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arm64: provide an optimized arch_page_phys_get()

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The AT instruction gives the corresponding physical address directly.
Much faster than the default implementation.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2021-05-07 18:57:24 -04:00 • committed by Anas Nashif
commit 5f6e257b0b
1 changed files with 21 additions and 0 deletions
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21
arch/arm64/core/mmu.c
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@ -908,6 +908,27 @@ void arch_mem_unmap(void *addr, size_t size)
}
}
int arch_page_phys_get(void *virt, uintptr_t *phys)
{
uint64_t par;
int key;
key = arch_irq_lock();
__asm__ volatile ("at S1E1R, %0" : : "r" (virt));
isb();
par = read_sysreg(PAR_EL1);
arch_irq_unlock(key);
if (par & BIT(0)) {
return -EFAULT;
}
if (phys) {
*phys = par & GENMASK(47, 12);
}
return 0;
}
#ifdef CONFIG_USERSPACE
static inline bool is_ptable_active(struct arm_mmu_ptables *ptables)