diff options
| author | Steven J. Hill <Steven.Hill@imgtec.com> | 2013-06-05 21:25:17 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-07-01 15:10:58 +0200 |
| commit | c6213c6c9c189aeb97010673e3129a8929d2223e (patch) | |
| tree | 1b0eb42862e8b71accb5d2a0021400eea99d79a6 /arch/mips | |
| parent | fe6d29095d4370bed3a525404c45bbd6aa7c191b (diff) | |
MIPS: microMIPS: Fix improper definition of ISA exception bit.
The ISA exception bit selects whether exceptions are taken in classic
or microMIPS mode. This bit is Config3.ISAOnExc and was improperly
defined as bits 16 and 17 instead of just bit 16. A new function was
added so that platforms could set this bit when running a kernel
compiled with only microMIPS instructions.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5377/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 3 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 9 |
3 files changed, 10 insertions, 4 deletions
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index 87e6207b05e..fed1c3e9b48 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -596,7 +596,7 @@ #define MIPS_CONF3_RXI (_ULCAST_(1) << 12) #define MIPS_CONF3_ULRI (_ULCAST_(1) << 13) #define MIPS_CONF3_ISA (_ULCAST_(3) << 14) -#define MIPS_CONF3_ISA_OE (_ULCAST_(3) << 16) +#define MIPS_CONF3_ISA_OE (_ULCAST_(1) << 16) #define MIPS_CONF3_VZ (_ULCAST_(1) << 23) #define MIPS_CONF4_MMUSIZEEXT (_ULCAST_(255) << 0) diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index f87039dbefe..c7b1b3c5a76 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -269,9 +269,6 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c) c->options |= MIPS_CPU_ULRI; if (config3 & MIPS_CONF3_ISA) c->options |= MIPS_CPU_MICROMIPS; -#ifdef CONFIG_CPU_MICROMIPS - write_c0_config3(read_c0_config3() | MIPS_CONF3_ISA_OE); -#endif if (config3 & MIPS_CONF3_VZ) c->ases |= MIPS_ASE_VZ; diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index d97ea234e2d..b0f3ad26063 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1878,6 +1878,15 @@ void __init trap_init(void) ebase += (read_c0_ebase() & 0x3ffff000); } + if (cpu_has_mmips) { + unsigned int config3 = read_c0_config3(); + + if (IS_ENABLED(CONFIG_CPU_MICROMIPS)) + write_c0_config3(config3 | MIPS_CONF3_ISA_OE); + else + write_c0_config3(config3 & ~MIPS_CONF3_ISA_OE); + } + if (board_ebase_setup) board_ebase_setup(); per_cpu_trap_init(true); |