aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/kernel
diff options
context:
space:
mode:
authorMaciej W. Rozycki <macro@linux-mips.org>2007-10-23 12:43:11 +0100
committerRalf Baechle <ralf@linux-mips.org>2008-01-29 10:14:54 +0000
commit20d60d9973c3b441902b0a3f4f6f7e7ade08f77d (patch)
tree2dbadcb5600fcb486612ec30d972e6c29195ee1d /arch/mips/kernel
parent2b22c034d04d3632a339d14d5803c8f94e412608 (diff)
[MIPS] R4000/R4400 errata workarounds
This is the gereric part of R4000/R4400 errata workarounds. They include compiler and assembler support as well as some source code modifications to address the problems with some combinations of multiply/divide+shift instructions as well as the daddi and daddiu instructions. Changes included are as follows: 1. New Kconfig options to select workarounds by platforms as necessary. 2. Arch top-level Makefile to pass necessary options to the compiler; also incompatible configurations are detected (-mno-sym32 unsupported as horribly intrusive for little gain). 3. Bug detection updated and shuffled -- the multiply/divide+shift problem is lethal enough that if not worked around it makes the kernel crash in time_init() because of a division by zero; the daddiu erratum might also trigger early potentially, though I have not observed it. On the other hand the daddi detection code requires the exception subsystem to have been initialised (and is there mainly for information). 4. r4k_daddiu_bug() added so that the existence of the erratum can be queried by code at the run time as necessary; useful for generated code like TLB fault and copy/clear page handlers. 5. __udelay() updated as it uses multiplication in inline assembly. Note that -mdaddi requires modified toolchain (which has been maintained by myself and available from my site for ~4years now -- versions covered are GCC 2.95.4 - 4.1.2 and binutils from 2.13 onwards). The -mfix-r4000 and -mfix-r4400 have been standard for a while though. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/cpu-bugs64.c47
-rw-r--r--arch/mips/kernel/setup.c4
2 files changed, 26 insertions, 25 deletions
diff --git a/arch/mips/kernel/cpu-bugs64.c b/arch/mips/kernel/cpu-bugs64.c
index af78456d413..417bb3e336a 100644
--- a/arch/mips/kernel/cpu-bugs64.c
+++ b/arch/mips/kernel/cpu-bugs64.c
@@ -18,6 +18,15 @@
#include <asm/mipsregs.h>
#include <asm/system.h>
+static char bug64hit[] __initdata =
+ "reliable operation impossible!\n%s";
+static char nowar[] __initdata =
+ "Please report to <linux-mips@linux-mips.org>.";
+static char r4kwar[] __initdata =
+ "Enable CPU_R4000_WORKAROUNDS to rectify.";
+static char daddiwar[] __initdata =
+ "Enable CPU_DADDI_WORKAROUNDS to rectify.";
+
static inline void align_mod(const int align, const int mod)
{
asm volatile(
@@ -155,13 +164,7 @@ static inline void check_mult_sh(void)
}
printk("no.\n");
- panic("Reliable operation impossible!\n"
-#ifndef CONFIG_CPU_R4000
- "Configure for R4000 to enable the workaround."
-#else
- "Please report to <linux-mips@linux-mips.org>."
-#endif
- );
+ panic(bug64hit, !R4000_WAR ? r4kwar : nowar);
}
static volatile int daddi_ov __initdata = 0;
@@ -233,15 +236,11 @@ static inline void check_daddi(void)
}
printk("no.\n");
- panic("Reliable operation impossible!\n"
-#if !defined(CONFIG_CPU_R4000) && !defined(CONFIG_CPU_R4400)
- "Configure for R4000 or R4400 to enable the workaround."
-#else
- "Please report to <linux-mips@linux-mips.org>."
-#endif
- );
+ panic(bug64hit, !DADDI_WAR ? daddiwar : nowar);
}
+int daddiu_bug __initdata = -1;
+
static inline void check_daddiu(void)
{
long v, w, tmp;
@@ -281,7 +280,9 @@ static inline void check_daddiu(void)
: "=&r" (v), "=&r" (w), "=&r" (tmp)
: "I" (0xffffffffffffdb9aUL), "I" (0x1234));
- if (v == w) {
+ daddiu_bug = v != w;
+
+ if (!daddiu_bug) {
printk("no.\n");
return;
}
@@ -303,18 +304,16 @@ static inline void check_daddiu(void)
}
printk("no.\n");
- panic("Reliable operation impossible!\n"
-#if !defined(CONFIG_CPU_R4000) && !defined(CONFIG_CPU_R4400)
- "Configure for R4000 or R4400 to enable the workaround."
-#else
- "Please report to <linux-mips@linux-mips.org>."
-#endif
- );
+ panic(bug64hit, !DADDI_WAR ? daddiwar : nowar);
}
-void __init check_bugs64(void)
+void __init check_bugs64_early(void)
{
check_mult_sh();
- check_daddi();
check_daddiu();
}
+
+void __init check_bugs64(void)
+{
+ check_daddi();
+}
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f8a535afce3..7b4418dd585 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -8,7 +8,7 @@
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
* Copyright (C) 1996 Stoned Elipot
* Copyright (C) 1999 Silicon Graphics, Inc.
- * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
+ * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
*/
#include <linux/init.h>
#include <linux/ioport.h>
@@ -24,6 +24,7 @@
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
+#include <asm/bugs.h>
#include <asm/cache.h>
#include <asm/cpu.h>
#include <asm/sections.h>
@@ -561,6 +562,7 @@ void __init setup_arch(char **cmdline_p)
}
#endif
cpu_report();
+ check_bugs_early();
#if defined(CONFIG_VT)
#if defined(CONFIG_VGA_CONSOLE)