Adapt changes from b9s/next

Makefile

@@ -23,7 +23,7 @@ dir_out := out
 
 ASFLAGS := -mcpu=arm946e-s
 CFLAGS := -Wall -Wextra $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
-LDFLAGS := -nostartfiles
+LDFLAGS := -nostartfiles -Wl,--nmagic
 
 objects = $(patsubst $(dir_source)/%.s, $(dir_build)/%.o, \
           $(patsubst $(dir_source)/%.c, $(dir_build)/%.o, \

arm11/Makefile

@@ -13,8 +13,8 @@ dir_build := build
 dir_out := ../$(dir_build)
 
 ASFLAGS := -mcpu=mpcore
-CFLAGS  := -Wall -Wextra -MMD -MP -mthumb -mthumb-interwork $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
+CFLAGS  := -Wall -Wextra -MMD -MP -marm $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
-LDFLAGS := -nostdlib -Wl,--nmagic
+LDFLAGS := -nostartfiles -Wl,--nmagic
 
 objects = $(patsubst $(dir_source)/%.s, $(dir_build)/%.o, \
           $(patsubst $(dir_source)/%.c, $(dir_build)/%.o, \

arm11/linker.ld

@@ -4,11 +4,12 @@ OUTPUT_ARCH(arm)
 ENTRY(_start)
 SECTIONS
 {
-    . = 0x1FFFE000;
+    . = 0x1FF80000;
 
     .text   : ALIGN(4) { *(.text.start) *(.text*); . = ALIGN(4); }
     .rodata : ALIGN(4) { *(.rodata*); . = ALIGN(4); }
     .data   : ALIGN(4) { *(.data*); . = ALIGN(8); *(.bss* COMMON); . = ALIGN(8); }
 
+    __stack_top__    = 0x1FFFF000;
     . = ALIGN(4);
 }

arm11/source/main.c

@@ -27,7 +27,10 @@
 #include "types.h"
 #include "memory.h"
 
-static volatile Arm11Operation *operation = (volatile Arm11Operation *)0x1FFFFFF0;
+void prepareForFirmlaunch(void);
+extern u32 prepareForFirmlaunchSize;
+
+extern volatile Arm11Operation operation;
 
 static void initScreensSequence(u32 brightnessLevel)
 {
@@ -160,23 +163,16 @@ static void deinitScreens(void)
     *(vu32 *)0x10202014 = 0;
 }
 
-static void prepareForFirmlaunch(void)
-{
-    *ARM11_CORE0_MAILBOX_ENTRYPOINT = 0;
-    while(*ARM11_CORE0_MAILBOX_ENTRYPOINT == 0);
-    ((void (*)(void))*ARM11_CORE0_MAILBOX_ENTRYPOINT)(); 
-}
-
 void main(void)
 {
-    *operation = NO_ARM11_OPERATION;
+    operation = ARM11_READY;
 
     while(true)
     {
-        switch(*operation)
+        switch(operation)
         {
-            case NO_ARM11_OPERATION:
+            case ARM11_READY:
-                break;
+                continue;
             case INIT_SCREENS_SEQUENCE:
                 initScreensSequence(*(vu32 *)ARM11_PARAMETERS_ADDRESS);
                 break;
@@ -196,12 +192,13 @@ void main(void)
                 deinitScreens();
                 break;
             case PREPARE_ARM11_FOR_FIRMLAUNCH:
-                memcpy((void *)0x1FFFFC00, (void *)prepareForFirmlaunch, 0x2C);
+                memcpy((void *)0x1FFFFC00, (void *)prepareForFirmlaunch, prepareForFirmlaunchSize);
-                *operation = NO_ARM11_OPERATION;
+                *(vu32 *)0x1FFFFFFC = 0;
+                operation = ARM11_READY;
                 ((void (*)(void))0x1FFFFC00)();
                 break;
         }
 
-        *operation = NO_ARM11_OPERATION;
+        operation = ARM11_READY;
     }
 }

arm11/source/start.s

@@ -21,7 +21,31 @@
 .section .text.start
 .align 4
 .global _start
+.type   _start, %function
 _start:
+b start
+
+.global operation
+operation:
+    .word 0
+
+start:
     cpsid aif
-    ldr sp, =0x1FFFE000
+    ldr sp, =__stack_top__
     b main
+
+.global prepareForFirmlaunch
+.type   prepareForFirmlaunch, %function
+prepareForFirmlaunch:
+    mov r0, #0x20000000
+
+    _wait_for_core0_entrypoint_loop:
+        ldr r1, [r0, #-4]   @ check if core0's entrypoint is 0
+        cmp r1, #0
+        beq _wait_for_core0_entrypoint_loop
+
+    bx r1                   @ jump to core0's entrypoint
+prepareForFirmlaunchEnd:
+
+.global prepareForFirmlaunchSize
+prepareForFirmlaunchSize: .word prepareForFirmlaunchEnd - prepareForFirmlaunch

