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tcg/aarch64: Detect have_lse, have_lse2 for darwin

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These features are present for Apple M1.

Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-15 20:11:03 -06:00
parent b764941955
commit 1ce12a8c83
1 changed files with 28 additions and 0 deletions
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28
tcg/aarch64/tcg-target.c.inc
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@ -16,6 +16,9 @@
#ifdef __linux__ #ifdef __linux__
#include <asm/hwcap.h> #include <asm/hwcap.h>
#endif #endif
#ifdef CONFIG_DARWIN
#include <sys/sysctl.h>
#endif
/* We're going to re-use TCGType in setting of the SF bit, which controls /* We're going to re-use TCGType in setting of the SF bit, which controls
the size of the operation performed. If we know the values match, it the size of the operation performed. If we know the values match, it
@ -2903,6 +2906,27 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
} }
} }
#ifdef CONFIG_DARWIN
static bool sysctl_for_bool(const char *name)
{
int val = 0;
size_t len = sizeof(val);
if (sysctlbyname(name, &val, &len, NULL, 0) == 0) {
return val != 0;
}
/*
* We might in the future ask for properties not present in older kernels,
* but we're only asking about static properties, all of which should be
* 'int'. So we shouln't see ENOMEM (val too small), or any of the other
* more exotic errors.
*/
assert(errno == ENOENT);
return false;
}
#endif
static void tcg_target_init(TCGContext *s) static void tcg_target_init(TCGContext *s)
{ {
#ifdef __linux__ #ifdef __linux__
@ -2910,6 +2934,10 @@ static void tcg_target_init(TCGContext *s)
have_lse = hwcap & HWCAP_ATOMICS; have_lse = hwcap & HWCAP_ATOMICS;
have_lse2 = hwcap & HWCAP_USCAT; have_lse2 = hwcap & HWCAP_USCAT;
#endif #endif
#ifdef CONFIG_DARWIN
have_lse = sysctl_for_bool("hw.optional.arm.FEAT_LSE");
have_lse2 = sysctl_for_bool("hw.optional.arm.FEAT_LSE2");
#endif
tcg_target_available_regs[TCG_TYPE_I32] = 0xffffffffu; tcg_target_available_regs[TCG_TYPE_I32] = 0xffffffffu;
tcg_target_available_regs[TCG_TYPE_I64] = 0xffffffffu; tcg_target_available_regs[TCG_TYPE_I64] = 0xffffffffu;