hypervisor/arch/arm/include/asm/percpu.h

   1 /*
   2  * Jailhouse, a Linux-based partitioning hypervisor
   3  *
   4  * Copyright (c) Siemens AG, 2013
   5  *
   6  * Authors:
   7  *  Jan Kiszka <jan.kiszka@siemens.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12
  13 #ifndef _JAILHOUSE_ASM_PERCPU_H
  14 #define _JAILHOUSE_ASM_PERCPU_H
  15
  16 #include <jailhouse/types.h>
  17 #include <asm/paging.h>
  18
  19 #define NUM_ENTRY_REGS                  13
  20
  21 /* Keep in sync with struct per_cpu! */
  22 #define PERCPU_SIZE_SHIFT               13
  23 #define PERCPU_STACK_END                PAGE_SIZE
  24 #define PERCPU_LINUX_SP                 PERCPU_STACK_END
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #include <asm/cell.h>
  29
  30 struct per_cpu {
  31         /* Keep these two in sync with defines above! */
  32         u8 stack[PAGE_SIZE];
  33         unsigned long linux_sp;
  34         unsigned long linux_ret;
  35         unsigned long linux_flags;
  36         unsigned long linux_reg[NUM_ENTRY_REGS];
  37
  38         struct per_cpu *cpu_data;
  39         unsigned int cpu_id;
  40 //      u32 apic_id;
  41         struct cell *cell;
  42
  43         u32 stats[JAILHOUSE_NUM_CPU_STATS];
  44
  45         bool initialized;
  46
  47         bool flush_caches;
  48         bool shutdown_cpu;
  49         int shutdown_state;
  50         bool failed;
  51 } __attribute__((aligned(PAGE_SIZE)));
  52
  53 #define DEFINE_PER_CPU_ACCESSOR(field)                                      \
  54 static inline typeof(((struct per_cpu *)0)->field) this_##field(void)       \
  55 {                                                                           \
  56         typeof(((struct per_cpu *)0)->field) tmp = 0;                       \
  57                                                                             \
  58         return tmp;                                                         \
  59 }
  60
  61 DEFINE_PER_CPU_ACCESSOR(cpu_data)
  62 DEFINE_PER_CPU_ACCESSOR(cpu_id)
  63 DEFINE_PER_CPU_ACCESSOR(cell)
  64
  65 static inline struct per_cpu *per_cpu(unsigned int cpu)
  66 {
  67         extern u8 __page_pool[];
  68
  69         return (struct per_cpu *)(__page_pool + (cpu << PERCPU_SIZE_SHIFT));
  70 }
  71
  72 /* Validate defines */
  73 #define CHECK_ASSUMPTION(assume)        ((void)sizeof(char[1 - 2*!(assume)]))
  74
  75 static inline void __check_assumptions(void)
  76 {
  77         struct per_cpu cpu_data;
  78
  79         CHECK_ASSUMPTION(sizeof(struct per_cpu) == (1 << PERCPU_SIZE_SHIFT));
  80         CHECK_ASSUMPTION(sizeof(cpu_data.stack) == PERCPU_STACK_END);
  81         CHECK_ASSUMPTION(__builtin_offsetof(struct per_cpu, linux_sp) ==
  82                          PERCPU_LINUX_SP);
  83 }
  84 #endif /* !__ASSEMBLY__ */
  85
  86 #endif /* !_JAILHOUSE_ASM_PERCPU_H */