X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseMemoryLibOptDxe%2FArm%2FSetMem.S;fp=MdePkg%2FLibrary%2FBaseMemoryLibOptDxe%2FArm%2FSetMem.S;h=c1755539d36abb94482679457591532ee0ccc1a0;hp=0000000000000000000000000000000000000000;hb=a37f660599e8aefabf29a1ac9bef02ce55a3130c;hpb=01f688be90f59cd1ea92195bd238e8d97295fbf1

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S
new file mode 100644
index 0000000000..c1755539d3
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S
@@ -0,0 +1,77 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
+#
+# This program and the accompanying materials are licensed and made available
+# under the terms and conditions of the BSD License which accompanies this
+# distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+    .text
+    .thumb
+    .syntax unified
+    .align  5
+ASM_GLOBAL ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+    movs    r2, #0
+
+ASM_GLOBAL ASM_PFX(InternalMemSetMem)
+ASM_PFX(InternalMemSetMem):
+    uxtb    r2, r2
+    orr     r2, r2, r2, lsl #8
+
+ASM_GLOBAL ASM_PFX(InternalMemSetMem16)
+ASM_PFX(InternalMemSetMem16):
+    uxth    r2, r2
+    orr     r2, r2, r2, lsl #16
+
+ASM_GLOBAL ASM_PFX(InternalMemSetMem32)
+ASM_PFX(InternalMemSetMem32):
+    mov     r3, r2
+
+ASM_GLOBAL ASM_PFX(InternalMemSetMem64)
+ASM_PFX(InternalMemSetMem64):
+    push    {r4, lr}
+    cmp     r1, #16                 // fewer than 16 bytes of input?
+    add     r1, r1, r0              // r1 := dst + length
+    add     lr, r0, #16
+    blt     2f
+    bic     lr, lr, #15             // align output pointer
+
+    str     r2, [r0]                // potentially unaligned store of 4 bytes
+    str     r3, [r0, #4]            // potentially unaligned store of 4 bytes
+    str     r2, [r0, #8]            // potentially unaligned store of 4 bytes
+    str     r3, [r0, #12]           // potentially unaligned store of 4 bytes
+    beq     1f
+
+0:  add     lr, lr, #16             // advance the output pointer by 16 bytes
+    subs    r4, r1, lr              // past the output?
+    blt     3f                      // break out of the loop
+    strd    r2, r3, [lr, #-16]      // aligned store of 16 bytes
+    strd    r2, r3, [lr, #-8]
+    bne     0b                      // goto beginning of loop
+1:  pop     {r4, pc}
+
+2:  subs    r4, r1, lr
+3:  adds    r4, r4, #16
+    subs    r1, r1, #8
+    cmp     r4, #4                  // between 4 and 15 bytes?
+    blt     4f
+    cmp     r4, #8                  // between 8 and 15 bytes?
+    str     r2, [lr, #-16]          // overlapping store of 4 + (4 + 4) + 4 bytes
+    itt     gt
+    strgt   r3, [lr, #-12]
+    strgt   r2, [r1]
+    str     r3, [r1, #4]
+    pop     {r4, pc}
+
+4:  cmp     r4, #2                  // 2 or 3 bytes?
+    strb    r2, [lr, #-16]          // store 1 byte
+    it      ge
+    strhge  r2, [r1, #6]            // store 2 bytes
+    pop     {r4, pc}