hw/hpet_emul.h

   1 /*
   2  * QEMU Emulated HPET support
   3  *
   4  * Copyright IBM, Corp. 2008
   5  *
   6  * Authors:
   7  *  Beth Kon   <bkon@us.ibm.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 QEMU_HPET_EMUL_H
  14 #define QEMU_HPET_EMUL_H
  15
  16 #define HPET_BASE               0xfed00000
  17 #define HPET_CLK_PERIOD         10000000ULL /* 10000000 femtoseconds == 10ns*/
  18
  19 #define FS_PER_NS 1000000
  20 #define HPET_NUM_TIMERS 3
  21 #define HPET_TIMER_TYPE_LEVEL 0x002
  22
  23 #define HPET_CFG_ENABLE 0x001
  24 #define HPET_CFG_LEGACY 0x002
  25
  26 #define HPET_ID         0x000
  27 #define HPET_PERIOD     0x004
  28 #define HPET_CFG        0x010
  29 #define HPET_STATUS     0x020
  30 #define HPET_COUNTER    0x0f0
  31 #define HPET_TN_CFG     0x000
  32 #define HPET_TN_CMP     0x008
  33 #define HPET_TN_ROUTE   0x010
  34 #define HPET_CFG_WRITE_MASK  0x3
  35
  36
  37 #define HPET_TN_ENABLE           0x004
  38 #define HPET_TN_PERIODIC         0x008
  39 #define HPET_TN_PERIODIC_CAP     0x010
  40 #define HPET_TN_SIZE_CAP         0x020
  41 #define HPET_TN_SETVAL           0x040
  42 #define HPET_TN_32BIT            0x100
  43 #define HPET_TN_INT_ROUTE_MASK  0x3e00
  44 #define HPET_TN_CFG_WRITE_MASK  0x3f4e
  45 #define HPET_TN_INT_ROUTE_SHIFT      9
  46 #define HPET_TN_INT_ROUTE_CAP_SHIFT 32
  47 #define HPET_TN_CFG_BITS_READONLY_OR_RESERVED 0xffff80b1U
  48
  49 struct HPETState;
  50 typedef struct HPETTimer {  /* timers */
  51     uint8_t tn;             /*timer number*/
  52     QEMUTimer *qemu_timer;
  53     struct HPETState *state;
  54     /* Memory-mapped, software visible timer registers */
  55     uint64_t config;        /* configuration/cap */
  56     uint64_t cmp;           /* comparator */
  57     uint64_t fsb;           /* FSB route, not supported now */
  58     /* Hidden register state */
  59     uint64_t period;        /* Last value written to comparator */
  60     uint8_t wrap_flag;      /* timer pop will indicate wrap for one-shot 32-bit
  61                              * mode. Next pop will be actual timer expiration.
  62                              */
  63 } HPETTimer;
  64
  65 typedef struct HPETState {
  66     uint64_t hpet_offset;
  67     qemu_irq *irqs;
  68     HPETTimer timer[HPET_NUM_TIMERS];
  69
  70     /* Memory-mapped, software visible registers */
  71     uint64_t capability;        /* capabilities */
  72     uint64_t config;            /* configuration */
  73     uint64_t isr;               /* interrupt status reg */
  74     uint64_t hpet_counter;      /* main counter */
  75 } HPETState;
  76
  77 #if defined TARGET_I386
  78 extern uint32_t hpet_in_legacy_mode(void);
  79 extern void hpet_init(qemu_irq *irq);
  80 #endif
  81
  82 #endif