diff options
Diffstat (limited to 'include/asm-mips/mipsregs.h')
| -rw-r--r-- | include/asm-mips/mipsregs.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h index 035ba0a9b0d..a2ef579f6b1 100644 --- a/include/asm-mips/mipsregs.h +++ b/include/asm-mips/mipsregs.h @@ -836,6 +836,9 @@ do { \ #define read_c0_cache() __read_32bit_c0_register($7, 0) /* TX39xx */ #define write_c0_cache(val) __write_32bit_c0_register($7, 0, val) +#define read_c0_badvaddr() __read_ulong_c0_register($8, 0) +#define write_c0_badvaddr(val) __write_ulong_c0_register($8, 0, val) + #define read_c0_count() __read_32bit_c0_register($9, 0) #define write_c0_count(val) __write_32bit_c0_register($9, 0, val) @@ -858,7 +861,19 @@ do { \ #define write_c0_compare3(val) __write_32bit_c0_register($11, 7, val) #define read_c0_status() __read_32bit_c0_register($12, 0) +#ifdef CONFIG_MIPS_MT_SMTC +#define write_c0_status(val) \ +do { \ + __write_32bit_c0_register($12, 0, val); \ + __ehb(); \ +} while (0) +#else +/* + * Legacy non-SMTC code, which may be hazardous + * but which might not support EHB + */ #define write_c0_status(val) __write_32bit_c0_register($12, 0, val) +#endif /* CONFIG_MIPS_MT_SMTC */ #define read_c0_cause() __read_32bit_c0_register($13, 0) #define write_c0_cause(val) __write_32bit_c0_register($13, 0, val) @@ -1001,6 +1016,9 @@ do { \ #define read_c0_taglo() __read_32bit_c0_register($28, 0) #define write_c0_taglo(val) __write_32bit_c0_register($28, 0, val) +#define read_c0_dtaglo() __read_32bit_c0_register($28, 2) +#define write_c0_dtaglo(val) __write_32bit_c0_register($28, 2, val) + #define read_c0_taghi() __read_32bit_c0_register($29, 0) #define write_c0_taghi(val) __write_32bit_c0_register($29, 0, val) @@ -1354,15 +1372,119 @@ static inline void tlb_write_random(void) /* * Manipulate bits in a c0 register. */ +#ifndef CONFIG_MIPS_MT_SMTC +/* + * SMTC Linux requires shutting-down microthread scheduling + * during CP0 register read-modify-write sequences. + */ +#define __BUILD_SET_C0(name) \ +static inline unsigned int \ +set_c0_##name(unsigned int set) \ +{ \ + unsigned int res; \ + \ + res = read_c0_##name(); \ + res |= set; \ + write_c0_##name(res); \ + \ + return res; \ +} \ + \ +static inline unsigned int \ +clear_c0_##name(unsigned int clear) \ +{ \ + unsigned int res; \ + \ + res = read_c0_##name(); \ + res &= ~clear; \ + write_c0_##name(res); \ + \ + return res; \ +} \ + \ +static inline unsigned int \ +change_c0_##name(unsigned int change, unsigned int new) \ +{ \ + unsigned int res; \ + \ + res = read_c0_##name(); \ + res &= ~change; \ + res |= (new & change); \ + write_c0_##name(res); \ + \ + return res; \ +} + +#else /* SMTC versions that manage MT scheduling */ + +#include <asm/interrupt.h> + +/* + * This is a duplicate of dmt() in mipsmtregs.h to avoid problems with + * header file recursion. + */ +static inline unsigned int __dmt(void) +{ + int res; + + __asm__ __volatile__( + " .set push \n" + " .set mips32r2 \n" + " .set noat \n" + " .word 0x41610BC1 # dmt $1 \n" + " ehb \n" + " move %0, $1 \n" + " .set pop \n" + : "=r" (res)); + + instruction_hazard(); + + return res; +} + +#define __VPECONTROL_TE_SHIFT 15 +#define __VPECONTROL_TE (1UL << __VPECONTROL_TE_SHIFT) + +#define __EMT_ENABLE __VPECONTROL_TE + +static inline void __emt(unsigned int previous) +{ + if ((previous & __EMT_ENABLE)) + __asm__ __volatile__( + " .set noreorder \n" + " .set mips32r2 \n" + " .word 0x41600be1 # emt \n" + " ehb \n" + " .set mips0 \n" + " .set reorder \n"); +} + +static inline void __ehb(void) +{ + __asm__ __volatile__( + " ehb \n"); +} + +/* + * Note that local_irq_save/restore affect TC-specific IXMT state, + * not Status.IE as in non-SMTC kernel. + */ + #define __BUILD_SET_C0(name) \ static inline unsigned int \ set_c0_##name(unsigned int set) \ { \ unsigned int res; \ + unsigned int omt; \ + unsigned int flags; \ \ + local_irq_save(flags); \ + omt = __dmt(); \ res = read_c0_##name(); \ res |= set; \ write_c0_##name(res); \ + __emt(omt); \ + local_irq_restore(flags); \ \ return res; \ } \ @@ -1371,10 +1493,16 @@ static inline unsigned int \ clear_c0_##name(unsigned int clear) \ { \ unsigned int res; \ + unsigned int omt; \ + unsigned int flags; \ \ + local_irq_save(flags); \ + omt = __dmt(); \ res = read_c0_##name(); \ res &= ~clear; \ write_c0_##name(res); \ + __emt(omt); \ + local_irq_restore(flags); \ \ return res; \ } \ @@ -1383,14 +1511,22 @@ static inline unsigned int \ change_c0_##name(unsigned int change, unsigned int new) \ { \ unsigned int res; \ + unsigned int omt; \ + unsigned int flags; \ \ + local_irq_save(flags); \ + \ + omt = __dmt(); \ res = read_c0_##name(); \ res &= ~change; \ res |= (new & change); \ write_c0_##name(res); \ + __emt(omt); \ + local_irq_restore(flags); \ \ return res; \ } +#endif __BUILD_SET_C0(status) __BUILD_SET_C0(cause) |