FS#10756 - Free unused init code

Introduce a new .init section for initialisation code, so that it can be copied to an area which is later overwritten before calling. The stack/bss can then overwrite that code, effectively freeing the code size that the initialisation routines need. Gives a few kB ram usage back.
Only implemented for PP and as3525 so far. More targets could be added, as well as more functions.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25013 a1c6a512-1295-4272-9138-f99709370657

33 files changed, 98 insertions, 37 deletions

diff --git a/apps/filetypes.h b/apps/filetypes.h
index 068ec3b..0b4fb7b 100644
--- a/apps/filetypes.h
+++ b/apps/filetypes.h
@@ -56,7 +56,7 @@ void tree_get_filetypes(const struct filetype**, int*);
 
 /* init the filetypes structs.
    uses audio buffer for storage, so call early in init... */
-void  filetype_init(void);
+void  filetype_init(void) INIT_ATTR;
 void read_viewer_theme_file(void);
 #ifdef HAVE_LCD_COLOR
 void read_color_theme_file(void);
diff --git a/apps/gui/statusbar-skinned.h b/apps/gui/statusbar-skinned.h
index 35bde0b..7558d5a 100644
--- a/apps/gui/statusbar-skinned.h
+++ b/apps/gui/statusbar-skinned.h
@@ -35,7 +35,7 @@
 void sb_skin_data_load(enum screen_type screen, const char *buf, bool isfile);
 
 void sb_create_from_settings(enum screen_type screen);
-void sb_skin_init(void);
+void sb_skin_init(void) INIT_ATTR;
 struct viewport *sb_skin_get_info_vp(enum screen_type screen);
 void sb_skin_update(enum screen_type screen, bool force);
 
diff --git a/apps/gui/statusbar.h b/apps/gui/statusbar.h
index 8a938d1..0233b56 100644
--- a/apps/gui/statusbar.h
+++ b/apps/gui/statusbar.h
@@ -100,7 +100,7 @@ struct gui_syncstatusbar
     struct gui_statusbar statusbars[NB_SCREENS];
 };
 
-extern void gui_syncstatusbar_init(struct gui_syncstatusbar * bars);
+extern void gui_syncstatusbar_init(struct gui_syncstatusbar * bars) INIT_ATTR;
 extern void gui_syncstatusbar_draw(struct gui_syncstatusbar * bars,
                                     bool force_redraw);
 void gui_statusbar_changed(enum screen_type screen,
diff --git a/apps/gui/viewport.h b/apps/gui/viewport.h
index fffd2fe..6a4dd02 100644
--- a/apps/gui/viewport.h
+++ b/apps/gui/viewport.h
@@ -42,8 +42,7 @@ int viewport_get_nb_lines(const struct viewport *vp);
  * Initialize the viewportmanager, which in turns initializes the UI vp and
  * statusbar stuff
  */
-void viewportmanager_init(void);
-
+void viewportmanager_init(void) INIT_ATTR;
 
 void viewport_set_defaults(struct viewport *vp,
                             const enum screen_type screen);
diff --git a/apps/gui/wps.h b/apps/gui/wps.h
index 0aa4967..50fb891 100644
--- a/apps/gui/wps.h
+++ b/apps/gui/wps.h
@@ -28,7 +28,7 @@ long gui_wps_show(void);
 /* wrapper for the wps to load the skin (.wps/.rwps) files */
 void wps_data_load(enum screen_type, const char *, bool);
 
-void gui_sync_wps_init(void);
+void gui_sync_wps_init(void) INIT_ATTR;
 
 /* fades the volume, e.g. on pause or stop */
 void fade(bool fade_in, bool updatewps);
diff --git a/apps/main.c b/apps/main.c
index 187f0cd..f0bd84c 100644
--- a/apps/main.c
+++ b/apps/main.c
@@ -127,7 +127,7 @@ static void init(void);
 #ifdef SIMULATOR
 void app_main(void)
 #else
-int main(void) __attribute__((noreturn));
+int main(void)  INIT_ATTR __attribute__((noreturn));
 int main(void)
 #endif
 {
@@ -164,6 +164,7 @@ int main(void)
     root_menu();
 }
 
+static int init_dircache(bool preinit) INIT_ATTR;
 static int init_dircache(bool preinit)
 {
 #ifdef HAVE_DIRCACHE
@@ -239,6 +240,7 @@ static int init_dircache(bool preinit)
 }
 
