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-rw-r--r--firmware/target/arm/crt0-pp-bl.S179
-rw-r--r--firmware/target/arm/crt0-pp.S135
2 files changed, 208 insertions, 106 deletions
diff --git a/firmware/target/arm/crt0-pp-bl.S b/firmware/target/arm/crt0-pp-bl.S
new file mode 100644
index 0000000000..4f50cac699
--- /dev/null
+++ b/firmware/target/arm/crt0-pp-bl.S
@@ -0,0 +1,179 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+ .section .init.text,"ax",%progbits
+
+ .global start
+start:
+
+/* PortalPlayer bootloader and startup code based on startup.s from the iPodLinux
+ * loader
+ *
+ * Copyright (c) 2003, Daniel Palffy (dpalffy (at) rainstorm.org)
+ * Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
+ *
+ */
+#if CONFIG_CPU == PP5002
+ .equ PROC_ID, 0xc4000000
+ .equ COP_CTRL, 0xcf004058
+ .equ COP_STATUS, 0xcf004050
+ .equ IIS_CONFIG, 0xc0002500
+ .equ SLEEP, 0xca
+ .equ WAKE, 0xce
+ .equ SLEEPING, 0x4000
+#else
+ .equ PROC_ID, 0x60000000
+ .equ COP_CTRL, 0x60007004
+ .equ COP_STATUS, 0x60007004
+ .equ IIS_CONFIG, 0x70002800
+ .equ SLEEP, 0x80000000
+ .equ WAKE, 0x0
+ .equ SLEEPING, 0x80000000
+ .equ CACHE_CTRL, 0x6000c000
+#endif
+
+ msr cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ */
+
+/* 1 - Copy the bootloader to IRAM */
+ /* get the high part of our execute address */
+ ldr r7, =0xffffff00
+ and r4, pc, r7
+
+ /* Copy bootloader to safe area - 0x40000000 (IRAM) */
+ mov r5, #0x40000000
+ ldr r6, = _dataend
+1:
+ cmp r5, r6
+ ldrcc r2, [r4], #4
+ strcc r2, [r5], #4
+ bcc 1b
+
+#ifndef IPOD_ARCH
+ /* For builds on targets with mi4 firmware, scramble writes data to
+ 0xe0-0xeb, so jump past that.*/
+ b pad_skip
+
+.space 60*4
+
+pad_skip:
+#endif
+
+
+/* 2 - Jump both CPU and COP there */
+ ldr pc, =start_loc /* jump to the relocated start_loc: */
+
+start_loc:
+
+ /* Find out which processor we are */
+ ldr r0, =PROC_ID
+ ldr r0, [r0]
+ and r0, r0, #0xff
+ cmp r0, #0x55
+ beq cpu
+
+ /* put us (co-processor) to sleep */
+ ldr r4, =COP_CTRL
+ mov r3, #SLEEP
+ str r3, [r4]
+ ldr pc, =cop_wake_start
+
+cop_wake_start:
+#if CONFIG_CPU != PP5002
+ /* COP: Invalidate cache */
+ ldr r0, =0xf000f044
+ ldr r1, [r0]
+ orr r1, r1, #0x6
+ str r1, [r0]
+
+ ldr r0, =CACHE_CTRL
+1:
+ ldr r1, [r0]
+ tst r1, #0x8000
+ bne 1b
+#endif
+
+ ldr r0, =startup_loc
+ ldr pc, [r0]
+
+cpu:
+ /* Wait for COP to be sleeping */
+ ldr r4, =COP_STATUS
+1:
+ ldr r3, [r4]
+ ands r3, r3, #SLEEPING
+ beq 1b
+
+ /* Initialise bss section to zero */
+ ldr r2, =_edata
+ ldr r3, =_end
+ mov r4, #0
+1:
+ cmp r3, r2
+ strhi r4, [r2], #4
+ bhi 1b
+
+ /* Set up some stack and munge it with 0xdeadbeef */
+ ldr sp, =stackend
+ mov r3, sp
+ ldr r2, =stackbegin
+ ldr r4, =0xdeadbeef
+1:
+ cmp r3, r2
+ strhi r4, [r2], #4
+ bhi 1b
+
+ /* execute the loader - this will load an image to 0x10000000 */
+ bl main
+
+ ldr r1, =startup_loc
+ str r0, [r1]
+
+#if CONFIG_CPU != PP5002
+ /* Flush cache */
+ ldr r3, =0xf000f044
+ ldr r4, [r3]
+ orr r4, r4, #0x2
+ str r4, [r3]
+
+ ldr r3, =CACHE_CTRL
+1:
+ ldr r4, [r3]
+ tst r4, #0x8000
+ bne 1b
+#endif
+
+ /* Wake up the coprocessor before executing the firmware */
+ ldr r4, =COP_CTRL
+ mov r3, #WAKE
+ str r3, [r4]
+
+ mov pc, r0
+
+startup_loc:
+ .word 0x0
+
+#ifdef IPOD_ARCH
+.align 8 /* starts at 0x100 */
+.global boot_table
+boot_table:
+ /* here comes the boot table, don't move its offset */
+ .space 400
+#endif
diff --git a/firmware/target/arm/crt0-pp.S b/firmware/target/arm/crt0-pp.S
index 17b1e8a4a3..892275e411 100644
--- a/firmware/target/arm/crt0-pp.S
+++ b/firmware/target/arm/crt0-pp.S
@@ -52,15 +52,9 @@ start:
msr cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ */
-#ifndef BOOTLOADER
b pad_skip
-#if defined(SANSA_E200)
-/* mi4tool writes junk between 0xe0 and 0xeb. Avoid this. */
-.space 60*4 /* (more than enough) space for exception vectors */
-#else
-.space 50*4
-#endif
+.space 50*4 /* (more than enough) space for exception vectors */
pad_skip:
#ifdef SANSA_E200
@@ -108,11 +102,13 @@ remap_end:
/* After doing the remapping, send the COP to sleep.
