pc-bios/s390-ccw/s390-ccw.h

   1 /*
   2  * S390 CCW boot loader
   3  *
   4  * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   7  * your option) any later version. See the COPYING file in the top-level
   8  * directory.
   9  */
  10
  11 #ifndef S390_CCW_H
  12 #define S390_CCW_H
  13
  14 /* #define DEBUG */
  15
  16 typedef unsigned char      u8;
  17 typedef unsigned short     u16;
  18 typedef unsigned int       u32;
  19 typedef unsigned long long u64;
  20 typedef unsigned long      ulong;
  21 typedef unsigned char      __u8;
  22 typedef unsigned short     __u16;
  23 typedef unsigned int       __u32;
  24 typedef unsigned long long __u64;
  25
  26 #define true 1
  27 #define false 0
  28 #define PAGE_SIZE 4096
  29
  30 #ifndef EIO
  31 #define EIO     1
  32 #endif
  33 #ifndef EBUSY
  34 #define EBUSY   2
  35 #endif
  36 #ifndef NULL
  37 #define NULL    0
  38 #endif
  39 #ifndef MIN
  40 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  41 #endif
  42 #ifndef MIN_NON_ZERO
  43 #define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
  44                             ((b) == 0 ? (a) : (MIN(a, b))))
  45 #endif
  46
  47 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
  48
  49 #include "cio.h"
  50 #include "iplb.h"
  51
  52 /* start.s */
  53 void disabled_wait(void);
  54 void consume_sclp_int(void);
  55 void consume_io_int(void);
  56
  57 /* main.c */
  58 void panic(const char *string);
  59 void write_subsystem_identification(void);
  60 extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
  61 unsigned int get_loadparm_index(void);
  62
  63 /* sclp.c */
  64 void sclp_print(const char *string);
  65 void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask);
  66 void sclp_setup(void);
  67 void sclp_get_loadparm_ascii(char *loadparm);
  68 int sclp_read(char *str, size_t count);
  69
  70 /* virtio.c */
  71 unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
  72                                  ulong subchan_id, void *load_addr);
  73 bool virtio_is_supported(SubChannelId schid);
  74 void virtio_blk_setup_device(SubChannelId schid);
  75 int virtio_read(ulong sector, void *load_addr);
  76 u64 get_clock(void);
  77 ulong get_second(void);
  78
  79 /* bootmap.c */
  80 void zipl_load(void);
  81
  82 /* jump2ipl.c */
  83 void jump_to_IPL_code(uint64_t address);
  84 void jump_to_low_kernel(void);
  85
  86 /* menu.c */
  87 void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout);
  88 int menu_get_zipl_boot_index(const char *menu_data);
  89 bool menu_is_enabled_zipl(void);
  90 int menu_get_enum_boot_index(bool *valid_entries);
  91 bool menu_is_enabled_enum(void);
  92
  93 #define MAX_BOOT_ENTRIES  31
  94
  95 static inline void fill_hex(char *out, unsigned char val)
  96 {
  97     const char hex[] = "0123456789abcdef";
  98
  99     out[0] = hex[(val >> 4) & 0xf];
 100     out[1] = hex[val & 0xf];
 101 }
 102
 103 static inline void fill_hex_val(char *out, void *ptr, unsigned size)
 104 {
 105     unsigned char *value = ptr;
 106     unsigned int i;
 107
 108     for (i = 0; i < size; i++) {
 109         fill_hex(&out[i*2], value[i]);
 110     }
 111 }
 112
 113 static inline void print_int(const char *desc, u64 addr)
 114 {
 115     char out[] = ": 0xffffffffffffffff\n";
 116
 117     fill_hex_val(&out[4], &addr, sizeof(addr));
 118
 119     sclp_print(desc);
 120     sclp_print(out);
 121 }
 122
 123 static inline void debug_print_int(const char *desc, u64 addr)
 124 {
 125 #ifdef DEBUG
 126     print_int(desc, addr);
 127 #endif
 128 }
 129
 130 static inline void debug_print_addr(const char *desc, void *p)
 131 {
 132 #ifdef DEBUG
 133     debug_print_int(desc, (unsigned int)(unsigned long)p);
 134 #endif
 135 }
 136
 137 /***********************************************
 138  *           Hypercall functions               *
 139  ***********************************************/
 140
 141 #define KVM_S390_VIRTIO_NOTIFY          0
 142 #define KVM_S390_VIRTIO_RESET           1
 143 #define KVM_S390_VIRTIO_SET_STATUS      2
 144 #define KVM_S390_VIRTIO_CCW_NOTIFY      3
 145
 146 static inline void yield(void)
 147 {
 148     asm volatile ("diag 0,0,0x44"
 149                   : :
 150                   : "memory", "cc");
 151 }
 152
 153 #define MAX_SECTOR_SIZE 4096
 154
 155 static inline void sleep(unsigned int seconds)
 156 {
 157     ulong target = get_second() + seconds;
 158
 159     while (get_second() < target) {
 160         yield();
 161     }
 162 }
 163
 164 static inline void IPL_assert(bool term, const char *message)
 165 {
 166     if (!term) {
 167         sclp_print("\n! ");
 168         sclp_print(message);
 169         panic(" !\n"); /* no return */
 170     }
 171 }
 172
 173 static inline void IPL_check(bool term, const char *message)
 174 {
 175     if (!term) {
 176         sclp_print("\n! WARNING: ");
 177         sclp_print(message);
 178         sclp_print(" !\n");
 179     }
 180 }
 181
 182 extern const unsigned char ebc2asc[256];
 183 static inline void ebcdic_to_ascii(const char *src,
 184                                    char *dst,
 185                                    unsigned int size)
 186 {
 187     unsigned int i;
 188
 189     for (i = 0; i < size; i++) {
 190         unsigned c = src[i];
 191         dst[i] = ebc2asc[c];
 192     }
 193 }
 194
 195 #endif /* S390_CCW_H */