 #ifdef HAVE_TAGCACHE
+static void init_tagcache(void) INIT_ATTR;
 static void init_tagcache(void)
 {
     bool clear = false;
@@ -372,6 +374,7 @@ static void init(void)
 
 #else
 
+static void init(void) INIT_ATTR;
 static void init(void)
 {
     int rc;
diff --git a/apps/playlist.h b/apps/playlist.h
index 638e394..331d2f9 100644
--- a/apps/playlist.h
+++ b/apps/playlist.h
@@ -119,7 +119,7 @@ struct playlist_track_info
 };
 
 /* Exported functions only for current playlist. */
-void playlist_init(void);
+void playlist_init(void) INIT_ATTR;
 void playlist_shutdown(void);
 int playlist_create(const char *dir, const char *file);
 int playlist_resume(void);
diff --git a/apps/recorder/radio.h b/apps/recorder/radio.h
index 7277b46..129d1dd 100644
--- a/apps/recorder/radio.h
+++ b/apps/recorder/radio.h
@@ -27,7 +27,7 @@
 
 #if CONFIG_TUNER
 void radio_load_presets(char *filename);
-void radio_init(void);
+void radio_init(void) INIT_ATTR;
 int radio_screen(void);
 void radio_start(void);
 void radio_pause(void);
diff --git a/apps/tagcache.h b/apps/tagcache.h
index f238bc0..1488c3b 100644
--- a/apps/tagcache.h
+++ b/apps/tagcache.h
@@ -239,7 +239,7 @@ bool tagcache_is_ramcache(void);
 bool tagcache_fill_tags(struct mp3entry *id3, const char *filename);
 void tagcache_unload_ramcache(void);
 #endif
-void tagcache_init(void);
+void tagcache_init(void) INIT_ATTR;
 bool tagcache_is_initialized(void);
 bool tagcache_is_usable(void);
 void tagcache_start_scan(void);
diff --git a/apps/tagtree.h b/apps/tagtree.h
index a08c743..aaf5158 100644
--- a/apps/tagtree.h
+++ b/apps/tagtree.h
@@ -38,7 +38,7 @@ struct tagentry {
 
 bool tagtree_export(void);
 bool tagtree_import(void);
-void tagtree_init(void);
+void tagtree_init(void) INIT_ATTR;
 int tagtree_enter(struct tree_context* c);
 void tagtree_exit(struct tree_context* c);
 int tagtree_load(struct tree_context* c);
diff --git a/apps/tdspeed.h b/apps/tdspeed.h
index 715963a..c3b7fc4 100644
--- a/apps/tdspeed.h
+++ b/apps/tdspeed.h
@@ -36,7 +36,7 @@
 #define GET_STRETCH(pitch, speed) \
     ((speed * PITCH_SPEED_100 + pitch   / 2L) / pitch)
 
-void tdspeed_init(void);
+void tdspeed_init(void) INIT_ATTR;
 bool tdspeed_config(int samplerate, bool stereo, int32_t factor);
 long tdspeed_est_output_size(void);
 long tdspeed_est_input_size(long size);
diff --git a/apps/tree.h b/apps/tree.h
index 3b31d02..f3057e8 100644
--- a/apps/tree.h
+++ b/apps/tree.h
@@ -71,8 +71,8 @@ struct tree_context {
 };
 
 void tree_drawlists(void);
-void tree_mem_init(void);
-void tree_gui_init(void);
+void tree_mem_init(void) INIT_ATTR;
+void tree_gui_init(void) INIT_ATTR;
 void get_current_file(char* buffer, int buffer_len);
 void set_dirfilter(int l_dirfilter);
 void set_current_file(char *path);
diff --git a/firmware/export/adc.h b/firmware/export/adc.h
index 275db45..4a0d384 100644
--- a/firmware/export/adc.h
+++ b/firmware/export/adc.h
@@ -25,7 +25,7 @@
 #include "adc-target.h"
 
 unsigned short adc_read(int channel);
-void adc_init(void);
+void adc_init(void) INIT_ATTR;
 
 #ifndef NEED_ADC_CLOSE
 #define adc_close()
diff --git a/firmware/export/audio.h b/firmware/export/audio.h
index f6613df..0874d58 100644
--- a/firmware/export/audio.h
+++ b/firmware/export/audio.h
@@ -53,7 +53,7 @@
 #define AUDIO_GAIN_MIC          1
 
