87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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*
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* (C) COPYRIGHT 2015 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifdef CONFIG_ARM64
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#include <mali_kbase.h>
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#include <mali_kbase_smc.h>
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#include <linux/compiler.h>
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/* __asmeq is not available on Kernel versions >= 4.20 */
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#ifndef __asmeq
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/*
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* This is used to ensure the compiler did actually allocate the register we
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* asked it for some inline assembly sequences. Apparently we can't trust the
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* compiler from one version to another so a bit of paranoia won't hurt. This
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* string is meant to be concatenated with the inline asm string and will
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* cause compilation to stop on mismatch. (for details, see gcc PR 15089)
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*/
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#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
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#endif
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static noinline u64 invoke_smc_fid(u64 function_id,
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u64 arg0, u64 arg1, u64 arg2)
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{
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register u64 x0 asm("x0") = function_id;
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register u64 x1 asm("x1") = arg0;
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register u64 x2 asm("x2") = arg1;
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register u64 x3 asm("x3") = arg2;
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asm volatile(
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__asmeq("%0", "x0")
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__asmeq("%1", "x1")
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__asmeq("%2", "x2")
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__asmeq("%3", "x3")
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"smc #0\n"
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: "+r" (x0)
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: "r" (x1), "r" (x2), "r" (x3));
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return x0;
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}
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u64 kbase_invoke_smc_fid(u32 fid, u64 arg0, u64 arg1, u64 arg2)
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{
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/* Is fast call (bit 31 set) */
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KBASE_DEBUG_ASSERT(fid & ~SMC_FAST_CALL);
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/* bits 16-23 must be zero for fast calls */
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KBASE_DEBUG_ASSERT((fid & (0xFF << 16)) == 0);
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return invoke_smc_fid(fid, arg0, arg1, arg2);
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}
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u64 kbase_invoke_smc(u32 oen, u16 function_number, bool smc64,
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u64 arg0, u64 arg1, u64 arg2)
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{
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u32 fid = 0;
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/* Only the six bits allowed should be used. */
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KBASE_DEBUG_ASSERT((oen & ~SMC_OEN_MASK) == 0);
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fid |= SMC_FAST_CALL; /* Bit 31: Fast call */
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if (smc64)
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fid |= SMC_64; /* Bit 30: 1=SMC64, 0=SMC32 */
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fid |= oen; /* Bit 29:24: OEN */
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/* Bit 23:16: Must be zero for fast calls */
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fid |= (function_number); /* Bit 15:0: function number */
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return kbase_invoke_smc_fid(fid, arg0, arg1, arg2);
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}
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#endif /* CONFIG_ARM64 */
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