244eae91a9
Recent tightening of the opcode table in binutils so as to consistently
disallow the assembly or disassembly of CP0 instructions not supported
by the processor architecture chosen has caused a regression like below:
arch/mips/dec/prom/locore.S: Assembler messages:
arch/mips/dec/prom/locore.S:29: Error: opcode not supported on this processor: r4600 (mips3) `rfe'
in a piece of code used to probe for memory with PMAX DECstation models,
which have non-REX firmware. Those computers always have an R2000 CPU
and consequently the exception handler used in memory probing uses the
RFE instruction, which those processors use.
While adding 64-bit support this code was correctly excluded for 64-bit
configurations, however it should have also been excluded for irrelevant
32-bit configurations. Do this now then, and only enable PMAX memory
probing for R3k systems.
Reported-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org # v2.6.12+
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
166 lines
5.1 KiB
C
166 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* include/asm-mips/dec/prom.h
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*
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* DECstation PROM interface.
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*
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* Copyright (C) 2002 Maciej W. Rozycki
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*
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* Based on arch/mips/dec/prom/prom.h by the Anonymous.
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*/
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#ifndef _ASM_DEC_PROM_H
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#define _ASM_DEC_PROM_H
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#include <linux/types.h>
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#include <asm/addrspace.h>
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/*
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* PMAX/3MAX PROM entry points for DS2100/3100's and DS5000/2xx's.
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* Many of these will work for MIPSen as well!
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*/
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#define VEC_RESET (u64 *)CKSEG1ADDR(0x1fc00000)
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/* Prom base address */
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#define PMAX_PROM_ENTRY(x) (VEC_RESET + (x)) /* Prom jump table */
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#define PMAX_PROM_HALT PMAX_PROM_ENTRY(2) /* valid on MIPSen */
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#define PMAX_PROM_AUTOBOOT PMAX_PROM_ENTRY(5) /* valid on MIPSen */
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#define PMAX_PROM_OPEN PMAX_PROM_ENTRY(6)
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#define PMAX_PROM_READ PMAX_PROM_ENTRY(7)
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#define PMAX_PROM_CLOSE PMAX_PROM_ENTRY(10)
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#define PMAX_PROM_LSEEK PMAX_PROM_ENTRY(11)
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#define PMAX_PROM_GETCHAR PMAX_PROM_ENTRY(12)
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#define PMAX_PROM_PUTCHAR PMAX_PROM_ENTRY(13) /* 12 on MIPSen */
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#define PMAX_PROM_GETS PMAX_PROM_ENTRY(15)
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#define PMAX_PROM_PRINTF PMAX_PROM_ENTRY(17)
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#define PMAX_PROM_GETENV PMAX_PROM_ENTRY(33) /* valid on MIPSen */
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/*
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* Magic number indicating REX PROM available on DECstation. Found in
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* register a2 on transfer of control to program from PROM.
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*/
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#define REX_PROM_MAGIC 0x30464354
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/* KN04 and KN05 are REX PROMs, so only do the check for R3k systems. */
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static inline bool prom_is_rex(u32 magic)
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{
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return !IS_ENABLED(CONFIG_CPU_R3000) || magic == REX_PROM_MAGIC;
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}
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/*
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* 3MIN/MAXINE PROM entry points for DS5000/1xx's, DS5000/xx's and
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* DS5000/2x0.
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*/
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#define REX_PROM_GETBITMAP 0x84/4 /* get mem bitmap */
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#define REX_PROM_GETCHAR 0x24/4 /* getch() */
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#define REX_PROM_GETENV 0x64/4 /* get env. variable */
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#define REX_PROM_GETSYSID 0x80/4 /* get system id */
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#define REX_PROM_GETTCINFO 0xa4/4
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#define REX_PROM_PRINTF 0x30/4 /* printf() */
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#define REX_PROM_SLOTADDR 0x6c/4 /* slotaddr */
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#define REX_PROM_BOOTINIT 0x54/4 /* open() */
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#define REX_PROM_BOOTREAD 0x58/4 /* read() */
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#define REX_PROM_CLEARCACHE 0x7c/4
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/*
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* Used by rex_getbitmap().