 
-void audio_init(void);
+void audio_init(void) INIT_ATTR;
 void audio_play(long offset);
 void audio_stop(void);
 void audio_pause(void);
diff --git a/firmware/export/backlight.h b/firmware/export/backlight.h
index c440db4..3b33e1a 100644
--- a/firmware/export/backlight.h
+++ b/firmware/export/backlight.h
@@ -36,7 +36,7 @@ void backlight_off(void);
 void backlight_set_timeout(int value);
 
 #ifdef HAVE_BACKLIGHT
-void backlight_init(void);
+void backlight_init(void) INIT_ATTR;
 void backlight_close(void);
 
 int  backlight_get_current_timeout(void);
diff --git a/firmware/export/buffer.h b/firmware/export/buffer.h
index 9a2b392..4c80471 100644
--- a/firmware/export/buffer.h
+++ b/firmware/export/buffer.h
@@ -21,6 +21,7 @@
 #ifndef BUFFER_H
 #define BUFFER_H
 
+#include "config.h"
 /* defined in linker script */
 #ifdef SIMULATOR
 extern unsigned char *audiobufend;
@@ -30,7 +31,7 @@ extern unsigned char audiobufend[];
 
 extern unsigned char *audiobuf;
 
-void buffer_init(void);
+void buffer_init(void) INIT_ATTR;
 void *buffer_alloc(size_t size);
 
 #endif
diff --git a/firmware/export/button.h b/firmware/export/button.h
index 3aac1af..097f50a 100644
--- a/firmware/export/button.h
+++ b/firmware/export/button.h
@@ -30,7 +30,7 @@
 
 extern struct event_queue button_queue;
 
-void button_init (void);
+void button_init (void) INIT_ATTR;
 void button_close(void);
 int button_queue_count(void);
 long button_get (bool block);
diff --git a/firmware/export/config.h b/firmware/export/config.h
index c7ddbfc..06003b4 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -747,6 +747,11 @@ Lyre prototype 1 */
 #define IBSS_ATTR
 #define STATICIRAM static
 #endif
+#if (defined(CPU_PP) || (CONFIG_CPU == AS3525)) && !defined(SIMULATOR)
+#define INIT_ATTR       __attribute__ ((section(".init")))
+#else
+#define INIT_ATTR
+#endif
 
 #if defined(SIMULATOR) && defined(__APPLE__)
 #define DATA_ATTR       __attribute__ ((section("__DATA, .data")))
diff --git a/firmware/export/font.h b/firmware/export/font.h
index 406901d..f6915d9 100644
--- a/firmware/export/font.h
+++ b/firmware/export/font.h
@@ -115,7 +115,7 @@ struct font {
 };
 
 /* font routines*/
-void font_init(void);
+void font_init(void) INIT_ATTR;
 #ifdef HAVE_REMOTE_LCD
 /* Load a font into the special remote ui font slot */
 int font_load_remoteui(const char* path);
diff --git a/firmware/export/kernel.h b/firmware/export/kernel.h
index a21b0b3..734235a 100644
--- a/firmware/export/kernel.h
+++ b/firmware/export/kernel.h
@@ -214,7 +214,7 @@ static inline void call_tick_tasks(void)
 #endif
 
 /* kernel functions */
-extern void kernel_init(void);
+extern void kernel_init(void) INIT_ATTR;
 extern void yield(void);
 extern void sleep(int ticks);
 int tick_add_task(void (*f)(void));
diff --git a/firmware/export/lcd.h b/firmware/export/lcd.h
index 5145e7c..3572090 100644
--- a/firmware/export/lcd.h
+++ b/firmware/export/lcd.h
@@ -175,8 +175,8 @@ extern void lcd_write_command(int byte);
 extern void lcd_write_command_e(int cmd, int data);
 extern void lcd_write_command_ex(int cmd, int data1, int data2);
 extern void lcd_write_data(const fb_data* p_bytes, int count);
-extern void lcd_init(void);
-extern void lcd_init_device(void);
+extern void lcd_init(void) INIT_ATTR;
+extern void lcd_init_device(void) INIT_ATTR;
 
 extern void lcd_backlight(bool on);
 extern int  lcd_default_contrast(void);
diff --git a/firmware/export/power.h b/firmware/export/power.h
index 5cd6996..1071587 100644
--- a/firmware/export/power.h
+++ b/firmware/export/power.h
@@ -83,7 +83,7 @@ bool charging_state(void);
 
