Commit 88ec7e25 authored by Raghavendra Rao Ananta's avatar Raghavendra Rao Ananta Committed by Marc Zyngier

KVM: arm64: selftests: Add MMIO readl/writel support

Define the readl() and writel() functions for the guests to
access (4-byte) the MMIO region.

The routines, and their dependents, are inspired from the kernel's
arch/arm64/include/asm/io.h and arch/arm64/include/asm/barrier.h.
Signed-off-by: default avatarRaghavendra Rao Ananta <rananta@google.com>
Reviewed-by: default avatarOliver Upton <oupton@google.com>
Reviewed-by: default avatarAndrew Jones <drjones@redhat.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-2-rananta@google.com
parent 9e1ff307
......@@ -9,6 +9,7 @@
#include "kvm_util.h"
#include <linux/stringify.h>
#include <linux/types.h>
#define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
......@@ -130,6 +131,49 @@ void vm_install_sync_handler(struct kvm_vm *vm,
val; \
})
#define isb() asm volatile("isb" : : : "memory")
#define isb() asm volatile("isb" : : : "memory")
#define dsb(opt) asm volatile("dsb " #opt : : : "memory")
#define dmb(opt) asm volatile("dmb " #opt : : : "memory")
#define dma_wmb() dmb(oshst)
#define __iowmb() dma_wmb()
#define dma_rmb() dmb(oshld)
#define __iormb(v) \
({ \
unsigned long tmp; \
\
dma_rmb(); \
\
/* \
* Courtesy of arch/arm64/include/asm/io.h: \
* Create a dummy control dependency from the IO read to any \
* later instructions. This ensures that a subsequent call \
* to udelay() will be ordered due to the ISB in __delay(). \
*/ \
asm volatile("eor %0, %1, %1\n" \
"cbnz %0, ." \
: "=r" (tmp) : "r" ((unsigned long)(v)) \
: "memory"); \
})
static __always_inline void __raw_writel(u32 val, volatile void *addr)
{
asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr));
}
static __always_inline u32 __raw_readl(const volatile void *addr)
{
u32 val;
asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
return val;
}
#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c));})
#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
#endif /* SELFTEST_KVM_PROCESSOR_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment