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4cdc1cd137
When the CPU is in wait state, do not wake-up if an interrupt can't be taken. This avoid host CPU running at 100% if a device (e.g. timer) has an interrupt line left enabled. Also factorize code to check if interrupts are enabled in cpu_mips_hw_interrupts_pending(). Based on a patch from Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
#if !defined(__QEMU_MIPS_EXEC_H__)
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#define __QEMU_MIPS_EXEC_H__
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//#define DEBUG_OP
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#include "config.h"
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#include "mips-defs.h"
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#include "dyngen-exec.h"
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#include "cpu-defs.h"
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register struct CPUMIPSState *env asm(AREG0);
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#include "cpu.h"
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#include "exec-all.h"
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#if !defined(CONFIG_USER_ONLY)
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#include "softmmu_exec.h"
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#endif /* !defined(CONFIG_USER_ONLY) */
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static inline int cpu_has_work(CPUState *env)
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{
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int has_work = 0;
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/* It is implementation dependent if non-enabled interrupts
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wake-up the CPU, however most of the implementations only
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check for interrupts that can be taken. */
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if ((env->interrupt_request & CPU_INTERRUPT_HARD) &&
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cpu_mips_hw_interrupts_pending(env)) {
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has_work = 1;
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}
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if (env->interrupt_request & CPU_INTERRUPT_TIMER) {
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has_work = 1;
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}
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return has_work;
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}
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static inline int cpu_halted(CPUState *env)
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{
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if (!env->halted)
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return 0;
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if (cpu_has_work(env)) {
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env->halted = 0;
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return 0;
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}
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return EXCP_HALTED;
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}
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static inline void compute_hflags(CPUState *env)
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{
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env->hflags &= ~(MIPS_HFLAG_COP1X | MIPS_HFLAG_64 | MIPS_HFLAG_CP0 |
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MIPS_HFLAG_F64 | MIPS_HFLAG_FPU | MIPS_HFLAG_KSU |
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MIPS_HFLAG_UX);
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if (!(env->CP0_Status & (1 << CP0St_EXL)) &&
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!(env->CP0_Status & (1 << CP0St_ERL)) &&
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!(env->hflags & MIPS_HFLAG_DM)) {
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env->hflags |= (env->CP0_Status >> CP0St_KSU) & MIPS_HFLAG_KSU;
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}
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#if defined(TARGET_MIPS64)
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if (((env->hflags & MIPS_HFLAG_KSU) != MIPS_HFLAG_UM) ||
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(env->CP0_Status & (1 << CP0St_PX)) ||
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(env->CP0_Status & (1 << CP0St_UX)))
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env->hflags |= MIPS_HFLAG_64;
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if (env->CP0_Status & (1 << CP0St_UX))
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env->hflags |= MIPS_HFLAG_UX;
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#endif
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if ((env->CP0_Status & (1 << CP0St_CU0)) ||
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!(env->hflags & MIPS_HFLAG_KSU))
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env->hflags |= MIPS_HFLAG_CP0;
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if (env->CP0_Status & (1 << CP0St_CU1))
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env->hflags |= MIPS_HFLAG_FPU;
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if (env->CP0_Status & (1 << CP0St_FR))
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env->hflags |= MIPS_HFLAG_F64;
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if (env->insn_flags & ISA_MIPS32R2) {
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if (env->active_fpu.fcr0 & (1 << FCR0_F64))
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env->hflags |= MIPS_HFLAG_COP1X;
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} else if (env->insn_flags & ISA_MIPS32) {
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if (env->hflags & MIPS_HFLAG_64)
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env->hflags |= MIPS_HFLAG_COP1X;
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} else if (env->insn_flags & ISA_MIPS4) {
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/* All supported MIPS IV CPUs use the XX (CU3) to enable
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and disable the MIPS IV extensions to the MIPS III ISA.
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Some other MIPS IV CPUs ignore the bit, so the check here
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would be too restrictive for them. */
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if (env->CP0_Status & (1 << CP0St_CU3))
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env->hflags |= MIPS_HFLAG_COP1X;
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}
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}
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static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
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{
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env->active_tc.PC = tb->pc;
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env->hflags &= ~MIPS_HFLAG_BMASK;
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env->hflags |= tb->flags & MIPS_HFLAG_BMASK;
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}
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#endif /* !defined(__QEMU_MIPS_EXEC_H__) */
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