diff options
Diffstat (limited to 'os')
| -rw-r--r-- | os/ports/GCC/AVR/port.dox | 2 | ||||
| -rw-r--r-- | os/ports/GCC/MSP430/port.dox | 2 | ||||
| -rw-r--r-- | os/ports/GCC/PPC/chcore.h | 6 | ||||
| -rw-r--r-- | os/ports/GCC/PPC/chtypes.h | 7 | ||||
| -rw-r--r-- | os/ports/GCC/PPC/crt0.s | 28 | ||||
| -rw-r--r-- | os/ports/GCC/PPC/port.dox | 128 |
6 files changed, 151 insertions, 22 deletions
diff --git a/os/ports/GCC/AVR/port.dox b/os/ports/GCC/AVR/port.dox index 664714366..508315656 100644 --- a/os/ports/GCC/AVR/port.dox +++ b/os/ports/GCC/AVR/port.dox @@ -63,7 +63,7 @@ * used by the interrupt handlers.<br>
* The default for this value is @p 32, this space is allocated for each
* thread so be careful in order to not waste precious RAM space.<br>
- * The default value is set into <b>./ports/AVR/chcore.h</b>.
+ * The default value is set into <b>./os/ports/GCC/AVR/chcore.h</b>.
* .
* @ingroup AVR
*/
diff --git a/os/ports/GCC/MSP430/port.dox b/os/ports/GCC/MSP430/port.dox index 4e8dca24c..09cff8a03 100644 --- a/os/ports/GCC/MSP430/port.dox +++ b/os/ports/GCC/MSP430/port.dox @@ -69,7 +69,7 @@ * used by the interrupt handlers.<br>
* The default for this value is @p 32, this space is allocated for each
* thread so be careful in order to not waste precious RAM space.<br>
- * The default value is set into <b>./ports/MSP430/chcore.h</b>.
+ * The default value is set into <b>./os/ports/GCC/MSP430/chcore.h</b>.
* .
* @ingroup MSP430
*/
diff --git a/os/ports/GCC/PPC/chcore.h b/os/ports/GCC/PPC/chcore.h index dc09c75f5..1351531f5 100644 --- a/os/ports/GCC/PPC/chcore.h +++ b/os/ports/GCC/PPC/chcore.h @@ -18,10 +18,10 @@ */
/**
- * @file PPCE200Z/chcore.h
- * @brief PowerPC E200Zx architecture port macros and structures.
+ * @file PPC/chcore.h
+ * @brief PowerPC architecture port macros and structures.
*
- * @addtogroup PPCE200Z_CORE
+ * @addtogroup PPC_CORE
* @{
*/
diff --git a/os/ports/GCC/PPC/chtypes.h b/os/ports/GCC/PPC/chtypes.h index ed380b457..e6eedbde0 100644 --- a/os/ports/GCC/PPC/chtypes.h +++ b/os/ports/GCC/PPC/chtypes.h @@ -18,9 +18,10 @@ */
/**
- * @file PPCE200Z/chtypes.h
- * @brief PPC E200Zx architecture port system types.
- * @addtogroup PPCE200Z_CORE
+ * @file PPC/chtypes.h
+ * @brief PowerPC architecture port system types.
+ *
+ * @addtogroup PPC_CORE
* @{
*/
diff --git a/os/ports/GCC/PPC/crt0.s b/os/ports/GCC/PPC/crt0.s index ee8d4c2ac..e12a87843 100644 --- a/os/ports/GCC/PPC/crt0.s +++ b/os/ports/GCC/PPC/crt0.s @@ -38,8 +38,20 @@ _boot_address: li %r0, 0
stwu %r0, -8(%r1)
/*
- * Early initialization.
- */
+ * IVPR initialization.
+ */
+ lis %r4, __ivpr_base__@h
+ mtIVPR %r4
+ /*
+ * Small sections registers initialization.
+ */
+ lis %r2, __sdata2_start__@h
+ ori %r2, %r2, __sdata2_start__@l
+ lis %r13, __sdata_start__@h
+ ori %r13, %r13, __sdata_start__@l
+ /*
+ * Early initialization.
+ */
bl hwinit0
/*
* BSS clearing.
@@ -75,18 +87,6 @@ _boot_address: b .dataloop
.dataend:
/*
- * Small sections registers initialization.
- */
- lis %r2, __sdata2_start__@h
- ori %r2, %r2, __sdata2_start__@l
- lis %r13, __sdata_start__@h
- ori %r13, %r13, __sdata_start__@l
- /*
- * IVPR initialization.
- */
- lis %r4, __ivpr_base__@h
- mtIVPR %r4
- /*
* Late initialization.
*/
bl hwinit1
diff --git a/os/ports/GCC/PPC/port.dox b/os/ports/GCC/PPC/port.dox new file mode 100644 index 000000000..cc09f3f82 --- /dev/null +++ b/os/ports/GCC/PPC/port.dox @@ -0,0 +1,128 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT 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 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @defgroup PPC PowerPC
+ * @details PowerPC port details. This section describes how the ChibiOS/RT
+ * features are implemented on this architecture.
