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authorThomas Martitz <kugel@rockbox.org>2012-01-04 18:07:21 +0100
committerThomas Martitz <kugel@rockbox.org>2012-01-22 18:46:44 +0100
commit991ae1e39553172a7dd6cd8c634aebfce892e261 (patch)
tree672a4583af663def399c4fefdbad060605397fbc /firmware/asm/arm
parenteaa83bd64775b87e943d345e2810deed44408776 (diff)
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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.c94
-rw-r--r--firmware/asm/arm/thread.h36
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