 #ifndef SIMULATOR
 
-void power_init(void);
+void power_init(void) INIT_ATTR;
 
 bool ide_powered(void);
 #endif
diff --git a/firmware/export/powermgmt.h b/firmware/export/powermgmt.h
index c49cd0e..23ef447 100644
--- a/firmware/export/powermgmt.h
+++ b/firmware/export/powermgmt.h
@@ -131,7 +131,7 @@ extern const unsigned short percent_to_volt_charge[11];
 #endif
 
 /* Start up power management thread */
-void powermgmt_init(void);
+void powermgmt_init(void) INIT_ATTR;
 
 #endif /* SIMULATOR */
 
diff --git a/firmware/export/scroll_engine.h b/firmware/export/scroll_engine.h
index 16b11c2..ca94828 100644
--- a/firmware/export/scroll_engine.h
+++ b/firmware/export/scroll_engine.h
@@ -28,7 +28,7 @@
 #include <lcd.h>
 #include "file.h"
 
-void scroll_init(void);
+void scroll_init(void) INIT_ATTR;
 void lcd_scroll_stop(const struct viewport* vp);
 void lcd_scroll_stop_line(const struct viewport* vp, int y);
 void lcd_scroll_fn(void);
diff --git a/firmware/export/thread.h b/firmware/export/thread.h
index cd27324..2a2a7a8 100644
--- a/firmware/export/thread.h
+++ b/firmware/export/thread.h
@@ -479,7 +479,7 @@ void core_idle(void);
 void core_wake(IF_COP_VOID(unsigned int core));
 
 /* Initialize the scheduler */
-void init_threads(void);
+void init_threads(void) INIT_ATTR;
 
 /* Allocate a thread in the scheduler */
 #define CREATE_THREAD_FROZEN   0x00000001 /* Thread is frozen at create time */
diff --git a/firmware/export/tuner.h b/firmware/export/tuner.h
index 6339216..cac0388 100644
--- a/firmware/export/tuner.h
+++ b/firmware/export/tuner.h
@@ -158,7 +158,7 @@ enum
 
 /** **/
 
-void tuner_init(void);
+void tuner_init(void) INIT_ATTR;
 
 #endif /* #if CONFIG_TUNER */
 
diff --git a/firmware/export/usb.h b/firmware/export/usb.h
index e725f0a..48400b1 100644
--- a/firmware/export/usb.h
+++ b/firmware/export/usb.h
@@ -132,7 +132,7 @@ struct usb_transfer_completion_event_data
 };
 #endif /* HAVE_USBSTACK */
 
-void usb_init(void);
+void usb_init(void) INIT_ATTR;
 void usb_enable(bool on);
 void usb_attach(void);
 void usb_start_monitoring(void);
diff --git a/firmware/include/dircache.h b/firmware/include/dircache.h
index 16382ed..9fd55fa 100644
--- a/firmware/include/dircache.h
+++ b/firmware/include/dircache.h
@@ -92,7 +92,7 @@ typedef struct {
     DIR_UNCACHED *regulardir;
 } DIR_CACHED;
 
-void dircache_init(void);
+void dircache_init(void) INIT_ATTR;
 int dircache_load(void);
 int dircache_save(void);
 int dircache_build(int last_size);
diff --git a/firmware/target/arm/as3525/app.lds b/firmware/target/arm/as3525/app.lds
index eb5b28f..6e610d6 100644
--- a/firmware/target/arm/as3525/app.lds
+++ b/firmware/target/arm/as3525/app.lds
@@ -99,6 +99,8 @@ SECTIONS
         _iramend = .;
     } > IRAM AT> DRAM
 
+    _iramcopy = LOADADDR(.iram);
+
     .ibss (NOLOAD) :
     {
         _iedata = .;
@@ -108,9 +110,17 @@ SECTIONS
         _iend = .;
     } > IRAM
 
-    _iramcopy = LOADADDR(.iram);
+    .init ENDAUDIOADDR : 
+    {
+        . = ALIGN(4);
+        _initstart = .;
+        *(.init)
+        _initend = .;
+    } AT> DRAM
+
+    _initcopy = LOADADDR(.init);
 
