Add more OS functions

1 files changed, 194 insertions, 2 deletions

diff --git a/nitro/os.c b/nitro/os.c
index a531740d..3ecffb34 100644
--- a/nitro/os.c
+++ b/nitro/os.c
@@ -3,7 +3,199 @@
 //
 
 #include "os.h"
+#include "consts.h"
 
-asm void OS_GetProcMode() {
+OSProcMode OS_GetProcMode() {
+    __asm {
+        mrs r0, cpsr
+        and r0, r0, #HW_PSR_CPU_MODE_MASK
+        bx lr
+    }
+}
 
-}
\ No newline at end of file
+OSIntrMode OS_DisableInterrupts() {
+    __asm {
+        mrs     r0, cpsr
+        orr     r1, r0, #HW_PSR_IRQ_DISABLE
+        msr     cpsr_c, r1
+        and     r0, r0, #HW_PSR_IRQ_DISABLE
+        bx      lr
+    }
+}
+
+OSIntrMode OS_RestoreInterrupts(OSIntrMode state) {
+    __asm {
+        mrs     r1, cpsr
+        bic     r2, r1, #HW_PSR_IRQ_DISABLE
+        orr     r2, r2, r0
+        msr     cpsr_c, r2
+        and     r0, r1, #HW_PSR_IRQ_DISABLE
+        bx      lr
+    }
+}
+
+void* OS_AllocFromArenaLo(OSArenaId id, u32 size, u32 align) {
+#ifdef MATCH_ASM
+    __asm {
+        stmdb sp!,{ r4 r5 r6 r7 lr }
+        sub sp,sp,#0x4
+        mov r7,r0
+        mov r6,r1
+        mov r5,r2
+        bl OS_GetArenaLo
+        cmp r0,#0x0
+        addeq sp,sp,#0x4
+        moveq r0,#0x0
+        ldmeqia sp!,{ r4 r5 r6 r7 lr }
+        bxeq lr
+        add r0,r0,r5
+        sub r1,r5,#0x1
+        mvn r2,r1
+        sub r0,r0,#0x1
+        and r4,r2,r0
+        add r0,r4,r6
+        add r0,r0,r5
+        sub r1,r0,#0x1
+        mov r0,r7
+        and r5,r2,r1
+        bl OS_GetArenaHi
+        cmp r5,r0
+        addhi sp,sp,#0x4
+        movhi r0,#0x0
+        ldmhiia sp!,{ r4 r5 r6 r7 lr }
+        bxhi lr
+        mov r0,r7
+        mov r1,r5
+        bl OS_SetArenaLo
+        mov r0,r4
+        add sp,sp,#0x4
+        ldmia sp!,{ r4 r5 r6 r7 lr }
+        bx lr
+    }
+#else
+    void* ptr;
+    u8* arenaLo;
+    ptr = OS_GetArenaLo(id);
+    if (!ptr) {
+        return NULL;
+    }
+    arenaLo = ptr = (void *)OSi_ROUND(ptr, align);
+    arenaLo += size;
+    arenaLo = (u8 *)OSi_ROUND(arenaLo, align);
+    if (arenaLo > (u8*)OS_GetArenaHi(id)) {
+        return NULL;
+    }
+    OS_SetArenaLo(id, arenaLo);
+
+    return ptr;
+#endif
+}
+
+void* OS_AllocFromArenaHi(OSArenaId id, u32 size, u32 align) {
+#ifdef MATCH_ASM
+    __asm {
+         stmdb sp!,{ r4 r5 r6 lr }
+         mov r4,r0
+         mov r6,r1
+         mov r5,r2
+         bl OS_GetArenaHi
+         cmp r0,#0x0
+         moveq r0,#0x0
+         ldmeqia sp!,{ r4 r5 r6 lr }
+         bxeq lr
+         sub r1,r5,#0x1
+         mvn r2,r1
+         and r0,r0,r2
+         sub r1,r0,r6
+         mov r0,r4
+         and r5,r1,r2
+         bl OS_GetArenaLo
+         cmp r5,r0
+         movcc r0,#0x0
+         ldmccia sp!,{ r4 r5 r6 lr }
+         bxcc lr
+         mov r0,r4
+         mov r1,r5
+         bl OS_SetArenaHi
+         mov r0,r5
+         ldmia sp!,{ r4 r5 r6 lr }
+         bx lr
+    };
+#else
+    void* ptr;
+    u8* arenaHi;
+
+    arenaHi = OS_GetArenaHi(id);
+    if (!arenaHi) {
+        return NULL;
+    }
+
+    arenaHi = (u8 *)OSi_TRUNC(arenaHi, align);
+    arenaHi -= size;
+    arenaHi = ptr = (void *)OSi_TRUNC(arenaHi, align);
+
+    if (arenaHi < (u8*)OS_GetArenaLo(id)) {
+        return NULL;
+    }
+
+    OS_SetArenaHi(id, arenaHi);
+
+    return ptr;
+#endif
+}
+
+void OS_SetArenaHi(OSArenaId id, void *newHi) {
+#ifdef MATCH_ASM
+    __asm {
+        mov r0,r0, lsl #0x2
+        add r0,r0,#0x2700000
+        add r0,r0,#0xff000
+        str r1,[r0,#0xdc4]
+        bx lr
+    }
+#else
+    OSi_GetArenaInfo().lo[id] = newHi;
+#endif
+}
+
+void OS_SetArenaLo(OSArenaId id, void *newLo) {
+#ifdef MATCH_ASM
+    __asm {
+        mov r0,r0, lsl #0x2
+        add r0,r0,#0x2700000
+        add r0,r0,#0xff000
+        str r1,[r0,#0xda0]
+        bx lr
+    }
+#else
+    OSi_GetArenaInfo().lo[id] = newLo;
+#endif
+}
+
+void* OS_GetArenaHi(OSArenaId id) {
+#ifdef MATCH_ASM
+    __asm {
+        mov r0,r0, lsl #0x2
+        add r0,r0,#0x2700000
+        add r0,r0,#0xff000
+        ldr r0,[r0,#0xdc4]
+        bx lr
+    }
+#else
+    return OSi_GetArenaInfo().hi[id];
+#endif
+}
+
+void* OS_GetArenaLo(OSArenaId id) {
+#ifdef MATCH_ASM
+    __asm {
+        mov r0,r0, lsl #0x2
+        add r0,r0,#0x2700000
+        add r0,r0,#0xff000
+        ldr r0,[r0,#0xda0]
+        bx lr
+    }
+#else
+    return OSi_GetArenaInfo().lo[id];
+#endif
+}