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[81.231.233.234]) by smtp.gmail.com with ESMTPSA id n142sm3870532lfb.34.2017.01.30.09.22.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Jan 2017 09:22:01 -0800 (PST) From: "Edgar E. Iglesias" To: xen-devel@lists.xen.org Date: Mon, 30 Jan 2017 18:21:53 +0100 Message-Id: <1485796915-9372-5-git-send-email-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1485796915-9372-1-git-send-email-edgar.iglesias@gmail.com> References: <1485796915-9372-1-git-send-email-edgar.iglesias@gmail.com> Cc: edgar.iglesias@xilinx.com, julien.grall@arm.com, sstabellini@kernel.org Subject: [Xen-devel] [RFC v1 4/6] xen/arm: Introduce call_smcc64 X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: "Edgar E. Iglesias" Introduce call_smcc64, a helper function to issue 64-bit SMC calls that follow the SMC Calling Convention. This includes returning up to 4 64-bit values. Signed-off-by: Edgar E. Iglesias --- xen/include/asm-arm/processor.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h index afc0e9a..a604f8c 100644 --- a/xen/include/asm-arm/processor.h +++ b/xen/include/asm-arm/processor.h @@ -706,6 +706,46 @@ void vcpu_regs_user_to_hyp(struct vcpu *vcpu, int call_smc(register_t function_id, register_t arg0, register_t arg1, register_t arg2); +/* + * Helper to issue a 64-bit SMC according to the SMC Calling Convention. + * + * @fid: Function Identifier + * @a0 - a5: 6 arguments + * @ret: Pointer to 4 register_t carrying return values + */ +static inline register_t call_smcc64(register_t fid, + register_t a0, + register_t a1, + register_t a2, + register_t a3, + register_t a4, + register_t a5, + register_t *ret) +{ + register register_t x0 asm("x0") = fid; + register register_t x1 asm("x1") = a0; + register register_t x2 asm("x2") = a1; + register register_t x3 asm("x3") = a2; + register register_t x4 asm("x4") = a3; + register register_t x5 asm("x5") = a4; + register register_t x6 asm("x6") = a5; + + asm volatile ("smc #0\n" + : "+r" (x0), "+r" (x1), "+r" (x2), "+r" (x3), + "+r" (x4), "+r" (x5), "+r" (x6) + : + : "x7", "x8", "x9", "x10", "x11", "x12", + "x13", "x14", "x15", "x16", "x17" ); + + if (ret) { + ret[0] = x0; + ret[1] = x1; + ret[2] = x2; + ret[3] = x3; + } + return x0; +} + void do_trap_guest_error(struct cpu_user_regs *regs); #endif /* __ASSEMBLY__ */