb_count = 64,
  45                 .vmxregs_in_use = 0,
  46         },
  47 };
  48
  49 /*
  50  * 3 persistent SLBs are registered here.  The buffer will be zero
  51  * initially, hence will all be invaild until we actually write them.
  52  */
  53 struct slb_shadow slb_shadow[] __cacheline_aligned = {
  54         [0 ... (NR_CPUS-1)] = {
  55                 .persistent = SLB_NUM_BOLTED,
  56                 .buffer_length = sizeof(struct slb_shadow),
  57         },
  58 };
  59
  60 /* The Paca is an array with one entry per processor.  Each contains an
  61  * lppaca, which contains the information shared between the
  62  * hypervisor and Linux.
  63  * On systems with hardware multi-threading, there are two threads
  64  * per processor.  The Paca array must contain an entry for each thread.
  65  * The VPD Areas will give a max logical processors = 2 * max physical
  66  * processors.  The processor VPD array needs one entry per physical
  67  * processor (not thread).
  68  */
  69 #define PACA_INIT_COMMON(number)                                            \
  70         .lppaca_ptr = &lppaca[number],                                      \
  71         .lock_token = 0x8000,                                               \
  72         .paca_index = (number),         /* Paca Index */                    \
  73         .kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL,             \
  74         .hw_cpu_id = 0xffff,                                                \
  75         .slb_shadow_ptr = &slb_shadow[number],
  76
  77 #ifdef CONFIG_PPC_ISERIES
  78 #define PACA_INIT_ISERIES(number)                                           \
  79         .reg_save_ptr = &iseries_reg_save[number],
  80
  81 #define PACA_INIT(number)                                                   \
  82 {                                                                           \
  83         PACA_INIT_COMMON(number)                                            \
  84         PACA_INIT_ISERIES(number)                                           \
  85 }
  86
  87 #else
  88 #define PACA_INIT(number)                                                   \
  89 {                                                                           \
  90         PACA_INIT_COMMON(number)                                            \
  91 }
  92
  93 #endif
  94
  95 struct paca_struct paca[] = {
  96         PACA_INIT(0),
  97 #if NR_CPUS > 1
  98         PACA_INIT(  1), PACA_INIT(  2), PACA_INIT(  3),
  99 #if NR_CPUS > 4
 100         PACA_INIT(  4), PACA_INIT(  5), PACA_INIT(  6), PACA_INIT(  7),
 101 #if NR_CPUS > 8
 102         PACA_INIT(  8), PACA_INIT(  9), PACA_INIT( 10), PACA_INIT( 11),
 103         PACA_INIT( 12), PACA_INIT( 13), PACA_INIT( 14), PACA_INIT( 15),
 104         PACA_INIT( 16), PACA_INIT( 17), PACA_INIT( 18), PACA_INIT( 19),
 105         PACA_INIT( 20), PACA_INIT( 21), PACA_INIT( 22), PACA_INIT( 23),
 106         PACA_INIT( 24), PACA_INIT( 25), PACA_INIT( 26), PACA_INIT( 27),
 107         PACA_INIT( 28), PACA_INIT( 29), PACA_INIT( 30), PACA_INIT( 31),
 108 #if NR_CPUS > 32
 109         PACA_INIT( 32), PACA_INIT( 33), PACA_INIT( 34), PACA_INIT( 35),
 110         PACA_INIT( 36), PACA_INIT( 37), PACA_INIT( 38), PACA_INIT( 39),
 111         PACA_INIT( 40), PACA_INIT( 41), PACA_INIT( 42), PACA_INIT( 43),
 112         PACA_INIT( 44), PACA_INIT( 45), PACA_INIT( 46), PACA_INIT( 47),
 113         PACA_INIT( 48), PACA_INIT( 49), PACA_INIT( 50), PACA_INIT( 51),
 114         PACA_INIT( 52), PACA_INIT( 53), PACA_INIT( 54), PACA_INIT( 55),
 115         PACA_INIT( 56), PACA_INIT( 57), PACA_INIT( 58), PACA_INIT( 59),
 116         PACA_INIT( 60), PACA_INIT( 61), PACA_INIT( 62), PACA_INIT( 63),
 117 #if NR_CPUS > 64
 118         PACA_INIT( 64), PACA_INIT( 65), PACA_INIT( 66), PACA_INIT( 67),
 119         PACA_INIT( 68), PACA_INIT( 69), PACA_INIT( 70), PACA_INIT( 71),
 120         PACA_INIT( 72), PACA_INIT( 73), PACA_INIT( 74), PACA_INIT( 75),
 121         PACA_INIT( 76), PACA_INIT( 77), PACA_INIT( 78), PACA_INIT( 79),
 122         PACA_INIT( 80), PACA_INIT( 81), PACA_INIT( 82), PACA_INIT( 83),
 123         PACA_INIT( 84), PACA_INIT( 85), PACA_INIT( 86), PACA_INIT( 87),
 124         PACA_INIT( 88), PACA_INIT( 89), PACA_INIT( 90), PACA_INIT( 91),
 125         PACA_INIT( 92), PACA_INIT( 93), PACA_INIT( 94), PACA_INIT( 95),
 126         PACA_INIT( 96), PACA_INIT( 97), PACA_INIT( 98), PACA_INIT( 99),
 127         PACA_INIT(100), PACA_INIT(101), PACA_INIT(102), PACA_INIT(103),
 128         PACA_INIT(104), PACA_INIT(105), PACA_INIT(106), PACA_INIT(107),
 129         PACA_INIT(108), PACA_INIT(109), PACA_INIT(110), PACA_INIT(111),
 130         PACA_INIT(112), PACA_INIT(113), PACA_INIT(114), PACA_INIT(115),
 131         PACA_INIT(116), PACA_INIT(117), PACA_INIT(118), PACA_INIT(119),
 132         PACA_INIT(120), PACA_INIT(121), PACA_INIT(122), PACA_INIT(123),
 133         PACA_INIT(124), PACA_INIT(125), PACA_INIT(126), PACA_INIT(127),
 134 #endif
 135 #endif
 136 #endif
 137 #endif
 138 #endif
 139 };
 140 EXPORT_SYMBOL(paca);