Added a working fat driver and did some loading attempts

boot/3ds/Makefile

@@ -0,0 +1,18 @@
+include ../../kernel.settings
+CC=$(PREFIX)gcc
+LD=$(PREFIX)ld
+SRCS = $(shell find . -name '*.[cS]')
+OBJS = $(addsuffix .o,$(basename $(SRCS)))
+ASFLAGS = 
+CFLAGS += -I. -fno-stack-protector -nostdinc -ffreestanding -std=c11 -fno-builtin -w -Werror -nostdlib -fpie
+LDFLAGS += -T loader.ld
+all: $(OBJS)
+	$(LD) $(LDFLAGS) -o loader.elf $(OBJS) -L$(HOME)/opt/lib/gcc/$(libpath)/6.1.0/ -lgcc
+	objcopy -O binary loader.elf loader.bin
+	rm loader.elf
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+	
+%.o: %.S
+	$(CC) $(ASFLAGS) -c -o $@ $^

boot/3ds/fatfs/ff.c

@@ -143,22 +143,22 @@ DWORD get_fattime (void) {
     return 0;
 }
 
-WCHAR ff_convert (  /* Converted character, Returns zero on error */
+/*WCHAR ff_convert (  /* Converted character, Returns zero on error *
-    WCHAR   src,    /* Character code to be converted */
+    WCHAR   src,    /* Character code to be converted *
-    UINT    dir     /* 0: Unicode to OEMCP, 1: OEMCP to Unicode */
+    UINT    dir     /* 0: Unicode to OEMCP, 1: OEMCP to Unicode *
 )
 {
     WCHAR c;
 
 
-    if (src < 0x80) {   /* ASCII */
+    if (src < 0x80) {   /* ASCII *
         c = src;
 
     } else {
-        if (dir) {      /* OEMCP to Unicode */
+        if (dir) {      /* OEMCP to Unicode *
             c = (src >= 0x100) ? 0 : Tbl[src - 0x80];
 
-        } else {        /* Unicode to OEMCP */
+        } else {        /* Unicode to OEMCP *
             for (c = 0; c < 0x80; c++) {
                 if (src == Tbl[c]) break;
             }
@@ -177,7 +177,7 @@ WCHAR ff_wtoupper(WCHAR chr)
     else
         return chr;
 }
-
+*/
 
 /*--------------------------------------------------------------------------
    Module Private Definitions

boot/3ds/loader.ld

@@ -0,0 +1,11 @@
+ENTRY(_start)
+SECTIONS
+{
+  . = 0x23F00000;
+  .text.start : { *(.text.start)}
+  .text : {*(.text)}
+  .data : {*(.data)}
+  .bss : {*(.bss COMMON)}
+  .rodata : {*(.rodata)}
+  . = ALIGN(4);
+}

boot/3ds/main.c

@@ -0,0 +1,65 @@
+#include "common.h"
+#include "sdmmc.h"
+#include "fatfs/ff.h"
+char *lfb=(char*)0x18300000;
+#define DIAGPXL(i) (lfb[6*(i)]=lfb[6*(i)+1]=lfb[6*(i)+2]=0xFF)
+/**
+ * \struct FIRM_sect
+ * \brief Contains one section of the FIRM format
+ */
+struct FIRM_sect {
+    unsigned int offset; //! Offset in file (bytes)
+    unsigned int physical; //! Physical address, where the section is copied to
+    unsigned int size; //! Size of section
+    unsigned int arm11; //! currently unused
+    unsigned char SHA256[0x20]; //! Currently unused
+}__attribute__((packed));
+/**
+ * \struct FIRM_header
+ * \brief Contains the first sector of every FIRM file.
+ */
+struct FIRM_header {
+    char magic[4]; //! Magic "FIRM" string (not-null terminated)
+    int version; //! Version. Currently 1
+    void(*entrypoint)(void**); //! Address where the processor jumps to after loading
+    void * arm11entry;
+    unsigned int reserved[0xC];
+    struct FIRM_sect sections[4]; //! The four internal sections
+    unsigned char RSA2048[0x100]; //! Currently unused
+}__attribute__((packed));
+/**
+ * \brief Module table for the kernel (Up to 1024 mods)
+ */
+void *arm9modtable[64];
+void *arm11modtable[64];
+struct FIRM_header hdr;
+void init() {
+    DIAGPXL(0);
+    FATFS fs;
+    FIL firm;
+    f_mount(&fs, "0:", 0);
+    if(f_open(&firm, "mtgos.firm", FA_READ | FA_OPEN_EXISTING) == FR_OK) {
+        DIAGPXL(1);
+        unsigned int br;
+        f_read(&firm, (void*)&hdr, sizeof(struct FIRM_header), &br);
+        DIAGPXL(2);
+        if((hdr.magic[0]!='F')||(hdr.magic[1]!='I')||(hdr.magic[2]!='R')||(hdr.magic[3]!='M'))
+            while(1);
+        DIAGPXL(3);
+        for(int i=0;i<4;i++) { //Load sections
+            if(hdr.sections[i].size==0)
+                continue;
+            f_lseek(&firm, hdr.sections[i].offset);
+            char oldval=*((char*)hdr.sections[i].physical);
+            f_read(&firm, (void*)hdr.sections[i].physical, hdr.sections[i].size, &br);
+            if(oldval!=*((char*)hdr.sections[i].physical))
+                DIAGPXL(i+4);
+            DIAGPXL(i+8);
+        }
+        DIAGPXL(12);
+    }
+    DIAGPXL(13);
+    arm9modtable[0]=0;
+    arm11modtable[0]=0;
+    for(;;);
+}

