[PATCH v2 08/10] arm/page: Get rid of READ/WRITE_SYSREG32

From: Michal Orzel <michal.orzel@arm.com>
To: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
	bertrand.marquis@arm.com, Julien Grall <jgrall@amazon.com>
Subject: [PATCH v2 08/10] arm/page: Get rid of READ/WRITE_SYSREG32
Date: Tue, 27 Apr 2021 11:35:44 +0200	[thread overview]
Message-ID: <20210427093546.30703-9-michal.orzel@arm.com> (raw)
In-Reply-To: <20210427093546.30703-1-michal.orzel@arm.com>

AArch64 registers are 64bit whereas AArch32 registers
are 32bit or 64bit. MSR/MRS are expecting 64bit values thus
we should get rid of helpers READ/WRITE_SYSREG32
in favour of using READ/WRITE_SYSREG.
We should also use register_t type when reading sysregs
which can correspond to uint64_t or uint32_t.
Even though many AArch64 registers have upper 32bit reserved
it does not mean that they can't be widen in the future.

Modify accesses to CTR_EL0 to use READ/WRITE_SYSREG.

Signed-off-by: Michal Orzel <michal.orzel@arm.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
---
 xen/include/asm-arm/page.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index 131507a517..c6f9fb0d4e 100644
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -137,10 +137,10 @@ extern size_t dcache_line_bytes;
 
 static inline size_t read_dcache_line_bytes(void)
 {
-    uint32_t ctr;
+    register_t ctr;
 
     /* Read CTR */
-    ctr = READ_SYSREG32(CTR_EL0);
+    ctr = READ_SYSREG(CTR_EL0);
 
     /* Bits 16-19 are the log2 number of words in the cacheline. */
     return (size_t) (4 << ((ctr >> 16) & 0xf));
-- 
2.29.0