On wakeup it will go to cop_init */
+
+ /* Find out which processor we are */
ldr r0, =PROC_ID
ldr r0, [r0]
and r0, r0, #0xff
cmp r0, #0x55
- beq 1f
+ beq cpu_init
/* put us (co-processor) to sleep */
ldr r4, =COP_CTRL
@@ -121,9 +117,15 @@ remap_end:
ldr pc, =cop_init
-1:
-#ifndef DEBUG
+cpu_init:
+ /* Wait for COP to be sleeping */
+ ldr r4, =COP_STATUS
+1:
+ ldr r3, [r4]
+ ands r3, r3, #SLEEPING
+ beq 1b
+
/* Copy exception handler code to address 0 */
ldr r2, =_vectorsstart
ldr r3, =_vectorsend
@@ -133,15 +135,7 @@ remap_end:
ldrhi r5, [r4], #4
strhi r5, [r2], #4
bhi 1b
-#else
- ldr r1, =vectors
- ldr r0, =irq_handler
- str r0, [r1, #24]
- ldr r0, =fiq_handler
- str r0, [r1, #28]
-#endif
-#ifndef STUB
/* Zero out IBSS */
ldr r2, =_iedata
ldr r3, =_iend
@@ -160,8 +154,6 @@ remap_end:
ldrhi r5, [r2], #4
strhi r5, [r3], #4
bhi 1b
-#endif /* !STUB */
-#endif /* !BOOTLOADER */
/* Initialise bss section to zero */
ldr r2, =_edata
@@ -181,90 +173,6 @@ remap_end:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
-
-#ifdef BOOTLOADER
- /* TODO: the high part of the address is probably dependent on CONFIG_CPU.
- Since we tend to use ifdefs for each chipset target
- anyway, we might as well just hardcode it here.
- */
-
- /* get the high part of our execute address */
- ldr r0, =0xff000000
- and r8, pc, r0 @ r8 is used later
-
- /* Find out which processor we are */
- mov r0, #PROC_ID
- ldr r0, [r0]
- and r0, r0, #0xff
- cmp r0, #0x55
- beq 1f
-
- /* put us (co-processor) to sleep */
- ldr r4, =COP_CTRL
- mov r3, #SLEEP
- str r3, [r4]
- ldr pc, =cop_wake_start
-
-cop_wake_start:
- /* jump the COP to startup */
- ldr r0, =startup_loc
- ldr pc, [r0]
-
-1:
-
- /* get the high part of our execute address */
- ldr r2, =0xffffff00
- and r4, pc, r2
-
- /* Copy bootloader to safe area - 0x40000000 */
- mov r5, #0x40000000
- ldr r6, = _dataend
- sub r0, r6, r5 /* length of loader */
- add r0, r4, r0 /* r0 points to start of loader */
-1:
- cmp r5, r6
- ldrcc r2, [r4], #4
- strcc r2, [r5], #4
- bcc 1b
-
- ldr pc, =start_loc /* jump to the relocated start_loc: */
-
-start_loc:
-
- /* execute the loader - this will load an image to 0x10000000 */
- bl main
-
- /* Wake up the coprocessor before executing the firmware */
-
- /* save the startup address for the COP */
- ldr r1, =startup_loc
- str r0, [r1]
-
- /* make sure COP is sleeping */
- ldr r4, =COP_STATUS
-1:
- ldr r3, [r4]
- ands r3, r3, #SLEEPING
- beq 1b
-
- /* wake up COP */
- ldr r4, =COP_CTRL
- mov r3, #WAKE
- str r3, [r4]
-
- /* jump to start location */
- mov pc, r0
-
-startup_loc:
- .word 0x0
-
-.align 8 /* starts at 0x100 */
-.global boot_table
-boot_table:
- /* here comes the boot table, don't move its offset */
- .space 400
-
-#else /* BOOTLOADER */
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
@@ -290,6 +198,21 @@ boot_table:
/* main() should never return */
cop_init:
+#if CONFIG_CPU != PP5002
+ /* COP: Invalidate cache */
+ ldr r0, =0xf000f044
+ ldr r1, [r0]
+ orr r1, r1, #0x6
+ str r1, [r0]
+
+ ldr r0, =0x6000c000
+1:
+ ldr r1, [r0]
+ tst r1, #0x8000
+ bne 1b
+#endif
+
+ /* Setup stack for COP */
ldr sp, =cop_stackend
mov r3, sp
ldr r2, =cop_stackbegin
@@ -300,6 +223,8 @@ cop_init:
bhi 2b
ldr sp, =cop_stackend
+
+ /* Run cop_main() in apps/main.c */
bl cop_main
/* Exception handlers. Will be copied to address 0 after memory remapping */
@@ -385,5 +310,3 @@ irq_stack:
/* 256 words of FIQ stack */
.space 256*4
fiq_stack:
-
-#endif /* BOOTLOADER */