Decompile code_800E6840.c / osAiSetNextBuffer.c (#143)

* Decompile code_800E6840.c / osAiSetNextBuffer.c

* move status' assignment outside the condition

src/libultra_code/code_800E6840.c

@@ -0,0 +1,13 @@
+#include <global.h>
+
+void func_800E6840(void* buf, s32 size) {
+    OSIntMask prevMask = osSetIntMask(1);
+    osInvalDCache(buf, size);
+    osSetIntMask(prevMask);
+}
+
+void func_800E6880(void* buf, s32 size) {
+    OSIntMask prevMask = osSetIntMask(1);
+    osWritebackDCache(buf, size);
+    osSetIntMask(prevMask);
+}

src/libultra_code/osAiSetNextBuffer.c

@@ -0,0 +1,26 @@
+#include <global.h>
+#include <ultra64/hardware.h>
+
+s32 osAiSetNextBuffer(void* buf, u32 size) {
+    static u8 D_80130500 = false;
+    u32 bufAdjusted = (u32)buf;
+    s32 status;
+
+    if (D_80130500) {
+        bufAdjusted = (u32)buf - 0x2000;
+    }
+    if ((((u32)buf + size) & 0x1FFF) == 0) {
+        D_80130500 = true;
+    } else {
+        D_80130500 = false;
+    }
+
+    status = HW_REG(AI_STATUS_REG, s32);
+    if (status & AI_STATUS_AI_FULL) {
+        return -1;
+    }
+
+    HW_REG(AI_DRAM_ADDR_REG, u32) = PHYSICAL_TO_VIRTUAL(bufAdjusted);
+    HW_REG(AI_LEN_REG, u32) = size;
+    return 0;
+}