+ *
+ * @section PPC_STATES Mapping of the System States in the PowerPC port
+ * The ChibiOS/RT logical @ref system_states are mapped as follow in the
+ * PowerPC port:
+ * - <b>Init</b>. This state is represented by the startup code and the
+ * initialization code before @p chSysInit() is executed. It has not a
+ * special hardware state associated.
+ * - <b>Normal</b>. This is the state the system has after executing
+ * @p chSysInit(). Interrupts are enabled.
+ * - <b>Suspended</b>. Interrupts are disabled.
+ * - <b>Disabled</b>. Interrupts are enabled. This state is equivalent to the
+ * Suspended state because there are no fast interrupts in this architecture.
+ * - <b>Sleep</b>. This state is entered with the execution of the specific
+ * instruction @p <b>wait</b>.
+ * - <b>S-Locked</b>. Interrupts are disabled.
+ * - <b>I-Locked</b>. This state is equivalent to the SRI state, the
+ * @p chSysLockI() and @p chSysUnlockI() APIs do nothing (still use them in
+ * order to formally change state because this may change).
+ * - <b>Serving Regular Interrupt</b>. Normal interrupt service code.
+ * - <b>Serving Fast Interrupt</b>. Not present in this architecture.
+ * - <b>Serving Non-Maskable Interrupt</b>. The PowerPC has several non
+ * maskable interrupt sources that can be associated to this state.
+ * - <b>Halted</b>. Implemented as an infinite loop with interrupts disabled.
+ * .
+ * @section PPC_NOTES The PowerPC port notes
+ * The PowerPC port is organized as follow:
+ * - The @p main() function is invoked in privileged mode.
+ * - Each thread has a private stack with extra storage for interrupts
+ * servicing.
+ * - The Book-E Decrementer Timer, mapped on IVOR10, is used for system tick.
+ * - Interrupt nesting is not currently supported.
+ * .
+ * @ingroup ports
+ */
+
+/**
+ * @defgroup PPC_CONF Configuration Options
+ * @brief PowerPC Configuration Options.
+ * @details The PowerPC port allows some architecture-specific configurations
+ * settings that can be specified externally, as example on the compiler
+ * command line:
+ * - @p INT_REQUIRED_STACK, this value represent the amount of stack space used
+ * by an interrupt handler between the @p extctx and @p intctx
+ * structures.
+ * The default for this value is @p 128 bytes, this space is allocated for
+ * each thread so be careful in order to not waste precious RAM space.<br>
+ * The default value is set into <b>./os/ports/GCC/PPC/chcore.h</b>.
+ * - @p ENABLE_WFI_IDLE, if set to @p TRUE enables the use of the @p <b>wait</b>
+ * instruction from within the idle loop. This is defaulted to 0 because
+ * it can create problems with some debuggers. Setting this option to 1
+ * reduces the system power requirements.
+ * .
+ * @ingroup PPC
+ */
+
+/**
+ * @defgroup PPC_CORE Core Port Implementation
+ * @brief PowerPC specific port code, structures and macros.
+ *
+ * @ingroup PPC
+ */
+
+/**
+ * @defgroup PPC_STARTUP Startup Support
+ * @brief PPC startup code support.
+ * @details ChibiOS/RT provides its own generic startup file for the PowerPC
+ * port.
+ * Of course it is not mandatory to use it but care should be taken about the
+ * startup phase details.
+ *
+ * <h2>Startup Process</h2>
+ * The startup process, as implemented, is the following:
+ * -# The stacks pointer is initialized into the area defined in the linker
+ * script.
+ * -# The IVPR register is setup according to the linker script.
+ * -# The R2 and R13 registers are set to pointer to the SDA areas according
+ * to the EABI specification.
+ * -# An early initialization routine @p hwinit0 is invoked, if the symbol is
+ * not defined then an empty default routine is executed (weak symbol).
+ * -# DATA and BSS segments are initialized.
+ * -# A late initialization routine @p hwinit1 is invoked, if the symbol not
+ * defined then an empty default routine is executed (weak symbol).<br>
+ * This late initialization function is also the proper place for a
+ * @a bootloader, if your application requires one.
+ * -# The @p main() function is invoked with the parameters @p argc and @p argv
+ * set to zero.
+ * -# Should the @p main() function return a branch is performed to the weak
+ * symbol @p main_exit. The default code is an endless empty loop.
+ * .
+ * <h2>Expected linker symbols</h2>
+ * The startup code starts at the symbol @p _boot_address and expects the
+ * following symbols to be defined in the linker script:
+ * - @p __ram_end__ RAM end location +1.
+ * - @p __sdata2_start__ small constants data area
+ * - @p __sdata_start__ small variables data area
+ * - @p __romdata_start__ address of the data segment source read only data.
+ * - @p __data_start__ data segment start location.
+ * - @p __data_end__ data segment end location +1.
+ * - @p __bss_start__ BSS start location.
+ * - @p __bss_end__ BSS end location +1.
+ * - @p __ivpr_base__ IVPR register initialization address.
+ * .
+ * @ingroup PPC
+ * @file PPC/crt0.s Startup code.
+ */
|