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Annotation of qemu/roms/qemu-palcode/crb.c, revision 1.1

1.1     ! root        1: /* Console Callback Routines.
        !             2: 
        !             3:    Copyright (C) 2011 Richard Henderson
        !             4: 
        !             5:    This file is part of QEMU PALcode.
        !             6: 
        !             7:    This program is free software; you can redistribute it and/or modify
        !             8:    it under the terms of the GNU General Public License as published by
        !             9:    the Free Software Foundation; either version 2 of the License or
        !            10:    (at your option) any later version.
        !            11: 
        !            12:    This program is distributed in the hope that it will be useful,
        !            13:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the text
        !            15:    of the GNU General Public License for more details.
        !            16: 
        !            17:    You should have received a copy of the GNU General Public License
        !            18:    along with this program; see the file COPYING.  If not see
        !            19:    <http://www.gnu.org/licenses/>.  */
        !            20: 
        !            21: #include "hwrpb.h"
        !            22: #include "protos.h"
        !            23: #include "console.h"
        !            24: #include "uart.h"
        !            25: 
        !            26: 
        !            27: /* All routines use the high bit to signal error.  */
        !            28: #define ERR    0x8000000000000000ul
        !            29: 
        !            30: 
        !            31: unsigned long
        !            32: crb_getc(long unit)
        !            33: {
        !            34:   /* Multiple consoles not yet supported.  */
        !            35:   if (unit != 0)
        !            36:     return ERR;
        !            37: 
        !            38:   return uart_getchar(COM1);
        !            39: }
        !            40: 
        !            41: unsigned long
        !            42: crb_process_keycode(long unit, long keycode, long again)
        !            43: {
        !            44:   /* This routine might be needed for real keyboards, and mostly for
        !            45:      internationalization stuff.  */
        !            46:   /* Return Failure: routine not supported.  */
        !            47:   return 0xc000000000000000ul;
        !            48: }
        !            49: 
        !            50: unsigned long
        !            51: crb_puts(long unit, const char *buf, unsigned long length)
        !            52: {
        !            53:   unsigned int orig_length = length;
        !            54: 
        !            55:   /* Multiple consoles not yet supported.  */
        !            56:   if (unit != 0)
        !            57:     return ERR;
        !            58: 
        !            59:   for (; length != 0; --length, ++buf)
        !            60:     uart_putchar_raw(COM1, (unsigned char)*buf);
        !            61: 
        !            62:   /* Bits <31:0> of the return value are the number of bytes written.
        !            63:      To me that implies that the input value must be 32-bit, but v2
        !            64:      of the ARM doesn't explicitly say.  */
        !            65:   return orig_length;
        !            66: }
        !            67: 
        !            68: unsigned long
        !            69: crb_reset_term(long unit)
        !            70: {
        !            71:   /* Multiple consoles not yet supported.  */
        !            72:   if (unit != 0)
        !            73:     return ERR;
        !            74: 
        !            75:   uart_init_line(COM1, 9600);
        !            76:   return 0;
        !            77: }
        !            78: 
        !            79: static unsigned long
        !            80: crb_set_term_ctl(long unit, long ctb)
        !            81: {
        !            82:   /* ??? The contents of the CTB do not seem to be defined anywhere.
        !            83:      How, therefore, can the user set new contents?  */
        !            84:   return ERR;
        !            85: }
        !            86: 
        !            87: static unsigned long
        !            88: crb_set_term_int(long unit, long mask)
        !            89: {
        !            90:   /* We do no buffering, therefore we don't need to support interrupts.  */
        !            91:   if (unit != 0 || (mask & 0x22) != 0)
        !            92:     return ERR;
        !            93:   return 0;
        !            94: }
        !            95: 
        !            96: unsigned long
        !            97: crb_open(const char *devstr,  unsigned long length)
        !            98: {
        !            99:   /* FIXME */
        !           100:   return ERR;
        !           101: }
        !           102: 
        !           103: unsigned long
        !           104: crb_close(long channel)
        !           105: {
        !           106:   /* FIXME */
        !           107:   return 0;
        !           108: }
        !           109: 
        !           110: static unsigned long
        !           111: crb_ioctl(long channel)
        !           112: {
        !           113:   /* We do not, nor will not, support virtual tapes.  */
        !           114:   return ERR;
        !           115: }
        !           116: 
        !           117: unsigned long
        !           118: crb_read(long channel, unsigned long length, char *buf, unsigned long block)
        !           119: {
        !           120:   /* FIXME */
        !           121:   return ERR;
        !           122: }
        !           123: 
        !           124: unsigned long
        !           125: crb_write(long channel, unsigned long length, const char *buf,
        !           126:           unsigned long block)
        !           127: {
        !           128:   /* FIXME */
        !           129:   return ERR;
        !           130: }
        !           131: 
        !           132: unsigned long
        !           133: crb_get_env(unsigned long id, char *buf, unsigned long length)
        !           134: {
