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 #include <asm/psci.h>
  30 #include <asm/spinlock.h>
  31 #include <asm/sysregs.h>
  32
  33 struct pending_irq;
  34
  35 struct per_cpu {
  36         /* Keep these two in sync with defines above! */
  37         u8 stack[PAGE_SIZE];
  38         unsigned long linux_sp;
  39         unsigned long linux_ret;
  40         unsigned long linux_flags;
  41         unsigned long linux_reg[NUM_ENTRY_REGS];
  42
  43         unsigned int cpu_id;
  44         unsigned int virt_id;
  45
  46         /* Other CPUs can insert sgis into the pending array */
  47         spinlock_t gic_lock;
  48         struct pending_irq *pending_irqs;
  49         struct pending_irq *first_pending;
  50         /* Only GICv3: redistributor base */
  51         void *gicr_base;
  52
  53         struct cell *cell;
  54
  55         u32 stats[JAILHOUSE_NUM_CPU_STATS];
  56
  57         bool initialized;
  58
  59         /* The mbox will be accessed with a ldrd, which requires alignment */
  60         __attribute__((aligned(8))) struct psci_mbox psci_mbox;
  61         struct psci_mbox guest_mbox;
  62
  63         bool flush_vcpu_caches;
  64         int shutdown_state;
  65         bool failed;
  66 } __attribute__((aligned(PAGE_SIZE)));
  67
  68 static inline struct per_cpu *this_cpu_data(void)
  69 {
  70         struct per_cpu *cpu_data;
  71
  72         arm_read_sysreg(TPIDR_EL2, cpu_data);
  73         return cpu_data;
  74 }
  75
  76 #define DEFINE_PER_CPU_ACCESSOR(field)                                  \
  77 static inline typeof(((struct per_cpu *)0)->field) this_##field(void)   \
  78 {                                                                       \
  79         return this_cpu_data()->field;                                  \
  80 }
  81
  82 DEFINE_PER_CPU_ACCESSOR(cpu_id)
  83 DEFINE_PER_CPU_ACCESSOR(cell)
  84
  85 static inline struct per_cpu *per_cpu(unsigned int cpu)
  86 {
  87         extern u8 __page_pool[];
  88
  89         return (struct per_cpu *)(__page_pool + (cpu << PERCPU_SIZE_SHIFT));
  90 }
  91
  92 static inline struct registers *guest_regs(struct per_cpu *cpu_data)
  93 {
  94         /* Assumes that the trap handler is entered with an empty stack */
  95         return (struct registers *)(cpu_data->stack + PERCPU_STACK_END
  96                         - sizeof(struct registers));
  97 }
  98
  99 static inline unsigned int arm_cpu_phys2virt(unsigned int cpu_id)
 100 {
 101         return per_cpu(cpu_id)->virt_id;
 102 }
 103
 104 unsigned int arm_cpu_virt2phys(struct cell *cell, unsigned int virt_id);
 105
 106 /* Validate defines */
 107 #define CHECK_ASSUMPTION(assume)        ((void)sizeof(char[1 - 2*!(assume)]))
 108
 109 static inline void __check_assumptions(void)
 110 {
 111         struct per_cpu cpu_data;
 112
 113         CHECK_ASSUMPTION(sizeof(struct per_cpu) == (1 << PERCPU_SIZE_SHIFT));
 114         CHECK_ASSUMPTION(sizeof(cpu_data.stack) == PERCPU_STACK_END);
 115         CHECK_ASSUMPTION(__builtin_offsetof(struct per_cpu, linux_sp) ==
 116                          PERCPU_LINUX_SP);
 117 }
 118 #endif /* !__ASSEMBLY__ */
 119
 120 #endif /* !_JAILHOUSE_ASM_PERCPU_H */