boot/3ds/start.S

@@ -0,0 +1,63 @@
+.section .text.start
+.align 4
+b _start
+.word 0,0
+.global _start
+.extern main
+_start:
+    mov sp, #0x28000000
+    //Disable caches/mpu
+    mrc p15, 0, r0, c1, c0, 0
+    bic r0, #0x1000 //Disable instruction cache
+    bic r0, #0x4 //Disable data cache
+    bic r0, #0x1 //Disable MPU
+    mcr p15, 0, r0, c1, c0, 0
+    ldr r0, =0x33333333
+    mcr p15, 0, r0, c5, c0, 2 //Write data access
+    mcr p15, 0, r0, c5, c0, 3 //Write instruction access
+    // Sets MPU permissions and cache settings
+    ldr r0, =0xFFFF001D // ffff0000 32k  | bootrom (unprotected part)
+    ldr r1, =0x3000801B // fff00000 16k  | dtcm
+    ldr r2, =0x01FF801D // 01ff8000 32k  | itcm
+    ldr r3, =0x08000029 // 08000000 2M   | arm9 mem (O3DS / N3DS)
+    ldr r4, =0x10000029 // 10000000 2M   | io mem (ARM9 / first 2MB)
+    ldr r5, =0x20000037 // 20000000 256M | fcram (O3DS / N3DS)
+    ldr r6, =0x1FF00027 // 1FF00000 1M   | dsp / axi wram
+    ldr r7, =0x1800002D // 18000000 8M   | vram (+ 2MB)
+    mov r8, #0x29
+    mcr p15, 0, r0, c6, c0, 0
+    mcr p15, 0, r1, c6, c1, 0
+    mcr p15, 0, r2, c6, c2, 0
+    mcr p15, 0, r3, c6, c3, 0
+    mcr p15, 0, r4, c6, c4, 0
+    mcr p15, 0, r5, c6, c5, 0
+    mcr p15, 0, r6, c6, c6, 0
+    mcr p15, 0, r7, c6, c7, 0
+    mcr p15, 0, r8, c3, c0, 0   // Write bufferable 0, 3, 5
+    mcr p15, 0, r8, c2, c0, 0   // Data cacheable 0, 3, 5
+    mcr p15, 0, r8, c2, c0, 1   // Inst cacheable 0, 3, 5
+    // Enable dctm
+    ldr r0, =0x3000800A        // set dtcm
+    mcr p15, 0, r0, c9, c1, 0  // set the dtcm Region Register
+    
+    // Enable caches
+    mrc p15, 0, r0, c1, c0, 0  // read control register
+    orr r0, r0, #(1<<18)       // - itcm enable
+    orr r0, r0, #(1<<16)       // - dtcm enable
+    //orr r0, r0, #(1<<12)       // - instruction cache enable
+    //orr r0, r0, #(1<<2)        // - data cache enable
+    orr r0, r0, #(1<<0)        // - mpu enable
+    mcr p15, 0, r0, c1, c0, 0  // write control register
+
+    // Flush caches
+    mov r0, #0
+    mcr p15, 0, r0, c7, c5, 0  // flush I-cache
+    mcr p15, 0, r0, c7, c6, 0  // flush D-cache
+    mcr p15, 0, r0, c7, c10, 4 // drain write buffer
+    
+    // Fixes mounting of SDMC
+    ldr r0, =0x10000020
+    mov r1, #0x340
+    str r1, [r0]
+    
+    b init