        !           135:   /* FIXME */
        !           136:   return 0xc000000000000000ul;
        !           137: }
        !           138: 
        !           139: unsigned long
        !           140: crb_set_env(unsigned long id, const char *buf, unsigned long length)
        !           141: {
        !           142:   /* FIXME */
        !           143:   return 0xc000000000000000ul;
        !           144: }
        !           145: 
        !           146: static unsigned long
        !           147: crb_reset_env(unsigned long id, char *buf, unsigned long length)
        !           148: {
        !           149:   /* FIXME */
        !           150:   return 0xc000000000000000ul;
        !           151: }
        !           152: 
        !           153: static unsigned long
        !           154: crb_save_env(void)
        !           155: {
        !           156:   /* FIXME */
        !           157:   return 0xc000000000000000ul;
        !           158: }
        !           159: 
        !           160: static unsigned long
        !           161: crb_pswitch(long action, long cpu_id)
        !           162: {
        !           163:   /* Why would we ever need to support switching primary processor?  */
        !           164:   return ERR;
        !           165: }
        !           166: 
        !           167: static unsigned long __attribute__((used))
        !           168: int_crb_dispatch(long select, long a1, long a2, long a3, long a4)
        !           169: {
        !           170:   switch (select)
        !           171:     {
        !           172:     case CRB_GETC:
        !           173:       return crb_getc(a1);
        !           174:     case CRB_PUTS:
        !           175:       return crb_puts(a1, (const char *)a2, a3);
        !           176:     case CRB_RESET_TERM:
        !           177:       return crb_reset_term(a1);
        !           178:     case CRB_SET_TERM_INT:
        !           179:       return crb_set_term_int(a1, a2);
        !           180:     case CRB_SET_TERM_CTL:
        !           181:       return crb_set_term_ctl(a1, a2);
        !           182:     case CRB_PROCESS_KEYCODE:
        !           183:       return crb_process_keycode(a1, a2, a3);
        !           184: 
        !           185:     case CRB_OPEN:
        !           186:       return crb_open((const char*)a1, a2);
        !           187:     case CRB_CLOSE:
        !           188:       return crb_close(a1);
        !           189:     case CRB_IOCTL:
        !           190:       return crb_ioctl(a1);
        !           191:     case CRB_READ:
        !           192:       return crb_read(a1, a2, (char *)a3, a4);
        !           193:     case CRB_WRITE:
        !           194:       return crb_write(a1, a2, (const char *)a3, a4);
        !           195: 
        !           196:     case CRB_SET_ENV:
        !           197:       return crb_set_env(a1, (const char *)a2, a3);
        !           198:     case CRB_RESET_ENV:
        !           199:       return crb_reset_env(a1, (char *)a2, a3);
        !           200:     case CRB_GET_ENV:
        !           201:       return crb_get_env(a1, (char *)a2, a3);
        !           202:     case CRB_SAVE_ENV:
        !           203:       return crb_save_env();
        !           204: 
        !           205:     case CRB_PSWITCH:
        !           206:       return crb_pswitch(a1, a2);
        !           207:     }
        !           208:   return ERR;
        !           209: }
        !           210: 
        !           211: static unsigned long __attribute__((used))
        !           212: int_crb_fixup(unsigned long vptptr, unsigned long hwrpb)
        !           213: {
        !           214:   /* Given that this console is written to use the KSEG, and not be
        !           215:      mapped into any page-table address space, it doesn't seem like
        !           216:      we need to do anything at all here.  */
        !           217:   return 0;
        !           218: }
        !           219: 
        !           220: /* The CRB DISPATCH and FIXUP functions are defined to use the VMS
        !           221:    calling convention.  This has several effects: 
        !           222:      (1) The set of call-saved registers is different.
        !           223:      (2) $27 contains the procdesc_struct, not the called function.
        !           224:    Map between the two calling conventions here.  */
        !           225: 
        !           226: asm(".macro    VMStoUNIX name\n"
        !           227: "      .globl  \\name\n"
        !           228: "      .ent    \\name\n"
        !           229: "\\name:\n"
        !           230: "      .frame  $sp, 64, $26, 0\n"
        !           231: "      subq    $sp, 64, $sp\n"
        !           232: "      stq     $26, 0($sp)\n"
        !           233: "      stq     $2, 8($sp)\n"
        !           234: "      stq     $3, 16($sp)\n"
        !           235: "      stq     $4, 24($sp)\n"
        !           236: "      stq     $5, 32($sp)\n"
        !           237: "      stq     $6, 40($sp)\n"
        !           238: "      stq     $7, 48($sp)\n"
        !           239: "      stq     $8, 56($sp)\n"
        !           240: "      .mask   0x40001fc, 0\n"
        !           241: "      .prologue 2\n"
        !           242: "      br      $gp, .+4\n"
        !           243: "      ldgp    $gp, 0($gp)\n"
        !           244: "      bsr     $26, int_\\name !samegp\n"
        !           245: "      ldq     $26, 0($sp)\n"
        !           246: "      ldq     $2, 8($sp)\n"
        !           247: "      ldq     $3, 16($sp)\n"
        !           248: "      ldq     $4, 24($sp)\n"
        !           249: "      ldq     $5, 32($sp)\n"
        !           250: "      ldq     $6, 40($sp)\n"
        !           251: "      ldq     $7, 48($sp)\n"
        !           252: "      ldq     $8, 56($sp)\n"
        !           253: "      addq    $sp, 64, $sp\n"
        !           254: "      ret\n"
        !           255: "      .end    \\name\n"
        !           256: ".endm\n"
        !           257: "      VMStoUNIX       crb_dispatch\n"
        !           258: "      VMStoUNIX       crb_fixup\n"
        !           259: );

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