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MIPS: Clean up RDHWR handling

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No preprocessor definitions are used in the handling of the registers
accessible with the RDHWR instruction, nor the corresponding bits in the
CP0 HWREna register.

Add definitions for both the register numbers (MIPS_HWR_*) and HWREna
bits (MIPS_HWRENA_*) in asm/mipsregs.h and make use of them in the
initialisation of HWREna and emulation of the RDHWR instruction.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: David Daney <david.daney@cavium.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan 2016-06-15 19:29:52 +01:00 committed by Paolo Bonzini
parent e57759306c
commit aff565aab9
4 changed files with 35 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h
View File

@ -55,7 +55,7 @@
#define cpu_has_mipsmt 0
#define cpu_has_vint 0
#define cpu_has_veic 0
#define cpu_hwrena_impl_bits 0xc0000000
#define cpu_hwrena_impl_bits (MIPS_HWRENA_IMPL1 | MIPS_HWRENA_IMPL2)
#define cpu_has_wsbh 1
#define cpu_has_rixi (cpu_data[0].cputype != CPU_CAVIUM_OCTEON)

20
arch/mips/include/asm/mipsregs.h
View File

@ -53,7 +53,7 @@
#define CP0_SEGCTL2 $5, 4
#define CP0_WIRED $6
#define CP0_INFO $7
#define CP0_HWRENA $7, 0
#define CP0_HWRENA $7
#define CP0_BADVADDR $8
#define CP0_BADINSTR $8, 1
#define CP0_COUNT $9
@ -853,6 +853,24 @@
#define MIPS_CDMMBASE_ADDR_SHIFT 11
#define MIPS_CDMMBASE_ADDR_START 15
/* RDHWR register numbers */
#define MIPS_HWR_CPUNUM 0 /* CPU number */
#define MIPS_HWR_SYNCISTEP 1 /* SYNCI step size */
#define MIPS_HWR_CC 2 /* Cycle counter */
#define MIPS_HWR_CCRES 3 /* Cycle counter resolution */
#define MIPS_HWR_ULR 29 /* UserLocal */
#define MIPS_HWR_IMPL1 30 /* Implementation dependent */
#define MIPS_HWR_IMPL2 31 /* Implementation dependent */
/* Bits in HWREna register */
#define MIPS_HWRENA_CPUNUM (_ULCAST_(1) << MIPS_HWR_CPUNUM)
#define MIPS_HWRENA_SYNCISTEP (_ULCAST_(1) << MIPS_HWR_SYNCISTEP)
#define MIPS_HWRENA_CC (_ULCAST_(1) << MIPS_HWR_CC)
#define MIPS_HWRENA_CCRES (_ULCAST_(1) << MIPS_HWR_CCRES)
#define MIPS_HWRENA_ULR (_ULCAST_(1) << MIPS_HWR_ULR)
#define MIPS_HWRENA_IMPL1 (_ULCAST_(1) << MIPS_HWR_IMPL1)
#define MIPS_HWRENA_IMPL2 (_ULCAST_(1) << MIPS_HWR_IMPL2)
/*
* Bitfields in the TX39 family CP0 Configuration Register 3
*/

17
arch/mips/kernel/traps.c
View File

@ -619,17 +619,17 @@ static int simulate_rdhwr(struct pt_regs *regs, int rd, int rt)
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
1, regs, 0);
switch (rd) {
case 0: /* CPU number */
case MIPS_HWR_CPUNUM: /* CPU number */
regs->regs[rt] = smp_processor_id();
return 0;
case 1: /* SYNCI length */
case MIPS_HWR_SYNCISTEP: /* SYNCI length */
regs->regs[rt] = min(current_cpu_data.dcache.linesz,
current_cpu_data.icache.linesz);
return 0;
case 2: /* Read count register */
case MIPS_HWR_CC: /* Read count register */
regs->regs[rt] = read_c0_count();
return 0;
case 3: /* Count register resolution */
case MIPS_HWR_CCRES: /* Count register resolution */
switch (current_cpu_type()) {
case CPU_20KC:
case CPU_25KF:
@ -639,7 +639,7 @@ static int simulate_rdhwr(struct pt_regs *regs, int rd, int rt)
regs->regs[rt] = 2;
}
return 0;
case 29:
case MIPS_HWR_ULR: /* Read UserLocal register */
regs->regs[rt] = ti->tp_value;
return 0;
default:
@ -2070,10 +2070,13 @@ static void configure_hwrena(void)
unsigned int hwrena = cpu_hwrena_impl_bits;
if (cpu_has_mips_r2_r6)
hwrena |= 0x0000000f;
hwrena |= MIPS_HWRENA_CPUNUM |
MIPS_HWRENA_SYNCISTEP |
MIPS_HWRENA_CC |
MIPS_HWRENA_CCRES;
if (!noulri && cpu_has_userlocal)
hwrena |= (1 << 29);
hwrena |= MIPS_HWRENA_ULR;
if (hwrena)
write_c0_hwrena(hwrena);

10
arch/mips/kvm/emulate.c
View File

@ -2296,17 +2296,17 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc,
goto emulate_ri;
}
switch (rd) {
case 0: /* CPU number */
case MIPS_HWR_CPUNUM: /* CPU number */
arch->gprs[rt] = 0;
break;
case 1: /* SYNCI length */
case MIPS_HWR_SYNCISTEP: /* SYNCI length */
arch->gprs[rt] = min(current_cpu_data.dcache.linesz,
current_cpu_data.icache.linesz);
break;
case 2: /* Read count register */
case MIPS_HWR_CC: /* Read count register */
arch->gprs[rt] = kvm_mips_read_count(vcpu);
break;
case 3: /* Count register resolution */
case MIPS_HWR_CCRES: /* Count register resolution */
switch (current_cpu_data.cputype) {
case CPU_20KC:
case CPU_25KF:
@ -2316,7 +2316,7 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc,
arch->gprs[rt] = 2;
}
break;
case 29:
case MIPS_HWR_ULR: /* Read UserLocal register */
arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0);
break;