diff options
| -rw-r--r-- | arch/powerpc/Kconfig | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/cputable.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 2 | ||||
| -rw-r--r-- | include/asm-powerpc/cputable.h | 10 |
5 files changed, 19 insertions, 4 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 291c95ac4b31..0b2d05da89d7 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -706,7 +706,7 @@ config FORCE_MAX_ZONEORDER config MATH_EMULATION bool "Math emulation" - depends on 4xx || 8xx || E200 || E500 + depends on 4xx || 8xx || E200 || PPC_83xx || E500 ---help--- Some PowerPC chips designed for embedded applications do not have a floating-point unit and therefore do not implement the diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c index 9d1614c3ce67..11bfbaf655b5 100644 --- a/arch/powerpc/kernel/cputable.c +++ b/arch/powerpc/kernel/cputable.c @@ -833,7 +833,7 @@ static struct cpu_spec cpu_specs[] = { .pvr_mask = 0x7fff0000, .pvr_value = 0x00840000, .cpu_name = "e300c2", - .cpu_features = CPU_FTRS_E300, + .cpu_features = CPU_FTRS_E300C2, .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU, .icache_bsize = 32, .dcache_bsize = 32, diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index d88e182e40b3..9417cf5b4b7e 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -437,6 +437,13 @@ Alignment: /* Floating-point unavailable */ . = 0x800 FPUnavailable: +BEGIN_FTR_SECTION +/* + * Certain Freescale cores don't have a FPU and treat fp instructions + * as a FP Unavailable exception. Redirect to illegal/emulation handling. + */ + b ProgramCheck +END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE) EXCEPTION_PROLOG bne load_up_fpu /* if from user, just load it up */ addi r3,r1,STACK_FRAME_OVERHEAD diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 0d4e203fa7a0..fde820e52d03 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -782,6 +782,8 @@ void __kprobes program_check_exception(struct pt_regs *regs) unsigned int reason = get_reason(regs); extern int do_mathemu(struct pt_regs *regs); + /* We can now get here via a FP Unavailable exception if the core + * has no FPU, in that case no reason flags will be set */ #ifdef CONFIG_MATH_EMULATION /* (reason & REASON_ILLEGAL) would be the obvious thing here, * but there seems to be a hardware bug on the 405GP (RevD) diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h index 6fe5c9d4ca3b..aca72f90849e 100644 --- a/include/asm-powerpc/cputable.h +++ b/include/asm-powerpc/cputable.h @@ -126,6 +126,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start, #define CPU_FTR_NODSISRALIGN ASM_CONST(0x0000000000100000) #define CPU_FTR_PPC_LE ASM_CONST(0x0000000000200000) #define CPU_FTR_REAL_LE ASM_CONST(0x0000000000400000) +#define CPU_FTR_FPU_UNAVAILABLE ASM_CONST(0x0000000000800000) /* * Add the 64-bit processor unique features in the top half of the word; @@ -295,6 +296,9 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start, #define CPU_FTRS_E300 (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE | \ CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS | \ CPU_FTR_COMMON) +#define CPU_FTRS_E300C2 (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE | \ + CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS | \ + CPU_FTR_COMMON | CPU_FTR_FPU_UNAVAILABLE) #define CPU_FTRS_CLASSIC32 (CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE | \ CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE) #define CPU_FTRS_8XX (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB) @@ -364,7 +368,8 @@ enum { CPU_FTRS_7450_21 | CPU_FTRS_7450_23 | CPU_FTRS_7455_1 | CPU_FTRS_7455_20 | CPU_FTRS_7455 | CPU_FTRS_7447_10 | CPU_FTRS_7447 | CPU_FTRS_7447A | CPU_FTRS_82XX | - CPU_FTRS_G2_LE | CPU_FTRS_E300 | CPU_FTRS_CLASSIC32 | + CPU_FTRS_G2_LE | CPU_FTRS_E300 | CPU_FTRS_E300C2 | + CPU_FTRS_CLASSIC32 | #else CPU_FTRS_GENERIC_32 | #endif @@ -403,7 +408,8 @@ enum { CPU_FTRS_7450_21 & CPU_FTRS_7450_23 & CPU_FTRS_7455_1 & CPU_FTRS_7455_20 & CPU_FTRS_7455 & CPU_FTRS_7447_10 & CPU_FTRS_7447 & CPU_FTRS_7447A & CPU_FTRS_82XX & - CPU_FTRS_G2_LE & CPU_FTRS_E300 & CPU_FTRS_CLASSIC32 & + CPU_FTRS_G2_LE & CPU_FTRS_E300 & CPU_FTRS_E300C2 & + CPU_FTRS_CLASSIC32 & #else CPU_FTRS_GENERIC_32 & #endif |