boot/x86/Makefile

@@ -3,7 +3,7 @@ CC=$(PREFIX)gcc
 LD=$(PREFIX)ld
 SRCS = $(shell find . -name '*.[cS]')
 OBJS = $(addsuffix .o,$(basename $(SRCS)))
-ASFLAGS = 
+ASFLAGS += 
 CFLAGS += -fno-stack-protector -nostdinc -ffreestanding -std=c11 -fno-builtin -w -Werror -nostdlib -fpie
 LDFLAGS += -T loader.ld
 all: $(OBJS)

boot/x86/loader.ld

@@ -3,12 +3,9 @@ SECTIONS
 {
         . = 0x100000;
         kernel_start = .;
-        .bootstrap : {
-            *(multiboot)
-            boot.S (.text)
-        }
         .text : {
-                *(EXCLUDE_FILE(*boot.S) .text)
+                *(multiboot)
+                *(.text)
         }
         .data : {
                 start_ctors = .;

do.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+gmake clean
+gmake loader.bin
+gmake -C kernel
+gmake -C kernel clean
+mv kernel/mtgos.elf .
+objcopy -O binary mtgos.elf mtgos.bin
+gmake -C kernel subvar=11
+objcopy -O binary kernel/mtgos.elf kernel/mtgos.bin
+firmlink -O 8000000  -O 1FF80000 -E $(nm mtgos.elf | egrep ' _start$' | awk '{print $1}') -e $(nm kernel/mtgos.elf | egrep ' _start$' | awk '{print $1}') -o mtgos.firm mtgos.bin kernel/mtgos.bin
+rm mtgos.bin kernel/mtgos.*
+sudo mount_msdosfs /dev/da3s1 mount
+sudo rm mount/{arm9loaderhax.bin,mtgos.firm}
+sudo mv loader.bin mount/arm9loaderhax.bin
+sudo mv mtgos.firm mount/mtgos.firm
+sudo umount mount
+echo "Remove SD card!"

firmlink

@@ -1,3 +1,4 @@
 #!/usr/bin/env bash
 echo Entry point: $(nm mtgos.elf | egrep ' _start$' | awk '{print $1}')
 firmlink -O 200000 -E $(nm mtgos.elf | egrep ' _start$' | awk '{print $1}') -o $1.firm $1.bin
+firmlink -O 1FF80000 -E $(nm mtgos.elf | egrep ' _start$' | awk '{print $1}') -o 3ds-$1.firm $1.bin

kernel.settings

@@ -1,4 +1,5 @@
-arch = x86_64
+arch = 3ds
+subvar = 9
 MODE = debug
 export PATH := $(HOME)/opt/bin:$(PATH)
 LDFLAGS =
@@ -16,17 +17,23 @@ else
     ifeq ($(arch),3ds)
       PREFIX = arm-none-eabi-
       libpath = arm-none-eabi
-      ARCHFLAGS = -m32
+      ifeq ($(subvar),9)
+        ARCHFLAGS = -mcpu=arm946e-s -march=armv5te -mlittle-endian
+      else
+        ARCHFLAGS = -mcpu=mpcore -mlittle-endian
+      endif
     endif
   endif
 endif
 
 ifeq ($(MODE),debug)
   CFLAGS := -g3 -DDEBUG
+  ASFLAGS := -g3 -DDEBUG
   CPPFLAGS := -g3 -DDEBUG
 else
   CFLAGS := -O2
   CPPFLAGS := -O2
 endif
+ASFLAGS += $(ARCHFLAGS)
 CFLAGS += $(ARCHFLAGS)
 CPPFLAGS += $(ARCHFLAGS)