arm11/source/types.h

@@ -40,8 +40,7 @@ typedef volatile u64 vu64;
 #define SCREEN_HEIGHT        240
 #define SCREEN_TOP_FBSIZE    (3 * SCREEN_TOP_WIDTH * SCREEN_HEIGHT)
 #define SCREEN_BOTTOM_FBSIZE (3 * SCREEN_BOTTOM_WIDTH * SCREEN_HEIGHT)
-#define ARM11_CORE0_MAILBOX_ENTRYPOINT ((vu32 *)0x1FFFFFFC)
+#define ARM11_PARAMETERS_ADDRESS  0x1FFFF000
-#define ARM11_PARAMETERS_ADDRESS       0x1FFFC000
 
 struct fb {
      u8 *top_left;
@@ -51,12 +50,12 @@ struct fb {
 
 typedef enum
 {
-    NO_ARM11_OPERATION = 0,
+    INIT_SCREENS_SEQUENCE = 0,
-    INIT_SCREENS_SEQUENCE,
     SETUP_FRAMEBUFFERS,
     CLEAR_SCREENS,
     SWAP_FRAMEBUFFERS,
     UPDATE_BRIGHTNESS,
     DEINIT_SCREENS,
     PREPARE_ARM11_FOR_FIRMLAUNCH,
+    ARM11_READY,
 } Arm11Operation;

loader/Makefile

@@ -13,8 +13,8 @@ dir_build := build
 dir_out := ../$(dir_build)
 
 ASFLAGS := -mcpu=arm946e-s
-CFLAGS  := -Wall -Wextra -mthumb $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
+CFLAGS  := -Wall -Wextra -marm $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
-LDFLAGS := -nostdlib
+LDFLAGS := -nostartfiles -Wl,--nmagic
 
 objects = $(patsubst $(dir_source)/%.s, $(dir_build)/%.o, \
           $(patsubst $(dir_source)/%.c, $(dir_build)/%.o, \

loader/source/firm.c

@@ -24,20 +24,15 @@
 #include "memory.h"
 #include "cache.h"
 
+void disableMpuAndJumpToEntrypoints(int argc, char **argv, void *arm11Entry, void *arm9Entry);
+
 void launchFirm(Firm *firm, int argc, char **argv)
 {
     //Copy FIRM sections to respective memory locations
     for(u32 sectionNum = 0; sectionNum < 4 && firm->section[sectionNum].size != 0; sectionNum++)
         memcpy(firm->section[sectionNum].address, (u8 *)firm + firm->section[sectionNum].offset, firm->section[sectionNum].size);
 
-    //Ensure that all memory transfers have completed and that the caches have been flushed
+    disableMpuAndJumpToEntrypoints(argc, argv, firm->arm9Entry, firm->arm11Entry);
-    flushCaches();
-
-    //Set ARM11 entrypoint
-    *(vu32 *)0x1FFFFFFC = (u32)firm->arm11Entry;
-
-    //Jump to ARM9 entrypoint. Also give it additional arguments it can dismiss
-    ((void (*)(int, char**, u32))firm->arm9Entry)(argc, argv, 0x0000BEEF);
 
     __builtin_unreachable();
 }

loader/source/main.c

@@ -24,17 +24,25 @@
 #include "cache.h"
 #include "firm.h"
 
-void main(int argc __attribute__((unused)), char **argv)
+void main(int argc, char **argv)
 {
-    Firm *firm = (Firm *)0x24000000;
+    Firm *firm = (Firm *)0x20001000;
+    struct fb fbs[2];
     char absPath[24 + 255];
 
+    if(argc == 2)
+    {
+        struct fb *fbsrc = (struct fb *)argv[1];
+        fbs[0] = fbsrc[0];
+        fbs[1] = fbsrc[1];
+    }
+
     u32 i;
     for(i = 0; i < sizeof(absPath) - 1 && argv[0][i] != 0; i++)
         absPath[i] = argv[0][i];
     absPath[i] = 0;
 
-    char *argvPassed[1] = {absPath};
+    char *argvPassed[2] = {absPath, (char *)&fbs};
 
-    launchFirm(firm, 1, argvPassed);
+    launchFirm(firm, argc, argvPassed);
 }

loader/source/start.s

@@ -18,9 +18,40 @@
 @   reasonable legal notices or author attributions in that material or in the Appropriate Legal
 @   Notices displayed by works containing it.
 