-    .stack (NOLOAD) :
+    .stack _iramcopy (NOLOAD) :
     {
        *(.stack)
        stackbegin = .;
diff --git a/firmware/target/arm/crt0-pp.S b/firmware/target/arm/crt0-pp.S
index 9c99696..4e16df0 100644
--- a/firmware/target/arm/crt0-pp.S
+++ b/firmware/target/arm/crt0-pp.S
@@ -213,6 +213,19 @@ cpu_init:
     strhi  r5, [r3], #4
     bhi    1b
 
+#ifdef INIT_ATTR
+    /* copy init code to codec buffer */
+    ldr    r2, =_initstart
+    ldr    r3, =_initend
+    ldr    r4, =_initcopy
+
+1:
+    cmp     r3, r2
+    ldrhi   r5, [r4], #4
+    strhi   r5, [r2], #4
+    bhi 1b
+#endif
+
     /* Zero out IBSS */
     ldr    r2, =_iedata
     ldr    r3, =_iend
diff --git a/firmware/target/arm/crt0.S b/firmware/target/arm/crt0.S
index 238cfdd..6284bcb 100644
--- a/firmware/target/arm/crt0.S
+++ b/firmware/target/arm/crt0.S
@@ -71,6 +71,7 @@ newstart:
     bhi     1b
 
     /* Copy the IRAM */
+    /* must be done before bss is zeroed */
     ldr     r2, =_iramcopy
     ldr     r3, =_iramstart
     ldr     r4, =_iramend
@@ -79,6 +80,23 @@ newstart:
     ldrhi   r5, [r2], #4
     strhi   r5, [r3], #4
     bhi     1b
+
+#endif
+
+#ifdef INIT_ATTR
+    /* copy init data to codec buffer */
+    /* must be done before bss is zeroed */
+    ldr    r2, =_initcopy
+    ldr    r3, =_initstart
+    ldr    r4, =_initend
+1:
+    cmp     r4, r3
+    ldrhi   r5, [r2], #4
+    strhi   r5, [r3], #4
+    bhi     1b
+
+    mov     r2, #0
+    mcr     p15, 0, r2, c7, c5, 0   @ Invalidate ICache
 #endif
 
     /* Initialise bss section to zero */
@@ -89,7 +107,7 @@ newstart:
     cmp     r3, r2
     strhi   r4, [r2], #4
     bhi     1b
-    
+
     /* Set up some stack and munge it with 0xdeadbeef */
     ldr     sp, =stackend
     ldr     r2, =stackbegin
@@ -115,7 +133,6 @@ newstart:
 
     /* Switch back to supervisor mode */
     msr     cpsr_c, #0xd3
-
     bl      main
 
 
diff --git a/firmware/target/arm/sandisk/app.lds b/firmware/target/arm/sandisk/app.lds
index 3010644..ec26fdb 100644
--- a/firmware/target/arm/sandisk/app.lds
+++ b/firmware/target/arm/sandisk/app.lds
@@ -37,8 +37,8 @@ STARTUP(target/arm/crt0-pp.o)
 
 MEMORY
 {
-    DRAM : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE
-    IRAM : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
+    DRAM : ORIGIN = DRAMORIG,     LENGTH = DRAMSIZE
+    IRAM : ORIGIN = IRAMORIG,     LENGTH = IRAMSIZE
 }
 
 SECTIONS
@@ -126,6 +126,17 @@ SECTIONS
 
     _iramcopy = LOADADDR(.iram);
 
+
+    .init ENDAUDIOADDR : 
+    {
+        . = ALIGN(4);
+        _initstart = .;
+        *(.init)
+        _initend = .;
+    } AT> DRAM
+
+    _initcopy = LOADADDR(.init);
+
     .idle_stacks (NOLOAD) :
     {
        *(.idle_stacks)
@@ -175,6 +186,7 @@ SECTIONS
     .audiobuf (NOLOAD) :
     {
         _audiobuffer = .;
+        . = ALIGN(0x4);
         audiobuffer = .;
     } > DRAM
     
diff --git a/firmware/thread.c b/firmware/thread.c
index 6fa7073..38933f6 100644
--- a/firmware/thread.c
+++ b/firmware/thread.c
@@ -724,7 +724,8 @@ static void __attribute__((naked))
  * initializations.
  *---------------------------------------------------------------------------
  */
-static void core_thread_init(unsigned int core)
+static void core_thread_init(unsigned int core) INIT_ATTR;
+static void core_thread_init(unsigned int core) 
 {
     if (core == CPU)
     {