diff options
author | Thomas Martitz <kugel@rockbox.org> | 2012-01-04 18:07:21 +0100 |
---|---|---|
committer | Thomas Martitz <kugel@rockbox.org> | 2012-01-22 18:46:44 +0100 |
commit | 991ae1e39553172a7dd6cd8c634aebfce892e261 (patch) | |
tree | 672a4583af663def399c4fefdbad060605397fbc /firmware/asm/arm | |
parent | eaa83bd64775b87e943d345e2810deed44408776 (diff) | |
download | rockbox-991ae1e39553172a7dd6cd8c634aebfce892e261.tar.gz rockbox-991ae1e39553172a7dd6cd8c634aebfce892e261.zip |
Create fimrware/asm directory for assembly optimized stuff.
This dir is suitable for stuff that doesn't fit the target tree, e.g. because
it also builds on hosted or otherwise. It also has a generic subfolder for
fallback C implementations so that not all archs need to provide asm files.
SOURCES should only contain "foo.c" where foo.c includes the specific
<arch>/foo.c files from the subdirs using the preprocessor. This way automatic
selection of asm versions or generic C verion is possible.
For the start, the thread support files are moved, since ASM threads can
be used on hosted platforms as well. Since core_sleep() remains platform
specific it's moved to the corresponding system.h headers.
Change-Id: Iebff272f3407a6eaafeb7656ceb0ae9eca3f7cb9
Diffstat (limited to 'firmware/asm/arm')
-rw-r--r-- | firmware/asm/arm/thread.c | 94 | ||||
-rw-r--r-- | firmware/asm/arm/thread.h | 36 |
2 files changed, 130 insertions, 0 deletions
diff --git a/firmware/asm/arm/thread.c b/firmware/asm/arm/thread.c new file mode 100644 index 0000000000..fd443f2873 --- /dev/null +++ b/firmware/asm/arm/thread.c @@ -0,0 +1,94 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2005 by Thom Johansen + * + * Generic ARM threading support + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/*--------------------------------------------------------------------------- + * Start the thread running and terminate it if it returns + *--------------------------------------------------------------------------- + */ +static void __attribute__((naked)) USED_ATTR start_thread(void) +{ + /* r0 = context */ + asm volatile ( + "ldr sp, [r0, #32] \n" /* Load initial sp */ + "ldr r4, [r0, #40] \n" /* start in r4 since it's non-volatile */ + "mov r1, #0 \n" /* Mark thread as running */ + "str r1, [r0, #40] \n" +#if NUM_CORES > 1 + "ldr r0, =commit_discard_idcache \n" /* Invalidate this core's cache. */ + "mov lr, pc \n" /* This could be the first entry into */ + "bx r0 \n" /* plugin or codec code for this core. */ +#endif + "mov lr, pc \n" /* Call thread function */ + "bx r4 \n" + ); /* No clobber list - new thread doesn't care */ + thread_exit(); +#if 0 + asm volatile (".ltorg"); /* Dump constant pool */ +#endif +} + +/* For startup, place context pointer in r4 slot, start_thread pointer in r5 + * slot, and thread function pointer in context.start. See load_context for + * what happens when thread is initially going to run. */ +#define THREAD_STARTUP_INIT(core, thread, function) \ + ({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \ + (thread)->context.r[1] = (uint32_t)start_thread, \ + (thread)->context.start = (uint32_t)function; }) + + +/*--------------------------------------------------------------------------- + * Store non-volatile context. + *--------------------------------------------------------------------------- + */ +static inline void store_context(void* addr) +{ + asm volatile( + "stmia %0, { r4-r11, sp, lr } \n" + : : "r" (addr) + ); +} + +/*--------------------------------------------------------------------------- + * Load non-volatile context. + *--------------------------------------------------------------------------- + */ +static inline void load_context(const void* addr) +{ + asm volatile( + "ldr r0, [%0, #40] \n" /* Load start pointer */ + "cmp r0, #0 \n" /* Check for NULL */ + + /* If not already running, jump to start */ +#if ARM_ARCH == 4 && defined(USE_THUMB) + "ldmneia %0, { r0, r12 } \n" + "bxne r12 \n" +#else + "ldmneia %0, { r0, pc } \n" +#endif + + "ldmia %0, { r4-r11, sp, lr } \n" /* Load regs r4 to r14 from context */ + : : "r" (addr) : "r0" /* only! */ + ); +} + + diff --git a/firmware/asm/arm/thread.h b/firmware/asm/arm/thread.h new file mode 100644 index 0000000000..ec9bbcb3cd --- /dev/null +++ b/firmware/asm/arm/thread.h @@ -0,0 +1,36 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2002 by Ulf Ralberg + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +#include "config.h" + +struct regs +{ + uint32_t r[8]; /* 0-28 - Registers r4-r11 */ + uint32_t sp; /* 32 - Stack pointer (r13) */ + uint32_t lr; /* 36 - r14 (lr) */ + uint32_t start; /* 40 - Thread start address, or NULL when started */ +}; + +#if (CONFIG_PLATFORM & PLATFORM_HOSTED) + #define DEFAULT_STACK_SIZE 0x1000 /* Bytes */ +#else + #define DEFAULT_STACK_SIZE 0x400 /* Bytes */ +#endif |