Config&ShellCode: 8550: Add ShellCode for Ayaneo Pocket S.

- Push Turbo key (Gpio109, active low) to enter uefi, otherwise enter android.

Author: sunflower2333

Config/DualBoot.Sm8550.cfg

@@ -0,0 +1,2 @@
+StackBase=0xC7CC0000
+StackSize=0x00400000

ShellCode/ShellCode.AYAPS.S

@@ -0,0 +1,13 @@
+.include "DummyHead.S"
+
+/* Shell Code for Ayaneo Pocket S */
+_ShellCodeStart:
+    movz    x4, #0xd000
+    movk    x4, #0x0f16, lsl #16    // Store 0xf16d000 to x4, which is io control of gpio109 on sm8550.
+    str     wzr, [x4], #4           // Set 0 in control reg, then x4 add 4
+    ldr     w5, [x4]                // Get status value from address stored in x4 and store it to w5.
+    and     w5, w5, #1              // w5 & 1 and save value in w5.
+    cbz     w5, _UEFI               // Compare w5 with 0, if w5 == 0 goto _UEFI, else execute next instruction(jmp Linux).
+
+.include "CommonTail.S"
+/* Do not remove the last line  */