diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/mips/include/arch/cpu.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/arch/mips/include/arch/cpu.h b/src/arch/mips/include/arch/cpu.h index 0ac9f31700..4f4c376eee 100644 --- a/src/arch/mips/include/arch/cpu.h +++ b/src/arch/mips/include/arch/cpu.h @@ -40,4 +40,52 @@ struct cpu_info { #endif /* !__PRE_RAM__ */ +/*************************************************************************** + * The following section was copied from arch/mips/include/asm/mipsregs.h in + * the 3.14 kernel tree. + */ + +/* + * Macros to access the system control coprocessor + */ + +#define __read_32bit_c0_register(source, sel) \ +({ int __res; \ + if (sel == 0) \ + __asm__ __volatile__( \ + "mfc0\t%0, " #source "\n\t" \ + : "=r" (__res)); \ + else \ + __asm__ __volatile__( \ + ".set\tmips32\n\t" \ + "mfc0\t%0, " #source ", " #sel "\n\t" \ + ".set\tmips0\n\t" \ + : "=r" (__res)); \ + __res; \ +}) + +#define __write_32bit_c0_register(register, sel, value) \ +do { \ + if (sel == 0) \ + __asm__ __volatile__( \ + "mtc0\t%z0, " #register "\n\t" \ + : : "Jr" ((unsigned int)(value))); \ + else \ + __asm__ __volatile__( \ + ".set\tmips32\n\t" \ + "mtc0\t%z0, " #register ", " #sel "\n\t" \ + ".set\tmips0" \ + : : "Jr" ((unsigned int)(value))); \ +} while (0) + +/* Shortcuts to access various internal registers, keep adding as needed. */ +#define read_c0_count() __read_32bit_c0_register($9, 0) +#define write_c0_count(val) __write_32bit_c0_register($9, 0, (val)) + +#define read_c0_cause() __read_32bit_c0_register($13, 0) +#define write_c0_cause(val) __write_32bit_c0_register($13, 0, (val)) + +#define C0_CAUSE_DC (1 << 27) +/**************************************************************************/ + #endif /* __MIPS_ARCH_CPU_H */ |