+.arm
+
 .section .text.start
 .align 4
 .global _start
 _start:
     ldr sp, =0x27ffe000
     b main
+
+.text
+.balign 4
+.global disableMpuAndJumpToEntrypoints
+.type   disableMpuAndJumpToEntrypoints, %function
+disableMpuAndJumpToEntrypoints:
+    mov r4, r0
+    mov r5, r1
+    mov r6, r2
+    mov r7, r3
+
+    bl flushCaches
+
+    @ Disable caches / MPU
+    mrc p15, 0, r0, c1, c0, 0  @ read control register
+    bic r0, #(1<<12)           @ - instruction cache disable
+    bic r0, #(1<<2)            @ - data cache disable
+    bic r0, #(1<<0)            @ - mpu disable
+    mcr p15, 0, r0, c1, c0, 0  @ write control register
+
+    @ Set the ARM11 entrypoint
+    mov r0, #0x20000000
+    str r7, [r0, #-4]
+
+    @ Jump to the ARM9 entrypoint
+    mov r0, r4
+    mov r1, r5
+    ldr r2, =0xBEEF
+    bx r6

loader/source/types.h

@@ -33,3 +33,9 @@ typedef volatile u8 vu8;
 typedef volatile u16 vu16;
 typedef volatile u32 vu32;
 typedef volatile u64 vu64;
+
+struct fb {
+     u8 *top_left;
+     u8 *top_right;
+     u8 *bottom;
+}  __attribute__((packed));

patches/reboot.s

@@ -7,7 +7,7 @@ fname_addr equ 0x27FFDF80
 low_tid_addr equ 0x27FFDFE0
 copy_launch_stub_addr equ 0x27FFE000
 
-firm_addr equ 0x24000000
+firm_addr equ 0x20001000
 firm_maxsize equ (copy_launch_stub_addr - 0x1000 - firm_addr)
 
 arm11_entrypoint_addr equ 0x1FFFFFFC

source/firm.c

@@ -443,6 +443,7 @@ bool checkFirmPayload(void)
            (section->address + section->size < section->address) || //Overflow check
            ((u32)section->address & 3) || (section->offset & 0x1FF) || (section->size & 0x1FF) || //Alignment check
            (overlaps((u32)section->address, (u32)section->address + section->size, 0x27FFE000 - 0x1000, 0x28000000)) ||
+           (overlaps((u32)section->address, (u32)section->address + section->size, 0x1FFFFC00, 0x20000000)) ||
            (overlaps((u32)section->address, (u32)section->address + section->size, (u32)firm + section->offset, (u32)firm + size)))
             return false;
 

source/fs.c

@@ -170,12 +170,10 @@ void loadPayload(u32 pressed, const char *payloadPath)
     else
         sprintf(absPath, "sdmc:/luma/%s", path);
 
-    char *argv[1] = {absPath};
+    char *argv[2] = {absPath, (char *)fbs};
     initScreens();
 
-    if((u8 *)firm + payloadSize < (u8 *)0x23FFFE00)
+    launchFirm((firm->reserved2[0] & 1) ? 2 : 1, argv);
-        memcpy((void *)0x23FFFE00, fbs, sizeof(fbs));
-    launchFirm(1, argv);
 }
 
 void payloadMenu(void)

source/screen.c

@@ -50,9 +50,9 @@ struct fb fbs[2];
 
 static void invokeArm11Function(Arm11Operation op)
 {
-    while(*operation != NO_ARM11_OPERATION);
+    while(*operation != ARM11_READY);
     *operation = op;
-    while(*operation != NO_ARM11_OPERATION);
+    while(*operation != ARM11_READY); 
 }
 
 void prepareArm11ForFirmlaunch(void)
@@ -125,5 +125,6 @@ void initScreens(void)
     }
 
     clearScreens(false);
+    clearScreens(true);
     swapFramebuffers(false);
 }

source/screen.h

@@ -33,7 +33,7 @@
 
 #define ARESCREENSINITIALIZED (PDN_GPU_CNT != 1)
 
-#define ARM11_PARAMETERS_ADDRESS 0x1FFFC000
+#define ARM11_PARAMETERS_ADDRESS 0x1FFFF000
 
 #define SCREEN_TOP_WIDTH     400
 #define SCREEN_BOTTOM_WIDTH  320
@@ -45,22 +45,21 @@ struct fb {
      u8 *top_left;
      u8 *top_right;
      u8 *bottom;
-}  __attribute__((packed)); //*const fbs = (volatile struct fb *)0x23FFFE00;
+}  __attribute__((packed));
-
-extern struct fb fbs[2];
 
 typedef enum
 {
-    NO_ARM11_OPERATION = 0,
+    INIT_SCREENS_SEQUENCE = 0,
-    INIT_SCREENS_SEQUENCE,
     SETUP_FRAMEBUFFERS,
     CLEAR_SCREENS,
     SWAP_FRAMEBUFFERS,
     UPDATE_BRIGHTNESS,
     DEINIT_SCREENS,
     PREPARE_ARM11_FOR_FIRMLAUNCH,
+    ARM11_READY,
 } Arm11Operation;
 
+extern struct fb fbs[2];
 extern CfgData configData;
 
 void prepareArm11ForFirmlaunch(void);