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MIPS: features: Add initial support for Segmentation Control registers 

MIPS32R3 introduced a new set of Segmentation Control registers which
increase the flexibility of the segmented-based memory scheme.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6131/
This commit is contained in:
Steven J. Hill 2013-11-14 16:12:24 +00:00 committed by Ralf Baechle
parent 1745c1ef88
commit 4a0156fbfb
4 changed files with 36 additions and 0 deletions
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4
arch/mips/include/asm/cpu-features.h
View File

@ -23,6 +23,10 @@
#ifndef cpu_has_tlbinv
#define cpu_has_tlbinv (cpu_data[0].options & MIPS_CPU_TLBINV)
#endif
#ifndef cpu_has_segments
#define cpu_has_segments (cpu_data[0].options & MIPS_CPU_SEGMENTS)
#endif
/*
* For the moment we don't consider R6000 and R8000 so we can assume that

1
arch/mips/include/asm/cpu.h
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@ -352,6 +352,7 @@ enum cpu_type_enum {
#define MIPS_CPU_RIXI 0x00800000 /* CPU has TLB Read/eXec Inhibit */
#define MIPS_CPU_MICROMIPS 0x01000000 /* CPU has microMIPS capability */
#define MIPS_CPU_TLBINV 0x02000000 /* CPU supports TLBINV/F */
#define MIPS_CPU_SEGMENTS 0x04000000 /* CPU supports Segmentation Control registers */
/*
* CPU ASE encodings

29
arch/mips/include/asm/mipsregs.h
View File

@ -664,6 +664,26 @@
#define MIPS_FPIR_L (_ULCAST_(1) << 21)
#define MIPS_FPIR_F64 (_ULCAST_(1) << 22)
/*
* Bits in the MIPS32 Memory Segmentation registers.
*/
#define MIPS_SEGCFG_PA_SHIFT 9
#define MIPS_SEGCFG_PA (_ULCAST_(127) << MIPS_SEGCFG_PA_SHIFT)
#define MIPS_SEGCFG_AM_SHIFT 4
#define MIPS_SEGCFG_AM (_ULCAST_(7) << MIPS_SEGCFG_AM_SHIFT)
#define MIPS_SEGCFG_EU_SHIFT 3
#define MIPS_SEGCFG_EU (_ULCAST_(1) << MIPS_SEGCFG_EU_SHIFT)
#define MIPS_SEGCFG_C_SHIFT 0
#define MIPS_SEGCFG_C (_ULCAST_(7) << MIPS_SEGCFG_C_SHIFT)
#define MIPS_SEGCFG_UUSK _ULCAST_(7)
#define MIPS_SEGCFG_USK _ULCAST_(5)
#define MIPS_SEGCFG_MUSUK _ULCAST_(4)
#define MIPS_SEGCFG_MUSK _ULCAST_(3)
#define MIPS_SEGCFG_MSK _ULCAST_(2)
#define MIPS_SEGCFG_MK _ULCAST_(1)
#define MIPS_SEGCFG_UK _ULCAST_(0)
#ifndef __ASSEMBLY__
/*
@ -1138,6 +1158,15 @@ do { \
#define read_c0_ebase() __read_32bit_c0_register($15, 1)
#define write_c0_ebase(val) __write_32bit_c0_register($15, 1, val)
/* MIPSR3 */
#define read_c0_segctl0() __read_32bit_c0_register($5, 2)
#define write_c0_segctl0(val) __write_32bit_c0_register($5, 2, val)
#define read_c0_segctl1() __read_32bit_c0_register($5, 3)
#define write_c0_segctl1(val) __write_32bit_c0_register($5, 3, val)
#define read_c0_segctl2() __read_32bit_c0_register($5, 4)
#define write_c0_segctl2(val) __write_32bit_c0_register($5, 4, val)
/* Cavium OCTEON (cnMIPS) */
#define read_c0_cvmcount() __read_ulong_c0_register($9, 6)

2
arch/mips/kernel/cpu-probe.c
View File

@ -272,6 +272,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_MICROMIPS;
if (config3 & MIPS_CONF3_VZ)
c->ases |= MIPS_ASE_VZ;
if (config3 & MIPS_CONF3_SC)
c->options |= MIPS_CPU_SEGMENTS;
return config3 & MIPS_CONF_M;
}