diff options
Diffstat (limited to 'qemu/roms/qemu-palcode/crb.c')
-rw-r--r-- | qemu/roms/qemu-palcode/crb.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/qemu/roms/qemu-palcode/crb.c b/qemu/roms/qemu-palcode/crb.c new file mode 100644 index 000000000..c79d4b2ac --- /dev/null +++ b/qemu/roms/qemu-palcode/crb.c @@ -0,0 +1,259 @@ +/* Console Callback Routines. + + Copyright (C) 2011 Richard Henderson + + This file is part of QEMU PALcode. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the text + of the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not see + <http://www.gnu.org/licenses/>. */ + +#include "hwrpb.h" +#include "protos.h" +#include "console.h" +#include "uart.h" + + +/* All routines use the high bit to signal error. */ +#define ERR 0x8000000000000000ul + + +unsigned long +crb_getc(long unit) +{ + /* Multiple consoles not yet supported. */ + if (unit != 0) + return ERR; + + return uart_getchar(COM1); +} + +unsigned long +crb_process_keycode(long unit, long keycode, long again) +{ + /* This routine might be needed for real keyboards, and mostly for + internationalization stuff. */ + /* Return Failure: routine not supported. */ + return 0xc000000000000000ul; +} + +unsigned long +crb_puts(long unit, const char *buf, unsigned long length) +{ + unsigned int orig_length = length; + + /* Multiple consoles not yet supported. */ + if (unit != 0) + return ERR; + + for (; length != 0; --length, ++buf) + uart_putchar_raw(COM1, (unsigned char)*buf); + + /* Bits <31:0> of the return value are the number of bytes written. + To me that implies that the input value must be 32-bit, but v2 + of the ARM doesn't explicitly say. */ + return orig_length; +} + +unsigned long +crb_reset_term(long unit) +{ + /* Multiple consoles not yet supported. */ + if (unit != 0) + return ERR; + + uart_init_line(COM1, 9600); + return 0; +} + +static unsigned long +crb_set_term_ctl(long unit, long ctb) +{ + /* ??? The contents of the CTB do not seem to be defined anywhere. + How, therefore, can the user set new contents? */ + return ERR; +} + +static unsigned long +crb_set_term_int(long unit, long mask) +{ + /* We do no buffering, therefore we don't need to support interrupts. */ + if (unit != 0 || (mask & 0x22) != 0) + return ERR; + return 0; +} + +unsigned long +crb_open(const char *devstr, unsigned long length) +{ + /* FIXME */ + return ERR; +} + +unsigned long +crb_close(long channel) +{ + /* FIXME */ + return 0; +} + +static unsigned long +crb_ioctl(long channel) +{ + /* We do not, nor will not, support virtual tapes. */ + return ERR; +} + +unsigned long +crb_read(long channel, unsigned long length, char *buf, unsigned long block) +{ + /* FIXME */ + return ERR; +} + +unsigned long +crb_write(long channel, unsigned long length, const char *buf, + unsigned long block) +{ + /* FIXME */ + return ERR; +} + +unsigned long +crb_get_env(unsigned long id, char *buf, unsigned long length) +{ + /* FIXME */ + return 0xc000000000000000ul; +} + +unsigned long +crb_set_env(unsigned long id, const char *buf, unsigned long length) +{ + /* FIXME */ + return 0xc000000000000000ul; +} + +static unsigned long +crb_reset_env(unsigned long id, char *buf, unsigned long length) +{ + /* FIXME */ + return 0xc000000000000000ul; +} + +static unsigned long +crb_save_env(void) +{ + /* FIXME */ + return 0xc000000000000000ul; +} + +static unsigned long +crb_pswitch(long action, long cpu_id) +{ + /* Why would we ever need to support switching primary processor? */ + return ERR; +} + +static unsigned long __attribute__((used)) +int_crb_dispatch(long select, long a1, long a2, long a3, long a4) +{ + switch (select) + { + case CRB_GETC: + return crb_getc(a1); + case CRB_PUTS: + return crb_puts(a1, (const char *)a2, a3); + case CRB_RESET_TERM: + return crb_reset_term(a1); + case CRB_SET_TERM_INT: + return crb_set_term_int(a1, a2); + case CRB_SET_TERM_CTL: + return crb_set_term_ctl(a1, a2); + case CRB_PROCESS_KEYCODE: + return crb_process_keycode(a1, a2, a3); + + case CRB_OPEN: + return crb_open((const char*)a1, a2); + case CRB_CLOSE: + return crb_close(a1); + case CRB_IOCTL: + return crb_ioctl(a1); + case CRB_READ: + return crb_read(a1, a2, (char *)a3, a4); + case CRB_WRITE: + return crb_write(a1, a2, (const char *)a3, a4); + + case CRB_SET_ENV: + return crb_set_env(a1, (const char *)a2, a3); + case CRB_RESET_ENV: + return crb_reset_env(a1, (char *)a2, a3); + case CRB_GET_ENV: + return crb_get_env(a1, (char *)a2, a3); + case CRB_SAVE_ENV: + return crb_save_env(); + + case CRB_PSWITCH: + return crb_pswitch(a1, a2); + } + return ERR; +} + +static unsigned long __attribute__((used)) +int_crb_fixup(unsigned long vptptr, unsigned long hwrpb) +{ + /* Given that this console is written to use the KSEG, and not be + mapped into any page-table address space, it doesn't seem like + we need to do anything at all here. */ + return 0; +} + +/* The CRB DISPATCH and FIXUP functions are defined to use the VMS + calling convention. This has several effects: + (1) The set of call-saved registers is different. + (2) $27 contains the procdesc_struct, not the called function. + Map between the two calling conventions here. */ + +asm(".macro VMStoUNIX name\n" +" .globl \\name\n" +" .ent \\name\n" +"\\name:\n" +" .frame $sp, 64, $26, 0\n" +" subq $sp, 64, $sp\n" +" stq $26, 0($sp)\n" +" stq $2, 8($sp)\n" +" stq $3, 16($sp)\n" +" stq $4, 24($sp)\n" +" stq $5, 32($sp)\n" +" stq $6, 40($sp)\n" +" stq $7, 48($sp)\n" +" stq $8, 56($sp)\n" +" .mask 0x40001fc, 0\n" +" .prologue 2\n" +" br $gp, .+4\n" +" ldgp $gp, 0($gp)\n" +" bsr $26, int_\\name !samegp\n" +" ldq $26, 0($sp)\n" +" ldq $2, 8($sp)\n" +" ldq $3, 16($sp)\n" +" ldq $4, 24($sp)\n" +" ldq $5, 32($sp)\n" +" ldq $6, 40($sp)\n" +" ldq $7, 48($sp)\n" +" ldq $8, 56($sp)\n" +" addq $sp, 64, $sp\n" +" ret\n" +" .end \\name\n" +".endm\n" +" VMStoUNIX crb_dispatch\n" +" VMStoUNIX crb_fixup\n" +); |