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*/
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typedef struct {
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int pagesize;
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unsigned char bitmap[0];
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} memmap;
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/*
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* Function pointers as read from a PROM's callback vector.
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*/
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extern int (*__rex_bootinit)(void);
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extern int (*__rex_bootread)(void);
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extern int (*__rex_getbitmap)(memmap *);
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extern unsigned long *(*__rex_slot_address)(int);
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extern void *(*__rex_gettcinfo)(void);
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extern int (*__rex_getsysid)(void);
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extern void (*__rex_clear_cache)(void);
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extern int (*__prom_getchar)(void);
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extern char *(*__prom_getenv)(char *);
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extern int (*__prom_printf)(char *, ...);
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extern int (*__pmax_open)(char*, int);
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extern int (*__pmax_lseek)(int, long, int);
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extern int (*__pmax_read)(int, void *, int);
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extern int (*__pmax_close)(int);
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#ifdef CONFIG_64BIT
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/*
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* On MIPS64 we have to call PROM functions via a helper
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* dispatcher to accommodate ABI incompatibilities.
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*/
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#define __DEC_PROM_O32(fun, arg) fun arg __asm__(#fun); \
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__asm__(#fun " = call_o32")
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int __DEC_PROM_O32(_rex_bootinit, (int (*)(void), void *));
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int __DEC_PROM_O32(_rex_bootread, (int (*)(void), void *));
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int __DEC_PROM_O32(_rex_getbitmap, (int (*)(memmap *), void *, memmap *));
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unsigned long *__DEC_PROM_O32(_rex_slot_address,
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(unsigned long *(*)(int), void *, int));
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void *__DEC_PROM_O32(_rex_gettcinfo, (void *(*)(void), void *));
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int __DEC_PROM_O32(_rex_getsysid, (int (*)(void), void *));
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void __DEC_PROM_O32(_rex_clear_cache, (void (*)(void), void *));
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int __DEC_PROM_O32(_prom_getchar, (int (*)(void), void *));
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char *__DEC_PROM_O32(_prom_getenv, (char *(*)(char *), void *, char *));
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int __DEC_PROM_O32(_prom_printf, (int (*)(char *, ...), void *, char *, ...));
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#define rex_bootinit() _rex_bootinit(__rex_bootinit, NULL)
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#define rex_bootread() _rex_bootread(__rex_bootread, NULL)
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#define rex_getbitmap(x) _rex_getbitmap(__rex_getbitmap, NULL, x)
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#define rex_slot_address(x) _rex_slot_address(__rex_slot_address, NULL, x)
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#define rex_gettcinfo() _rex_gettcinfo(__rex_gettcinfo, NULL)
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#define rex_getsysid() _rex_getsysid(__rex_getsysid, NULL)
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#define rex_clear_cache() _rex_clear_cache(__rex_clear_cache, NULL)
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#define prom_getchar() _prom_getchar(__prom_getchar, NULL)
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#define prom_getenv(x) _prom_getenv(__prom_getenv, NULL, x)
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#define prom_printf(x...) _prom_printf(__prom_printf, NULL, x)
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#else /* !CONFIG_64BIT */
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/*
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* On plain MIPS we just call PROM functions directly.
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*/
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#define rex_bootinit __rex_bootinit
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#define rex_bootread __rex_bootread
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#define rex_getbitmap __rex_getbitmap
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#define rex_slot_address __rex_slot_address
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#define rex_gettcinfo __rex_gettcinfo
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#define rex_getsysid __rex_getsysid
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#define rex_clear_cache __rex_clear_cache
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#define prom_getchar __prom_getchar
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#define prom_getenv __prom_getenv
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#define prom_printf __prom_printf
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#define pmax_open __pmax_open
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#define pmax_lseek __pmax_lseek
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#define pmax_read __pmax_read
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#define pmax_close __pmax_close
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#endif /* !CONFIG_64BIT */
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extern void prom_meminit(u32);
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extern void prom_identify_arch(u32);
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extern void prom_init_cmdline(s32, s32 *, u32);
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extern void register_prom_console(void);
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extern void unregister_prom_console(void);
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#endif /* _ASM_DEC_PROM_H */
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